南极拉森北部冰架表面物质损失机制探讨

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Abstract In this study,multiple data sets were selected,including declassified aerial photographs,optical remote sensing images and satellite radar altimetry data.A long time-series of monitoring the extent and surface elevation of Larsen A and B Ice Shelf was compiled.On this basis,combined with the two meteorological data of NCEP/NCAR summer monthly mean temperature data and GPCP global precipitation data,then the mass balance mechanism of the north Larsen ice shelf was discussed.The results showed that Larsen A and B ice shelf had already diminished by 14000km² since 1968 in the context of global warming.To date,Larsen A ice shelf has disappeared completely and Larsen B ice shelf remains an area of 2000km² only.Along with continuous collapsing and retreating of the ice shelf,Larsen A and B ice shelf have progressively thinned in recently decades,while lowering rate of the Larsen A (-0.45m/a) during 1992~2001 was significantly higher than that of the Larsen B (-0.09m/a) during 1992~2010.Air temperature and precipitation are two key parameters to estimate surface mass balance,the average summer temperature in Larsen A ice shelf raised from 0.16℃ in 1968 to 0.84℃ in recent years,and the average summer temperature in Larsen B ice shelf raised from 0.04℃ in 1968 to 0.66℃ in recent years.Meanwhile,the precipitation over the past several decades has little impact on surface mass balance of the northern Larsen ice shelf,but on the contrary the summer warm precipitation further aggravates the negative surface mass loss over the northern Larsen ice shelf.The main mechanism for continuous the northern Larsen ice shelf collapsing and retreating is attributed to warmer air temperatures and increased melt water production/refreezing,and it leads to surface lowering by firn densification.In addition,the retreat and even disappearance of Larsen ice shelf possibly lead to a reduction of back-stress with upstream flowing ice progressively thinned.In sum,the surface mass balance of Larsen A and B ice shelf show a clear and strong negative trend in context of global warming.

Key words： Larsen ice shelf remote sensing global warming surface mass balance

Received: 17 August 2017

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	CHEN Jun
	KE Chang-qing
	WANG Yong-feng

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CHEN Jun,KE Chang-qing,WANG Yong-feng. Study on the surface mass loss mechanism of the northern Larsen ice shelf[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(3): 1117-1125.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I3/1117

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