Academic literature on the topic 'McMurdo Dry Valleys'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'McMurdo Dry Valleys.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "McMurdo Dry Valleys"

1

Wharton, Robert A. "McMurdo Dry Valleys of Antarctica." Eos, Transactions American Geophysical Union 74, no. 46 (1993): 540. http://dx.doi.org/10.1029/93eo00550.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Witherow, Rebecca A., W. Berry Lyons, Nancy A. N. Bertler, Kathleen A. Welch, Paul A. Mayewski, Sharon B. Sneed, Thomas Nylen, Michael J. Handley, and Andrew Fountain. "The aeolian flux of calcium, chloride and nitrate to the McMurdo Dry Valleys landscape: evidence from snow pit analysis." Antarctic Science 18, no. 4 (November 14, 2006): 497–505. http://dx.doi.org/10.1017/s095410200600054x.

Full text
Abstract:
We have determined the flux of calcium, chloride and nitrate to the McMurdo Dry Valleys region by analysing snow pits for their chemical composition and their snow accumulation using multiple records spanning up to 48 years. The fluxes demonstrate patterns related to elevation and proximity to the ocean. In general, there is a strong relationship between the nitrate flux and snow accumulation, indicating that precipitation rates may have a great influence over the nitrogen concentrations in the soils of the valleys. Aeolian dust transport plays an important role in the deposition of some elements (e.g. Ca2+) into the McMurdo Dry Valleys' soils. Because of the antiquity of some of the soil surfaces in the McMurdo Dry Valleys regions, the accumulated atmospheric flux of salts to the soils has important ecological consequences. Although precipitation may be an important mechanism of salt deposition to the McMurdo Dry Valley surfaces, it is poorly understood because of difficulties in measurement and high losses from sublimation.
APA, Harvard, Vancouver, ISO, and other styles
3

Esposito, R. M. M., S. A. Spaulding, D. M. McKnight, B. Van de Vijver, K. Kopalová, D. Lubinski, B. Hall, and T. Whittaker. "Inland diatoms from the McMurdo Dry Valleys and James Ross Island, Antarctica." Botany 86, no. 12 (December 2008): 1378–92. http://dx.doi.org/10.1139/b08-100.

Full text
Abstract:
Diatom taxa present in the inland streams and lakes of the McMurdo Dry Valleys and James Ross Island, Antarctica, are presented in this paper. A total of nine taxa are illustrated, with descriptions of four new species ( Luticola austroatlantica sp. nov., Luticola dolia sp. nov., Luticola laeta sp. nov., Muelleria supra sp. nov.). In the perennially ice-covered lakes of the McMurdo Dry Valleys, diatoms are confined to benthic mats within the photic zone. In streams, diatoms are attached to benthic surfaces and within the microbial mat matrix. One species, L. austroatlantica, is found on James Ross Island, of the southern Atlantic archipelago, and the McMurdo Dry Valleys. The McMurdo Dry Valley populations are at the lower range of the size spectrum for the species. Streams flow for 6–10 weeks during the austral summer, when temperatures and solar radiation allow glacial ice to melt. The diatom flora of the region is characterized by species assemblages favored under harsh conditions, with naviculoid taxa as the dominant group and several major diatom groups conspicuously absent.
APA, Harvard, Vancouver, ISO, and other styles
4

FOUNTAIN, ANDREW G., HASSAN J. BASAGIC, and SPENCER NIEBUHR. "Glaciers in equilibrium, McMurdo Dry Valleys, Antarctica." Journal of Glaciology 62, no. 235 (July 29, 2016): 976–89. http://dx.doi.org/10.1017/jog.2016.86.

Full text
Abstract:
ABSTRACTThe McMurdo Dry Valleys are a cold, dry polar desert and the alpine glaciers therein exhibit small annual and seasonal mass balances, often <±0.06 m w.e. Typically, winter is the accumulation season, but significant snow storms can occur any time of year occasionally making summer the accumulation season. The yearly equilibrium line altitude is poorly correlated with mass balance because the elevation gradient of mass balance on each glacier can change dramatically from year to year. Most likely, winds redistribute the light snowfall disrupting the normal gradient of increasing mass balance with elevation. Reconstructed cumulative mass balance shows that the glaciers have lost <2 m w.e. over the past half century and area changes show minimal retreat. In most cases these changes are less than the uncertainty and the glaciers are considered in equilibrium. Since 2000, however, the glaciers have lost mass despite relatively stable summer air temperatures suggesting a different mechanism in play. Whether this trend is a harbinger of future changes or a temporary excursion is unclear.
APA, Harvard, Vancouver, ISO, and other styles
5

Fountain, Andrew G., Thomas H. Nylen, Andrew Monaghan, Hassan J. Basagic, and David Bromwich. "Snow in the McMurdo Dry Valleys, Antarctica." International Journal of Climatology 30, no. 5 (May 7, 2009): 633–42. http://dx.doi.org/10.1002/joc.1933.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Doran, Peter T., Robert A. Wharton, and W. Berry Lyons. "Paleolimnology of the McMurdo Dry Valleys, Antarctica." Journal of Paleolimnology 10, no. 2 (January 1994): 85–114. http://dx.doi.org/10.1007/bf00682507.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Putkonen, Jaakko, Daniel Morgan, and Greg Balco. "Boulder weathering in McMurdo Dry Valleys, Antarctica." Geomorphology 219 (August 2014): 192–99. http://dx.doi.org/10.1016/j.geomorph.2014.05.012.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Welch, Kathleen A., W. Berry Lyons, Carla Whisner, Christopher B. Gardner, Michael N. Gooseff, Diane M. McKnight, and John C. Priscu. "Spatial variations in the geochemistry of glacial meltwater streams in the Taylor Valley, Antarctica." Antarctic Science 22, no. 6 (December 2010): 662–72. http://dx.doi.org/10.1017/s0954102010000702.

Full text
Abstract:
AbstractStreams in the McMurdo Dry Valleys, Antarctica, flow during the summer melt season (4–12 weeks) when air temperatures are close to the freezing point of water. Because of the low precipitation rates, streams originate from glacial meltwater and flow to closed-basin lakes on the valley floor. Water samples have been collected from the streams in the Dry Valleys since the start of the McMurdo Dry Valleys Long-Term Ecological Research project in 1993 and these have been analysed for ions and nutrient chemistry. Controls such as landscape position, morphology of the channels, and biotic and abiotic processes are thought to influence the stream chemistry. Sea-salt derived ions tend to be higher in streams that are closer to the ocean and those streams that drain the Taylor Glacier in western Taylor Valley. Chemical weathering is an important process influencing stream chemistry throughout the Dry Valleys. Nutrient availability is dependent on landscape age and varies with distance from the coast. The streams in Taylor Valley span a wide range in composition and total dissolved solids and are surprisingly similar to a wide range of much larger temperate and tropical river systems.
APA, Harvard, Vancouver, ISO, and other styles
9

Hall, B. L., G. H. Denton, and B. Overturf. "Glacial Lake Wright, a high-level Antarctic lake during the LGM and early Holocene." Antarctic Science 13, no. 1 (March 2001): 53–60. http://dx.doi.org/10.1017/s0954102001000086.

Full text
Abstract:
We report evidence of a large proglacial lake (Glacial Lake Wright) that existed in Wright Valley in the McMurdo Dry Valleys region of Antarctica at the last glacial maximum (LGM) and in the early Holocene. At its highstands, Glacial Lake Wright would have stretched 50 km and covered c. 210 km2. Chronology for lake-level changes comes from 30 AMS radiocarbon dates of lacustrine algae preserved in deltas, shorelines, and glaciolacustrine deposits that extend up to 480 m above present-day lakes. Emerging evidence suggests that Glacial Lake Wright was only one of a series of large lakes to occupy the McMurdo Dry Valleys and the valleys fronting the Royal Society Range at the LGM. Although the cause of such high lake levels is not well understood, it is believed to relate to cool, dry conditions which produced fewer clouds, less snowfall, and greater amounts of absorbed radiation, leading to increased meltwater production.
APA, Harvard, Vancouver, ISO, and other styles
10

Mager, Sarah, Sean Fitzsimons, Russell Frew, Denis Samyn, and Reginald Lorrain. "Composition and origin of amber ice and its influence on the behaviour of cold glaciers in the McMurdo Dry Valleys, Antarctica." Journal of Glaciology 55, no. 190 (2009): 363–72. http://dx.doi.org/10.3189/002214309788608688.

Full text
Abstract:
AbstractThis paper examines the basal ice sequence of Rhone Glacier, a cold-based glacier in the McMurdo Dry Valleys, Antarctica, using isotopic and solute chemistry data. Three different ice facies are identified: englacial, amber and stratified. The englacial facies is clean, bubbly ice of meteoric origin and is underlain by an amber facies. Amber ice is a characteristic of cold alpine glaciers in the McMurdo Dry Valleys and is distinctive for its high solute concentrations and much higher strain rates compared with the overlying englacial ice and the underlying stratified ice. Analysis of the stratified facies reveals an isotopic signature indicative of melt then refreeze processes and it is most likely associated with apron entrainment at the margin. By contrast, the amber facies has a co-isotopic slope of 8 and plots on a meteoric waterline. The inclusion of impurities in the amber ice reveals prolonged contact with the bed, and its depleted isotopic signature is consistent with ice formed during a cooler period. Comparison of the basal sequence of Rhone Glacier with other cold-based glaciers in the McMurdo Dry Valleys reveals strong similarities between valley-side glaciers (e.g. Meserve and Rhone Glaciers), whereas valley-floor glacier basal sequences (e.g. Suess Glacier) are characterized by structurally complex amalgamations of ice and debris.
APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic "McMurdo Dry Valleys"

1

Yung, Cheuk-man, and 容卓敏. "Molecular ecology of chasmoendolithic environments in Miers Valley, McMurdo Dry Valleys, Antarctica." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B4784999X.

Full text
Abstract:
The McMurdo Dry Valleys comprise some 4,800km2 of ice-free terrain in east Antarctica and this constitutes the coldest and most arid desert on Earth. The ecosystem of the Dry Valleys is characterized by microbial processes since environmental extremes severely limit higher plant and animal life. A major international collaborative research effort co-ordinated by the International Center for Terrestrial Antarctic Research (ICTAR), identified long-term study sites representative of maritime and inland Dry Valleys environments. The maritime site, Miers Valley, has been the subject of intensive multi-disciplinary study in recent years, of which the work in this thesis is a part. Previous studies have identified soil microbial communities and their putative functional roles, but lithic communities have not been previously appreciated. This thesis reports aspects on the biodiversity and ecology of lithic microbial communities in Miers Valley. A survey of terrain revealed extensive weathered granite, but no porous sandstone or limestone rocks more commonly associated with cryptoendolithic communities (those colonizing pore spaces within rock substrates). Granite was extensively colonized (30-100% of available substrate) by chasmoendolithic microorganisms (colonizing cracks and fissures in weathered rock). Visual examination of colonized rocks revealed a distinct zone of biomass 2-5mm below the rock surface, and this was overlain by a weathered and friable matrix of rock. Microscopy revealed a community dominated by diverse cyanobacterial morphotypes, plus other unidentifiable microbes of varied morphology. A quantitative approach to broad-scale community fingerprinting was adopted, utilizing terminal restriction fragment length polymorphism (TRFLP) and sequence based identifications of restriction fragments. The multi-domain approach encompassed Archaea, Bacteria and Eukarya. The results revealed relatively low species richness (0.6-1.8) for each domain with community richness estimates also relatively low (<3). Nonetheless very clear and statistically supported patterns in the occurrence of phylotypes within chasmolithic communities were related to aspect (which strongly affects temperature and moisture availability in Dry Valleys locations). The bacterial assemblages formed two groups (cold-dry south facing slopes and valley floor moraine). The eukaryal assemblages also formed two groups although here the moraine samples grouped with the warmer wetter north facing slope and the cold-dry south facing slope assemblages formed a separate group. The archaeal assemblages displayed no difference within different valley terrain. Extensive sequence based interrogation of community structure using clone libraries revealed a community dominated by cyanobacteria, Actinobacteria, Deinococci and putative lichens. These phyla are all known for their extreme tolerance to desiccation and occurrence in arid landscapes. Phylogenetic analysis revealed that these abundant taxa shared close affiliation with those from other Antarctic refuge niches such as hypoliths and cryptoendoliths. The cyanobacteria were mainly Oscillatoriales, but other genera such as Chroococcidiopsis and Nostoc commonly recovered in hot desert lithic communities were generally absent. The eukaryal community was dominated by chlorophyte algae, whilst the archaeal phylotypes were a diverse collection spanning both euryachaeal and crenarchaeal lineages. Overall the data revealed the chasmoendolithic community in Miers Valley was widespread and with relatively restricted diversity. The selection pressures related to topology of the valley have resulted in different community structure within the valley.
published_or_final_version
Biological Sciences
Master
Master of Philosophy
APA, Harvard, Vancouver, ISO, and other styles
2

