Log in

Relevant bibliographies by topics / Ocean bottom / Journal articles

Journal articles on the topic 'Ocean bottom'

To see the other types of publications on this topic, follow the link: Ocean bottom.

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Ocean bottom.'

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.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Dolgikh, Grigory, Stanislav Dolgikh, and Aleksandr Plotnikov. "Ocean-Bottom Laser Seismograph." Sensors 22, no. 7 (March 25, 2022): 2527. http://dx.doi.org/10.3390/s22072527.

Full text

Abstract:

This paper describes an ocean-bottom laser seismograph, based on the modified laser meter of hydrosphere pressure variations, and designed to record vertical bottom displacements at the place of its location. Its measuring accuracy is about 1 nm, limited by the stability of the laser emission, which can be improved by using more advanced lasers. The purpose of this instrument is to measure the displacements of the seabed’s upper layer in the low-frequency sonic and infrasonic ranges. Theoretically, it can operate in the frequency range from 0 (conditionally) to 1000 Hz; the upper limit is determined by the operating speed of the digital registration system. We demonstrated the capabilities of the ocean-bottom laser seismograph while registering vertical bottom displacements caused by sea wind waves and lower frequency processes—seiches, i.e., eigenoscillations of the bay in which the instrument was installed. Comparison of experimental data of the bottom laser seismograph with the data of the laser hydrosphere pressure variations meter and the velocimeter—installed in close proximity—shows good efficiency of the instrument.

APA, Harvard, Vancouver, ISO, and other styles

2

Kawaguchi, So, Robbie Kilpatrick, Lisa Roberts, Robert A. King, and Stephen Nicol. "Ocean-bottom krill sex." Journal of Plankton Research 33, no. 7 (February 20, 2011): 1134–38. http://dx.doi.org/10.1093/plankt/fbr006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Suetsugu, Daisuke, and Hajime Shiobara. "Broadband Ocean-Bottom Seismology." Annual Review of Earth and Planetary Sciences 42, no. 1 (May 30, 2014): 27–43. http://dx.doi.org/10.1146/annurev-earth-060313-054818.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Hicok, Bob. "Bottom of the Ocean." Missouri Review 24, no. 2 (2001): 174–75. http://dx.doi.org/10.1353/mis.2001.0105.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Denney, Dennis. "Positioning Ocean-Bottom Seismic Cables." Journal of Petroleum Technology 52, no. 01 (January 1, 2000): 22–24. http://dx.doi.org/10.2118/0100-0022-jpt.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Harris, D. W., and F. K. Duennebier. "Powering cabled ocean-bottom observatories." IEEE Journal of Oceanic Engineering 27, no. 2 (April 2002): 202–11. http://dx.doi.org/10.1109/joe.2002.1002474.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Duennebier, Fred K., and George H. Sutton. "Why bury ocean bottom seismometers?" Geochemistry, Geophysics, Geosystems 8, no. 2 (February 2007): n/a. http://dx.doi.org/10.1029/2006gc001428.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

de Kok, Rob. "Directions in ocean-bottom surveying." Leading Edge 31, no. 4 (April 2012): 415–28. http://dx.doi.org/10.1190/tle31040415.1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Jacobson, R. S., L. M. Dorman, G. M. Purdy, A. Schultz, and S. C. Solomon. "Ocean bottom seismometer facilities available." Eos, Transactions American Geophysical Union 72, no. 46 (1991): 506. http://dx.doi.org/10.1029/90eo00366.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Kutoglu, Hakan S., and Kazimierz Becek. "Analysis of Ocean Bottom Pressure Anomalies and Seismic Activities in the MedRidge Zone." Remote Sensing 13, no. 7 (March 24, 2021): 1242. http://dx.doi.org/10.3390/rs13071242.

