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    The role of air–sea interactions in atmospheric rivers: Case studies using the SKRIPS regional coupled model

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    Name:
    2020JD032885.pdf
    Size:
    10.65Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2021-08-13
    Download
    Type
    Article
    Authors
    Sun, Rui cc
    Subramanian, Aneesh C.
    Cornuelle, Bruce D.
    Mazloff, Matthew R. cc
    Miller, Arthur J. cc
    Ralph, F. Martin cc
    Seo, Hyodae cc
    Hoteit, Ibrahim cc
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2021-02-13
    Embargo End Date
    2021-08-13
    Submitted Date
    2020-04-06
    Permanent link to this record
    http://hdl.handle.net/10754/667371
    
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    Abstract
    Atmospheric rivers (ARs) play a key role in California’s water supply and are responsible for most of the extreme precipitation and major flooding along the west coast of North America. Given the high societal impact, it is critical to improve our understanding and prediction of ARs. This study uses a regional coupled ocean–atmosphere modeling system to make hindcasts of ARs up to 14 days. Two groups of coupled runs are highlighted in the comparison: (1) ARs occurring during times with strong SST cooling and (2) ARs occurring during times with weak SST cooling. During the events with strong SST cooling, the coupled model simulates strong upward air–sea heat fluxes associated with ARs; on the other hand, when the SST cooling is weak, the coupled model simulates downward air–sea heat fluxes in the AR region. Validation data shows that the coupled model skillfully reproduces the evolving SST, as well as the surface turbulent heat transfers between the ocean and atmosphere. The roles of air–sea interactions in AR events are investigated by comparing coupled model hindcasts to hindcasts made using persistent sea surface temperature (SST). To evaluate the influence of the ocean on ARs we analyze two representative variables of AR intensity, the vertically integrated water vapor (IWV) and integrated vapor transport (IVT). During strong SST cooling AR events the simulated IWV is improved by about 12% in the coupled run at lead times greater than one week. For IVT, which is about twice more variable, the improvement in the coupled run is about 5%.
    Citation
    Sun, R., Subramanian, A. C., Cornuelle, B. D., Mazloff, M. R., Miller, A. J., Ralph, F. M., … Hoteit, I. (2021). The role of air–sea interactions in atmospheric rivers: Case studies using the SKRIPS regional coupled model. Journal of Geophysical Research: Atmospheres. doi:10.1029/2020jd032885
    Publisher
    American Geophysical Union (AGU)
    Journal
    Journal of Geophysical Research: Atmospheres
    DOI
    10.1029/2020jd032885
    Additional Links
    https://onlinelibrary.wiley.com/doi/10.1029/2020JD032885
    ae974a485f413a2113503eed53cd6c53
    10.1029/2020jd032885
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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