日本地球惑星科学連合2021年大会

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セッション記号 A (大気水圏科学) » A-HW 水文・陸水・地下水学・水環境

[A-HW21] 地域の気候変動適応策を支える学際研究

2021年6月5日(土) 09:00 〜 10:30 Ch.13 (Zoom会場13)

コンビーナ:手計 太一(富山県立大学)、Sompratana Ritphring(Kasetsart University)、Masashi Kiguchi(University of Tokyo)、weerakaset Suanpaga(Associate professor in Civil Engineering,Kasetsart University)、座長:手計 太一(富山県立大学)、Masashi Kiguchi(University of Tokyo)

09:45 〜 10:00

[AHW21-04] The impact of sensible heat and latent heat on monsoon onset over Indochina peninsula

Tomohito Yamada1、Ryosuke Kato1、*Sourabh Shrivastava1 (1.Hokkaido University )

キーワード:Monsoon onset, Sensible Heat, latent heat

In this study, interannual variations of the summer monsoon onset over the Indochina Peninsula were studied using the CPC Merged Analysis of Precipitation (CMAP) panted rainfall and NCEP reanalysis data from 1979 to 2016. For the climatological onset over Indochina Peninsula, 27th panted is considered. Equal numbers (9-9) of early and late monsoon onset years are identified during the last 3 decades. Sensible heat flux (Q1) and latent heat flux (Q2) influence the atmospheric circulation over the Indochina peninsula during monsoon onset. Composite analysis of Q1 and Q2 shows that the large change in Q1 and Q2 over the mainland of Indochina peninsula during early (late) monsoon years. The positive Q1 and Q2 anomalies suggest the strong convection in the early monsoon over the Indochina peninsula. It seems to be a dipole pattern over the mainland of the Indochina peninsula and the eastern Indian Ocean, where north-central Thailand have a positive (negative) anomaly and the eastern Indian Ocean have a negative (positive) anomaly during early (late) monsoon onset. Results also suggested the strong cyclonic flow at 850 hPa winds associated with the rainfall over the Indochina peninsula during early monsoon onset.