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  • 1
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Paleomagnetism. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (407 pages)
    Edition: 2nd ed.
    ISBN: 9780080513461
    Series Statement: Issn Series ; v.Volume 73
    DDC: 538/.727
    Language: English
    Note: Cover -- Contents -- Preface -- Chapter 1. Geomagnetism and Paleomagnetism -- 1.1 Geomagnetism -- 1.2 Paleomagnetism -- Chapter 2. Rock Magnetism -- 2.1 Basic Principles of Magnetism -- 2.2 Magnetic Minerals in Rocks -- 2.3 Physical Theory of Rock Magnetism -- Chapter 3. Methods and Techniques -- 3.1 Sampling and Measurement -- 3.2 Statistical Methods -- 3.3 Field Tests for Stability -- 3.4 Laboratory Methods and Applications -- 3.5 Identification of Magnetic Minerals and Grain Sizes -- Chapter 4. Magnetic Field Reversals -- 4.1 Evidence for Field Reversal -- 4.2 The Geomagnetic Polarity Time Scale -- 4.3 Magnetostratigraphy -- 4.4 Polarity Transitions -- 4.5 Analysis of Reversal Sequences -- Chapter 5. Oceanic Paleomagnetism -- 5.1 Marine Magnetic Anomalies -- 5.2 Modeling Marine Magnetic Anomalies -- 5.3 Analyzing Older Magnetic Anomalies -- 5.4 Paleomagnetic Poles for Oceanic Plates -- 5.5 Evolution of Oceanic Plates -- Chapter 6. Continental Paleomagnetism -- 6.1 Analyzing Continental Data -- 6.2 Data Selection and Reliability Criteria -- 6.3 Testing the Geocentric Axial Dipole Model -- 6.4 Apparent Polar Wander -- 6.5 Phanerozoic APWPs for the Major Blocks -- Chapter 7. Paleomagnetism and Plate Tectonics -- 7.1 Plate Motions and Paleomagnetic Poles -- 7.2 Phanerozoic Supercontinents -- 7.3 Displaced Terranes -- 7.4 Rodinia and the Precambrian -- 7.5 Non-Plate Tectonic Hypotheses -- References -- Index -- International Geophysics Series -- Color Plate Section.
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  • 2
    Online Resource
    Online Resource
    Cambridge :Cambridge University Press,
    Keywords: Ocean currents - Mathematical models. ; Electronic books.
    Description / Table of Contents: Written by international experts in their field, this book is a review of Lagrangian observation, analysis and assimilation methods in physical and biological oceanography. It will be of great interest to researchers and graduate students looking for information on transport and dispersion in physical systems, biological modeling, and data assimilation.
    Type of Medium: Online Resource
    Pages: 1 online resource (525 pages)
    Edition: 1st ed.
    ISBN: 9780511273353
    DDC: 551.4620151
    Language: English
    Note: Cover -- Half-title -- Title -- Copyright -- Contents -- Contributors -- Preface -- 1 Evolution of Lagrangian methods in oceanography -- 1.1 Introduction -- 1.2 History of floats -- 1.2.1 The SOFAR float -- 1.2.2 The mini-MODE float -- 1.2.3 The POLYMODE float -- 1.2.4 The autonomous listening station (ALS) -- 1.2.5 The RAFOS float -- 1.2.6 The ALACE float -- 1.2.7 The ALFOS and MARVOR floats -- 1.2.8 Isopycnal operation -- 1.2.9 The compressee -- 1.2.10 The COOL float -- 1.2.11 Bottom-following floats -- 1.2.12 Convecting floats -- 1.3 Acoustic navigation -- 1.4 Float-based in-situ observations -- 1.4.1 Vertical velocity -- 1.4.2 Relative motion -- 1.4.3 Vertical movements in fronts -- 1.4.4 Static stability or f/h -- 1.4.5 Estimating salinity -- 1.4.6 Oxygen -- 1.4.7 The barotropic component -- 1.5 Some lessons learned -- 1.6 Future trends -- Acknowledgments -- References -- 2 Measuring surface currents with Surface Velocity Program drifters: the instrument, its data, and some recent results -- 2.1 Introduction -- 2.2 The SVP drifter -- 2.2.1 Design -- 2.2.2 Deployment -- 2.2.3 Data transmission -- 2.2.4 Drifter lifetime -- 2.3 Drifter dataquality control, interpolation and coverage -- 2.3.1 Quality control -- 2.3.2 Interpolation -- 2.3.3 Data coverage -- 2.4 Velocity observations -- 2.4.1 Slip, with and without a drogue -- 2.4.2 