The spatial and temporal distributions of atmospheric precipitable water and precipitation conversion efficiency in Inner Mongolia region were analised by using the NCEP/NCAR reanalysis data and monthly precipitation data of 119 stations from 1961 to 2015. The results show that:(1) The average of atmospheric precipitable water in Inner Mongolia region is 8~14 mm. The atmospheric precipitable water is gradually decreasing from south to north and from east to west. The interannual variation showed a decreasing trend in recent 65 years. Influenced by front activities and the abrupt change of atmospheric circulation, there were two times of sudden growth in April and June, and one time of sudden reduction from October to November. (2) The number of water cycle in Inner Mongolia region is the highest in summer, the second in spring or autumn, and the lowest in winter, which is decreasing from northeast to southwest, and the interannual variation shows an increasing trend. (3) The main path of water transportation in Inner Mongolia region is westerly, but the southerly transportation directly lead to the increase of precipitation and water cycle. (4) Seasonal water vapor input is less than the output, which leads to an imbalance of water vapor in Inner Mongolia region. (5) The spatial distribution of water vapor flux divergence is consistent with the spatial distribution of water cycle, indicating that the number of water cycles can objectively reflect the transformation of precipitable water vapor.
WANG Huiqing
,
FU Yanan
,
BAO Fuxiang
,
MENG Xuefeng
. Study on Atmospheric Precipitable Water and Precipitation Conversion Efficiency of Muti-Year in Inner Mongolia[J]. Plateau Meteorology, 2018
, 37(3)
: 786
-795
.
DOI: 10.7522/j.issn.1000-0534.2017.00077
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