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  • 1
    Online Resource
    Online Resource
    Evidence for eddy formation in the eastern Arabian Sea during the northeast monsoon
    American Geophysical Union (AGU) ; 1994
    In:  Journal of Geophysical Research: Oceans Vol. 99, No. C4 ( 1994-04-15), p. 7651-7664
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 99, No. C4 ( 1994-04-15), p. 7651-7664
    Abstract: The seasonal formation of a large (500–800 km diameter) anticyclonic eddy in the upper 300–400 m of the eastern Arabian Sea during the northeast monsoon period (December‐April) is indicated from hydrographic and satellite altimetry sea level observations, as well as from numerical model experiments. The center of the eddy circulation is approximately 10°N, 70°E, just to the west of the north‐south Laccadive Island chain. In this paper the eddy is called the Laccadive High (LH). In some ways it is a mirrorlike counterpart to the Great Whirl, which develops during the southwest monsoon off the Somali coast (western Arabian Sea). The LH occurs at the same latitude but on the opposite side of the basin during the reversed monsoon. It is different from the Great Whirl, however, in its formation process, its intensity, and its decay. The hydrographic data obtained from surveys all during a single season give sufficiently close station spacing to allow reasonable contouring of the geopotential surfaces and of the properties within and around the LH region with minimum time aliasing. The Geosat altimeter record extends over 4 years, during which the seasonal variability of the LH indicates a dynamic relief of approximately 15–20 cm, which is in good agreement with the hydrographic observations. The altimetry time series also suggests a westward translation of the LH by January with a subsequent dissipation in midbasin. The model used is a wind‐forced three‐layer primitive equation model which depicts a LH in agreement with the timing, position, and amplitude of both the hydrographic and altimetric measurements. The numerical simulation includes a passive tracer located in the western Bay of Bengal; the western advection of the tracer around the south coasts of Sri Lanka and India in December and January is consistent with the appearance of low‐salinity water observed to extend into the Arabian Sea during this period. The modeling studies suggest that both local and remote forcing are important in formation of the LH.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JC00035
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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  • 2
    Online Resource
    Online Resource
    Sensitivity of the Arabian Sea mixed layer to 1994–1995 operational wind products
    American Geophysical Union (AGU) ; 2000
    In:  Journal of Geophysical Research: Oceans Vol. 105, No. C6 ( 2000-06-15), p. 14141-14162
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 105, No. C6 ( 2000-06-15), p. 14141-14162
    Abstract: The evolution of the upper ocean in the strong seasonally forced Arabian Sea, as observed by a mooring deployed in 1994–1995, is investigated using the Naval Research Laboratory Layered Ocean Model (NLOM). Model simulations were sensitive to the choice of surface wind products used for forcing, and results are reported for simulations forced by monthly mean climatologies and 12 hourly 1994–1995 wind products from two operational atmospheric forecast models, the European Centre for Medium‐Range Weather Forecast model and the Navy Operational Global Atmospheric Prediction System model of Fleet Numerical Meteorology and Oceanography Center (FNMOC). The NLOM yields the best prediction of sea surface temperature (SST) and mixed layer depth when using FNMOC forcing. Surface cooling is found to be responsible for the seasonal SST minimum during the NE monsoon. Heat advection is found to be important for supporting the surface cooling during the second half of the NE monsoon. Strong entrainment and appreciable advective cooling are responsible for the SST minimum of the SW monsoon. The NLOM wind experiments strongly suggest that thermal convection may be important in the central Arabian Sea during the winter months.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JC900042
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2000
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  • 3
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    A COAMPS™ reanalysis for the Eastern Pacific: Properties of the diurnal sea breeze along the central California coast : PROPERTIES OF THE DIURNAL SEA BREEZE ALONG THE CENTRAL CALIFORNIA COAST
    American Geophysical Union (AGU) ; 2002
    In:  Geophysical Research Letters Vol. 29, No. 24 ( 2002-12), p. 56-1-56-4
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 29, No. 24 ( 2002-12), p. 56-1-56-4
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2002GL015566
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
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    detail.hit.zdb_id: 7403-2
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  • 4
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    On the relationship between satellite-estimated bio-optical and thermal properties in the Gulf of Mexico : BIO-THERMAL PROPERTIES IN THE GULF
    American Geophysical Union (AGU) ; 2008
    In:  Journal of Geophysical Research: Biogeosciences Vol. 113, No. G1 ( 2008-03), p. n/a-n/a
    Details
    In: Journal of Geophysical Research: Biogeosciences, American Geophysical Union (AGU), Vol. 113, No. G1 ( 2008-03), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2006JG000373
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
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  • 5
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    A high-resolution surface vector wind product for coastal oceans: Blending satellite scatterometer measurements with regional mesoscale atmospheric model simulations : HIGH-RESOLUTION WIND FOR COASTAL OCEANS
    American Geophysical Union (AGU) ; 2003
    In:  Geophysical Research Letters Vol. 30, No. 1 ( 2003-01), p. 13-1-13-4
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 30, No. 1 ( 2003-01), p. 13-1-13-4
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2002GL015729
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2003
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    detail.hit.zdb_id: 7403-2
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  • 6
