The Spatial Structure of the 128 ka Antarctic Sea Ice Minimum
The Spatial Structure of the 128 ka Antarctic Sea Ice Minimum
复制标题
128 ka南极海冰最小值的空间结构
DOI：
10.1002/2017gl074594
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发表时间：
2017
影响因子：
5.2
通讯作者：
Holloway M
中科院分区：
文献类型：
--
作者：
Holloway M
我们比较了多冰芯数据与δ18O模型输出的末次间冰期早期南极海冰最小值。南极洲δ18O的空间分布对海冰退缩的空间分布十分敏感。局部海冰退缩增加了冬季降水的比例，消耗了冰芯站点的δ 18 O。然而，由于大气蒸气的源地距离减少，后退也富集了δ 18 O。总的影响是δ18O随着海冰的减少而增加。我们的数据模型比较表明，冬季海冰退缩67%，59%和43%，相对于南大洋的大西洋，印度洋和太平洋地区的工业化前。南大洋海冰代用数据的汇编为这一重建提供了微弱的支持。然而，大多数已公布的海洋核心站点位于128，000年B.P.海冰边缘以北太远的地方，阻止了对海冰重建的独立证实。
We compare multi‐ice core data withδ18O model output for the early last interglacial Antarctic sea ice minimum. The spatial pattern ofδ18O across Antarctica is sensitive to the spatial pattern of sea ice retreat. Local sea ice retreat increases the proportion of winter precipitation, depletingδ18O at ice core sites. However, retreat also enrichesδ18O because of the reduced source‐to‐site distance for atmospheric vapor. The joint overall effect is forδ18O to increase as sea ice is reduced. Our data‐model comparison indicates a winter sea ice retreat of 67, 59, and 43% relative to preindustrial in the Atlantic, Indian, and Pacific sectors of the Southern Ocean. A compilation of Southern Ocean sea ice proxy data provides weak support for this reconstruction. However, most published marine core sites are located too far north of the 128,000 years B.P. sea ice edge, preventing independent corroboration for this sea ice reconstruction.