Ekman drift -- 2.5 Other observations -- Sea surface temperature (SST) -- Barometric pressure -- Wind -- Ocean color -- Salinity -- Subsurface temperature -- 2.6 Recent drifter-based studies: an overview -- 2.7 The future -- Acknowledgments -- References -- 3 Favorite trajectories -- 3.1 Mesoscale eddies in the Red Sea outflow region -- References -- 3.2 Conservation of potential vorticity in the Gulf Stream-Deep Western Boundary Current crossover region -- References. , 3.3 Are there closed surface pathways in the tropical Atlantic? -- 3.4 Near-surface dispersion of particles in the South China Sea -- References -- 3.5 The Naval Postgraduate School RAFOS Study -- References -- 3.6 Favorite drifter trajectories deployed from the western shelf of Florida and the coastal waters of the Florida Keys -- Acknowledgments -- References -- 3.7 On the Intermediate Circulation in the Iceland Basin -- References -- 3.8 Where is the diffusivity? -- References -- 3.9 Opposing trajectories in the Mediterranean! -- 3.10 Tracking the sub-polar gyre -- References -- 4 Particle motion in a sea of eddies -- Abstract -- 4.1 Introduction -- 4.2 The two-component view of mesoscale turbulence -- 4.3 Equations of motion -- 4.4 Mesoscale vortices as transport barriers -- 4.5 Estimate of Lagrangian statistics -- 4.6 Velocity statistics -- 4.7 Particle dispersion -- 4.8 Parameterization of particle dispersion -- 4.9 Mesoscale vortices and the marine ecosystem -- 4.10 Perspectives -- Acknowledgments -- References -- 5 Inertial particle dynamics on the rotating Earth -- 5.1 Introduction -- 5.2 The nondimensional equations of Inertial dynamics on a sphere -- 5.3 Hamiltonian form of the Inertial dynamics on a sphere: westward drift -- 5.4 Hamiltonian formulation on the β-plane and the zonal drift there -- 5. Concluding remarks -- Acknowledgments -- References -- 6 Predictability of Lagrangian motion in the upper ocean -- 6.1 Introduction -- 6.2 Problem statement -- 6.3 Multi-particle LSM -- 6.4 Prediction algorithms -- 6.4.1 Kalman filter -- 6.4.2 Regression -- 6.5 Monte Carlo experiments with LSM -- 6.5.1 EKF -- 6.5.2 Comparison of RA with EKF using LSM -- 6.6 Ocean circulation model simulations and in-situ data -- 6.6.1 Simulations with Miami isopycnic coordinate ocean model. , 6.6.2 In-situ drifter data: applications to Adriatic Sea and Pacific Ocean clusters -- Adriatic Sea clusters -- Pacific Ocean clusters -- 6.6.3 Comparison of EKF and RA using Pacific Ocean clusters -- 6.7 Optimal sampling -- 6.8 Summary and discussion -- Acknowledgments -- References -- 7 Lagrangian data assimilation in ocean general circulation models -- 7.1 Introduction -- 7.2 General formulation for Lagrangian data assimilation -- 7.3 Methodology -- 7.3.1 Correction of Eulerian velocity field from float position data -- 7.3.2 Dynamical compatibility between corrected velocity and layer thickness -- 7.3.3 Vertical projection of corrections in multi-layer models -- 7.3.4 Twin experiment approach and error analysis -- 7.4 Results -- 7.4.1 Impact of velocity field correction in single-layer QG -- 7.4.2 Sensitivity experiments -- 7.4.3 Impact of layer thickness correction in single-layer MICOM -- 7.4.4 Comparison with pseudo-Lagrangian assimilation methods -- 7.4.5 Impact of vertical projection in multi-layer MICOM -- 7.5 Conclusions -- Acknowledgments -- References -- 8 Dynamic consistency and Lagrangian data in oceanography: mapping, assimilation, and optimization schemes -- 8.1 Introduction -- 8.2 Background and history -- 8.2.1 Assimilation of ''pseudo-Lagrangian'' velocity -- 8.2.2 Assimilation of drifter positions -- 8.3 Analysis methods based on conservation laws -- 8.3.1 Conservation of temperature -- 8.3.2 Analysis based on vorticity conservation -- 8.4 Optimal trajectory between two positions -- 8.4.1 Optimization formulation with standard constraints -- 8.4.2 Constraints based on background statistics -- 8.5 Sequential data assimilation