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Characteristics of the Grass Temperature Change in Shijiazhuang
ZHANG Cui-Hua, CHE Shao-Jing, BIAN Tao, YUE Yan-Xia
J4    2011, 29 (1): 17-22.  
Abstract2126)      PDF(pc) (400KB)(3732)       Save

Abstract:Based on the daily temperature observation data of 5 stations in Shijiazhuang from 2008 to 2010,the average,extreme values and daily ranges of grass land temperature,as well as relationships between grass land temperature,ground temperature and air temperature under various meteorological conditions were analyzed.The results show that annual average of grass land temperature presented low in the north and high in the south,and highest in the south-west mountainous region.The maximum of annual mean grass land temperature was highest in the central region,the minimum of annual mean grass land temperature was lowest in the southwest mountainous region.The daily range of grass land temperature was affected by latitude,season and geographical conditions,and the diurnal amplitude was biggest in the central region.The diurnal amplitude of ground temperature was maximum,but minimum for air temperature.There was a positive correlation between grass land temperature and air temperature,ground temperature in a little cloudy days.The absolute difference of annual average value between ground temperature and grass land temperature was maximum when ground was covered with snow,but minimum in rainy days.

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Temporal and Spatial Features of the First Soaking Rain in Spring in Shijiazhuang
BIAN Tao, LI Guo-Cui, SUN Yun, CHE Shao-Jing
J4    2010, 28 (2): 179-183.  
Abstract1400)      PDF(pc) (2673KB)(1837)       Save
Based on daily precipitation data of 17 stations in Shijiazhuang during 1972-2006, the spatial and temporal variation features of the first soaking rain in spring were analyzed by using the methods of EOF, REOF and linear trend, and the relations between the first soaking rain date and spring, summer rainfall using the method of correlation analysis, as well as the typical circulation features of the first soaking rain were also analyzed. Results show that the dates of the first soaking rain in spring delayed generally from southeast and northwest to the centre of the area. The unusual weather  occurs much easily in the place where the first soaking rain date is earlier or later. In recent 35 years, the first soaking rain dates were becoming earlier with a trend of 4-5 days per decade. The precipitation was generally larger (smaller) in spring and smaller (larger) in summer when the first soaking rain was earlier (later) than normal. The dominant circulation characteristics for the first soaking rain in Shijiazhuang are westerly trough and mid-troposphere vortex.
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