Analysis of the spatial variation of the climatic factors in Songnen Plain during the last century(1901-2000)
MA Yan-min1,ZHANG Li-juan2,MA Jun1,CHU Zheng1(1 Key Laboratory of Geographic Environment Remote Sensing Monitoring of Colleges and Universities in Heilongjiang,Harbin 150025,China;2 Key Laboratory of Regional Climate-Environment for East Asia,Chinese Academy of Sciences,Beijing 100029,China)
The paper would like to introduce our analysis of the temporal and spatial characteristics of the climate changes in Song-Nen River Plain during the last century(1901-2000) by using the CRU data of climatic variations,including the monthly average temperature,the precipitation and vapor pressure.Applying Arc-GIS software,Kriging Interpolation Method and Surface Analysis for arranging,analyzing and presentation of the CRU climate data,we have done a large-scale analysis of the above topic with its focus on the spatial-temporal variation analysis.Conclusion has been drawn,showing the increase of the precipitation,temperature and vapor pressure as well as the climatic trend of getting wetter and warmer in the plain during the said period.Specific regional and seasonal changes can be shown as follows:(1) There was an obvious increasing trend of the air temperature in the Plain from 1901 to 2000,with the range variation of 1.46-1.86 ℃.The ascending trend has been found more remarkable in the west,east,south border areas,though minor temperature rising in the northern area.For the four seasons,the air temperature in the plain tends to increase most obviously,particularly in winter,followed by spring.(2) Precipitation has generally been rising with the range of 11-114 mm in the Plain during the same period,indicating the spatial increasing trend from the west to the east.For the four seasons in a year,most obvious precipitation increase has been found in Autumn,followed by Winter,whereas obvious common decreasing trend of precipitation take place in Spring and remain basically stable in Summer.(3) There has been an obvious increasing trend of vapor pressure in the river reach during the same period,along with the vapor pressure distribution varied regionally and seasonally,which has been increasing from the north to the south.In addition,for the four seasons,vapor pressure has all increased during the last century,whose vapor pressure change is most obvious in winter,and next in spring.