Using Lanczos filtered simulation results from the ECHO-G coupled ocean-atmosphere model,this study analyzes the spatiotemporal structure of temperature and precipitation on centennial time scale to examine how climat...Using Lanczos filtered simulation results from the ECHO-G coupled ocean-atmosphere model,this study analyzes the spatiotemporal structure of temperature and precipitation on centennial time scale to examine how climate change in eastern China responded to external forcing during the last millennium.The conclusions are (1) eastern China experienced a warm-cold-warm climate transition,and the transition from the warm period to the cold period was slower than the cold to warm transition which followed it.There was more rainfall in the warm periods,and the transitional peak and valley of precipitation lag those of temperature.The effective solar radiation and solar irradiance have significant impacts on the temporal variation of both temperature and precipitation.Volcanic activity plays an important role in the sudden drop of temperature before the Present Warm Period (PWP).There is a positive correlation between precipitation and volcanic activity before 1400 A.D.,and a negative relationship between the two thereafter.The concentration of greenhouse gases increases in the PWP,and the temperature and precipitation increase accordingly.(2) The spatial pattern of the first leading empirical orthogonal function (EOF) mode of temperature on centennial time scale is consistent with that on the inter-annual/inter-decadal (IA-ID) time scales;namely,the entirety of eastern China is of the same sign.This pattern has good coherence with effective solar radiation and the concentrations of greenhouse gases.The first leading EOF mode of precipitation on centennial time scale is totally different from that on the IA-ID time scales.The first leading mode of centennial time scale changes consistently over the entirety of eastern China,while the middle and lower reaches of the Yangtze and Yellow Rivers are the opposite to the rest of eastern China is the leading spatial pattern on IA-ID time scale.The distribution of precipitation on centennial time scale is affected by solar irradiance and greenhouse gas concentrations.展开更多
A zonal domain primitive equation modeling system(ZDMS)is used to study the effects of the initial heating anomalies over the Tibetan Plateau and the western Pacific on the East Asian and the Chinese summer climate,th...A zonal domain primitive equation modeling system(ZDMS)is used to study the effects of the initial heating anomalies over the Tibetan Plateau and the western Pacific on the East Asian and the Chinese summer climate,the relative importance and the mechanisms are discussed.Results show that in spite of the different locations of the heating anomalies the influences of the two anomaly areas are much similar to each other when the scaling of the two areas is the same.The two areas of heating anomalies have their own affecting domains in which one is more important than the oth- er.In the western Pacific the heating anomaly over the western Pacific is more evident and in the Tibetan Plateau area the heating anomaly over the Tibetan Plateau is more obvious.For the east part of China the effects of the two heating anomalies both exist and almost have the equal impor- tance.The initial anomaly of the sea surface temperature(SST)over the western Pacific can be kept during the entire time integration while in the Tibetan Plateau it can not be maintained.展开更多
基金supported by the Strategic and Special Frontier Project of Science and Technology of the Chinese Academy of Sciences (XDA05080800)the National Basic Research Program of China (2010CB950102,2010CB833404 and 2011CB403301)+1 种基金the National Natural Science Foundation of China (40871007 and 40890054)the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-337)
文摘Using Lanczos filtered simulation results from the ECHO-G coupled ocean-atmosphere model,this study analyzes the spatiotemporal structure of temperature and precipitation on centennial time scale to examine how climate change in eastern China responded to external forcing during the last millennium.The conclusions are (1) eastern China experienced a warm-cold-warm climate transition,and the transition from the warm period to the cold period was slower than the cold to warm transition which followed it.There was more rainfall in the warm periods,and the transitional peak and valley of precipitation lag those of temperature.The effective solar radiation and solar irradiance have significant impacts on the temporal variation of both temperature and precipitation.Volcanic activity plays an important role in the sudden drop of temperature before the Present Warm Period (PWP).There is a positive correlation between precipitation and volcanic activity before 1400 A.D.,and a negative relationship between the two thereafter.The concentration of greenhouse gases increases in the PWP,and the temperature and precipitation increase accordingly.(2) The spatial pattern of the first leading empirical orthogonal function (EOF) mode of temperature on centennial time scale is consistent with that on the inter-annual/inter-decadal (IA-ID) time scales;namely,the entirety of eastern China is of the same sign.This pattern has good coherence with effective solar radiation and the concentrations of greenhouse gases.The first leading EOF mode of precipitation on centennial time scale is totally different from that on the IA-ID time scales.The first leading mode of centennial time scale changes consistently over the entirety of eastern China,while the middle and lower reaches of the Yangtze and Yellow Rivers are the opposite to the rest of eastern China is the leading spatial pattern on IA-ID time scale.The distribution of precipitation on centennial time scale is affected by solar irradiance and greenhouse gas concentrations.
基金Supported by the National Key Project of Fundamental Research:The Land-Air Physical Processes over the Tibetan Plateau(TIPEX).
文摘A zonal domain primitive equation modeling system(ZDMS)is used to study the effects of the initial heating anomalies over the Tibetan Plateau and the western Pacific on the East Asian and the Chinese summer climate,the relative importance and the mechanisms are discussed.Results show that in spite of the different locations of the heating anomalies the influences of the two anomaly areas are much similar to each other when the scaling of the two areas is the same.The two areas of heating anomalies have their own affecting domains in which one is more important than the oth- er.In the western Pacific the heating anomaly over the western Pacific is more evident and in the Tibetan Plateau area the heating anomaly over the Tibetan Plateau is more obvious.For the east part of China the effects of the two heating anomalies both exist and almost have the equal impor- tance.The initial anomaly of the sea surface temperature(SST)over the western Pacific can be kept during the entire time integration while in the Tibetan Plateau it can not be maintained.