Deuerling, Kelly M. "Aeolian Sediments of the McMurdo Dry Valleys, Antarctica." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1290524862.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Lapalme, Caitlin. "Near-Surface Ground Ice Conditions In University Valley, McMurdo Dry Valleys of Antarctica." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33412.

Full text
Abstract:
This study aims to quantify ground ice content and describe the cryostructures and sediment in 15 ice-bearing permafrost cores collected from nine sand-wedge polygons in University Valley. The objectives were reached through laboratory measurements and computed tomodensitometric (CT) scanned image analysis of the permafrost cores. The soils in the valley were predominantly medium-sand. Four types of cryostructures were present in the cores: structureless, suspended, crustal and porphyritic. Excess ice content ranged from 0 to 93%, gravimetric water content ranged from 13 to 1881% and volumetric ice content varied from 28 to 93%. Median excess ice, volumetric ice and gravimetric water contents significantly increased in the top 20 cm of the cores taken from the polygon shoulders with increasing distance from University Glacier. Ground ice was preferentially stored in the centre of the investigated polygons where the ground surface remains cryotic throughout the year. Conversely, higher ground ice contents were measured in the shoulders of the investigated polygon where the ground surface is seasonally non-cryotic. CT-scanned images were shown to reasonably assess the distribution and presence of excess ice in permafrost cores taken from a cold and hyper-arid environment. The results of this thesis provide the first cryostratigraphic study in the McMurdo Dry Valleys of Antarctica.
APA, Harvard, Vancouver, ISO, and other styles
4

Hoffman, Matthew James. "Spatial and Temporal Variability of Glacier Melt in the McMurdo Dry Valleys, Antarctica." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/744.

Full text
Abstract:
In the McMurdo Dry Valleys, Victoria Land, East Antarctica, melting of glacial ice is the primary source of water to streams, lakes, and associated ecosystems. To better understand meltwater production, three hypotheses are tested: 1) that small changes in the surface energy balance on these glaciers will result in large changes in melt, 2) that subsurface melt does not contribute significantly to runoff, and 3) that melt from 25-m high terminal cliffs is the dominant source of baseflow during cold periods. These hypotheses were investigated using a surface energy balance model applied to the glaciers of Taylor Valley using 14 years of meteorological data and calibrated to ablation measurements. Inclusion of transmission of solar radiation into the ice through a source term in a one-dimensional heat transfer equation was necessary to accurately model summer ablation and ice temperatures. Results showed good correspondence between calculated and measured ablation and ice temperatures over the 14 years using both daily and hourly time steps, but an hourly time step allowed resolution of short duration melt events and melt within the upper 15 cm of the ice. Resolution of short duration melt events was not important for properly resolving seasonal ablation totals. Across the smooth surfaces of the glaciers, ablation was dominated by sublimation and melting was rare. Above freezing air temperatures did not necessarily result in melt, and low wind speed was important for melt initiation. According to the model, subsurface melt between 5 and 15 cm depth was extensive and lasted for up to six weeks in some summers. The model was better able to predict ablation if some subsurface melt was assumed to drain, lowering ice density, consistent with observations of a low density weathering crust that forms over the course of the summer on Dry Valley glaciers. In extreme summers, drainage of subsurface melt may have contributed up to half of the observed surface lowering through reduction of ice density and possibly through collapse of highly weathered ice. When applied spatially, the model successfully predicted proglacial streamflow at seasonal and daily time scales. This was despite omitting a routing scheme, and instead assuming that all melt generated exits the glacier on the same day, suggesting refreezing is not substantial. Including subsurface melt as runoff improved predictions of runoff volume and timing, particularly for the recession of large flood peaks. Because overland flow was rarely observed over much of these glaciers, these model results suggest that runoff may be predominantly transported beneath the surface in a partially melted permeable layer of weathered ice. According to the model, topographic basins, particularly the low albedo basin floors, played a prominent role in runoff production. Smooth glacier surfaces exhibited low melt rates, but were important during high melt conditions due to their large surface area. Estimated runoff contributions from cliffs and cryoconite holes was somewhat smaller than suggested in previous studies. Spatial and temporal variability in albedo due to snow and debris played a dominant role in flow variations between streams and seasons. In general, the model supported the existing assumption that snowmelt is insignificant, but in extreme melt years snowmelt in the accumulation area may contribute significantly to runoff in some locations.
APA, Harvard, Vancouver, ISO, and other styles
5

