Lambert冰川流域东西两侧气候环境变化特征(英文)

The climatic and environmental features on both sides of the Lambert Glacier Basin

During the 1992-1993 joint Australian-Chinese over-snow traverse of the western Lambert Glacier Basin (LGB), two firn cores were drilled respectively at MGA and LGB16. During the 1996-1997 and 1997-1998 austral summers, two firn cores were drilled respectively at DT001 and DT085 on the eastern LGB. Based on the measurements made during the expeditions, the climatic and environmental features on both sides of the LGB have been studied. Results show that during the past 50 years, the trends of both air temperature and accumulation rate show a slight increase on the east side of the LGB, in contrast to the west side of the LGB. The spatial trends of the accumulation rate measured by accumulation canes at 2 km intervals along the nearly 500 km of the traverse lines on both sides of the LGB are different. Moreover, correlations of ?啄18O vs T10 along the two sides of the LGB are also different. In addition, the variations of sea salt ion concentrations show different trends in the past 50 years. All the evidence shows that the Lambert Glacier is a dividing region for the different climatic regimes over the East Antarctic ice sheet, which may be due to different moisture resources resulting from special local circumfluence such as cyclone activities, local terrain influences.

During the 1992-1993 joint Australian-Chinese over-snow traverse of thewestern Lambert Glacier Basin (LGB), two firn cores were drilled respectively at MGA and LGB16.During the 1996-1997 and 1997-1998 austral summers, two firn cores were drilled respectively atDT001 and DT085 on the eastern LGB. Based on the measurements made during the expeditions, theclimatic and environmental features on both sides of the LGB have been studied. Results show thatduring the past 50 years, the trends of both air temperature and accumulation rate show a slightincrease on the east side of the LGB, in contrast to the west side of the LGB. The spatial trends ofthe accumulation rate measured by accumulation canes at 2 km intervals along the nearly 500 km ofthe traverse lines on both sides of the LGB are different. Moreover, correlations of δ^(18)O vsT_(10) along the two sides of the LGB are also different. In addition, the variations of sea saltion concentrations show different trends in the past 50 years. All the evidence shows that theLambert Glacier is a dividing region for the different climatic regimes over the East Antarctic icesheet, which may be due to different moisture resources resulting from special local circumfluencesuch as cyclone activities, local terrain influences.