using the Kalman filter -- 8.5.1 Extended Kalman filter algorithm -- 8.5.2 Combining KF with the optimal contour -- 8.6 Lagrangian model dynamics and Kalman filter. , 8.7 An augmented state approach for Lagrangian positions -- 8.8 Concluding remarks -- Appendix A: Calculus of variation -- References -- 9 Observing turbulence regimes and Lagrangian dispersal properties in the oceans -- 9.1 Introduction -- 9.2 Lagrangian velocity spectra, velocity correlation function and diffusivity -- 9.3 Variability of time and space scales: two different regimes of dispersion -- 9.4 Hierarchy of Markovian LSM -- 9.5 Data analysis -- 9.6 Turbulence regimes and dispersal properties -- 9.7 Summary and concluding remarks -- Acknowledgments -- References -- 10 Lagrangian biophysical dynamics -- 10.1 Introduction -- 10.2 Describing the dynamics of marine populations -- 10.2.1 The average fish: mean field models -- 10.2.2 Structured population models -- 10.2.3 Mortality as a function of condition -- 10.3 Lagrangian implementation of structured models -- 10.3.1 Coupling the model to the rest of the ecosystem -- 10.3.2 Bioenergetics across trophic levels -- 10.3.3 The energetics of pelagic fish and the average ocean -- 10.4 Trajectories of marine life -- 10.4.1 Types of movement in the ocean -- 10.4.2 Eastern boundary currents and upwelling -- 10.4.3 Western boundary currents -- 10.4.4 Lagrangian dynamics at the mesoscale -- 10.4.5 Trajectories and behavior -- 10.4.6 Biological enhancement and aggregation dynamics -- 10.4.7 Schooling dynamics -- 10.4.8 Trajectories of organisms and recruitment -- 10.4.9 Some examples of Lagrangian problems in the coastal ocean -- 10.5 Modeling trajectories of marine organisms -- 10.5.1 Building a simulation model -- 10.5.2 Oceanographic connectivity in the Greater Caribbean: an example -- 10.5.3 Retention on topography: a final look -- 10.5.4 Simplified models for longer-term population dynamics -- 10.6 Conclusions -- Acknowledgments -- References -- 11 Plankton: Lagrangian inhabitants of the sea. , 11.1 Introduction -- 11.1.1 A historical view of plankton -- 11.1.2 The planktonic life mode -- 11.2 Lagrangian studies of plankton -- 11.2.1 Fate of individual larvae -- Direct observations of larval dispersal -- Mark/recapture techniques and geochemical signatures -- 11.2.2 Tracers -- Fluorescent dyes -- SF6 -- 11.2.3 Surface drifters -- Applications of surface drifters by biologists -- Upwelling zones -- Estuarine and river plumes -- Instrumented surface drifters -- Larval transport -- 11.2.4 Subsurface Platforms -- 11.3 Future directions -- Acknowledgments -- References -- 12 A Lagrangian stochastic model for the dynamics of a stage structured population. Application to a copepod population -- 12.1 Introduction -- 12.2 Basic assumptions of the modeling approach -- 12.3 Life history of an individual -- 12.3.1 Development and mortality processes -- 12.3.2 Reproduction process -- 12.3.3 Formalization of choice processes -- 12.3.4 Infinitesimal and finite time scale of noise -- 12.4 Dynamics of the overall population -- 12.4.1 Linear model -- 12.4.2 Feedback of the population size on the recruitment -- 12.4.3 Effects of the uncertainty levels -- 12.4.4 Eulerian formulation -- 12.5 Application to a copepod population -- 12.5.1 Malthusian growth -- 12.5.2 Limits to exponential growth -- 12.6 Concluding remarks -- Acknowledgments -- References -- 13 Lagrangian analysis and prediction of coastal and ocean dynamics (LAPCOD) -- 13.1 Introduction -- 13.2 The mean flow and flow variability -- 13.3 Methods for estimating mean flow and its variability from Lagrangian data -- 13.4 On the influence of topography on ocean motion -- 13.5 Dispersion and mixing -- 13.6 Biological Applications -- 13.7 Lagrangian stochastic models -- 13.8 Numerical simulations of ocean circulation and Lagrangian trajectories -- 13.9 Lagrangian data assimilation and prediction. , 13.10 Lagrangian-based dynamics.