Sabacka, Marie. "Wind as an ecological factor in the McMurdo Dry Valleys, Antarctica." Diss., Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/sabacka/SabackaM0512.pdf.

Full text
Abstract:
The aim of this work was to investigate the role of wind on the ecology of the McMurdo Dry Valleys in Antarctica (MDV), one of the coldest and driest deserts on Earth. The MDV landscape consists of a mosaic of permanently ice-covered lakes, ephemeral streams, exposed soils, and glaciers, all of which contain habitats dominated by microorganisms. Data on wind-driven flux of sediments and associated organic matter were collected using passive aeolian traps and dynamic mass erosion particle counters to investigate the timing, direction and magnitude of aeolian sediment transport. Combination of genomic techniques and phenotypical fingerprinting (pigment analysis) was used to examine microbial diversity over a wide variety of wind-eroded habitats across the MDV landscape to elucidate the role of wind dispersal on the contemporary distribution of microorganisms across the MDVs. Sediment entrainment occurs predominantly within 20 cm of the ground surface and has character of saltation bursts that occupy <3% of the total time within a year. The high-energy winter fo��hn winds uplift sediments in the upper parts of the MDVs and transport them down-valley where they are deposited onto the surface of perennially ice-covered lakes and surrounding soils. The sediment that enters the water column of the lakes does not provide a significant source of organic carbon for bacterioplankton communities compared to the in situ production by phytoplankton but can be a source of new microbial propagules. The aeolian material is low in organic matter (<1% dw) but is composed of a relatively large numbers of cyanobacterial taxa (~20 OTUs) that can be found in all other MDV habitats. In conclusion, wind distributes microorganisms across the MDV landscape but local environment selects for specific taxa. Predicted climate warming will increase the importance of wind transport, which will affect nutrient cycling and connectivity among MDV ecosystem components. 'Co-authored by John C. Priscu, Hassan J. Basagic, Andrew G. Fountain, Diana H. Wall, Ross A. Virginia and Mark C. Greenwood, J. E. Barrett, Diane McKnight and Alexander B. Michaud.'
APA, Harvard, Vancouver, ISO, and other styles
6

Power, Sarah Nicole. "Microbial Mat Abundance and Activity in the McMurdo Dry Valleys, Antarctica." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/101078.

Full text
Abstract:
Primary productivity is a fundamental ecological process and an important measure of ecosystem response to environmental change. Currently, there is a considerable lapse in our understanding of primary productivity in hot and cold deserts, due to the difficulty of measuring production in cryptogam vegetation. However, remote sensing can provide long-term, spatially-extensive estimates of primary production and are particularly well suited to remote environments, such as in the McMurdo Dry Valleys (MDV) of Antarctica, where cyanobacterial communities are the main drivers of primary production. These microbial communities form multi-layered sheets (i.e., microbial mats) on top of desert pavement. The cryptic nature of these communities, their often patchy spatial distribution, and their ability to survive desiccation make assessments of productivity challenging. I used field-based surveys of microbial mat biomass and pigment chemistry in conjunction with analyses of multispectral satellite data to examine the distribution and activity of microbial mats. This is the first satellite-derived estimate of microbial mat biomass for Antarctic microbial mat communities. I show strong correlations between multispectral satellite data (i.e., NDVI) and ground based measurements of microbial mats, including ground cover, biomass, and pigment chemistry. Elemental (C, N) and isotopic composition (15N, 13C) of microbial mats show that they have significant effects on biogeochemical cycling in the soil and sediment of this region where they occur. Using these relationships, I developed a statistical model that estimates biomass (kg of C) in selected wetlands in the Lake Fryxell Basin, Antarctica. Overall, this research demonstrates the importance of terrestrial microbial mats on C and N cycling in the McMurdo Dry Valleys, Antarctica.
Master of Science
APA, Harvard, Vancouver, ISO, and other styles
7

