The onset and advance of the Asian summer monsoon

• Published in: Chinese science bulletin Vol. 51; no. 1; pp. 80 - 88
• Main Authors: Lü, Junmei, Zhang, Qingyun, Tao, Shiyan, Ju, Jianhua
• Format: Journal Article
• Language: English
• Published: Graduate School of Chinese Academy of Sciences, Beijing 100039, China%State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China%China Meteorological Administration Training Centre, Beijing 100081, China 2006; Department of Atmospheric Sciences, Yunnan University, Kunming 650091, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
• Subjects: NOAA; OLR; ISEW, South China Sea; ISW, Bangladesh, Bengal Bay; ISW, Andaman Sea; Asian summer monsoon; intraseasonal variability; onset; advance
• ISSN: 1001-6538; 1861-9541
• DOI: 10.1007/s11434-005-0073-5

Based on the daily outgoing Iongwave radiation （OLR） data from National Oceanic and Atmospheric Administration （NOAA） satellites, the Cli- mate Prediction Center＇s merged analysis of precipitation （CMAP） data and the National Centers for Environmental Prediction/National Center for Atmospheric Research （NCEP/NCAR） reanalysis dataset, the mean intraseasonal variability of the Asian summer monsoon （ASM） is investigated by using power spectrum analysis, band-pass filter, and diagnostic analyses. The processes of the onset and advance of monsoon over the southern part of Indochina Peninsula, the east coast of Bay of Bengal, the South China Sea and the Indian subcontinent are explored. It is found that there is an abrupt change in OLR, precipitation and zonal wind during the onset and advance of the ASM. It is also indicated that the southern part of Indochina Peninsula and the adjacent Andaman Sea is the region where the earliest onset of the ASM occurs in the 2nd pentad of May.