IFES-GCOE グローバルCOEプログラム 「統合フィールド環境科学の教育研究拠点形成」
         北海道大学大学院環境科学院/農学院環境資源学専攻

グローバルCOEプログラム「統合フィールド環境科学の教育研究拠点形成」
北海道大学大学院環境科学院/農学院環境資源学専攻

特別セミナー Special seminar by Prof. Yuqing Wang

[For English messages, please see below]

特別セミナー

日時:9月21日(金) 10:30-12:00
場所:環境科学院D棟2階  D201号室
対象者:学生・ポスドク・教員等

概要
講演者:Yuqing Wang 教授(ハワイ大学)
講演題目:
Contribution of Mesoscale Mountains over South and Southeast Asia to the East Asian Summer Monsoon Rainfall Variability
要旨:
The mesoscale mountains over East and Southeast Asia contribute significantly to the East Asian summer monsoon circulation and precipitation. In this study, a regional climate model is used to investigate the involved physical mechanisms. Several processes are revealed, including the local and remote effects and direct and indirect effects. By blocking and lifting the warm and moist air, any mesoscale mountain standing in the southwesterly monsoon flow in the lower troposphere forces upward motion and convection/precipitation on the windward side and subsidence or rain shadow on the leeward side. Diabatic heating associated the orographic rainfall can force large-scale circulation anomalies, which may enhance orographically induced rainfall on one hand and modify large-scale moisture transport on the other hand and thus inducing precipitation anomalies remotely downstream as far as 3,000 km. Although diabatic heating associated with any individual mesoscale mountain exerts a limited effect on the large-scale monsoon circulation, the ensemble of heating associated with a group of mesoscale mountains as a whole over the South and Southeast Asia are shown to contribute to the whole monsoon circulation significantly. Since such effects are asymmetric with respect to wet and dry monsoon conditions, the mesoscale mountains would thus enhance the intraseasonal and interannual variabilities of summer monsoon rainfall over East Asia.

⑥問い合わせ先:低温科学研究所・中村知裕・nakamura"at"lowtem.hokudai.ac.jp ("at"=@)

 

Special seminar by Prof. Yuqing Wang

Date: September 21 (Fri.), 10:30-12:00
Place: EES, D-201
Who can participate in?: Master and doctor course students, post-doctors, faculties, and so on
Contents:
Speaker: Prof. Yuqing Wang (Hawaii Univ.)
Title:
Contribution of Mesoscale Mountains over South and Southeast Asia to the
East Asian Summer Monsoon Rainfall Variability
Abstract:
The mesoscale mountains over East and Southeast Asia contribute
significantly to the East Asian summer monsoon circulation and
precipitation. In this study, a regional climate model is used to
investigate the involved physical mechanisms. Several processes are
revealed, including the local and remote effects and direct and indirect
effects. By blocking and lifting the warm and moist air, any mesoscale
mountain standing in the southwesterly monsoon flow in the lower troposphere
forces upward motion and convection/precipitation on the windward side and
subsidence or rain shadow on the leeward side. Diabatic heating associated
the orographic rainfall can force large-scale circulation anomalies, which
may enhance orographically induced rainfall on one hand and modify
large-scale moisture transport on the other hand and thus inducing
precipitation anomalies remotely downstream as far as 3,000 km. Although
diabatic heating associated with any individual mesoscale mountain exerts a
limited effect on the large-scale monsoon circulation, the ensemble of
heating associated with a group of mesoscale mountains as a whole over the
South and Southeast Asia are shown to contribute to the whole monsoon
circulation significantly. Since such effects are asymmetric with respect to
wet and dry monsoon conditions, the mesoscale mountains would thus enhance
the intraseasonal and interannual variabilities of summer monsoon rainfall
over East Asia.

Contact: :Tomohiro Nakamura, Institute of Low Temperature Science
(nakamura"at"lowtem.hokudai.ac.jp) "at"=@


北海道大学グローバルCOEプログラム「統合フィールド環境科学の教育研究拠点形成」