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# An Abrupt Rainfall Decrease over the Asian Inland Plateau Region around 1999 and the Possible Underlying Mechanism

• A decadal change in summer rainfall in the Asian inland plateau (AIP) region is identified around 1999. This decadal change is characterized by an abrupt decrease in summer rainfall of about 15.7% of the climatological average amount, leading to prolonged drought in the Asian inland plateau region. Both the surface air temperature and potential evapotranspiration in the AIP show a significant increase, while the soil moisture exhibits a decrease, after the late 1990s. Furthermore, the normalized difference vegetation index shows an apparent decreasing trend during 1999-2007. Three different drought indices——the standardized precipitation index, the standardized precipitation evapotranspiration index, and the self-calibrating Palmer drought severity index——present pronounced climate anomalies during 1999-2007, indicating dramatic drought exacerbation in the region after the late 1990s. This decadal change in the summer rainfall may be attributable to a wave-like teleconnection pattern from Western Europe to Asia. A set of model sensitivity experiments suggests that the summer warming sea surface temperature in the North Atlantic could induce this teleconnection pattern over Eurasia, resulting in recent drought in the AIP region.

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## Manuscript History

Manuscript received: 25 May 2016
Manuscript revised: 07 September 2016
Manuscript accepted: 06 October 2016
###### 通讯作者: 陈斌, bchen63@163.com
• 1.

沈阳化工大学材料科学与工程学院 沈阳 110142

## An Abrupt Rainfall Decrease over the Asian Inland Plateau Region around 1999 and the Possible Underlying Mechanism

• 1. Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190, China
• 2. School of Earth Science, University of the Chinese Academy of Sciences, Beijing 100049, China
• 3. Department of Atmospheric Sciences, Pusan National University, Pusan 609-735, Korea
• 4. Russian State Hydrometeorological University, St. Petersburg 195196, Russia

Abstract: A decadal change in summer rainfall in the Asian inland plateau (AIP) region is identified around 1999. This decadal change is characterized by an abrupt decrease in summer rainfall of about 15.7% of the climatological average amount, leading to prolonged drought in the Asian inland plateau region. Both the surface air temperature and potential evapotranspiration in the AIP show a significant increase, while the soil moisture exhibits a decrease, after the late 1990s. Furthermore, the normalized difference vegetation index shows an apparent decreasing trend during 1999-2007. Three different drought indices——the standardized precipitation index, the standardized precipitation evapotranspiration index, and the self-calibrating Palmer drought severity index——present pronounced climate anomalies during 1999-2007, indicating dramatic drought exacerbation in the region after the late 1990s. This decadal change in the summer rainfall may be attributable to a wave-like teleconnection pattern from Western Europe to Asia. A set of model sensitivity experiments suggests that the summer warming sea surface temperature in the North Atlantic could induce this teleconnection pattern over Eurasia, resulting in recent drought in the AIP region.

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