Full text

Abstract:

The Mediterranean Ridge accretionary complex (MAC) is a product of the convergence of Africa–Europe–Aegean plates. As a result, the region exhibits a continuous mass change (horizontal/vertical movements) that generates earthquakes. Over the last 50 years, approximately 430 earthquakes with M ≥ 5, including 36 M ≥ 6 earthquakes, have been recorded in the region. This study aims to link the ocean bottom deformations manifested through ocean bottom pressure variations with the earthquakes’ time series. To this end, we investigated the time series of the ocean bottom pressure (OBP) anomalies derived from the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) satellite missions. The OBP time series comprises a decreasing trend in addition to 1.02, 1.52, 4.27, and 10.66-year periodic components, which can be explained by atmosphere, oceans, and hydrosphere (AOH) processes, the Earth’s pole movement, solar activity, and core–mantle coupling. It can be inferred from the results that the OBP anomalies time series/mass change is linked to a rising trend and periods in the earthquakes’ energy time series. Based on this preliminary work, ocean-bottom pressure variation appears to be a promising lead for further research.

APA, Harvard, Vancouver, ISO, and other styles

11

Boebel, O., M. Busack, E. R. Flueh, V. Gouretski, H. Rohr, A. Macrander, A. Krabbenhoeft, M. Motz, and T. Radtke. "The GITEWS ocean bottom sensor packages." Natural Hazards and Earth System Sciences 10, no. 8 (August 31, 2010): 1759–80. http://dx.doi.org/10.5194/nhess-10-1759-2010.

Full text

Abstract:

Abstract. The German-Indonesian Tsunami Early Warning System (GITEWS) aims at reducing the risks posed by events such as the 26 December 2004 Indian Ocean tsunami. To minimize the lead time for tsunami alerts, to avoid false alarms, and to accurately predict tsunami wave heights, real-time observations of ocean bottom pressure from the deep ocean are required. As part of the GITEWS infrastructure, the parallel development of two ocean bottom sensor packages, PACT (Pressure based Acoustically Coupled Tsunameter) and OBU (Ocean Bottom Unit), was initiated. The sensor package requirements included bidirectional acoustic links between the bottom sensor packages and the hosting surface buoys, which are moored nearby. Furthermore, compatibility between these sensor systems and the overall GITEWS data-flow structure and command hierarchy was mandatory. While PACT aims at providing highly reliable, long term bottom pressure data only, OBU is based on ocean bottom seismometers to concurrently record sea-floor motion, necessitating highest data rates. This paper presents the technical design of PACT, OBU and the HydroAcoustic Modem (HAM.node) which is used by both systems, along with first results from instrument deployments off Indonesia.

APA, Harvard, Vancouver, ISO, and other styles

12

Corela, Carlos, Afonso Loureiro, José Luis Duarte, Luis Matias, Tiago Rebelo, and Tiago Bartolomeu. "The effect of deep ocean currents on ocean- bottom seismometers records." Natural Hazards and Earth System Sciences 23, no. 4 (April 20, 2023): 1433–51. http://dx.doi.org/10.5194/nhess-23-1433-2023.

Full text

Abstract:

Abstract. Ocean-bottom seismometers (OBSs) are usually deployed for seismological investigations, but these objectives are impaired by noise resulting from the ocean environment. We split the OBS-recorded seismic noise into three bands: short periods, microseisms and long periods, also known as tilt noise. We show that bottom currents control the first and third bands, but these are not always a function of the tidal forcing. Instead, we suggest that the ocean bottom has a flow regime resulting from two possible contributions: the permanent low-frequency bottom current and the tidal current. The recorded noise displays the balance between these currents along the entire tidal cycle, between neap and spring tides. In the short-period noise band, the ocean current generates harmonic tremors corrupting seismic dataset records. We show that, in the investigated cases, the harmonic tremors result from the interaction between the ocean current and mechanical elements of the OBS that are not essential during the sea bottom recording and thus have no geological origin. The data from a new broadband OBS type, designed and built at Instituto Dom Luiz (IDL – University of Lisbon)/Centre of Engineering and Product Development (CEIIA), hiding non-essential components from the current flow, show how utmost harmonic noise can be eliminated.

