Study on Water Vapor Characteristic of Typical Heavy Snowstorm Case in Northern Xinjiang

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Plateau Meteorology
Plateau Meteorology ›› 2013, Vol. 32 ›› Issue (4) : 1115-1125. DOI: 10.7522/j.issn.1000-0534.2012.00105

Study on Water Vapor Characteristic of Typical Heavy Snowstorm Case in Northern Xinjiang

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Abstract

Using the daily precipitation at 51 weather stations in the Northern Xinjiang from November to March during 2000—2012 and daily water vapor of NCEP/NCAR 6 h 1°×1° reanalysis data, the water vapor characteristics of 11 typical heavy snowstorm cases were studied. The result shows that the 11 cases are classified into 3 types: West of Northern Xinjiang and along Tianshan edge, north and east of Northern Xinjiang, west of Northern Xinjiang and west Tianshan. There are two main water vapor sources: Near the Mediterranean Sea, the Red Sea or near the Persian Gulf. There are two water vapor transport routes which are west, southwest and northwest, respectively. Water vapor from southwest route is more, that from northwest route is less. The top of water vapor is close to 300 hPa. The strongest water vapor transport level is between 650～750 hPa. Before the every occurrence of 11 heavy snowstorm processes, there are water vapor convergence between 600～1 000 hPa in Northern Xinjiang.There are positive correlations between the snowstorm intensity and water vapor convergence between 600～1 000 hPa, as well as the convergence strength, rang and duration time in Northern Xinjiang. Hence, some lowest values of the strongest water vapor transport, water vapor convergence and the upper and lower level jet streams are resented also and gave useful references for accurate heavy snowstorm forecasting.

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Heavy snowstorm / Water vapor characte / Northern Xinjiang

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. Study on Water Vapor Characteristic of Typical Heavy Snowstorm Case in Northern Xinjiang. Plateau Meteorology. 2013, 32(4): 1115-1125 https://doi.org/10.7522/j.issn.1000-0534.2012.00105

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