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  • 3
    Publication Date: 2022-05-25
    Description: Conference name: North Atlantic Current (NAC) System; 19-20 April 1993, Woods Hole Oceanographic Institution, Woods Hole, MA
    Description: On April 19-20, 1993 a two-day workshop was held at the Woods Hole Oceanographic Institution on "The North Atlantic Current (NAC) System". The workshop, which was sponsored by NSF/NOAA/ONR reflected a growing sense of excitement and interest in the oceanographic community in the NAC system and its role in the large scale circulation of the North Atlantic Ocean and Climate of the adjoining landmasses. The presence of the North Atlantic Current with its warm waters at such high latitudes, and its role in both the wind-driven and thermohaline circulations makes it unique amongst the Western Boundary Currents of the oceans. Being on the one hand part of the wind-driven circulation and on the other hand the upper branch of the "Global Conveyor Belt", the North Atlantic current is indeed an enigma, suggesting fundamental issues about the nature of the coupling between the two 'roles' of the current that will need to be addressed. But it was also clear from the workshop discussions that there remain considerable uncertainty about the basic structure of the NAC. A high level of interest in these questions was evident at the workshop. The lectures, presentations, and the discussion sessions where observational and modelling issues were debated, brought out many ideas for the development and focus of future research of the NAC and surrounding waters. This report is intended to provide not only a synopsis of the lectures, papers, and ideas that were discussed, but also a scientific statement from the workshop reflecting a growing consensus for initiating a coordinated research effort in the region.
    Description: NSF/NOAA/ONR
    Keywords: Ocean currents
    Repository Name: Woods Hole Open Access Server
    Type: Working Paper
    Format: application/pdf
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  • 4
    Publication Date: 2022-10-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Goni, G. J., Sprintall, J., Bringas, F., Cheng, L., Cirano, M., Dong, S., Domingues, R., Goes, M., Lopez, H., Morrow, R., Rivero, U., Rossby, T., Todd, R. E., Trinanes, J., Zilberman, N., Baringer, M., Boyer, T., Cowley, R., Domingues, C. M., Hutchinson, K., Kramp, M., Mata, M. M., Reseghetti, F., Sun, C., Bhaskar, U., & Volko, D. More than 50 years of successful continuous temperature section measurements by the global expendable bathythermograph network, its integrability, societal benefits, and future. Frontiers in Marine Science, 6, (2019): 452, doi:10.3389/fmars.2019.00452.
    Description: The first eXpendable BathyThermographs (XBTs) were deployed in the 1960s in the North Atlantic Ocean. In 1967 XBTs were deployed in operational mode to provide a continuous record of temperature profile data along repeated transects, now known as the Global XBT Network. The current network is designed to monitor ocean circulation and boundary current variability, basin-wide and trans-basin ocean heat transport, and global and regional heat content. The ability of the XBT Network to systematically map the upper ocean thermal field in multiple basins with repeated trans-basin sections at eddy-resolving scales remains unmatched today and cannot be reproduced at present by any other observing platform. Some repeated XBT transects have now been continuously occupied for more than 30 years, providing an unprecedented long-term climate record of temperature, and geostrophic velocity profiles that are used to understand variability in ocean heat content (OHC), sea level change, and meridional ocean heat transport. Here, we present key scientific advances in understanding the changing ocean and climate system supported by XBT observations. Improvement in XBT data quality and its impact on computations, particularly of OHC, are presented. Technology development for probes, launchers, and transmission techniques are also discussed. Finally, we offer new perspectives for the future of the Global XBT Network.
    Description: GG, FB, SD, UR, MB, RD, and DV were supported by a grant from the NOAA/Ocean Observing and Monitoring Division (OOMD) and by NOAA's Atlantic Oceanographic and Meteorological Laboratory (AOML). The participation of JS and NZ in this study was supported by NOAA's Global Ocean Monitoring and Observing Program through Award NA15OAR4320071 and NSF Award 1542902. CD was funded by the Australian Research Council (FT130101532 and DP160103130); the Scientific Committee on Oceanic Research (SCOR) Working Group 148, funded by national SCOR committees and a grant to SCOR from the U.S. National Science Foundation (Grant OCE-1546580); and the Intergovernmental Oceanographic Commission of UNESCO/International Oceanographic Data and Information Exchange (IOC/IODE) IQuOD Steering Group. LC was supported by 2016YFC1401800.
