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    Upper-ocean Response to Precipitation Forcing in an Ocean Model Hindcast of Hurricane Gonzalo

    Source: Journal of Physical Oceanography:;2020:;volume( ):;issue: -::page 1
    Author:
    Steffen, John;Bourassa, Mark
    DOI: 10.1175/JPO-D-19-0277.1
    Publisher: American Meteorological Society
    Abstract: Pre-existing, oceanic barrier layers have been shown to limit turbulent mixing and suppress mixed layer cooling during the forced stage of a tropical cyclone (TC). Furthermore, an understanding of barrier layer evolution during TC passage is mostly unexplored. High precipitation rates within TCs provide a large freshwater flux to the surface that alters upper-ocean stratification and can act as a potential mechanism to strengthen the barrier layer. Ocean glider observations from the Bermuda Institute of Ocean Sciences (BIOS) indicate that a strong barrier layer developed during the approach and passage of Hurricane Gonzalo (2014), primarily as a result of freshening within the upper 30 m of the ocean. Therefore, an ocean model case study of Hurricane Gonzalo has been designed to investigate how precipitation affects upper-ocean stratification and sea surface temperature (SST) cooling during TC passage.Ocean model hindcasts of Hurricane Gonzalo characterize the upper-ocean response to TC precipitation forcing. Three different vertical mixing parameterizations are tested to determine their sensitivity to precipitation forcing. For all turbulent mixing schemes, TC precipitation produces near-surface freshening of about 0.3 psu, which is consistent with previous studies and in situ ocean observations. The influence of precipitation-induced changes to the SST response is more complicated, but generally modifies SSTs by ± 0.3 °C. Precipitation forcing creates a dynamical coupling between upper-ocean stratification and current shear that is largely responsible for the heterogeneous response in modeled SSTs.
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      Upper-ocean Response to Precipitation Forcing in an Ocean Model Hindcast of Hurricane Gonzalo

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4264438
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    contributor authorSteffen, John;Bourassa, Mark
    date accessioned2022-01-30T18:04:12Z
    date available2022-01-30T18:04:12Z
    date copyright9/17/2020 12:00:00 AM
    date issued2020
    identifier issn0022-3670
    identifier otherjpod190277.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4264438
    description abstractPre-existing, oceanic barrier layers have been shown to limit turbulent mixing and suppress mixed layer cooling during the forced stage of a tropical cyclone (TC). Furthermore, an understanding of barrier layer evolution during TC passage is mostly unexplored. High precipitation rates within TCs provide a large freshwater flux to the surface that alters upper-ocean stratification and can act as a potential mechanism to strengthen the barrier layer. Ocean glider observations from the Bermuda Institute of Ocean Sciences (BIOS) indicate that a strong barrier layer developed during the approach and passage of Hurricane Gonzalo (2014), primarily as a result of freshening within the upper 30 m of the ocean. Therefore, an ocean model case study of Hurricane Gonzalo has been designed to investigate how precipitation affects upper-ocean stratification and sea surface temperature (SST) cooling during TC passage.Ocean model hindcasts of Hurricane Gonzalo characterize the upper-ocean response to TC precipitation forcing. Three different vertical mixing parameterizations are tested to determine their sensitivity to precipitation forcing. For all turbulent mixing schemes, TC precipitation produces near-surface freshening of about 0.3 psu, which is consistent with previous studies and in situ ocean observations. The influence of precipitation-induced changes to the SST response is more complicated, but generally modifies SSTs by ± 0.3 °C. Precipitation forcing creates a dynamical coupling between upper-ocean stratification and current shear that is largely responsible for the heterogeneous response in modeled SSTs.
    publisherAmerican Meteorological Society
    titleUpper-ocean Response to Precipitation Forcing in an Ocean Model Hindcast of Hurricane Gonzalo
    typeJournal Paper
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-19-0277.1
    journal fristpage1
    journal lastpage50
    treeJournal of Physical Oceanography:;2020:;volume( ):;issue: -
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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