Precipitation change characteristics and its cause based on water vapor flux change in 1979 -2016 over the Qinghai-Tibetan Plateau (QTP) was analyzed, using precipitation observation from 83 stations and upper atmospheric fields from ERA-Interim.Main conclusions are drawn as following: (1) Annual precipitation averaged over the QTP shows increasing but non-significant trend in 1979 -2016.Precipitation significantly increases with the trend of 4.25 mm·(10a)-1 in May, but significantly decreases in December.Precipitation in September decreases at first and then increases.Annual variation shows different change characteristics in different climatic regions over the QTP.According to the changes in intra-annual distribution and peak value, 11 climatic regions can be classified into three types: 3 regions with large increase in peak value including southern Tibet, southern Qinghai and Chang Tang Plateau semi-arid region, 4 regions with large change in intra-annual distribution including east Himalaya and Southeast Hengduan Mountains humid region, north central Hengduan Mountains semi-humid region and Ali arid region, 4 regions with less change including Qilian Mountains semi-arid region, Chaidamu arid region, Ruoergai humid region and Guoluo semi-humid region.(2) In the case of precipitation trend distribution, most of the stations show increasing trend over the QTP in May, particularly for the middle region with significant change.Trends in December show overall decrease.(3) The distributions of water vapor flux divergence change are in good agreement with the distributions of precipitation trends in May, September and December.Advance and enhancement of South Asia monsoon brings more humid southwesterly, making more precipitation over the QTP in May.While in December, an anomalous anticyclone exists in the East Asia at 500 hPa, resulting in intensified northerly and associated dry cold air over the QTP, which leads to less precipitation.
Jianwei XU
,
Yanhong GAO
,
Baofa PENG
,
Xiaqing WANG
. Change Characteristics of Precipitation and its Cause During 1979 -2016over the Qinghai-Tibetan Plateau[J]. Plateau Meteorology, 2020
, 39(2)
: 234
-244
.
DOI: 10.7522/j.issn.1000-0534.2019.00029
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