APA, Harvard, Vancouver, ISO, and other styles

13

Walters, A. P., J. M. Didoszak, and Y. W. Kwon. "Explicit Modeling of Solid Ocean Floor in Shallow Underwater Explosions." Shock and Vibration 20, no. 1 (2013): 189–97. http://dx.doi.org/10.1155/2013/901042.

Full text

Abstract:

Current practices for modeling the ocean floor in underwater explosion simulations call for application of an inviscid fluid with soil properties. A method for modeling the ocean floor as a Lagrangian solid, vice an Eulerian fluid, was developed in order to determine its effects on underwater explosions in shallow water using the DYSMAS solver. The Lagrangian solid bottom model utilized transmitting boundary segments, exterior nodal forces acting as constraints, and the application of prestress to minimize any distortions into the fluid domain. For simplicity, elastic materials were used in this current effort, though multiple constitutive soil models can be applied to improve the overall accuracy of the model. Even though this method is unable to account for soil cratering effects, it does however provide the distinct advantage of modeling contoured ocean floors such as dredged channels and sloped bottoms absent in Eulerian formulations. The study conducted here showed significant differences among the initial bottom reflections for the different solid bottom contours that were modeled. The most important bottom contour effect was the distortion to the gas bubble and its associated first pulse timing. In addition to its utility in bottom modeling, implementation of the non-reflecting boundary along with realistic material models can be used to drastically reduce the size of current fluid domains.

APA, Harvard, Vancouver, ISO, and other styles

14

SUETSUGU, Daisuke, and Hajime SHIOBARA. "Broadband Ocean Bottom Seismology in Japan." Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 73 (June 5, 2020): 37–63. http://dx.doi.org/10.4294/zisin.2019-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

T.Chen, Allen, Yosio Nanamura, and Li-Wei Wu. "Ocean Bottom Seismograph:Instrumentation and Experimental Technique." Terrestrial, Atmospheric and Oceanic Sciences 5, no. 1 (1994): 109. http://dx.doi.org/10.3319/tao.1994.5.1.109(o).

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Willoughby, David F., John A. Orcutt, and David Horwitt. "A microprocessor-based ocean-bottom seismometer." Bulletin of the Seismological Society of America 83, no. 1 (February 1, 1993): 190–217. http://dx.doi.org/10.1785/bssa0830010190.

Full text

Abstract:

Abstract For over 12 years, the Scripps Institution of Oceanography has operated a fleet of microprocessor-based ocean-bottom seismometers. These instruments free-fall to the seafloor and release their anchors and rise to the surface either at preset times or on receipt of an acoustic command. The instruments are contained in a single spherical pressure case and include geophones with a 1-Hz natural period, and differential pressure gauges responsive to acoustic signals between 0.003 and 30 Hz. Recent improvements described in detail here include the implementation of a C-44 bus 80C88 microprocessor and cassette recorders capable of storing up to 10 days of data digitized at 128 samples/sec, or 40 days at 32 samples/sec. In addition, tiltmeters have been installed in the instruments. Serial links to the processor and release timers provide for instrument checkout and the setting of time and data parameters from outside the pressure case. A portable laboratory also described here is used to prepare the instruments for deployment at sea.

APA, Harvard, Vancouver, ISO, and other styles

17

Denney, Dennis. "Ocean-Bottom-Seismic Survey at Valhall." Journal of Petroleum Technology 52, no. 01 (January 1, 2000): 26. http://dx.doi.org/10.2118/0100-0026-jpt.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Carpenter, Chris. "Blended-Source Ocean-Bottom Seismic Acquisition." Journal of Petroleum Technology 67, no. 03 (March 1, 2015): 137–40. http://dx.doi.org/10.2118/0315-0137-jpt.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Collins, Michael D., W. A. Kuperman, and Henrik Schmidt. "Nonlinear inversion for ocean‐bottom properties." Journal of the Acoustical Society of America 92, no. 5 (November 1992): 2770–83. http://dx.doi.org/10.1121/1.404394.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Frisk, George V. "Inverse methods in ocean bottom acoustics." Journal of the Acoustical Society of America 82, S1 (November 1987): S110. http://dx.doi.org/10.1121/1.2024577.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Casasanta, Lorenzo, and Samuel H. Gray. "PS imaging of ocean-bottom data." Leading Edge 34, no. 4 (April 2015): 414–20. http://dx.doi.org/10.1190/tle34040414.1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

