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,...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.展开更多
基金The Key International Cooperation Project of Ministry of Science and Technology of China No.2001CB711003+3 种基金 National Natural Science Foundation of China No.40305007 The Science and Technology Innovation Project of Northwest Normal University No.NWNU-KJ
文摘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.