https://scholars.lib.ntu.edu.tw/handle/123456789/571799
標題: | The impact of outer-core surface heat fluxes on the convective activities and rapid intensification of tropical cyclones | 作者: | Peng C.-H CHUN-CHIEH WU |
關鍵字: | Correlation methods; Hurricanes; Storms; Tropics; Control experiments; Heating efficiencies; Numerical experiments; Partial correlation; Positive correlations; Potential vorticity; Rapid intensification; Surface heat fluxes; Heat flux; atmospheric convection; correlation; heat flux; outer core; potential vorticity; tropical cyclone | 公開日期: | 2020 | 卷: | 77 | 期: | 11 | 起(迄)頁: | 3907-3927 | 來源出版物: | Journal of the Atmospheric Sciences | 摘要: | The rapid intensification (RI) of Typhoon Soudelor (2015) is simulated using a full-physics model. To investigate how the outer-core surface heat fluxes affect tropical cyclone (TC) structure and RI processes, a series of numerical experiments are performed by suppressing surface heat fluxes between various radii. It is found that a TC would become quite weaker when the surface heat fluxes are suppressed outside the radius of 60 or 90 km [the radius of maximum surface wind in the control experiment (CTRL) at the onset of RI is roughly 60 km]. However, interestingly, the TC would experience stronger RI when the surface heat fluxes are suppressed outside the radius of 150 km. For those sensitivity experiments with capped surface heat fluxes, the members with greater intensification rate show stronger inner-core mid- to upper-level updrafts and higher heating efficiency prior to the RI periods. Although the outer-core surface heat fluxes in these members are suppressed, the inner-core winds become stronger, extracting more ocean energy from the inner core. Greater outer-core low-level stability in these members results in aggregation of deep convection and subsequent generation and concentration of potential vorticity inside the inner core, thus confining the strongest winds therein. The abovementioned findings are also supported by partial-correlation analyses, which reveal the positive correlation between the inner-core convection and subsequent 6-h intensity change, and the competition between the inner-core and outer-core convections (i.e., eyewall and outer rainbands). ? 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses). |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85096934015&doi=10.1175%2fJAS-D-19-0348.1&partnerID=40&md5=115fa68e92f69aa5a254b2d3847196cc https://scholars.lib.ntu.edu.tw/handle/123456789/571799 |
ISSN: | 224928 | DOI: | 10.1175/JAS-D-19-0348.1 |
顯示於: | 大氣科學系 |
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