de Kok, Rob. "The ocean-bottom recording trade-off." Leading Edge 25, no. 8 (August 2006): 928–33. http://dx.doi.org/10.1190/1.2335157.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Duennebier, Fred K., and George H. Sutton. "Fidelity of ocean bottom seismic observations." Marine Geophysical Researches 17, no. 6 (December 1995): 535–55. http://dx.doi.org/10.1007/bf01204343.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Kazarova, A. Yu, L. Ya Lyubavin, and A. G. Nechaev. "Interferential algorithm for ocean bottom diagnostics." Radiophysics and Quantum Electronics 38, no. 3-4 (1996): 130–32. http://dx.doi.org/10.1007/bf01037884.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Schoepf, Victor. "4666338 Ocean bottom seismometer release mechanism." Deep Sea Research Part B. Oceanographic Literature Review 34, no. 11 (January 1987): 1015–16. http://dx.doi.org/10.1016/0198-0254(87)91152-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Sauter, Allan M., and Leroy M. Dorman. "Instrument calibration of ocean bottom seismographs." Marine Geophysical Researches 8, no. 3 (1986): 265–75. http://dx.doi.org/10.1007/bf00305486.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

SHAO, Anmin, Yuyun ZHANG, and Fengwen ZHAO. "An Ocean Bottom Seismic Data Recorder." Chinese Journal of Geophysics 46, no. 2 (March 2003): 311–17. http://dx.doi.org/10.1002/cjg2.346.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Sutton, George H., and Frederick K. Duennebier. "Optimum design of Ocean bottom seismometers." Marine Geophysical Researches 9, no. 1 (March 1987): 47–65. http://dx.doi.org/10.1007/bf00338250.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Schlitzer, Reiner. "Assimilation of Radiocarbon and Chlorofluorocarbon Data to Constrain Deep and Bottom Water Transports in the World Ocean." Journal of Physical Oceanography 37, no. 2 (February 1, 2007): 259–76. http://dx.doi.org/10.1175/jpo3011.1.

Full text

Abstract:

Abstract A coarse-resolution global model with time-invariant circulation is fitted to hydrographic and tracer data by means of the adjoint method. Radiocarbon and chlorofluorocarbon (CFC-11 and CFC-12) data are included to constrain deep and bottom water transport rates and spreading pathways as well as the strength of the global overturning circulation. It is shown that realistic global ocean distributions of hydrographic parameters and tracers can be obtained simultaneously. The model correctly reproduces the deep ocean radiocarbon field and the concentrations gradients between different basins. The spreading of CFC plumes in the deep and bottom waters is simulated in a realistic way, and the spatial extent as well as the temporal evolution of these plumes agrees well with observations. Radiocarbon and CFC observations place upper bounds on the northward transports of Antarctic Bottom Water (AABW) into the Pacific, Atlantic, and Indian Oceans. Long-term mean AABW transports larger than 5 Sv (Sv ≡ 106 m3 s−1) through the Vema and Hunter Channels in the South Atlantic and net AABW transports across 30°S into the Indian Ocean larger than 10 Sv are found to be incompatible with CFC data. The rates of equatorward deep and bottom water transports from the North Atlantic and Southern Ocean are of similar magnitude (15.7 Sv at 50°N and 17.9 Sv at 50°S). Deep and bottom water formation in the Southern Ocean occurs at multiple sites around the Antarctic continent and is not confined to the Weddell Sea. A CFC forecast based on the assumption of unchanged abyssal transports shows that by 2030 the entire deep west Atlantic exhibits CFC-11 concentrations larger than 0.1 pmol kg−1, while most of the deep Indian and Pacific Oceans remain CFC free. By 2020 the predicted CFC concentrations in the deep western boundary current (DWBC) in the North Atlantic exceed surface water concentrations and the vertical CFC gradients start to reverse.

