Shelfbreak Frontal Dynamics in the Middle Atlantic Bight: Analysis of the SeaSoar Data from the ONR Shelfbreak PRIMER Experiment PDF Download
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Languages : en
Pages : 0
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Analysis of the Shelfbreak PRIMER data sets are described. These data sets, consisting of primarily high-resolution hydrographic surveys, show important shelfbreak processes including interaction of a slope eddy with the front, large-amplitude frontal meandering, and frontal response to wind forcing. In addition, collaborative work with acousticians on acoustic propagation across the front is also described. In general, the front is shown to contain large horizontal and vertical velocity shears, leading to large day-to-day variability. In addition to analysis of these data sets, analysis of drifter tracks near the front have also shown new perspectives on exchange across the front, and a stability analysis of the front was also performed.
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Languages : en
Pages : 0
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Book Description
Analysis of the Shelfbreak PRIMER data sets are described. These data sets, consisting of primarily high-resolution hydrographic surveys, show important shelfbreak processes including interaction of a slope eddy with the front, large-amplitude frontal meandering, and frontal response to wind forcing. In addition, collaborative work with acousticians on acoustic propagation across the front is also described. In general, the front is shown to contain large horizontal and vertical velocity shears, leading to large day-to-day variability. In addition to analysis of these data sets, analysis of drifter tracks near the front have also shown new perspectives on exchange across the front, and a stability analysis of the front was also performed.
Author: Derek Maxwell Burrage
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Category : Continental shelf
Languages : en
Pages : 770
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Author: Derek Maxwell Burrage
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Category :
Languages : en
Pages : 385
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Author: Carol A. Alessi
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Category : Arabian Sea
Languages : en
Pages : 500
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Temperature-salinity-depth profile data were obtained for the Persian Gulf, Southern Red Sea and parts of the Arabian Sea from the Master Oceanographic Observations Data Set (MOODS), located at the U.S. Naval Oceanographic Office (NAVOCEANO), Stennis Space Center, Mississippi. These data were used as part of a physical oceanographic study of the Red Sea and Persian Gulf outflows. This report documents the organization of the data set, method of quality control used to eliminate unrealistic data, and provides a summary in graphic form of the hydrographic observations.
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Category : Aquatic sciences
Languages : en
Pages : 240
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Author: Andrew Joseph Hirzel
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Category :
Languages : en
Pages : 0
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The Middle Atlantic Bight (MAB) is a highly productive ecosystem, supporting several economically important commercial fisheries. Chlorophyll enhancement at the MAB shelf-break front has been observed only intermittently, despite numerous studies that suggest persistent upwelling at the front. High resolution cross-frontal transect crossings were collected from three two-week cruises in April 2018, May 2019, and July 2019. Chapter 2 focused on applying a novel method of classifying planktonic images taken by a Video Plankton Recorder to enable processing of the large volumes of data collected with the instrument. Chapter 3 investigated cross-frontal trends by temporally averaging in both Eulerian and frontally-aligned coordinates. For April 2018, transient chlorophyll enhancement was seen at the front in individual transects and within the frontally-aligned mean transect, but not within the Eulerian mean transect. The Eulerian mean for May 2019 showed chlorophyll enhancement as a result of frontal eddies, which were further explored in chapter 4. No frontal enhancement was observed in July 2019. The frontal eddies observed in May 2019 were simulated using an idealized model, which showed that upwelling occurred within both of the frontal eddies, despite having opposite rotational directions. This result was consistent with nutrient enhancement observed within the centers of both eddies. Biological enhancement within each eddy was observed, which may have been a result of advection from source waters and/or a local response to upwelled nutrients. The influence of frontal variability and frontal eddies on nutrients and plankton at the front argues for the necessity for 3-D models to fully explain frontal behavior and its effects on biological responses.
Author: Norton Quincy Sloan
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ISBN:
Category : Atlantic Ocean
Languages : en
Pages : 460
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Category :
Languages : en
Pages :
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Author: Jacob Samuel Tse Forsyth
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Category :
Languages : en
Pages : 126
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Observations of hydrographic and dynamical properties on the Middle Atlantic Bight shelf document strong variability at time scales spanning events that last a few days to century long trends. This thesis studies individual processes which impact shelf temperature and velocity structure, and quantifies the mean velocity conditions at the shelf break. Chapter 2 uses model output to study the dynamics that lead to the breakdown of summertime thermal stratification, and how the processes which reduce stratification vary from year to year. In summer, the atmosphere heats the surface of the ocean, leading to strong thermal stratification with warm water overlying cool water. During fall, strong storm events with downwelling-favorable winds are found to be the primary process by which stratification is reduced. The timing of these events and the associated destratification varies from year to year. In Chapter 3, the velocity structure of the New Jersey shelf break is examine, with a focus on the Shelfbreak Jet. Using 25 years of velocity measurements, mean velocity sections of the Shelfbreak Jet are created in both Eulerian and stream coordinate frameworks. The jet exhibits strong seasonal variability, with maximum velocities observed in spring and minimum velocities in summer. Evidence is found that Warm Core Rings, originating from the Gulf Stream and passing through the Slope Sea adjacent to the New Jersey shelf, tend to shift the Shelfbreak Jet onshore of its mean position or entirely shutdown the Shelfbreak Jet’s flow. At interannual timescales, variability in the Shelfbreak Jet velocity is correlated with the temperature on the New Jersey Shelf, with temperature lagging by about 2 months. Chapter 4 focuses on the impact of Warm Core Rings on the velocity and temperature structure on the New Jersey shelf. Warm Core Rings that have higher azimuthal velocities and whose cores approach closer to the shelf are found to exert greater influence on the shelf’s along-shelf velocities, with the fastest and closest rings reversing the direction of flow at the shelf break. Warm Core Rings are also observed to exert long-lasting impacts on the shelf temperature, with faster rings cooling the shelf and slower rings warming the shelf. Seasonal changes in thermal stratification strongly affect how rings alter the shelf temperature. Rings in summer tend to cool the shelf, and rings throughout the rest of the year generally warm the shelf.
Author: Ke Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 169
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