    Keywords: Expendable bathythermographs ; Surface currents ; Subsurface currents ; Meridional heat transport ; Ocean heat content ; Sea level ; Extreme weather
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 5
    Publication Date: 2022-05-26
    Description: Author Posting. © The Authors, 2004. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part II: Topical Studies in Oceanography 52 (2005): 627-650, doi:10.1016/j.dsr2.2004.12.011.
    Description: RAFOS float trajectories near the 27.5 density level were analyzed to investigate discrete eddies in the northern North Atlantic with the objective of determining their geographical distribution and characteristics. Floats that made two or more consecutive loops in the same direction (loopers) were considered to have been in an eddy. Overall 15% (24 float years) of the float data were in loopers. One hundred and eight loopers were identified in 96 different eddies. Roughly half of the eddies were cyclonic (49%) and half were anticyclonic (51%), although the percentages varied in different regions. A few eddies were quasi-stationary for long times, one for over a year in the Iceland Basin, and many others clearly translated, often in the direction of the general circulation as observed by non-looping floats. Several floats were trapped in eddies in the vicinity of the North Atlantic Current just upstream (west) of the Charlie Gibbs (52ºN) and Faraday (50ºN) Fracture Zones, which seem to be preferred routes for flow crossing the mid-Atlantic ridge. Five floats looped in four anticyclones which translated southwestward away from the eastern boundary near the Goban Spur (47ºN-50ºN). These could have been weak meddies forming from remnants of warm salty Mediterranean Water advected northward along the eastern boundary.
    Description: Funds for this research were provided by National Science Foundation grants OCE-9531877 to WHOI and OCE-9906775 to URI. This work was also supported by a grant from the WHOI Associates.
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: 7177368 bytes
    Format: application/pdf
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  • 6
    Publication Date: 2022-05-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Rossby, T., Flagg, C. N., Donohue, K., Fontana, S., Curry, R., Andres, M., & Forsyth, J. Oleander is more than a flower twenty-five years of oceanography aboard a merchant vessel. Oceanography, 32(3), (2019): 126-137, doi:10.5670/oceanog.2019.319.
    Description: Since late fall 1992, CMV Oleander III has been measuring upper ocean currents during its weekly trips between Bermuda and Port Elizabeth, New Jersey, by means of an acoustic Doppler current profiler installed in its hull. The overarching objective of this effort has been to monitor transport in the Gulf Stream and surrounding waters. With 25 years of observation in hand, we note that the Gulf Stream exhibits significant year-to-year variations but no evident long-term trend in transport. We show how these data have enabled studies of oceanic variability over a very wide range of scales, from a few kilometers to the full 1,000 km length of its route. We report that the large interannual variations in temperature on the continental shelf are negatively correlated with flow from the Labrador Sea, but that variability in the strength of this flow cannot account for a longer-term warming trend observed on the shelf. Acoustic backscatter data offer a rich trove of information on biomass activities over a wide range of spatial and temporal scales. A peek at the future illustrates how the new and newly equipped Oleander will be able to profile currents to greater depths and thereby contribute to monitoring the strength of the meridional overturning circulation.