APA, Harvard, Vancouver, ISO, and other styles

30

Heuzé, Céline, Karen J. Heywood, David P. Stevens, and Jeff K. Ridley. "Changes in Global Ocean Bottom Properties and Volume Transports in CMIP5 Models under Climate Change Scenarios*." Journal of Climate 28, no. 8 (April 7, 2015): 2917–44. http://dx.doi.org/10.1175/jcli-d-14-00381.1.

Full text

Abstract:

Abstract Changes in bottom temperature, salinity, and density in the global ocean by 2100 for CMIP5 climate models are investigated for the climate change scenarios RCP4.5 and RCP8.5. The mean of 24 models shows a decrease in density in all deep basins, except the North Atlantic, which becomes denser. The individual model responses to climate change forcing are more complex: regarding temperature, the 24 models predict a warming of the bottom layer of the global ocean; in salinity, there is less agreement regarding the sign of the change, especially in the Southern Ocean. The magnitude and equatorward extent of these changes also vary strongly among models. The changes in properties can be linked with changes in the mean transport of key water masses. The Atlantic meridional overturning circulation weakens in most models and is directly linked to changes in bottom density in the North Atlantic. These changes are the result of the intrusion of modified Antarctic Bottom Water, made possible by the decrease in North Atlantic Deep Water formation. In the Indian, Pacific, and South Atlantic Oceans, changes in bottom density are congruent with the weakening in Antarctic Bottom Water transport through these basins. The authors argue that the greater the 1986–2005 meridional transports, the more changes have propagated equatorward by 2100. However, strong decreases in density over 100 yr of climate change cause a weakening of the transports. The speed at which these property changes reach the deep basins is critical for a correct assessment of the heat storage capacity of the oceans as well as for predictions of future sea level rise.

APA, Harvard, Vancouver, ISO, and other styles

31

Busby, Roswell F. "Ocean Surveying from Manned Submersibles." Marine Technology Society Journal 40, no. 2 (May 1, 2006): 16–29. http://dx.doi.org/10.4031/002533206787353358.

Full text

Abstract:

The performance of the bathyscaphes and second generation manned submersibles has generated considerable speculation concerning the merits of these platforms as undersea surveying tools. Although a wide variety of tasks have been successfully performed, the manned submersible is still too new a tool to have firmly established its role in oceanographic/engineering surveys. Undersea navigation, launch/retrieval methods and surveying sensors designed for submersible use are, in the main, unsatisfactory, but their development is being pursued. Preliminary observations indicate that the following surveying missions could benefit most highly through employment of a Deep Ocean Survey Vehicle, (DOSV): (1) Site Surveys of small ocean bottom areas for installation of hardware or habitats; (2) Bottom Truth Surveys of representative areas for verification of surface-obtained data; (3) Route Selection Surveys of prospective cable or pipeline routes; (4) Biological Surveys for quantitative and qualitative assessment of marine biota; and (5) Geological Surveys of bottom sediments, structures and depositional/erosional processes. Although little, if any, ocean surveying per se has been performed from submersibles, sufficient observations exist to indicate that surface-conducted surveying may produce an erroneous impression of the bottom and near-bottom environment. Wide beam (60° cone) echo-sounding in the Bahamas completely missed 3 to 150 meter (10-500 ft.) high near-vertical cliffs and outcrops which have been observed from submersibles. Near-bottom current speeds have been observed to vary from essentially zero to 20 cm/sec (0.5 kns.) within a lateral distance of less than 1 meter. Zonation of currents along the bottom was observed in the Straits of Florida which would have been virtually impossible to observe and interpret with conventional measuring techniques. Abrupt changes in bottom sediment grain sizes have been observed which would lead to erroneous impressions if sampled from the surface. Preliminary tests have indicated that sediment bearing strengths measured from surface-collected cores may be in error by several orders of magnitude from measurements taken by manned submersibles in situ.

