The meteorological data of 616 stations in China were used to calculate the potential evapotranspira-tion and aridity/humidity index by applying the modified FAO-Penman-Monteith model. Regional difference of trends in...The meteorological data of 616 stations in China were used to calculate the potential evapotranspira-tion and aridity/humidity index by applying the modified FAO-Penman-Monteith model. Regional difference of trends in precipitation, potential evapotranspiration and arid-ity/humidity index over China and their interdecadal varia-tions were analyzed from 1971 to 2000. The results show that all the four climatic factors trends have obvious regional difference and interdecadal variations. Annual precipitation during the 30-year period shows an increasing trend over most regions of China, with decreasing trends in potential evapotranspiration and aridity/humidity index. Most regions in China become more humid, especially significant in northern Xinjiang, eastern Tibet, western Sichuan, and northern Yunnan. The average value over China would mask the regional difference of climate change because of the com-plex environmental condition in China. Therefore regional difference should be analyzed to further understand climate change and its impacts. Both water supply and demand need to be considered when attempting to study regional arid-ity/humidity conditions.展开更多
基金This work was supported by the National Natural Science Foundation of China (Grant No. 40171040)；the KnowledgeInnovation Project of the Institute of Geographical Sciences and Natural Resources Research, CAS (Grant No. CXIOG-A02-03)； the Director Foundation of Knowledge Innovation Project of CAS (Grant No.SJ10G-A00-06).
文摘The meteorological data of 616 stations in China were used to calculate the potential evapotranspira-tion and aridity/humidity index by applying the modified FAO-Penman-Monteith model. Regional difference of trends in precipitation, potential evapotranspiration and arid-ity/humidity index over China and their interdecadal varia-tions were analyzed from 1971 to 2000. The results show that all the four climatic factors trends have obvious regional difference and interdecadal variations. Annual precipitation during the 30-year period shows an increasing trend over most regions of China, with decreasing trends in potential evapotranspiration and aridity/humidity index. Most regions in China become more humid, especially significant in northern Xinjiang, eastern Tibet, western Sichuan, and northern Yunnan. The average value over China would mask the regional difference of climate change because of the com-plex environmental condition in China. Therefore regional difference should be analyzed to further understand climate change and its impacts. Both water supply and demand need to be considered when attempting to study regional arid-ity/humidity conditions.
