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    Idealized Modeling of the Atmospheric Boundary Layer Response to SST Forcing in the Western Indian Ocean

    Source: Journal of the Atmospheric Sciences:;2019:;volume 076:;issue 007::page 2023
    Author:
    Rydbeck, Adam V.
    ,
    Jensen, Tommy G.
    ,
    Igel, Matthew R.
    DOI: 10.1175/JAS-D-18-0303.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe atmospheric response to sea surface temperature (SST) variations forced by oceanic downwelling equatorial Rossby waves is investigated using an idealized convection-resolving model. Downwelling equatorial Rossby waves sharpen SST gradients in the western Indian Ocean. Changes in SST cause the atmosphere to hydrostatically adjust, subsequently modulating the low-level wind field. In an idealized cloud model, surface wind speeds, surface moisture fluxes, and low-level precipitable water maximize near regions of strongest SST gradients, not necessarily in regions of warmest SST. Simulations utilizing the steepened SST gradient representative of periods with oceanic downwelling equatorial Rossby waves show enhanced patterns of surface convergence and precipitation that are linked to a strengthened zonally overturning circulation. During these conditions, convection is highly organized, clustering near the maximum SST gradient and ascending branch of the SST-induced overturning circulation. When the SST gradient is reduced, as occurs during periods of weak or absent oceanic equatorial Rossby waves, convection is much less organized and total rainfall is decreased. This demonstrates the previously observed upscale organization of convection and rainfall associated with oceanic downwelling equatorial Rossby waves in the western Indian Ocean. These results suggest that the enhancement of surface fluxes that results from a steepening of the SST gradient is the leading mechanism by which oceanic equatorial Rossby waves prime the atmospheric boundary layer for rapid convective development.
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      Idealized Modeling of the Atmospheric Boundary Layer Response to SST Forcing in the Western Indian Ocean

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4263656
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    contributor authorRydbeck, Adam V.
    contributor authorJensen, Tommy G.
    contributor authorIgel, Matthew R.
    date accessioned2019-10-05T06:51:46Z
    date available2019-10-05T06:51:46Z
    date copyright4/24/2019 12:00:00 AM
    date issued2019
    identifier otherJAS-D-18-0303.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263656
    description abstractAbstractThe atmospheric response to sea surface temperature (SST) variations forced by oceanic downwelling equatorial Rossby waves is investigated using an idealized convection-resolving model. Downwelling equatorial Rossby waves sharpen SST gradients in the western Indian Ocean. Changes in SST cause the atmosphere to hydrostatically adjust, subsequently modulating the low-level wind field. In an idealized cloud model, surface wind speeds, surface moisture fluxes, and low-level precipitable water maximize near regions of strongest SST gradients, not necessarily in regions of warmest SST. Simulations utilizing the steepened SST gradient representative of periods with oceanic downwelling equatorial Rossby waves show enhanced patterns of surface convergence and precipitation that are linked to a strengthened zonally overturning circulation. During these conditions, convection is highly organized, clustering near the maximum SST gradient and ascending branch of the SST-induced overturning circulation. When the SST gradient is reduced, as occurs during periods of weak or absent oceanic equatorial Rossby waves, convection is much less organized and total rainfall is decreased. This demonstrates the previously observed upscale organization of convection and rainfall associated with oceanic downwelling equatorial Rossby waves in the western Indian Ocean. These results suggest that the enhancement of surface fluxes that results from a steepening of the SST gradient is the leading mechanism by which oceanic equatorial Rossby waves prime the atmospheric boundary layer for rapid convective development.
    publisherAmerican Meteorological Society
    titleIdealized Modeling of the Atmospheric Boundary Layer Response to SST Forcing in the Western Indian Ocean
    typeJournal Paper
    journal volume76
    journal issue7
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-18-0303.1
    journal fristpage2023
    journal lastpage2042
    treeJournal of the Atmospheric Sciences:;2019:;volume 076:;issue 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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