APA, Harvard, Vancouver, ISO, and other styles

32

Qin, Hongde, Zheyuan Wu, Yanchao Sun, and Yushan Sun. "Prescribed performance adaptive fault-tolerant trajectory tracking control for an ocean bottom flying node." International Journal of Advanced Robotic Systems 16, no. 3 (May 1, 2019): 172988141984194. http://dx.doi.org/10.1177/1729881419841943.

Full text

Abstract:

The ocean bottom flying node is a novel autonomous underwater vehicle that explores the oil and gas resources in deep water. Thousands of the ocean bottom flying nodes track different predefined trajectories arriving at target points in a small ocean area, respectively. A class of prescribed performance adaptive trajectory tracking control method is investigated for the ocean bottom flying node trajectory tracking problem with ocean current disturbances, model uncertainties as well as thruster faults. Based on a predefined performance function and an error transformation, the ocean bottom flying node trajectory tracking error is restricted to prespecified bounds to ensure a desired transient and steady response. Radial basis function neural network is used to approximate the general uncertainty caused by ocean current disturbances, model uncertainties, and thruster faults. Further, the upper bound of approximation error is estimated by an adaptive law. Using the adaptive laws, we propose a prescribed performance adaptive trajectory tracking controller. The simulation examples on an ocean bottom flying node system show that the proposed control scheme can compensate for the effect of the general uncertainty while obtaining the fast transient process and expected trajectory tracking accuracy.

APA, Harvard, Vancouver, ISO, and other styles

33

Kasaya, Takafumi, and Tada-nori Goto. "A small ocean bottom electromagnetometer and ocean bottom electrometer system with an arm-folding mechanism (Technical Report)." Exploration Geophysics 40, no. 1 (March 2009): 41–48. http://dx.doi.org/10.1071/eg08118.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Zhou, S. Q., L. Qu, Y. Z. Lu, and X. L. Song. "The instability of diffusive convection and its implication for the thermohaline staircases in the deep Arctic Ocean." Ocean Science 10, no. 1 (February 24, 2014): 127–34. http://dx.doi.org/10.5194/os-10-127-2014.

Full text

Abstract:

Abstract. In the present study, the classical description of diffusive convection is updated to interpret the instability of diffusive interfaces and the dynamical evolution of the bottom layer in the deep Arctic Ocean. In the new consideration of convective instability, both the background salinity stratification and rotation are involved. The critical Rayleigh number of diffusive convection is found to vary from 103 to 1011 in the deep Arctic Ocean as well as in other oceans and lakes. In such a wide range of conditions, the interface-induced thermal Rayleigh number is shown to be consistent with the critical Rayleigh number of diffusive convection. In most regions, background salinity stratification is found to be the main hindrance to the occurrence of convecting layers. With the new parameterization, it is predicted that the maximum thickness of the bottom layer is 1051 m in the deep Arctic Ocean, which is close to the observed value of 929 m. The evolution time of the bottom layer is predicted to be ~ 100 yr, which is on the same order as that based on 14C isolation age estimation.

APA, Harvard, Vancouver, ISO, and other styles

35

Saenko, O. A., and W. J. Merryfield. "On the Effect of Topographically Enhanced Mixing on the Global Ocean Circulation." Journal of Physical Oceanography 35, no. 5 (May 1, 2005): 826–34. http://dx.doi.org/10.1175/jpo2722.1.

Full text

Abstract:

Abstract The strong influence of enhanced diapycnal mixing over rough topography on bottom-water circulation is illustrated using results from two global ocean model experiments. In the first, diapycnal diffusivity is set to the observed background level of 10−5 m2 s−1 in regions not subject to shear instability, convection, or surface-driven mixing. In the second experiment, mixing is enhanced above rough bottom topography to represent the dissipation of internal tides. Three important results are obtained. First, without the enhanced mixing in the abyssal ocean, the deep North Pacific Ocean becomes essentially a stagnant basin, with little bottom-water circulation and very weak deep stratification. Allowing for the enhanced diapycnal mixing above rough bottom topography leads to increased bottom-water circulation and deep stratification and a potential vorticity distribution in the North Pacific that is much more realistic. Second, the enhanced diapycnal mixing above rough topography results in a significant intensification and deepening of the Antarctic Circumpolar Current, as well as in stronger bottom-water formation around Antarctica. Last, our experiments suggest that dissipation of internal tides and the associated enhanced diapycnal mixing in the abyssal ocean play no part in the circulation of deep water forming in the North Atlantic Ocean and in the associated transport of heat in the ocean.

