理想化シミュレーションにおける熱帯低気圧発生におよぼす上層高気圧と下層低気圧の効果の比較

DOI Web Site Web Site 参考文献46件
  • CAO Xi
    Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, China State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, China Shanghai Typhoon Institute, China Meteorological Administration, China
  • WU Renguang
    Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, China School of Earth Sciences, Zhejiang University, China
  • DAI Yifeng
    Tongji Zhejiang College, China
  • XU Jing
    State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, China

書誌事項

タイトル別名
  • A Comparison of the Effects of an Upper-Level Anticyclone and a Lower-Level Cyclone on Tropical Cyclogenesis in Idealized Simulations

この論文をさがす

抄録

<p>This study examined the effects of an upper-level anticyclonic circulation and a lower-level cyclonic circulation on tropical cyclone (TC) genesis. We ran idealized simulations using the Advanced Research Weather Research and Forecasting (WRF-ARW) model. The simulation results show that the upper-level anticyclonic circulation makes a negative contribution to TC genesis, while the lower-level cyclonic circulation makes a positive contribution. The upper-level anticyclonic circulation results in slower TC genesis due to a substantial vertical zonal wind shear that shifts the upper-level vortex eastward from its initial position. This shift is unfavorable for the vortex's vertical alignment and warm core maintenance. This substantial vertical zonal wind shear is associated with the asymmetric vertical motion and associated diabatic heating, induced by the lower-level beta gyre. The upper-level anticyclonic circulation increases the westerly wind north of the vortex, resulting in a substantial vertical westerly wind shear. Thus, the initial upper-level anticyclonic circulation is unnecessary for TC genesis. The strong upper-level anticyclonic circulation, generally observed with a strong TC, should be considered a result of deep convection. The strong lower-level winds induce large surface heat fluxes and vorticity due to the superposition of the large-scale lower-level cyclonic circulation and vortex. These conditions lead to strengthened convection and diabatic heating and a quick build-up of positive vorticity, resulting in rapid TC genesis.</p>

収録刊行物

  • 気象集誌. 第2輯

    気象集誌. 第2輯 98 (5), 1005-1027, 2020

    公益社団法人 日本気象学会

参考文献 (46)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