Ramsey, Meridith Ann. "OSL Dating of High-Elevation Alluvial Sediments: McMurdo Dry Valleys, Antarctica." Thesis, North Dakota State University, 2015. https://hdl.handle.net/10365/27578.

Full text
Abstract:
High-elevation alluvial fans in the McMurdo Dry Valleys are a record of short-term, occasional melting events along the margins of the East Antarctic Ice Sheet. Sediment samples were dated from five fans using Optically Stimulated Luminescence (OSL) dating. OSL dates the time since quartz grains were last exposed to sunlight; all sample preparation takes place in a dark room. Thirteen samples were dated for this thesis, the ages were stratigraphically consistent and ranged from 1.1 ka to 105.9 ka. Clusters of fan activity occurred between 1.1 and 3.1 ka and 8.1 and 11.1 ka. The melting events appear to be linked to insolation, with periods of fan activity occurring usually at times of increased mean annual insolation. The alluvial fans show promise as a possible archive for climate proxies in this region of Antarctica.
APA, Harvard, Vancouver, ISO, and other styles
8

Steinhoff, Daniel Frederick. "Dynamics and Variability of Foehn Winds in the McMurdo Dry Valleys Antarctica." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306437539.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Barbier, Beatrice A. "Investigating the Biodiversity of Microbial Communities in the McMurdo Dry Valleys, Antarctica: An Inter-Valley Comparison Study." The University of Waikato, 2009. http://hdl.handle.net/10289/2775.

Full text
Abstract:
Extreme environments provide a unique source of often highly adapted and tolerant organisms. Research on organisms in these habitats has led to the discovery of novel and useful compounds and may assist in understanding the impact of global change on biodiversity. The Dry Valleys of Eastern Antarctica are vast, ice-free regions believed to be the coldest, driest desert on Earth. Despite these harsh conditions, there is an increasing amount of evidence demonstrating that the soil ecosystems of the Dry Valleys sustain a wide diversity of microorganisms. The research presented is an inter-valley comparison study which aims to scrutinize microbial communities and environmental factors driving their distribution in the Dry Valleys. Automated ribosomal intergenic spacer analysis (ARISA) was used to provide a snapshot of bacterial and cyanobacterial communities living in the mineral sands in Miers Valley, Beacon Valley, Upper Wright Valley and at Battleship Promontory. Rigorous analysis of physico-chemical differences between the soils of these four valleys was undertaken in hope to understand the environmental parameters driving the distribution and biodiversity of microbial communities present. Multivariate statistical analysis and ordination of ARISA and physico-chemical data revealed that bacterial communities from each valley form distinctive clusters. Conversely, cyanobacterial communities showed less diversity and a more even distribution between valleys.
APA, Harvard, Vancouver, ISO, and other styles
10

Zamora, Felix Jacob. "Measuring and Modeling Evolution of Cryoconite Holes in the McMurdo Dry Valleys, Antarctica." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4706.

