ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
InterDecadal Change of Hail Events over China and Causation Analysis in Northern China in Recent 50 Years
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Abstract:
With data of hail days at 755 stations, NCEP/NCAR monthly reanalysis and atmospheric circulation characteristics from 1958 to 2007, we have investigated the interdecadal change of hail events in China. The results indicate that the overall trend of hail events has declined remarkably since the 1980s. Most of China has a descending tendency especially in the Northeast China, North China, Northwest China and EastCentral Tibetan Plateau. According to the analysis of relation between hail events and wind fields, height fields, subtropical high, polar vortex and temperature fields, we have found that the hail event has declined significantly in northern China, which is related to the southward shift of the 200 hPa westerly jet stream, the upward elevating of the 850 hPa height field, the weakening of the subtropical high, the strengthening of the polar vortex and the shortening of the distance between 0 ℃ and -20 ℃.
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