In 1996,two shallow ice cores were drilled at 7100m ASL. on the Dasuopu Glacier in the Xixiabangma in the middle Himalayas.Analytical results i ndicated that Cl\+- and Na\++ concentrations showed seasonal variations,a...In 1996,two shallow ice cores were drilled at 7100m ASL. on the Dasuopu Glacier in the Xixiabangma in the middle Himalayas.Analytical results i ndicated that Cl\+- and Na\++ concentrations showed seasonal variations,and there was a very good relation between them,which reflects that the moisture at the drilling site mainly came from oceans.An interesting phenomenon was that the changes in the ratio of Cl\+- to Na\++ in these cores might be associated with Indian summer monsoon rainfall in recent years (Fig.1).展开更多
To better understand ultra-high-altitude climate characteristics and their changes, an automatic weather station was installed on August 4, 2005 on the Mt. Xixiabangma Dasuopu glacier (28°23.04′N, 85°43.72...To better understand ultra-high-altitude climate characteristics and their changes, an automatic weather station was installed on August 4, 2005 on the Mt. Xixiabangma Dasuopu glacier (28°23.04′N, 85°43.72′E, 6900 m a.s.l.) in the middle of the Himalayas. Mountain weather conditions were observed continuously and automatically. This paper is the first to publish meteorological data for a whole year for a high-elevation region, and analyze wind direction, wind speed, air temperature, air pressure and humidity. Analysis of the observation data reveals that this region was strongly influenced by the westerly jet from October 10, 2005 to April 21, 2006 and by the Indian monsoon from May to September. The seasonal transitions of the westerly jet were characterized by changes in meteorological elements. In winter, influenced by the westerly jet, the wind speed in the study region was very high and fluctuated violently, gale days were frequent, temperature and air pressure fluctuated dramatically, the diurnal range of temperature decreased and the diurnal range of air pressure increased, relative humidity and specific humidity declined sharply, and air was dry. In summer, influenced by the Indian monsoon, the relative humidity and specific humidity were high. In addition, we analyzed reanalysis data for the location of the automatic weather station. The results confirmed that this region was strongly affected by the westerly jet from October 10, 2005 to April 21, 2006 and the observations that the seasonal transitions of the westerly jet were characterized by changes in meteorological elements.展开更多
文摘In 1996,two shallow ice cores were drilled at 7100m ASL. on the Dasuopu Glacier in the Xixiabangma in the middle Himalayas.Analytical results i ndicated that Cl\+- and Na\++ concentrations showed seasonal variations,and there was a very good relation between them,which reflects that the moisture at the drilling site mainly came from oceans.An interesting phenomenon was that the changes in the ratio of Cl\+- to Na\++ in these cores might be associated with Indian summer monsoon rainfall in recent years (Fig.1).
基金supported by the National Natural Science Foundation of China (40830638)Projects of International Cooperation (40810019001)+1 种基金the Third Pole Environment Program (GJHZ0906)the CAS/SAFEA International Partnership Program for Creative Research Teams
文摘To better understand ultra-high-altitude climate characteristics and their changes, an automatic weather station was installed on August 4, 2005 on the Mt. Xixiabangma Dasuopu glacier (28°23.04′N, 85°43.72′E, 6900 m a.s.l.) in the middle of the Himalayas. Mountain weather conditions were observed continuously and automatically. This paper is the first to publish meteorological data for a whole year for a high-elevation region, and analyze wind direction, wind speed, air temperature, air pressure and humidity. Analysis of the observation data reveals that this region was strongly influenced by the westerly jet from October 10, 2005 to April 21, 2006 and by the Indian monsoon from May to September. The seasonal transitions of the westerly jet were characterized by changes in meteorological elements. In winter, influenced by the westerly jet, the wind speed in the study region was very high and fluctuated violently, gale days were frequent, temperature and air pressure fluctuated dramatically, the diurnal range of temperature decreased and the diurnal range of air pressure increased, relative humidity and specific humidity declined sharply, and air was dry. In summer, influenced by the Indian monsoon, the relative humidity and specific humidity were high. In addition, we analyzed reanalysis data for the location of the automatic weather station. The results confirmed that this region was strongly affected by the westerly jet from October 10, 2005 to April 21, 2006 and the observations that the seasonal transitions of the westerly jet were characterized by changes in meteorological elements.