Full text
Abstract:
Cryoconite holes are vertical columns of meltwater within the shallow subsurface of glaciers. In the McMurdo Dry Valleys (MDV) of Antarctica cryoconite holes are a source of meltwater and harbor microbial communities in an otherwise arid environment with low biologic activity. The holes form as sediments on the ice surface, which are darker than the surrounding ice, are preferentially heated by solar radiation. The warm sediments melt the underlying ice and migrate downwards. An ice lid forms, isolating them from the below-freezing atmosphere enabling them to remain thawed. In this study, field observations, laboratory experiments, and numerical modeling are used to characterize the fundamental variables controlling cryoconite hole development. Field and laboratory results show that solar radiation drives cryoconite hole melting by controlling the energy available to the cryoconite and to warm the surrounding ice. Holes deepen further in warmer ice. Laboratory results show that at temperatures of -10º C at least 405 (W m-2) are needed to warm the cryoconite sufficiently to melt surrounding ice. Numerical modeling shows that increased radiation flux into the subsurface and warmer air temperatures cause cryoconite to descend deeper and the meltwater-filled holes to enlarge, while increased surface ablation decreases their average depth. Cryoconite holes thaw sooner and refreeze later when the optical properties of the ice facilitate greater radiation transmission. Cryoconite warms the ice significantly more than ice without cryoconite. Within the melt-filled hole, the heat capacity of the water keeps the surrounding ice warm for several weeks after the cryoconite-free ice has cooled. The cryoconite itself is last to completely freeze.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "McMurdo Dry Valleys"

1

Priscu, C., ed. Ecosystem Dynamics in a Polar Desert: The McMurdo Dry Valleys, Antarctica. Washington, D. C.: American Geophysical Union, 1998. http://dx.doi.org/10.1029/ar072.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Charles, Priscu John, ed. Ecosystem dynamics in a polar desert: The McMurdo Dry Valleys, Antarctica. Washington, D.C: American Geophysical Union, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Priscu, John C. Ecosystem Dynamics in a Polar Desert: The McMurdo Dry Valleys, Antarctica (Antarctic Research Series). American Geophysical Union, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "McMurdo Dry Valleys"

1

Dana, Gayle L., Robert A. Wharton, and Ralph A. Dubayah. "Solar Radiation in the Mcmurdo Dry Valleys, Antarctica." In Ecosystem Dynamics in a Polar Desert: the Mcmurdo Dry Valleys, Antarctica, 39–64. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar072p0039.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Spigel, Robert H., and John C. Priscu. "Physical Limnology of the Mcmurdo Dry Valleys Lakes." In Ecosystem Dynamics in a Polar Desert: the Mcmurdo Dry Valleys, Antarctica, 153–87. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar072p0153.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Bockheim, James G., and Malcolm McLeod. "Soils of Central Victoria Land, the McMurdo Dry Valleys." In World Soils Book Series, 117–48. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-05497-1_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Campbell, Iain B., Graeme G. C. Claridge, David I. Campbell, and Megan R. Balks. "The Soil Environment of the Mcmurdo Dry Valleys, Antarctica." In Ecosystem Dynamics in a Polar Desert: the Mcmurdo Dry Valleys, Antarctica, 297–322. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar072p0297.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Howard-Williams, Clive, Anne-Maree Schwarz, Ian Hawes, and John C. Priscu. "Optical Properties of the Mcmurdo Dry Valley Lakes, Antarctica." In Ecosystem Dynamics in a Polar Desert: the Mcmurdo Dry Valleys, Antarctica, 189–203. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar072p0189.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Moorhead, Daryl L., and John C. Priscu. "The Mcmurdo Dry Valley Ecosystem: Organization, Controls, and Linkages." In Ecosystem Dynamics in a Polar Desert: the Mcmurdo Dry Valleys, Antarctica, 351–63. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar072p0351.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Fountain, Andrew G., Gayle L. Dana, Karen J. Lewis, Bruce H. Vaughn, and Diane H. Mcknight. "Glaciers of the Mcmurdo Dry Valleys, Southern Victoria Land, Antarctica." In Ecosystem Dynamics in a Polar Desert: the Mcmurdo Dry Valleys, Antarctica, 65–75. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar072p0065.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Moorhead, Daryl L., Diane M. Mcknight, and Cathy M. Tate. "Modeling Nitrogen Transformations in Dry Valley Streams, Antarctica." In Ecosystem Dynamics in a Polar Desert: the Mcmurdo Dry Valleys, Antarctica, 141–51. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar072p0141.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Hawes, Ian, and Clive Howard-Williams. "Primary Production Processes in Streams of the Mcmurdo Dry Valleys, Antarctica." In Ecosystem Dynamics in a Polar Desert: the Mcmurdo Dry Valleys, Antarctica, 129–40. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar072p0129.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Freckman, Diana Wall, and Ross A. Virginia. "Soil Biodiversity and Community Structure in the Mcmurdo Dry Valleys, Antarctica." In Ecosystem Dynamics in a Polar Desert: the Mcmurdo Dry Valleys, Antarctica, 323–35. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar072p0323.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "McMurdo Dry Valleys"

