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, Jy 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.
Yan Min-Hua, Deng Wei, Chen Pan-Qin
. Analysis of Climate Jumps in the Sanjiang Plain[J]. SCIENTIA GEOGRAPHICA SINICA, 2003
, 23(6)
: 661
-667
.
DOI: 10.13249/j.cnki.sgs.2003.06.661
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