GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2010-2014  (8)
  • 2014  (8)
  • 1
    facet.materialart.
    Unknown
    Data assimilative modeling investigation of Gulf Stream Warm Core Ring interaction with continental shelf and slope circulation (2014)
    John Wiley & Sons
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 119 (2014): 5968–5991, doi:10.1002/2014JC009898.
    Description: A data assimilative ocean circulation model is used to hindcast the interaction between a large Gulf Stream Warm Core Ring (WCR) with the Mid-Atlantic Bight (MAB) shelf and slope circulation. Using the recently developed Incremental Strong constraint 4D Variational (I4D-Var) data assimilation algorithm, the model assimilates mapped satellite sea surface height (SSH), sea surface temperature (SST), in situ temperature, and salinity profiles measured by expendable bathythermograph, Argo floats, shipboard CTD casts, and glider transects. Model validations against independent hydrographic data show 60% and 57% error reductions in temperature and salinity, respectively. The WCR significantly changed MAB continental slope and shelf circulation. The mean cross-shelf transport induced by the WCR is estimated to be 0.28 Sv offshore, balancing the mean along-shelf transport by the shelfbreak jet. Large heat/salt fluxes with peak values of 8900 W m−2/4 × 10−4 kg m−2 s−1 are found when the WCR was impinging upon the shelfbreak. Vorticity analysis reveals the nonlinear advection term, as well as the residual of joint effect of baroclinicity and bottom relief (JEBAR) and advection of potential vorticity (APV) play important roles in controlling the variability of the eddy vorticity.
    Description: Research support provided through ONR grants N00014-06-1-0739, N00014-10-1-0367, and NSF grant OCE-0927470 is much appreciated. B. Powell was supported by ONR grant N00014-09-10939. K. Chen was supported by the Woods Hole Oceanographic Institution Postdoctoral Scholar Program.
    Description: 2015-03-12
    Keywords: Gulf Stream ; Warm Core Ring ; Shelf circulation ; Data assimilation
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    Interannual sea level variability in the western North Atlantic : regional forcing and remote response (2014)
    John Wiley & Sons
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2013. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Geophysical Research Letters 40 (2013): 5915–5919, doi:10.1002/2013GL058013.
    Description: Annually averaged sea level (1970–2012) measured by tide gauges along the North American east coast is remarkably coherent over a 1700 km swath from Nova Scotia to North Carolina. Satellite altimetry (1993–2011) shows that this coherent interannual variability extends over the Middle Atlantic Bight, Gulf of Maine, and Scotian Shelf to the shelf break where there is a local minimum in sea level variance. Comparison with National Center for Environmental Prediction reanalysis winds suggests that a significant fraction of the detrended sea level variance is forced by the region's along-shelf wind stress. While interannual changes in sea level appear to be forced locally, altimetry suggests that the changes observed along the coast and over the shelf may influence the Gulf Stream path downstream of Cape Hatteras.
    Description: M. Andres gratefully acknowledges support from the Woods Hole Oceanographic Institution’s Coastal Ocean Institute. G. Gawarkiewicz acknowledges the support of NSF grant OCE-1129125.
    Keywords: Sea level ; Gulf Stream ; AMOC ; Continental shelf ; Wind stress ; Altimetry
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 3
    facet.materialart.
    Unknown
    Diagnosing the warming of the Northeastern U.S. Coastal Ocean in 2012 : a linkage between the atmospheric jet stream variability and ocean response (2014)
    John Wiley & Sons
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 119 (2014): 218–227, doi:10.1002/2013JC009393.
    Description: The temperature in the coastal ocean off the northeastern U.S. during the first half of 2012 was anomalously warm, and this resulted in major impacts on the marine ecosystem and commercial fisheries. Understanding the spatiotemporal characteristics of the warming and its underlying dynamical processes is important for improving ecosystem management. Here, we show that the warming in the first half of 2012 was systematic from the Gulf of Maine to Cape Hatteras. Moreover, the warm anomalies extended through the water column, and the local temperature change of shelf water in the Middle Atlantic Bight was largely balanced by the atmospheric heat flux. The anomalous atmospheric jet stream position induced smaller heat loss from the ocean and caused a much slower cooling rate in late autumn and early winter of 2011–2012. Strong jet stream intraseasonal oscillations in the first half of 2012 systematically increased the warm anomalies over the continental shelf. Despite the importance of advection in prior northeastern U.S. continental shelf interannual temperature anomalies, our analyses show that much of the 2012 warming event was attributed to local warming from the atmosphere.