1

Fountain, Andrew G., Joseph Levy, Maciej K. Obryk, Michael Gooseff, Dave Van Horn, Craig Glennie, Juan Fernandez Diaz, and Berry Lyons. "DRAMATIC TOPOGRAPHIC CHANGES IN THE MCMURDO DRY VALLEYS, ANTARCTICA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-281557.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Castendyk, Devin, Maciej K. Obryk, Sasha Z. Leidman, Michael Gooseff, and Ian Hawes. "THE IMPACT OF CLIMATE CHANGE ON LAKE VANDA, MCMURDO DRY VALLEYS, ANTARCTICA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-279170.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Swanger, Kate M., Joerg M. Schaefer, and Gisela Winckler. "ALPINE GLACIER ADVANCE DURING MIS 11 IN THE MCMURDO DRY VALLEYS, ANTARCTICA." In 51st Annual Northeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016ne-271625.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Blatter, D., K. Key, and A. Ray. "Bayesian Inversion of Transient Airborne EM Data from the McMurdo Dry Valleys, Antarctica." In Second European Airborne Electromagnetics Conference. Netherlands: EAGE Publications BV, 2017. http://dx.doi.org/10.3997/2214-4609.201702173.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Diaz, Melisa A., Susan A. Welch, Kathleen A. Welch, Alia L. Khan, Byron J. Adams, S. Craig Cary, Diane M. McKnight, and W. Berry Lyons. "PRELIMINARY CHARACTERIZATION OF WIND-BLOWN DUST FROM THE MCMURDO DRY VALLEYS OF ANTARCTICA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-285359.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Diaz, Melisa A., Byron J. Adams, Alia L. Khan, Kathleen A. Welch, Susan A. Welch, Diane M. McKnight, S. Craig Cary, and W. Berry Lyons. "SOLUBLE AND BULK GEOCHEMICAL ANALYSIS OF AEOLIAN MATERIAL FROM THE MCMURDO DRY VALLEYS, ANTARCTICA." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-300822.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Levy, Joseph. "WATER TRACK HYDROPATTERN IN THE MCMURDO DRY VALLEYS, ANTARCTICA: CONTRASTING VIEWS FROM SPACE AND FROM THE SUBSURFACE." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-358320.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Godfrey, Myfanwy J., David C. Nobes, Michele T. Bannister, and Ronald S. Sletten. "Time-Lapse electrical resistivity and ground penetrating radar imaging of young polygonal patterned ground in Victoria Valley, McMurdo Dry Valleys, Antarctica." In SEG Technical Program Expanded Abstracts 2019. Society of Exploration Geophysicists, 2019. http://dx.doi.org/10.1190/segam2019-3211851.1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Tremel, Christina J., Joseph Levy, and Andrew G. Fountain. "MORPHOLOGICAL AND TOPOGRAPHIC CHARACTERISTICS OF MCMURDO DRY VALLEYS PALEOLAKE DEPOSITS: USING LIDAR TO ASSESS LGM-AGE HYDROLOGICAL PROCESSES." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-281290.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Currier, Ryan, and Tim P. Flood. "MASSIVE, RAPID MELTING OF THE CRUST AND THE GENERATION OF DISEQUILIBRIUM AND EQUILIBRIUM MELTING FACIES, MCMURDO DRY VALLEYS, ANTARCTICA." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-323684.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "McMurdo Dry Valleys"

1

Hoffman, Matthew. Spatial and Temporal Variability of Glacier Melt in the McMurdo Dry Valleys, Antarctica. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.744.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Zamora, Felix. Measuring and Modeling Evolution of Cryoconite Holes in the McMurdo Dry Valleys, Antarctica. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6590.

Full text
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography