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  • 11
    Online Resource
    Online Resource
    Transport and variability of the Antarctic Circumpolar Current south of Africa
    American Geophysical Union (AGU) ; 2008
    In:  Journal of Geophysical Research Vol. 113, No. C9 ( 2008-09-05)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 113, No. C9 ( 2008-09-05)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2007JC004223
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
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    detail.hit.zdb_id: 2016800-7
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    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 12
    Online Resource
    Online Resource
    Satellite‐Derived Ocean Heat Content Improves Cyclone Predictions: Utilization of Satellite‐Derived Oceanic Heat Content for Cyclone Studies: Hyderabad, India, 25–26 March 2010
    American Geophysical Union (AGU) ; 2010
    In:  Eos, Transactions American Geophysical Union Vol. 91, No. 43 ( 2010-10-26), p. 396-396
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 91, No. 43 ( 2010-10-26), p. 396-396
    Abstract: Recognizing the important role played by satellite‐derived sea surface height anomalies and upper ocean heat content (UOHC) in cyclone track and intensity prediction in the Atlantic and Pacific oceans, the National Remote Sensing Centre (NRSC) of the Indian Space Research Organisation (ISRO), Hyderabad, India, organized a 2‐day workshop. The goals of the workshop were to discuss recent advances and future work in the investigation of the role of oceans in cyclone track and intensity prediction, with special emphasis on northern Indian Ocean cyclones, and to strengthen the existing collaborative scientific investigations between NRSC and the U.S. National Oceanic and Atmospheric Administration (NOAA). The workshop also complemented other efforts by NOAA and the India Meteorological Department (IMD) geared toward the use of field experiments targeted to specific cyclones in the Bay of Bengal. Discussions at the workshop highlighted the fact that altimeter‐derived UOHC fields are more effective than sea surface temperatures alone in reducing error in cyclone track and intensity prediction. This is because with atmospheric conditions remaining the same, it is the upper ocean, not just the surface, that interacts with cyclones. Because the current network for sustained ocean observations was not specifically designed for the study or forecast of tropical cyclones globally or in particular in the northern Indian Ocean, products such as UOHC derived from satellites are the most appropriate alternatives for monitoring the upper ocean thermal structure.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2010EO430009
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
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    SSG: 16,13
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  • 13
    Online Resource
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    Investigation of Brazil Current rings in the confluence region
    American Geophysical Union (AGU) ; 2006
    In:  Journal of Geophysical Research Vol. 111, No. C6 ( 2006)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 111, No. C6 ( 2006)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2005JC002988
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2006
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    detail.hit.zdb_id: 3094268-8
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    SSG: 16,13
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  • 14
    Online Resource
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    Identifying and Estimating Biases between XBT and Argo Observations Using Satellite Altimetry
    American Meteorological Society ; 2010
    In:  Journal of Atmospheric and Oceanic Technology Vol. 27, No. 1 ( 2010-01-01), p. 226-240
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 27, No. 1 ( 2010-01-01), p. 226-240
    Abstract: A methodology is developed to identify and estimate systematic biases between expendable bathythermograph (XBT) and Argo observations using satellite altimetry. Pseudoclimatological fields of isotherm depth are computed by least squares adjustment of in situ XBT and Argo data to altimetry-derived sea height anomaly (SHA) data. In regions where the correlations between isotherm depth and SHA are high, this method reduces sampling biases in the in situ observations by taking advantage of the high temporal and spatial resolution of satellite observations. Temperature profiles from deep XBTs corrected for a bias identified and adopted during the 1990s are considered in this study. The analysis shows that the pseudoclimatological isotherm depths derived from these corrected XBTs are predominantly deeper than the Argo-derived estimates during the 2000–07 period. The XBT-minus-Argo differences increase with depth consistent with hypothesized problems in the XBT fall-rate equation. The depth-dependent XBT-minus-Argo differences suggest a global positive bias of 3% of the XBT depths. The fact that this 3% error is robust among the different ocean basins provides evidence for changes in the instrumentation, such as changes in the terminal velocity of the XBTs. The value of this error is about the inverse of the correction to the XBT fall-rate equation (FRE) implemented in 1995, suggesting that this correction, while adequate during the 1990s, is no longer appropriate and could be the source of the 3% error. This result suggests that for 2000–07, the XBT dataset can be brought to consistency with Argo by using the original FRE coefficients without the 1995 correction.
    Type of Medium: Online Resource
    ISSN: 1520-0426 , 0739-0572
    URL: Article
    DOI: 10.1175/2009JTECHO711.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2010
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  • 15
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    Online Resource
    OSSE Assessment of Underwater Glider Arrays to Improve Ocean Model Initialization for Tropical Cyclone Prediction
    American Meteorological Society ; 2020
    In:  Journal of Atmospheric and Oceanic Technology Vol. 37, No. 3 ( 2020-03), p. 467-487
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 37, No. 3 ( 2020-03), p. 467-487
    Abstract: Credible tropical cyclone (TC) intensity prediction by coupled models requires accurate forecasts of enthalpy flux from ocean to atmosphere, which in turn requires accurate forecasts of sea surface temperature cooling beneath storms. Initial ocean fields must accurately represent ocean mesoscale features and the associated thermal and density structure. Observing system simulation experiments (OSSEs) are performed to quantitatively assess the impact of assimilating profiles collected from multiple underwater gliders deployed over the western North Atlantic Ocean TC region, emphasizing advantages gained by profiling from moving versus stationary platforms. Assimilating ocean profiles collected repeatedly at fixed locations produces large root-mean-square error reduction only within ~50 km of each profiler for two primary reasons. First, corrections performed during individual update cycles tend to introduce unphysical eddy structure resulting from smoothing properties of the background error covariance matrix and the tapering of innovations by a localization radius function. Second, advection produces rapid nonlinear error growth at larger distances from profiler locations. The ability of each individual moving glider to cross gradients and map mesoscale structure in its vicinity substantially reduces this nonlinear error growth. Glider arrays can be deployed with horizontal separation distances that are 50%–100% larger than those of fixed-location profilers to achieve similar mesoscale error reduction. By contrast, substantial larger-scale bias reduction in upper-ocean heat content can be achieved by deploying profiler arrays with separation distances up to several hundred kilometers, with moving gliders providing only modest additional improvement. Expected sensitivity of results to study region and data assimilation method is discussed.
