Based on the ERA-Interim reanalysis data from 1979 to 2016 provided by the European Center for Medium-range Weather Forecast (ECMWF), the cloud water content and its water vapor transport over the Qinghai-Tibetan Plateau (QTP) in summer is analyzed. The results show that the summer cloud water content over the QTP accounts for 48% of the total year, which decreases from southeast to northwest. There are four water vapor channels affecting the cloud water content, which are the Indian Ocean channel, the South China Sea channel, the northern Bay of Bengal and the western Iranian channel (briefly called channel 1, 2, 3, 4 in order), respectively. There are obvious interannual variations of cloud water content and water vapor channel intensities. The interannual variation of cloud water content is in consistent with that of channel 2 and 4. It is shown that both the cloud water content and four channel intensities have increased trends. When the intensity of channel 1 is strong, abnormal water vapor from the northern part of the Indian Ocean and the South China Sea will convergent over the Bay of Bengal and be transported to the QTP, which mainly increases the cloud water content in the northwestern part of the QTP. When the intensity of channel 2 is strong, the anomalous southward flux over the South China Sea and the Indo-China Peninsula and the anomalous southwest flux over the northern Bay of Bengal support more water vapor to the southeastern QTP. The stronger channel 3 intensity indicates more water vapor from westerly and Indian Ocean are transported to the QTP, resulting more cloud water content in the northeastern QTP. When the intensity of channel 4 is strong, the water vapor from the South China Sea to the southern part of the Bay of Bengal is abnormally transported to the QTP, resulting more cloud water content in the central and southeastern TP. In addition, the stronger and southwestward of northwest Pacific subtropical high is consistent with stronger identities of channel 2 and 4, which is conducive to the transportation of water vapor to the QTP.
LIU Juju
,
YOU Qinglong
,
WANG Nan
. Interannual Anomaly of Cloud Water Content and Its Connection with Water Vapor Transport over the Qinghai-Tibetan Plateau in Summer[J]. Plateau Meteorology, 2019
, 38(3)
: 449
-459
.
DOI: 10.7522/j.issn.1000-0534.2018.00138
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