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Editorial Type:
Article
Article Type:
Research Article

Robust Response of the East Asian Monsoon Rainband to Solar Variability

Liang Zhao1 and Jing-Song Wang1
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  • 1 National Center for Space Weather, Beijing, China
Print Publication:
15 Apr 2014
DOI:
https://doi.org/10.1175/JCLI-D-13-00482.1
Page(s):
3043–3051
Restricted access

Abstract

This study provides evidence of the robust response of the East Asian monsoon rainband to the 11-yr solar cycle and first identify the exact time period within the summer half-year (1958–2012) with the strongest correlation between the mean latitude of the rainband (MLRB) over China and the sunspot number (SSN). This period just corresponds to the climatological-mean East Asian mei-yu season, characterized by a large-scale quasi-zonal monsoon rainband (i.e., 22 May–13 July). Both the statistically significant correlation and the temporal coincidence indicate a robust response of the mei-yu rainband to solar variability during the last five solar cycles. During the high SSN years, the mei-yu MLRB lies 1.2° farther north, and the amplitude of its interannual variations increases when compared with low SSN years. The robust response of monsoon rainband to solar forcing is related to an anomalous general atmospheric pattern with an up–down seesaw and a north–south seesaw over East Asia.

Corresponding author address: Jing-Song Wang, National Center for Space Weather, China Meteorological Administration, No. 46 Zhongguancun South Street, 100081 Beijing, China. E-mail: wangjs@cma.gov.cn

Abstract

This study provides evidence of the robust response of the East Asian monsoon rainband to the 11-yr solar cycle and first identify the exact time period within the summer half-year (1958–2012) with the strongest correlation between the mean latitude of the rainband (MLRB) over China and the sunspot number (SSN). This period just corresponds to the climatological-mean East Asian mei-yu season, characterized by a large-scale quasi-zonal monsoon rainband (i.e., 22 May–13 July). Both the statistically significant correlation and the temporal coincidence indicate a robust response of the mei-yu rainband to solar variability during the last five solar cycles. During the high SSN years, the mei-yu MLRB lies 1.2° farther north, and the amplitude of its interannual variations increases when compared with low SSN years. The robust response of monsoon rainband to solar forcing is related to an anomalous general atmospheric pattern with an up–down seesaw and a north–south seesaw over East Asia.

Corresponding author address: Jing-Song Wang, National Center for Space Weather, China Meteorological Administration, No. 46 Zhongguancun South Street, 100081 Beijing, China. E-mail: wangjs@cma.gov.cn
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