    Description: First and foremost we extend our heartfelt thanks to the Bermuda Container Line/Neptune Group Management Ltd for permission to operate an acoustic Doppler current profiler on board CMV Oleander III, a 150 kHz ADCP between 1992 and 2004, and a 75 kHz ADCP between 2005 and 2018. Their interest and support is gratefully acknowledged. Cor Teeuwen, our initial contact in Holland while the ship was still under construction, played an important role in facilitating the original ADCP installation. His evident interest to make this concept work has stimulated similar activities on other commercial vessels. The interest and willingness of the shipping industry to be supportive of science has been a very positive experience for all of us who have ventured in this direction. Initial funding came from NOAA and the Office of Naval Research. Since 1999, the National Science Foundation has supported the project through funding to the University of Rhode Island and Stony Brook University, and now also to the Bermuda Institute of Ocean Sciences (BIOS), which will be taking over the Oleander operation. NSF is also funding the current transition to the new CMV Oleander. In the early years, G. Schwartze and E. Gottlieb were very helpful with technical support for the project. This included frequent visits to the ship before we had the capability to transfer the data through the Ethernet. We thank Jules Hummon and Eric Firing for adapting the UNOLS-wide UHDAS ADCP operating system to the merchant marine environment. We thank E. Williams and P. Ortner at the Rosenstiel School of Marine and Atmospheric Science, University of Miami, for making the 38 kHz ADCP data from Explorer of the Seas available to us. We also want to thank the NOAA Ship Of Opportunity Program for continued interest in and support of XBT operations along the Oleander section. That support started over 40 years ago and is now stronger than ever. All ADCP data from 1992 through 2018 have been archived at the Joint Archive for Shipboard ADCP (JASADCP), established at the University of Hawaii by NOAA’s National Centers for Environmental Information (NCEI). Averaged yearly data sets can be downloaded in ASCII text or NetCDF formats (http://ilikai.soest.hawaii.edu/​sadcp/main_inv.html). We thank Patrick Caldwell, JASADCP’s manager, for his assistance. All ADCP and XBT data can be obtained at the Stony Brook website: http://po.msrc.sunysb.edu/Oleander/. The URL to the project website is http://oleander.bios.edu—an updated data portal and products will soon be accessible here. An ERDDAP server for Oleander data (in the process of being configured) is at this address: http://erddap.​oleander.​bios.edu:​8080/​erddap/. The following link to BIOS lists over 40 publications that have used the ADCP data one way or another: http://oleander.bios.edu/publications/. We thank the two reviewers for their many interesting and helpful comments and suggestions.
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 7
    Publication Date: 2022-05-26
    Description: Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 34 (2017): 2673-2682, doi:10.1175/JTECH-D-17-0054.1.
    Description: Expendable bathythermographs (XBT) to profile upper-ocean temperatures from vessels in motion have been in use for some 50 years now. Developed originally for navy use, they were soon adapted by oceanographers to map out upper-ocean thermal structure and its space–-time variability from both research vessels and merchant marine vessels in regular traffic. These activities continue today. This paper describes a new technology—the Autonomous Expendable Instrument System (AXIS)—that has been developed to provide the capability to deploy XBT probes on a predefined schedule, or adaptively in response to specific events without the presence of an observer on board. AXIS is a completely self-contained system that can hold up to 12 expendable probes [XBTs, XCTDs, expendable sound velocimeter (XSV)] in any combination. A single-board Linux computer keeps track of what probes are available, takes commands from ashore via Iridium satellite on what deployment schedule to follow, and records and forwards the probe data immediately with a time stamp and the GPS position. This paper provides a brief overview of its operation, capabilities, and some examples of how it is improving coverage along two lines in the Atlantic.
    Description: Initial development of AXIS mechanical design elements wasmade possible by awards from the Cecil H. and Ida M. Green Technology Innovation Fund and the Sealark Foundation to the team of Dave Fratantoni, Keith von der Heydt (WHOI), and Terry Hammar (WHOI). Construction of the first full AXIS prototype was supported by a technology grant from the National Science Foundation (OCE-0926853) and the second one through an NSF-funded (OCE-1061185) subcontract from the University of Rhode Island.
