Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Scientia Geographica Sinica》 2003-06
Add to Favorite Get Latest Update

Analysis of Climate Jumps in the Sanjiang Plain

Yan Min-Hua~1, Deng Wei~1, Chen Pan-Qin~2 (1.Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun, Jilin 130012; 2. Bureau of Science and Technology for Resources and Environment, Chinese Academy of Sciences, Beijing 100864)  
The Sanjiang Plain has gone through 4 periods of large-scale reclamation from 1956 to the present. Over 50% of wetlands in the region had changed into agricultural fields. The underlying surface of the plain has changed tremendously. In this paper, monthly records of 4 climatic factors (air temperature, precipitation, sunshine-hour, and wind speed) for 21 meteorological stations covering the period 1955-2000 were used. The climate jumps in the plain were examined by accumulated departure, J_y parameter and Mann-Kendall methods in the paper. Spring months defined in the paper were March-May, summer was June-September, autumn was October-November and winter was December-February of the next year. The results of seasonal and annual climate jumps showed that a jump of annual precipitation occurred in the 1960s, which had a decrease of 66.5mm; two warming jumps of annual mean temperature happened in the 1970s and the 1980s, which made the plain be different from around areas, and had the increases of 0.4℃and 1.0℃, respectively; the jumps of annual sunshine-hour and mean wind speed of the plain in the 1980s had decreased by 121.3h and 0.5m/s, respectively. The greenhouse effect and large-scale reclamation were probably direct reasons that resulted in climate jumps of the Sanjiang Plain.
【Fund】: 中国科学院知识创新工程重要方向项目(KZCX2-SW-320、KZCX2-SW-118 KZCX3-SW-NA-63);; 国家自然科学基金项目(40171017)。
【CateGory Index】: P467
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved