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    Real World and Tropical Cyclone World. Part II: Sensitivity of Tropical Cyclone Formation to Uniform and Meridionally Varying Sea Surface Temperatures under Aquaplanet Conditions

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    Author
    Walsh, KJE; Sharmila, S; Thatcher, M; Wales, S; Utembe, S; Vaughan, A
    Date
    2020-02-01
    Source Title
    Journal of Climate
    Publisher
    AMER METEOROLOGICAL SOC
    University of Melbourne Author/s
    Walsh, Kevin; Sur, Sharmila; Wales, Scott
    Affiliation
    School of Earth Sciences
    Metadata
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    Document Type
    Journal Article
    Citations
    Walsh, K. J. E., Sharmila, S., Thatcher, M., Wales, S., Utembe, S. & Vaughan, A. (2020). Real World and Tropical Cyclone World. Part II: Sensitivity of Tropical Cyclone Formation to Uniform and Meridionally Varying Sea Surface Temperatures under Aquaplanet Conditions. JOURNAL OF CLIMATE, 33 (4), pp.1473-1486. https://doi.org/10.1175/JCLI-D-19-0079.1.
    Access Status
    Access this item via the Open Access location
    URI
    http://hdl.handle.net/11343/254023
    DOI
    10.1175/JCLI-D-19-0079.1
    Open Access URL
    http://eprints.usq.edu.au/37975/1/Walsh_etal_ACCESS-Part2_JClim_2020.pdf
    Abstract
    <jats:title>Abstract</jats:title><jats:p>This study aims to investigate the response of simulated tropical cyclone formation to specific climate conditions, using an idealized aquaplanet framework of an ~40-km-horizontal-resolution atmospheric general circulation model. Two sets of idealized model experiments have been performed, one with a set of uniformly distributed constant global sea surface temperatures (SSTs) and another in which varying meridional SST gradients are imposed. The results show that the strongest relationship between climate and tropical cyclone formation is with vertical static stability: increased static stability is strongly associated with decreased tropical cyclone formation. Vertical wind shear and midtropospheric vertical velocity also appear to be related to tropical cyclone formation, although below a threshold value of wind shear there appears to be little relationship. The relationship of tropical cyclone formation with maximum potential intensity and mean sea surface temperature is weak and not monotonic. These simulations strongly suggest that vertical static stability should be part of any climate theory of tropical cyclone formation.</jats:p>

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