    Description: 2018-06-28
    Keywords: In situ oceanic observations ; Instrumentation/sensors ; Profilers, oceanic ; Ship observations
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 8
    Publication Date: 2022-05-26
    Description: Also published as Journal of Marine Research, 1975, Volume 33, No . 3, pp. 355-382
    Description: Twenty neutrally buoyant SOFAR floats were used in the Mid-Ocean Dynamics Experiment (MODE) to study the structure and variability of the deep ocean currents. The floats were clustered so that the pattern of motions could be resolved (mapping and pattern recognition). A number of float trajectories are shown and the very individual character of their signature is emphasized. Some floats remain nearly stationary for a year whereas others will cover hundreds of kilometers to the south or west in just a few months. Superposition of all trajectories in the spaghetti diagram is shown to reveal considerable organization of the "eddy" field in the MODE area and is thought to be caused by the near presence of the Blake-Bahama Outer Ridge to the west. There is considerable asymmetry to the float dispersal with floats rapidly scattering to the south and west, but not to the north and east even though the r .m.s. velocities are a factor 3 to 6 times greater than the mean drift. The evolution and dispersal of the float cluster is illustrated in a set of figures in each of which a 12 day segment of all float trajectories is displayed. At times their mobility and relative motion is shown to be associated with onset of sudden swirls and regions of large horizontal shear, features that are not evident from the analysis of individual trajectories. Cluster averages of the float velocities and kinetic energy, computed weekly and plotted as a function of time, show substantial variability. Much better averages are obtained by limiting the cluster to floats within a geographical region. As the spaghetti diagram indicates and the following paper discusses in more detail there exist substantial geographical variations in the average kinetic energy levels. These may be in some way caused topographically by the close proximity to the continental margin. Whatever the reason they caution us to reexamine the notion that the scale of variation of the second order eddy statistics is large compared to the eddies themselves, at least in the MODE-I area. Ten floats also contained a system to record the local pressure, temperature and vertical currents. The pressure and temperature yield data concerning low frequency vertical displacements and the vertical current meters measure the internal wave sea state which is shown to be remarkably constant.
    Description: Prepared for the Office of Naval Research under Contracts N00014-66-C-0241; NR 083-004 ( WHOI), N00014-67-A-0097-001 (Yale University) and NSF Grants GX-30220 (WHOI), GX-30416 (Yale University) .
    Keywords: Oceanography ; Mid-Ocean Dynamics Experiment (MODE)
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 9
    Publication Date: 2022-10-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Szuts, Z. B., Bower, A. S., Donohue, K. A., Girton, J. B., Hummon, J. M., Katsumata, K., Lumpkin, R., Ortner, P. B., Phillips, H. E., Rossby, H. T., Shay, L. K., Sun, C., & Todd, R. E. The scientific and societal uses of global measurements of subsurface velocity. Frontiers in Marine Science, 6, (2019): 358, doi:10.3389/fmars.2019.00358.
    Description: Ocean velocity defines ocean circulation, yet the available observations of subsurface velocity are under-utilized by society. The first step to address these concerns is to improve visibility of and access to existing measurements, which include acoustic sampling from ships, subsurface float drifts, and measurements from autonomous vehicles. While multiple programs provide data publicly, the present difficulty in finding, understanding, and using these data hinder broader use by managers, the public, and other scientists. Creating links from centralized national archives to project specific websites is an easy but important way to improve data discoverability and access. A further step is to archive data in centralized databases, which increases usage by providing a common framework for disparate measurements. This requires consistent data standards and processing protocols for all types of velocity measurements. Central dissemination will also simplify the creation of derived products tailored to end user goals. Eventually, this common framework will aid managers and scientists in identifying regions that need more sampling and in identifying methods to fulfill those demands. Existing technologies are capable of improving spatial and temporal sampling, such as using ships of opportunity or from autonomous platforms like gliders, profiling floats, or Lagrangian floats. Future technological advances are needed to fill sampling gaps and increase data coverage.
    Description: This work was supported by the National Science Foundation, United States, Grant Numbers 1356383 to ZBS, OCE 1756361 to ASB at the Woods Hole Oceanographic Institution, and 1536851 to KAD and HTR; the National Oceanographic and Atmospheric Administration, United States, Ocean Observations and Monitoring Division and Atlantic Oceanographic and Meteorological Laboratory to RL; Royal Caribbean Cruise Ltd., to PBO; the Australian Government Department of the Environment and Energy National Environmental Science Programme and Australian Research Council Centre of Excellence for Climate Extremes to HEP; and the Gulf of Mexico Research Initiative Grant V-487 to LS.
    Keywords: Velocity ; Ocean measurements ; Subsurface ; Database ; Sampling network ; ADCP ; Autonomous vehicle ; Floats
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 10
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    In:  Graduate School of Oceanography, University of Rhode Island at Narragansett
    Publication Date: 2023-03-10
    Keywords: Comment; Current velocity, east-west; Current velocity, north-south; DATE/TIME; Floater; LATITUDE; LONGITUDE; LSU406; PALACE; Pressure, maximum; Profiling auto. lagrangian circulation explorer; South Atlantic Ocean; Subsurface float; Temperature, water; WOCE; World Ocean Circulation Experiment
    Type: Dataset
    Format: text/tab-separated-values, 1291 data points
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