APA, Harvard, Vancouver, ISO, and other styles

36

Rae, James W. B., and Wally Broecker. "What fraction of the Pacific and Indian oceans' deep water is formed in the Southern Ocean?" Biogeosciences 15, no. 12 (June 21, 2018): 3779–94. http://dx.doi.org/10.5194/bg-15-3779-2018.

Full text

Abstract:

Abstract. In this contribution we explore constraints on the fractions of deep water present in the Indian and Pacific oceans which originated in the northern Atlantic and in the Southern Ocean. Based on PO4* we show that if ventilated Antarctic shelf waters characterize the Southern contribution, then the proportions could be close to 50–50. If instead a Southern Ocean bottom water value is used, the Southern contribution is increased to 75 %. While this larger estimate may best characterize the volume of water entering the Indo-Pacific from the Southern Ocean, it contains a significant portion of entrained northern water. We also note that ventilation may be highly tracer dependent: for instance Southern Ocean waters may contribute only 35 % of the deep radiocarbon budget, even if their volumetric contribution is 75 %. In our estimation, the most promising approaches involve using CFC-11 to constrain the amount of deep water formed in the Southern Ocean. Finally, we highlight the broad utility of PO4* as a tracer of deep water masses, including descending plumes of Antarctic Bottom Water and large-scale patterns of deep ocean mixing, and as a tracer of the efficiency of the biological pump.

APA, Harvard, Vancouver, ISO, and other styles

37

LEE, KEUNHWA, and WOOJAE SEONG. "HYBRID ALGORITHM OF THE DEPTH SOLVER FOR WAVENUMBER INTEGRATION TECHNIQUE IN AN OCEAN WAVEGUIDE WITH A POROUS BOTTOM." Journal of Computational Acoustics 16, no. 01 (March 2008): 71–82. http://dx.doi.org/10.1142/s0218396x08003439.

Full text

Abstract:

A new hybrid algorithm of the depth solver for the wavenumber integration technique is derived. The global matrix method is adopted as the depth solver in the ocean, where there are sources and receivers present, and the reflectivity scheme is used for calculating the wave field of the porous ocean bottom. In order to hybridize both depth solvers, a novel technique has been developed where a virtual fluid layer with zero thickness is inserted between the ocean and the porous ocean bottom. This technique makes the hybrid algorithm simple to implement and compatible with any other depth solvers for the ocean bottom. Numerical simulation shows the proposed algorithm to work well.

APA, Harvard, Vancouver, ISO, and other styles

38

Ferrari, Raffaele, Ali Mashayek, Trevor J. McDougall, Maxim Nikurashin, and Jean-Michael Campin. "Turning Ocean Mixing Upside Down." Journal of Physical Oceanography 46, no. 7 (July 2016): 2239–61. http://dx.doi.org/10.1175/jpo-d-15-0244.1.

Full text

Abstract:

AbstractIt is generally understood that small-scale mixing, such as is caused by breaking internal waves, drives upwelling of the densest ocean waters that sink to the ocean bottom at high latitudes. However, the observational evidence that the strong turbulent fluxes generated by small-scale mixing in the stratified ocean interior are more vigorous close to the ocean bottom boundary than above implies that small-scale mixing converts light waters into denser ones, thus driving a net sinking of abyssal waters. Using a combination of theoretical ideas and numerical models, it is argued that abyssal waters upwell along weakly stratified boundary layers, where small-scale mixing of density decreases to zero to satisfy the no density flux condition at the ocean bottom. The abyssal ocean meridional overturning circulation is the small residual of a large net sinking of waters, driven by small-scale mixing in the stratified interior above the bottom boundary layers, and a slightly larger net upwelling, driven by the decay of small-scale mixing in the boundary layers. The crucial importance of upwelling along boundary layers in closing the abyssal overturning circulation is the main finding of this work.