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    The 26‐ and 50‐day oscillations in the western Indian Ocean: Model results
    American Geophysical Union (AGU) ; 1989
    In:  Journal of Geophysical Research: Oceans Vol. 94, No. C4 ( 1989-04-15), p. 4721-4736
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 94, No. C4 ( 1989-04-15), p. 4721-4736
    Abstract: The circulation of the western Indian Ocean is examined using a reduced‐gravity model with one active layer and realistic basin geometry for the entire Indian Ocean north of 30°S. The Hellerman and Rosenstein monthly mean wind stress climatology is used to force the model. The numerical simulations reproduce the observed (Luyten and Roemmich, 1982) 26‐day waves along the equator and the 50‐day oscillations (Mysak and Mertz, 1984; Schott et al. 1988) between the equator and Madagascar. The 25‐ to 28‐day oscillations of the model meridional velocity component agree with observed values of period, amplitude, wavelength, group velocity, and phase of the seasonal modulation. The model oscillations, which are excited in August and persist into February–March, are shown to be the result of Yanai waves generated between the western boundary and 50°E. During the southwest monsoon, the Yanai waves are initiated by a complex barotropic instability associated with the southern gyre. During the early stages of the northeast monsoon, the 26‐day Yanai waves are generated by resonant forcing due to the intrusion into the equatorial waveguide of a standing, 800‐ to 900‐km‐wavelength meander of the eastward flow fed by the East African Coastal Current. Hence the simulation reveals that the 26‐day oscillations in the equatorial Indian Ocean are excited by mechanisms significantly different than that believed to be responsible for the 20‐ to 30‐day oscillations in the equatorial Atlantic and Pacific oceans. The numerical simulation also shows a 50‐day oscillation between the equator and Madagascar west of 50°E. This periodicity is due to Rossby waves generated by a barotropic instability associated with the East African Coastal Current beginning about April each year. No evidence of the 50‐day period oscillation is found in a corresponding linear simulation. Hence the barotropic instability of the oceanic currents in this region is offered as an alternative to direct wind forcing as the generating mechanism for the observed 40‐ to 60‐day oscillations in the western Indian Ocean.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JC094iC04p04721
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1989
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  • 7
    Online Resource
    Online Resource
    A Numerical Simulation of the Onset of El Niño
    American Meteorological Society ; 1976
    In:  Journal of Physical Oceanography Vol. 6, No. 5 ( 1976-09), p. 621-631
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 6, No. 5 ( 1976-09), p. 621-631
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/1520-0485(1976)006〈0621:ANSOTO〉2.0.CO;2
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 1976
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  • 8
    Online Resource
    Online Resource
    Summary diagrams for coupled hydrodynamic-ecosystem model skill assessment
    Elsevier BV ; 2009
    In:  Journal of Marine Systems Vol. 76, No. 1-2 ( 2009-2), p. 64-82
    Details
    In: Journal of Marine Systems, Elsevier BV, Vol. 76, No. 1-2 ( 2009-2), p. 64-82
    Type of Medium: Online Resource
    ISSN: 0924-7963
    URL: Article
    DOI: 10.1016/j.jmarsys.2008.05.014
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2009
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  • 9
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    The interaction of southwest monsoon upwelling, advection and primary production in the northwest Arabian Sea
    Elsevier BV ; 1997
    In:  Journal of Marine Systems Vol. 13, No. 1-4 ( 1997-10), p. 61-82
    Details
    In: Journal of Marine Systems, Elsevier BV, Vol. 13, No. 1-4 ( 1997-10), p. 61-82
    Type of Medium: Online Resource
    ISSN: 0924-7963
    URL: Article
    DOI: 10.1016/S0924-7963(97)00003-1
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1997
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  • 10
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    Physical processes affecting availability of dissolved silicate for diatom production in the Arabian Sea
    American Geophysical Union (AGU) ; 1994
    In:  Journal of Geophysical Research: Oceans Vol. 99, No. C11 ( 1994-11-15), p. 22619-22632
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 99, No. C11 ( 1994-11-15), p. 22619-22632
    Abstract: A passive tracer to represent dissolved silicate concentrations, with biologically realistic uptake kinetics, is successfully incorporated into a three‐dimensional, eddy‐resolving, ocean circulation model of the Indian Ocean. Hypotheses are tested to evaluate physical processes which potentially affect the availability of silicate for diatom production in the Arabian Sea. An alternative mechanism is offered to the idea that open ocean upwelling is primarily responsible for the high, vertical nutrient flux and consequent large‐scale phytoplankton bloom in the northwestern Arabian Sea during the southwest monsoon. Model results show that dissolved silicate in surface waters available for uptake by diatoms is primarily influenced by the intensity of nearshore upwelling from southwest monsoonal wind forcing and by the offshore advective transport of surface waters. The upwelling, which in the model occurs within 200±50 km of the coast, appears to be a result of a combination of coastal upwelling, Ekman pumping, and divergence of the coastal flow as it turns offshore. Localized intensifications of silicate concentrations appear to be hydrodynamically driven and geographically correlated to coastal topographic features. The absence of diatoms in sediments of the eastern Arabian Basin is consistent with modeled distributional patterns of dissolved silicate resulting from limited westward advection of upwelled coastal waters from the western continental margin of India and rapid uptake of available silicate by diatoms. Concentrations of modeled silicate become sufficiently low to become unavailable for diatom production in the eastern Arabian Sea, a region between 61°E and 70°E at 8°N on the south, with the east and west boundaries converging on the north at ∼67°E, 20°N.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JC01449
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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