Interdecadal change of atmospheric stationary waves and North China drought

doi:10.1088/1009-1963/14/4/038

中国物理B ›› 2005, Vol. 14 ›› Issue (4): 850-858.doi: 10.1088/1009-1963/14/4/038

Interdecadal change of atmospheric stationary waves and North China drought

符淙斌¹, 汪萍¹, 戴新刚²

(1)Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; (2)Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China;College of Atmospheric Sciences, Lanzhou University,Lanzhou,730000, China

收稿日期:2004-10-21 修回日期:2004-11-26 出版日期:2005-04-20 发布日期:2005-03-28
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No 49875024) and China Postdoctoral Science Foundation (No 2004035074) and K. C. Wong Education Foundation, Hong Kong.

Interdecadal change of atmospheric stationary waves and North China drought

Dai Xin-Gang (戴新刚)^ab, Fu Cong-Bin (符淙斌)^a, Wang Ping (汪萍)^a

^a Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; ^b College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China

Received:2004-10-21 Revised:2004-11-26 Online:2005-04-20 Published:2005-03-28
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No 49875024) and China Postdoctoral Science Foundation (No 2004035074) and K. C. Wong Education Foundation, Hong Kong.

摘要/Abstract

摘要： The inderdecadal change of atmospheric stationary waves (ATW) has been investigated for the two periods 1956--77 and 1978--99. The trough of ATW in the middle and low layer of the troposphere over the Asian continent has experienced a significant weakening during the past two decades, which exerts a great influence on the North China climate. The ATW in 200\,hPa has also exhibited some changes since 1977, as a stationary ridge appeared over the northwestern China while a stationary trough appeared above North China. This leads to an increasing of the upward motion above northwestern China and a decreasing above North China. A west--east section of the stationary waves at 40$^\circ$N shows that the ATW above North China tilted westward for the period 1956--77, but was almost upright during 1978--99. The composite analysis confirms that the climate mean ATW pattern after 1977 is similar to the dry pattern for North China, while the rainy pattern is similar to that before 1977. In consequence, the North China drought is partly due to the interdecadal change of the ATW over boreal Asia in the recent two decades.

关键词: atmospheric stationary wave, North China drought, interdecadal change, dry and rainy climate pattern

Abstract: The inderdecadal change of atmospheric stationary waves (ATW) has been investigated for the two periods 1956--77 and 1978--99. The trough of ATW in the middle and low layer of the troposphere over the Asian continent has experienced a significant weakening during the past two decades, which exerts a great influence on the North China climate. The ATW in 200 hPa has also exhibited some changes since 1977, as a stationary ridge appeared over the northwestern China while a stationary trough appeared above North China. This leads to an increasing of the upward motion above northwestern China and a decreasing above North China. A west--east section of the stationary waves at 40$^\circ$N shows that the ATW above North China tilted westward for the period 1956--77, but was almost upright during 1978--99. The composite analysis confirms that the climate mean ATW pattern after 1977 is similar to the dry pattern for North China, while the rainy pattern is similar to that before 1977. In consequence, the North China drought is partly due to the interdecadal change of the ATW over boreal Asia in the recent two decades.

Key words: atmospheric stationary wave, North China drought, interdecadal change, dry and rainy climate pattern

中图分类号: (Climatology, climate change and variability)

92.60.Ry

92.60.Jq (Water in the atmosphere) 92.60.H- (Atmospheric composition, structure, and properties) 93.30.Db (Asia)

戴新刚, 符淙斌, 汪萍. Interdecadal change of atmospheric stationary waves and North China drought[J]. 中国物理B, 2005, 14(4): 850-858.

Dai Xin-Gang (戴新刚), Fu Cong-Bin (符淙斌), Wang Ping (汪萍). Interdecadal change of atmospheric stationary waves and North China drought[J]. Chinese Physics, 2005, 14(4): 850-858.

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Interdecadal change of atmospheric stationary waves and North China drought

Interdecadal change of atmospheric stationary waves and North China drought

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