Cause Analysis on Typical Abnormal Year of Water Vapor in the Upper Troposphere over Qinghai-Xizang Plateau

LI Minjiao;ZHANG Xueqin;XIE Chengying

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Plateau Meteorology
Plateau Meteorology ›› 2014, Vol. 33 ›› Issue (5) : 1197-1203. DOI: 10.7522/j.issn.1000-0534.2013.00111

Cause Analysis on Typical Abnormal Year of Water Vapor in the Upper Troposphere over Qinghai-Xizang Plateau

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Abstract

The variation of water vapor in the upper troposphere over the Qinghai-Xizang Plateau (QXP) plays an important role in the stratosphere-troposphere water vapor exchange. So the Atmospheric Infrared Sounder (AIRS) observations combined with NOAA global sea surface temperature (SST) observations, NCEP/NCAR reanalysis data and 74 circulation parameters from NCC are adopted to investigate the causes of the typical abnormal year of water vapor in the upper troposphere over the Tibetan Plateau during 2003-2011 from the aspect of ocean-atmosphere coupling. Analysis indicates that the ENSO events could be regarded as an indicator for the amount of water vapor in the upper troposphere over the QXP. And the water vapor in the upper troposphere increased (decreased) in summer when an El Nio (La Nia) event occurred in previous year. The atmospheric circulation anomaly forced by SST anomaly was the direct reason for the increase of the upper tropospheric water vapor over the QXP in 2010. The geopotential height in the upper troposphere became high in the summer of 2010, the blocking situation of East Asian region developed and the western Pacific subtropical high (WPSH) became stronger and extended westward, which were conducive to the transport of water vapor from the Western Pacific and the South China Sea to the QXP. In addition, the maintaining of the abnormal anticyclonic circulation over the QXP and the continuous converging of cold and warm air enhanced the upward transport of water vapor, leading to the anomaly of water vapor in the upper troposphere over the QXP in 2010.

Key words

The Qinghai-Xizang P / Water vapor in the u / Typical abnormal yea / ENSO / Atmospheric circulat

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LI Minjiao , ZHANG Xueqin , XIE Chengying. Cause Analysis on Typical Abnormal Year of Water Vapor in the Upper Troposphere over Qinghai-Xizang Plateau. Plateau Meteorology. 2014, 33(5): 1197-1203 https://doi.org/10.7522/j.issn.1000-0534.2013.00111

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