APA, Harvard, Vancouver, ISO, and other styles

39

A. Boldyrev, S. "Angola-Brazil Geotraverse: Ocean-bottom seismoacoustic observations." Geofísica Internacional 35, no. 3 (July 1, 1996): 315–27. http://dx.doi.org/10.22201/igeof.00167169p.1996.35.3.465.

Full text

Abstract:

Se describen las observaciones sísmicas sobre el perfil Angola-Brasil durante 1980-1986 empleando estaciones submarinas (OBS). Se describe la sismicidad en la Dorsal del Atlántico Sur, el registro de fases T de un sismo localizado en las South Shetlands, y los residuos de dos telesismos para la Cuenca de Angola.

APA, Harvard, Vancouver, ISO, and other styles

40

JPT staff, _. "Multicomponent Analysis of Ocean-Bottom-Cable Data." Journal of Petroleum Technology 51, no. 06 (June 1, 1999): 42–43. http://dx.doi.org/10.2118/0699-0042-jpt.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Stutzmann, E. "MOISE: A Prototype Multiparameter Ocean-Bottom Station." Bulletin of the Seismological Society of America 91, no. 4 (August 1, 2001): 885–92. http://dx.doi.org/10.1785/0120000035.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Wech, A. G., A. F. Sheehan, C. M. Boese, J. Townend, T. A. Stern, and J. A. Collins. "Tectonic Tremor Recorded by Ocean Bottom Seismometers." Seismological Research Letters 84, no. 5 (September 1, 2013): 752–58. http://dx.doi.org/10.1785/0220120184.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Denney, Dennis. "Ocean-Bottom Cable for Multicomponent-Seismic Data." Journal of Petroleum Technology 52, no. 01 (January 1, 2000): 20–21. http://dx.doi.org/10.2118/0100-0020-jpt.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Bostock, M. G., and A. M. Trehu. "Wave-Field Decomposition of Ocean Bottom Seismograms." Bulletin of the Seismological Society of America 102, no. 4 (August 1, 2012): 1681–92. http://dx.doi.org/10.1785/0120110162.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Zhang, Z. Y., and C. T. Tindle. "Complex effective depth of the ocean bottom." Journal of the Acoustical Society of America 93, no. 1 (January 1993): 205–13. http://dx.doi.org/10.1121/1.405646.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

de Lavergne, Casimir, Gurvan Madec, Xavier Capet, Guillaume Maze, and Fabien Roquet. "Getting to the bottom of the ocean." Nature Geoscience 9, no. 12 (November 30, 2016): 857–58. http://dx.doi.org/10.1038/ngeo2850.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Jackins, P. D., G. C. Gaunaurd, and J. Arvelo. "Resonance reflections from a stratified ocean bottom." Journal of the Acoustical Society of America 80, S1 (December 1986): S116. http://dx.doi.org/10.1121/1.2023591.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Collins, Michael D. "Bottom interacting pulse propagation in the ocean." Journal of the Acoustical Society of America 82, S1 (November 1987): S122. http://dx.doi.org/10.1121/1.2024640.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Quijano, Jorge, Lisa Zurk, Altan Turgut, and D. J. Tang. "Ocean bottom scattering: characterization with chirp sonar." Journal of the Acoustical Society of America 120, no. 5 (November 2006): 3381–82. http://dx.doi.org/10.1121/1.4781636.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Zhang, Wentao, Zhaogang Wang, Wenzhu Huang, and Fang Li. "Optical fiber ocean bottom vector magnetometer array." Optical Engineering 57, no. 10 (October 30, 2018): 1. http://dx.doi.org/10.1117/1.oe.57.10.107106.

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!