摘要
Using the data observed by 62 Chinese Routine Meteorological Stations (CRMS) with long term radiation observation, the climatic trends and the relationship between pan-evaporation and its environmental factors are analyzed comprehensively. The results show that during the last 40 years, the relative humidity is uptrend in west China, downtrend in east China, and their extrema are 0.20%/a and ?0.22%/a respectively; the precipitations of about 61% CRMS keep uptrend, its maximum can reach 10.52 mm/a2 while the cloud amounts of about 79% CRMS keep downtrend slightly. About 98% CRMS display the air temperature uptrend, and the maximum is 0.11℃/a. About 76% CRMS display the land surface temperature uptrend. About 87% CRMS show the daily range of temperature downtrend. The global radiations observed by about 85% CRMS and the 10 m wind speeds observed by about 77% CRMS hold downtrend. The annual pan-evaporations of about 66% CRMS hold descend trend, and the biggest descent reaches ?24.9 mm/a2. The pan-evaporation has good relationship with many environmental factors, but the relationship with the relative humidity is the best. All of the climatic trends respond to the global climate changes.
Using the data observed by 62 Chinese Routine Meteorological Stations (CRMS)with long term radiation observation, the climatic trends and the relationship betweenpan-evaporation and its environmental factors are analyzed comprehensively. The results show thatduring the last 40 years, the relative humidity is uptrend in west China, downtrend in east China,and their extrema are 0.20 percent/a and -0.22 percent/a respectively; the precipitations of about61 percent CRMS keep uptrend, its maximum can reach 10.52 mm/a^2 while the cloud amounts of about 79percent CRMS keep downtrend slightly. About 98 percent CRMS display the air temperature uptrend,and the maximum is 0.11 deg C/a. About 76 percent CRMS display the land surface temperature uptrend.About 87 percent CRMS show the daily range of temperature downtrend. The global radiations observedby about 85 percent CRMS and the 10 m wind speeds observed by about 77 percent CRMS hold downtrend.The annual pan-evaporations of about 66 percent CRMS hold descend trend, and the biggest descentreaches -24.9 mm/a^2. The pan-evaporation has good relationship with many environmental factors, butthe relationship with the relative humidity is the best. All of the climatic trends respond to theglobal climate changes.
基金
supported by the Knowledge lnnovation Program of the Chinese Academy of Sciences(Grant No.KZCX1-SW-04)
the Knowledge Innovation Foundation of Cold and And Regions Environmental and Engineering Reseatch Institute(CA-REERI)
the Chinese Academy of Sciences(Grant No.CACX2004117).
关键词
气候变化
蒸发作用
环境因素
中国
climate change
pan
pan-evaporation
trend
environmental factor