    Description: K.C. was supported by the Woods Hole Oceanographic Institution Postdoctoral Scholarship, with funding provided by the Cooperative Institute for North Atlantic Region. G.G.G. was supported by grant N00014-11-1-0160 from the Office of Naval Research. S.J.L. was supported by the National Science Foundation under grant OCE-1154575.
    Description: 2014-07-13
    Keywords: 2012 warming ; Warm anomaly ; Northeastern U.S. Coastal Ocean ; Jet stream
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 4
    facet.materialart.
    Unknown
    Nutrient supply in the Southern East China Sea after Typhoon Morakot (2014)
    Sears Foundation for Marine Research
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © Sears Foundation for Marine Research, 2013. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 71 (2013): 133-149, doi:10.1357/002224013807343425.
    Description: Recent studies show that typhoons have profound effects on phytoplankton assemblages along their tracks, but it is difficult to quantitatively estimate nutrient supply after a typhoon's passage due to a lack of nutrient information before and after the arrival of a typhoon. During the passage of Typhoon Morakot (July 22 to Aug. 26, 2009), we conducted pre- and post-typhoon field cruises to study nutrient supply in the Southern East China Sea (SECS). The results showed nitrate and phosphate supplies to the water column in the SECS after the typhoon's passage were 5.6 × 1011 g-N/day and 7.8 × 1010 g-P/day which were significantly higher than those before the typhoon occurred (nitrate supply = 1 × 109 g-N/day, phosphate supply = 1.6 × 108 g-P/day). We conclude from this data, and after consulting the available physical data, that the highest nitrate concentration was caused by strong upwelling and/or vertical mixing, and input of nutrient-replete terrestrial waters. The nitrate and phosphate input related to the passage of Typhoon Morakot can account for approximately 86% and 87% of summer nitrate and phosphate supplies to the southern East China Sea.
    Description: This research was supported by the Top University Program and the National Science Council (NSC101-2116M-110- 001, NSC101-2611-M-110-015-MY3, NSC100-2119-M-110-003, NSC98-2611-M-019-014-MY3, NSC NSC98-2611-M-002-019-MY3) of Taiwan to C.-C. Hung, G.-C.Gong and S. Jan.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 5
    facet.materialart.
    Unknown
    Shelf water and chlorophyll export from the Hatteras slope and outer shelf (2014)
    John Wiley & Sons
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of Geophysical Research: Oceans 119 (2014): 4291–4304, doi:10.1002/2014JC009809.
    Description: Using high-resolution data acquired from a shipboard ADCP and a towed Scanfish equipped with a CTD and fluorometer, we examine the properties and transport of Middle Atlantic Bight (MAB) shelf water over a region of the Hatteras outer shelf and slope where MAB shelf water is commonly deflected offshore and entrained into the Gulf Stream. The data are from a period in early August 2004 when the seasonal pycnocline of the MAB is well developed and situated over a weakly stratified, near-bottom shelf water mass commonly referred to as the cold pool. Our data show chlorophyll-rich cold pool water carried rapidly southward over the slope and outer shelf, at a rate of up to 60 cm s−1, as part of the shelf-edge frontal jet. This southward transport of chlorophyll-rich cold pool water is shunted eastward and entrained into the Gulf Stream. However, the latitude band over which this export occurs varies significantly over the 7 day course of our study, a variation which is linked to an order 50 km shift in the latitude at which the Gulf Stream separates from the continental margin. The coupled rapid translation of the Gulf Stream frontal separation and the cold pool export zone is likely to have a significant impact on the movement and accumulation of biogenic material over the Hatteras slope and rise.
    Description: This work was supported by the U.S. National Science Foundation through grants OCE-03–27249 and OCE-0926999.
    Keywords: Shelf water export
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 6
    facet.materialart.
    Unknown
    The Quantifying, Predicting, and Exploiting Uncertainty Program : exploring oceanographic processes in a complex bathymetric shelf/slope environment affected by the Kuroshio (2014)
    Sears Foundation for Marine Research
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © Sears Foundation for Marine Research, 2013. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 71 (2013):1-18, doi:10.1357/002224013807343443.
    Description: We will describe the multi-disciplinary international program, Quantifying, Predicting and Exploiting Uncertainty, which consisted of observations, modeling and remote sensing studies focused on a region northeast of Taiwan in the East China Sea. We focus on results on the physical oceanographic and biogeochemical processes. Concurrent observations of acoustic propagation also occurred during the intensive observation period. This program was a joint Taiwan-U.S. effort involving four different ships sampling the continental shelf and slope during August-September, 2009. Primary goals of the program included 1) studying the structure and variability of the Cold Dome, a cool cyclonic feature frequently present in summer over the continental shelf; 2) examining the strength of upwelling from the continental slope to the shelf and the associated biogeochemical fluxes; and 3) establishing the predictability and structure of Kuroshio Intrusions onto the continental shelf. In addition, the program examined the characteristics of internal tides and waves in this region. During the intensive observations in Aug.-Sept., 2009, the continental shelf was strongly impacted by the passage of Typhoon Morakot across the region. Due to heavy rainfall throughout southern Taiwan, fresh water plumes impacted the continental shelf for several weeks after the typhoon. Numerical modeling studies show a pronounced cooling of 3°C after the storm, which are associated with significant fluxes of nitrate and phosphate onto the continental shelf. Both internal tides over the continental slope, as well as internal waves over the shelf and slope are characterized and compared with recent observations in other regions including the South China Sea and the northeastern U.S. off New Jersey. A particularly striking aspect of this region is the profusion of potential internal wave generation sites due to the presence of three different canyons with complex and steep bathymetry.
    Description: GG was supported by ONR Grant N00014-07-01-0482.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 7
    facet.materialart.
    Unknown
    Corrigendum to “Nutrient supply in the Southern East China Sea after Typhoon Morakot” (2014)
    Sears Foundation for Marine Research
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © Sears Foundation for Marine Research, 2013. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 71 (2013): 451-452, doi:10.1357/002224013812587609.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 8
    facet.materialart.
    Unknown
    Observations of a freshwater pulse induced by Typhoon Morakot off the northern coast of Taiwan in August 2009 (2014)
    Sears Foundation for Marine Research
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © Sears Foundation for Marine Research, 2013. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 71 (2013): 19-46, doi:10.1357/002224013807343452.
    Description: In this paper we describe large-scale impacts from a typhoon on the circulation over the continental shelf and slope north of Taiwan. Typhoon Morakot was a category 2 tropical storm that landed in central Taiwan, but caused destruction primarily in southern Taiwan from Aug. 8–10, 2009. The typhoon brought record-breaking rainfall; approximately 3 m accumulated over four days in southern Taiwan. River discharge on the west coast of Taiwan increased rapidly from Aug. 6–7 and peaked on Aug. 8, yielding a total volume 27.2 km3 of freshwater discharged off the west coast of Taiwan over five days (Aug. 6–10). The freshwater mixed with ambient seawater, and was carried primarily by the northeastward-flowing Taiwan Strait current to the sea off the northern coast of Taiwan. Two joint surveys each measured the hydrography and current velocity in the Taiwan Strait and off the northeastern coast of Taiwan roughly one week and two and a half weeks after Morakot. The first survey observed an Ω-shaped freshwater pulse off the northern tip of Taiwan, in which the salinity was ∼1 lower than the climatological mean salinity. The freshwater pulse met the Kuroshio and formed a density front off the northeastern coast of Taiwan. The hydrographic data obtained in the second survey suggested that the major freshwater pulse left the sea off the northern and northeastern coasts of Taiwan, which may have been carried by the Kuroshio to the northeast. Biogeochemical sampling conducted after Morakot suggested that the concentrations of nutrients in the upper ocean off the northern coast of Taiwan increased remarkably compared with their normal values. A typhoon-induced biological bloom is attributed to the inputs both from the nutrient-rich river runoff and upwelling of the subsurface Kuroshio water.
    Description: This study is supported by the National Science Council (NSC) of Taiwan under grant NSC98-2611-M-002-019-MY3. C.-C. Hung is supported by NSC under grant NSC100-2119-M- 110-003. LC was supported by ONR grant N00014-08-1-0557 and NOAA grant NA10OAR4320156.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...