    Type of Medium: Online Resource
    ISSN: 0739-0572 , 1520-0426
    URL: Article
    DOI: 10.1175/JTECH-D-18-0195.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2020
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  • 16
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    More Than 50 Years of Successful Continuous Temperature Section Measurements by the Global Expendable Bathythermograph Network, Its Integrability, Societal Benefits, and Future
    Frontiers Media SA ; 2019
    In:  Frontiers in Marine Science Vol. 6 ( 2019-7-24)
    Details
    In: Frontiers in Marine Science, Frontiers Media SA, Vol. 6 ( 2019-7-24)
    Type of Medium: Online Resource
    ISSN: 2296-7745
    URL: Article
    DOI: 10.3389/fmars.2019.00452
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2019
    detail.hit.zdb_id: 2757748-X
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  • 17
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    Online Resource
    Ocean heat content for tropical cyclone intensity forecasting and its impact on storm surge
    Springer Science and Business Media LLC ; 2013
    In:  Natural Hazards Vol. 66, No. 3 ( 2013-4), p. 1481-1500
    Details
    In: Natural Hazards, Springer Science and Business Media LLC, Vol. 66, No. 3 ( 2013-4), p. 1481-1500
    Type of Medium: Online Resource
    ISSN: 0921-030X , 1573-0840
    URL: Article
    DOI: 10.1007/s11069-012-0214-5
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2013
    detail.hit.zdb_id: 2017806-2
    SSG: 14
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  • 18
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    Investigation of the Brazil Current front variability from altimeter data
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Oceans Vol. 106, No. C12 ( 2001-12-15), p. 31117-31128
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 106, No. C12 ( 2001-12-15), p. 31117-31128
    Abstract: The southwestern Atlantic Ocean is characterized by the confluence of the Brazil and Malvinas Currents, which form very strong surface and subsurface fronts that can be detected from hydrographic and remote sensing observations. Three data sets, consisting of TOPEX/Poseidon‐derived sea height anomalies, the climatologically derived depth of the 10°C isotherm, and reduced gravity, are used in conjunction with a two‐layer dynamical ocean scheme to monitor the Brazil Current front and to investigate its variability during a 6 year period (1993–1998). Results reveal that the fronts exhibit motions that are larger zonally than meridionally, showing strong interannual variability with annual mean amplitudes that range from 1° to 6°. The annual and semiannual components account for more than 75% of the variability of the frontal oscillations. In the annual cycle the frontal motions appear to be related closely to fluctuations in the baroclinic transport of the Brazil Current and are only influenced by the Malvinas Current when the Brazil Current transport is very small.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JC000396
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 19
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    Slow Down of the Gulf Stream during 1993–2016
    Springer Science and Business Media LLC ; 2019
    In:  Scientific Reports Vol. 9, No. 1 ( 2019-04-30)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 9, No. 1 ( 2019-04-30)
    Abstract: The Gulf Stream, the main heat-carrier from low to high latitudes in the North Atlantic Ocean, influences the climate and weather in the northern hemisphere. In this study we determine and analyze the position, speed, and width of the Gulf Stream (GS) from 80°W–50°W using satellite altimeter sea surface height (SSH) measurements to examine the possible link between changes in the strength of the GS and coastal sea levels along the U.S. East Coast. During our 24-year study period (1993–2016), the GS experienced a southward shift east of 65°W after passing the New England Seamount chain. This southward shift was accompanied by a weakening of the GS, associated with an increase in SSH to the north of the GS. West of 70°W, however, we found no statistically significant trends in the GS properties, consistent with results based on in situ measurements. This lack of a trend to the west fails to support a direct link between a long-term slowdown of the GS west of 70°W and sea level rise acceleration along the U.S. East Coast, though a slowdown of the GS east of 65°W may contribute to sea level rise. It is also possible that heat carried to the region by the GS may be responsible for these observed sea level changes.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-019-42820-8
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
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  • 20
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    Analysis of flight MH370 potential debris trajectories using ocean observations and numerical model results
    Informa UK Limited ; 2016
    In:  Journal of Operational Oceanography Vol. 9, No. 2 ( 2016-07-02), p. 126-138
    Details
    In: Journal of Operational Oceanography, Informa UK Limited, Vol. 9, No. 2 ( 2016-07-02), p. 126-138
    Type of Medium: Online Resource
    ISSN: 1755-876X , 1755-8778
    URL: Article
    DOI: 10.1080/1755876X.2016.1248149
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2016
    detail.hit.zdb_id: 2428097-5
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