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    Impacts of oceanic mixed layer on hurricanes: a simulation experiment with Hurricane Sandy

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    Article (12.04Mb)
    Date
    2020-10-07
    Author
    Li, Siqi  Concept link
    Chen, Changsheng  Concept link
    Wu, Zhongxiang  Concept link
    Beardsley, Robert C.  Concept link
    Li, Ming  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/26719
    As published
    https://doi.org/10.1029/2019JC015851
    DOI
    10.1029/2019JC015851
    Keyword
     mixed layer; numerical model; hurricane; FVCOM; WRF 
    Abstract
    Influences of the ocean mixed layer (OML) dynamics on intensity, pathway, and landfall of October 2012 Hurricane Sandy were examined through an experiment using the Weather Research and Forecasting (WRF) model. The WRF model was run for two cases with or without coupling to the OML. The OML in the WRF was calculated by an oceanic mixed layer submodel. The initial conditions of the depth and mean water temperature of the OML were specified using Global‐FVCOM and Global‐HYCOM fields. The comparison results between these two cases clearly show that including the OML dynamics enhanced the contribution of vertical mixing to the air‐sea heat flux. When the hurricane moved toward the coast, the local OML rapidly deepened with an increase of storm wind. Intense vertical mixing brought cold water in the deep ocean toward the surface to produce a cold wake underneath the storm, with the lowest sea temperature at the maximum wind zone. This process led to a significant latent heat loss from the ocean within the storm and hence rapid drops of the air temperature and vapor mixing ratio above the sea surface. As a result, the storm was intensified as the central sea level pressure dropped. Improving air pressure simulation with OML tended to reduce the storm size and strengthened the storm intensity and hence provided a better simulation of hurricane pathway and landfall.
    Description
    Author Posting. © American Geophysical Union, 2020. 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 125(11), (2020): e2019JC015851, doi:10.1029/2019JC015851.
    Publisher Embargo:
    The publisher requires that this item be embargoed until 2021-04-07. Please check back after 2021-04-07.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Li, S., Chen, C., Wu, Z., Beardsley, R. C., & Li, M. (2020). Impacts of oceanic mixed layer on hurricanes: a simulation experiment with Hurricane Sandy. Journal of Geophysical Research: Oceans, 125(11), e2019JC015851.
     

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