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更重要的是在南极冰架崩解或基底融化?

存在75%的南极洲沿岸冰架,覆盖150万平方公里。两个主要过程引起的质量损失冰架是基底融化和崩解。这两个过程是在南极洲更重要?

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有两个研究发表于2013年,提供最新更新这种平衡>所做,硕士6人,2013年。产犊通量和基底融化南极冰架。自然,502,89 - 92,(2013年10月3日),doi: 10.1038 / nature12567 > >里格诺特,e, 3人,2013年。南极洲冰架融化周围。科学,341,6143,266 - 270,(2013年7月19日),doi: 10.1126 /科学。1235798 The first study arrives at a calving loss of 1321 ± 144 Gt/yr year and a total basal mass balance of −1454 ± 174 Gt/yr (− = loss). The mass balance is the net of mass added by freeze on and mass lost by melting so the number does not reflect melting alone. The pure loss by melt is hence larger but from a balance perspective the net is what counts. The second study indicates a calving flux of 1089 ± 139 Gt/yr and a basal melt of 1325 ± 235 Gt/yr. Although they report "melting" it is likely that they mean net balance as in the other study. The two studies have used slightly different approaches to arrive at their results, both indirect, but over all the numbers indicate that basal losses are larger than calving and that the order of magnitude is the same. In more detail, the studies show that calving losses are dominant from the larger ice shelves, the Ross and Filchner-Ronne. Melting dominate regions along the western Antarctic Peninsula and down along the coast of the Bellingshausen and Amundsen seas. For most of the East and West Indian Ocean coastlines losses are relatively small and equal between the two processes. The bottom line is that these studies have changed the perspective from ice loss being predominantly through calving to now slightly dominated by basal melting.

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\ begingroup美元它还取决于这架子上。一些融化损失90%,其他90%的裂冰的损失。似乎目前平均~ 50/50。 \ endgroup美元
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2015年6月11日,在20:48

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