Seasonal Air Temper ature Variations Retr ieved from a Geladaindong Ice Core, Tibetan Plateau
Received date: 2006-09-12
Revised date: 2007-04-05
Online published: 2007-05-25
Supported by
National Natural Science Foundation of China, No.40401054; National 973 Program of China, No.2005CB422004; CAS Hundred Talents Program; Knowledge Innovation Program of CAS, No.KZCX3-SW-339/334
A 70-year history of precipitation δ18O record has been retrieved using an ice core drilled from a plat portion of the firn area in the Guoqu Glacier (33o34'37.8"N, 91o10'35.3"E, 5720 m a.s.l.) on Mt. Geladaindong (the source region of the Yangtze River) during October and November, 2005. Based on the seasonality of δ18O records and the significant positive relationships between monsoon/non-monsoon δ18O values and summer/spring air temperature from the nearby meteorological stations, the history of summer and spring air temperature have been reconstructed for the last 70 years. The results show that both summer and spring air temperature variations present similar trends during the last 70 years. Regression analysis indicates that the slope of the temperature - δ18O relationship is 1.3 oC/‰ for non-monsoon δ18O values and spring air temperature, and 0.4 oC/‰ for monsoon δ18O values and summer air temperature. Variation of air temperature recorded in the ice core is consistent with that in the Northern Hemisphere (NH), however, the warming trend in the Geladaindong region is more intense than that in the NH, reflecting a higher sensitivity to global warming in the high elevation regions. In addition, warming trend is greater in spring than in summer.
Key words： ice core +18O; summer; spring; air temperature variations; Mt. Geladaindong; Tibetan Plateau
ZHANG Yongjun, KANG Shichang, QIN Dahe, REN Jiawen,ZHANG Yulan, Bjorn GRIGHOLM, Paul MAYEWSKI . Seasonal Air Temper ature Variations Retr ieved from a Geladaindong Ice Core, Tibetan Plateau[J]. Acta Geographica Sinica, 2007 , 62(5) : 501 -509 . DOI: 10.11821/xb200705006
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