ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 44 Issue 9 > 2018,44(9):1191-1199. DOI:10.7519/j.issn.1000-0526.2018.09.007 Prev Next
Variations of Precipitable Water in Northwest China During 1960-2015
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Abstract:
Based on the meteorological data from 113 surface and 24 radiosonde stations in Northwest China from 1960 to 2015, the empirical formula was established between precipitable water (PWV) and surface vapor pressure, and the PWV in Northwest China was calculated. With the methods such as inverse distance weighted, MannKendall test and Morlet wavelets, the temporal and spatial distribution of PWV and its relations with other meteorological elements were analyzed. The results showed that PWV has increased in last 56 years with the increasing rate of 0.11 mm per decade, and the obviously unimodal types can be examined for the monthly variations. The high PWV area is mainly in the east of Northwest China, and the middle area of Northwest China usually presents a low value. The PWV in most parts of Northwest China has increased, which is obvious in southern Shaanxi, southeastern Gansu, northwestern Qinghai and Xinjiang. The annual average PWV in Northwest China shows an obvious mutation around 1983 and a periodical change with primary period of approximately 4 years. PWV in Northwest China shows a positive correlation with mean air temperature and relative humidity, and a negative correlation with wind speed.
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