Spatial and Temporal Distributions of Severe Convective Events and Statistical Characteristics of Convection Parameters over the Southern Part of Hebei Province
Abstract: Using the observational thunderstorm, thunderstorm gale, hail and rainstorm data at 50 meteorological sta-tions in Xingtai, Shijiazhuang, Handan Districts of Hebei Province, China, and the convection parameters drawn from the MICAPS3 system during 1999-2008, spatial and temporal distributions of the severe convective events and several convective parameters have been analyzed. It has been shown that, on average, there are 74.8 thunderstorm days in a year over South Hebei, including 28.2 thunderstorm gale days, 9.4 hail days, and 12.3 rainstorm days. Strong convec-tive weather does not appear in January, February and December. Most thunderstorm and heavy rain events appear in July, and most thunderstorm gale and hail appear in June. Strong convective weather usually occurs in the afternoon. Apparently, compared to the eastern part, more thunderstorm and hail events appear in the western region of the study area. Thunderstorm gales often appear in the central part, and the heavy rain events in the northwestern and southeastern parts. For the strong convective weather, the thermal and energy convection parameters, such as TT, K, T850~500 and CAPE, are all numerically higher. But the parameter of T850~500 for rainstorm is relatively small, indicating that the rain-storm occurrence is not caused by any strong vertical temperature variation. The dynamical parameter of the strong weather threaten index is always showing a larger value, but the Switzerland thunderstorm index always appears to be smaller, indicating those power parameters may be used as reference indexes to forecast strong convection potential. The small SI stability index (no larger than 1) and large θse850~500 (no less than 5) can always characterize the strong convection events. In addition, the convection-condensation height is lower, that is, the CCL value is larger for thunder-storm, hail and heavy rain events, but higher for thunderstorm gales. The heights where the temperature reaches 0 and −20 Degrees Celsius can be regarded as characterized heights for hail. The parameters show that convection seems to be stronger in July than in other months.
文章引用: 王丛梅 , 李国翠 , 田秀霞 , 杨允凌 (2013) 河北省南部强对流天气的时空分布及对流参数统计特征。 气候变化研究快报， 2， 39-45. doi: 10.12677/CCRL.2013.21007
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