Observed Evolution of Northward-Propagating Intraseasonal Variation over the Western Pacific: A Case Study in Boreal Early Summer

DOI PDF 被引用文献5件 オープンアクセス
  • Masaki Katsumata
    Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
  • Hiroyuki Yamada
    Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
  • Hisayuki Kubota
    Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
  • Qoosaku Moteki
    Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
  • Ryuichi Shirooka
    Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan

書誌事項

公開日
2013-02-01
DOI
  • 10.1175/mwr-d-12-00011.1
公開者
American Meteorological Society

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説明

<jats:title>Abstract</jats:title> <jats:p>This report describes the in situ observed evolution of the atmospheric profile during an event of the boreal summer intraseasonal variation (BSISV) in the tropical western Pacific Ocean. The convectively active region of the BSISV proceeded northward over the sounding and radar network. Over the array, the situation changed from a convectively inactive period to an active period. Inspection of the sounding data revealed the gradual moistening of the lower troposphere during the convectively inactive period. The sounding-derived heat and moisture budget analyses indicated that both the convective- and large-scale processes caused moistening of the lower and middle troposphere where the radar echo tops were observed most frequently. This study is the first to identify such a “preconditioning” process for the BSISV in the western Pacific using detailed in situ observational data. During the preconditioning, an increase in CAPE was observed, as in previous studies of the MJO. An increase of moisture in the boundary layer was responsible for the increase of CAPE. The large-scale horizontal convergence in the boundary layer may be a key factor to moisten the boundary layer through the convective-scale processes, as well as through the large-scale processes to moisten the lower and middle troposphere.</jats:p>

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