On the basis, of the surface heat fluxes of the Kuroshio key-area (26°-30°N, 125°-30°E)in March andApril, the climatologicai influence of the Kuroshio heat fluxes on meiyu rainfall in the Changjian...On the basis, of the surface heat fluxes of the Kuroshio key-area (26°-30°N, 125°-30°E)in March andApril, the climatologicai influence of the Kuroshio heat fluxes on meiyu rainfall in the Changjiang River (Yangtse River) region are studied. The results are concluded as follows;the surface heat fluxes of the Kuroshio key-area have certain influence on meiyu rainfall in the Changjiang River region during June and July. The correctness rates for the five stations in the Changjing River region (i. e. Wuhan, Jiujiang, Anqing,Nanjing and Shanghai)are in the range of 9/20-13/20. The surface heat fluxes influence mainly on the homogeneous rainfall pattern,the correctness rates come to 7/10-8/10 for the lower valley of the Changjiang River. The estimation expression of the meiyu rainfall for Shanghai consisting of the surface heat flux and the sea surface temperature anomaly of the Kuroshio key area agrees well with the actual meiyu rainfall condition.展开更多
The surface and atmospheric heating fields over the Qinghai-Xizang Plateau are computed by using the observational data of solar radiation during 1982—1983.The mian results are as follows:The central and northern par...The surface and atmospheric heating fields over the Qinghai-Xizang Plateau are computed by using the observational data of solar radiation during 1982—1983.The mian results are as follows:The central and northern parts of the Plateau act as heat sinks in winter from November to January.Both eastern and south- ern parts of the Plateau are of heat sources.In summer,the main part of the Plateau acts as a strong heat source,and the center of the heating field is in the southeastern Plateau.However the main part of the Plateau acts as a heat sink for the atmospheric heating fields from October to March.The maximum intensity of the atmospheric heat sink over the central Plateau appears in December and January.From April to September,the main part of the Plateau acts as a heat source for the atmospheric heating fields.展开更多
The impacts of the variations of surface heat fluxes over the Tibetan Plateau (TP) and surrounding areas on the interannual variation of the South China Sea (SCS) summer monsoon intensity is analyzed using the NCEP/NC...The impacts of the variations of surface heat fluxes over the Tibetan Plateau (TP) and surrounding areas on the interannual variation of the South China Sea (SCS) summer monsoon intensity is analyzed using the NCEP/NCAR reanalysis monthly sensible heat flux data from 1949 to 2000 and monthly mean wind and temperature field data from 1958 to 1997.The results show that there is a distinct interdecadal trend in sensible heat over the key areas of the TP and the SCS summer monsoon intensity as well as South Asia high intensity (SAHI),the transition occurs in late 1970s.The SCS summer monsoon intensity has a significant positive correlation with the variation of surface sensible heat fluxes over the northwestern part of the TP,while it has negative correlation with the surface sensible heat fluxes in the south of the TP.During the strong SCS summer monsoon year,the vertical ascending motion in the northwestern TP is strengthened,but in the southern TP it is weakened,and the position of the South Asian high is northward,while in the weak summer monsoon year,it is in the contrary.The SAHI is closely related to variation of surface heat fluxes over the TP and surrounding areas,and there exists a negative relationship between the SCS summer monsoon intensity and SAHI.展开更多
This study deals with the turbulent structure in the surface layer over the Qinghai-Xizang Plateau.Using gradient transfer and heat balance methods we have determined the nondimensional coefficient 1/(?)_m(?)h in the ...This study deals with the turbulent structure in the surface layer over the Qinghai-Xizang Plateau.Using gradient transfer and heat balance methods we have determined the nondimensional coefficient 1/(?)_m(?)h in the expression of turbulent transfer coefficient for sensible heat (K_h).It is found that the results are in good agreement with the 1/(?)_m(?)_h obtained by Pruitt,et al.The K_h at a height of 1m under cloudy and cloudless conditions is calculated.Finally,the ratio of K_h to momentum turbulent coefficient over the plateau is compared with those over plains.展开更多
文摘On the basis, of the surface heat fluxes of the Kuroshio key-area (26°-30°N, 125°-30°E)in March andApril, the climatologicai influence of the Kuroshio heat fluxes on meiyu rainfall in the Changjiang River (Yangtse River) region are studied. The results are concluded as follows;the surface heat fluxes of the Kuroshio key-area have certain influence on meiyu rainfall in the Changjiang River region during June and July. The correctness rates for the five stations in the Changjing River region (i. e. Wuhan, Jiujiang, Anqing,Nanjing and Shanghai)are in the range of 9/20-13/20. The surface heat fluxes influence mainly on the homogeneous rainfall pattern,the correctness rates come to 7/10-8/10 for the lower valley of the Changjiang River. The estimation expression of the meiyu rainfall for Shanghai consisting of the surface heat flux and the sea surface temperature anomaly of the Kuroshio key area agrees well with the actual meiyu rainfall condition.
文摘The surface and atmospheric heating fields over the Qinghai-Xizang Plateau are computed by using the observational data of solar radiation during 1982—1983.The mian results are as follows:The central and northern parts of the Plateau act as heat sinks in winter from November to January.Both eastern and south- ern parts of the Plateau are of heat sources.In summer,the main part of the Plateau acts as a strong heat source,and the center of the heating field is in the southeastern Plateau.However the main part of the Plateau acts as a heat sink for the atmospheric heating fields from October to March.The maximum intensity of the atmospheric heat sink over the central Plateau appears in December and January.From April to September,the main part of the Plateau acts as a heat source for the atmospheric heating fields.
基金South China Sea Monsoon Experiment (SCSMEX)the Project from National Natural Science Foundation of China"The interaction between the South Asian high and Asian summer monsoon and its mechanism study"(40175021)
文摘The impacts of the variations of surface heat fluxes over the Tibetan Plateau (TP) and surrounding areas on the interannual variation of the South China Sea (SCS) summer monsoon intensity is analyzed using the NCEP/NCAR reanalysis monthly sensible heat flux data from 1949 to 2000 and monthly mean wind and temperature field data from 1958 to 1997.The results show that there is a distinct interdecadal trend in sensible heat over the key areas of the TP and the SCS summer monsoon intensity as well as South Asia high intensity (SAHI),the transition occurs in late 1970s.The SCS summer monsoon intensity has a significant positive correlation with the variation of surface sensible heat fluxes over the northwestern part of the TP,while it has negative correlation with the surface sensible heat fluxes in the south of the TP.During the strong SCS summer monsoon year,the vertical ascending motion in the northwestern TP is strengthened,but in the southern TP it is weakened,and the position of the South Asian high is northward,while in the weak summer monsoon year,it is in the contrary.The SAHI is closely related to variation of surface heat fluxes over the TP and surrounding areas,and there exists a negative relationship between the SCS summer monsoon intensity and SAHI.
文摘This study deals with the turbulent structure in the surface layer over the Qinghai-Xizang Plateau.Using gradient transfer and heat balance methods we have determined the nondimensional coefficient 1/(?)_m(?)h in the expression of turbulent transfer coefficient for sensible heat (K_h).It is found that the results are in good agreement with the 1/(?)_m(?)_h obtained by Pruitt,et al.The K_h at a height of 1m under cloudy and cloudless conditions is calculated.Finally,the ratio of K_h to momentum turbulent coefficient over the plateau is compared with those over plains.
