Environmental Conditions for Tropical Cyclogenesis Associated with African Easterly Waves

DOI Web Site 被引用文献2件 参考文献25件 オープンアクセス
  • Satoh Masaki
    Atmosphere and Ocean Research Institute, The University of Tokyo Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology
  • Nihonmatsu Ryosuke
    Atmosphere and Ocean Research Institute, The University of Tokyo
  • Kubokawa Hiroyasu
    Atmosphere and Ocean Research Institute, The University of Tokyo

書誌事項

公開日
2013
DOI
  • 10.2151/sola.2013-027
公開者
公益社団法人 日本気象学会

説明

The factors of tropical cyclone (TC) genesis that are associated with African easterly waves (AEWs) were analyzed. We detected AEWs that passed over the West African coast (WAC) using ERA-interim data from July to September 2000-2010 and examine differences between the characteristics of AEWs that either develop or do not develop TCs. We first examined the environmental conditions of the AEWs that develop TCs and their dependencies on genesis location. We found that the mid-level relative humidity near the WAC is most strongly related to the genesis location among the factors contributing to TC genesis. Composite maps of the AEWs show that wave trains at 600 hPa are west-north-westward for AEWs that develop TCs and westward for non-developing AEWs. The location of maximum of water vapor at 400 hPa coincides with the stream function center for cases of TC development, while it is shifted to the southeast for cases of non-development. We focused on a case of a non-developing AEW with high relative humidity near the WAC, and found that, among other possible suppression mechanisms, a dry shallow vortex originating from the Sahara Desert had an additional effect of suppressing TC genesis.

収録刊行物

  • SOLA

    SOLA 9 (0), 120-124, 2013

    公益社団法人 日本気象学会

被引用文献 (2)*注記

もっと見る

参考文献 (25)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