Variation Characteristics of Precipitation Days with Different Phases in YangtzeHuaihe Region
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Abstract:
Based on the observation data of 106 ground weather stations during 1960-2013, the climate characteristics, intermonthly distributions, interannual variations, and longterm trends of precipitation days with five phases such as rain, snow, sleet and freezing rain are analyzed in the YangtzeHuaihe region. Then relationship between annual precipitation days of each phase and altitude is discussed. The results show that precipitation days over the YangtzeHuaihe region are the most among variphase precipitation days, which represents a spatial distribution of more in south and less in north. Contrary to the rain days, the snow days present more in north and less in south, while the sleet days presents zonal differences that precipitation days in the eastern coastal are less than those in the western inland. In the recent 54 years, the regional averaged precipitation days of each phase showed decreasing trends, in which the phases of rain, snow and sleet are significant. Looking at the spatial distribution of variation trend for each station, although the trends of precipitation days in every phase decreased, the station numbers of freezing rain reduced significantly are the least. Rains occurred mainly in March to August, while others occurred from November to the next March. In addition, the precipitation days of snow and freezing rain are most closely related to altitude positively, and the next is sleet.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.