Expeditions during the summers of 2002 and 2003 implemented continuous monitoring of near-surface(2 m height)atmospheric CO_(2)and H2O concentrations at the 4500 m elevation on Muztagata.The resultant data sets reveal...Expeditions during the summers of 2002 and 2003 implemented continuous monitoring of near-surface(2 m height)atmospheric CO_(2)and H2O concentrations at the 4500 m elevation on Muztagata.The resultant data sets reveal a slight decrease of CO_(2)concentrations(of about 5μmol·mol?1)and changes in the diurnal variations from the end of June to the middle August.The daily maximum CO_(2)concentrations occur between 02:30―05:30 AM(local time)and the minimum levels occur between 12:00―15:30 PM.The atmospheric CO_(2)concentrations in the summer of 2002 were around 5μmol·mol?1 lower than those during the same period of 2003,whereas the diurnal amplitude was higher.In contrast,we found that the daily mean atmospheric H2O content in 2003 was much lower than that in 2002 and there exists a striking negative correlation between CO_(2)and H2O con-centrations.We therefore suggest that the near-surface atmospheric CO_(2)concentration is affected not only by photosynthesis and respiration,but also by the air H2O content in the glaciated region around Muztagata.展开更多
基金supported by the Chinese Academy of Sciences(Grant No.KZCX1-SW-01-10 and KZCX3-SW-339)the National Basic Research Program of China(Grant No.2005CB422004)the National Natural Science Foundation of China(Grant Nos.40471022 and 40121101).
文摘Expeditions during the summers of 2002 and 2003 implemented continuous monitoring of near-surface(2 m height)atmospheric CO_(2)and H2O concentrations at the 4500 m elevation on Muztagata.The resultant data sets reveal a slight decrease of CO_(2)concentrations(of about 5μmol·mol?1)and changes in the diurnal variations from the end of June to the middle August.The daily maximum CO_(2)concentrations occur between 02:30―05:30 AM(local time)and the minimum levels occur between 12:00―15:30 PM.The atmospheric CO_(2)concentrations in the summer of 2002 were around 5μmol·mol?1 lower than those during the same period of 2003,whereas the diurnal amplitude was higher.In contrast,we found that the daily mean atmospheric H2O content in 2003 was much lower than that in 2002 and there exists a striking negative correlation between CO_(2)and H2O con-centrations.We therefore suggest that the near-surface atmospheric CO_(2)concentration is affected not only by photosynthesis and respiration,but also by the air H2O content in the glaciated region around Muztagata.
