Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25.
Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25.
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DOI：
10.1038/ncomms12655
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发表时间：
2016-08-30
影响因子：
16.6
通讯作者：
Taylor, K. W. R.
中科院分区：
文献类型：
--
作者：
Belt, S. T.;Smik, L.;Brown, A.;Kim, J. -H.;Rowland, S. J.;Allen, C. S.;Gal, J. -K.;Shin, K. -H.;Lee, J. I.;Taylor, K. W. R.
在南大洋沉积物中存在的二不饱和高度支化的类异戊二烯（HBI）脂质生物标志物（二烯II）以前曾被提议作为古南极海冰的替代措施。在这里，我们表明二烯II的来源是症状性硅藻Berkeleya adeliensis Medlin。此外，对B.在南极海岸和近海岸环境中，>100个表层沉积物中二烯II浓度的离岸向下梯度反映了adeliensis在片状冰中的繁荣。由于血小板冰的形成与过冷的淡水流入密切相关，我们进一步假设，沉积二烯II提供了一个潜在的敏感的代理指标的影响，从附近的冰川和冰架融水排放的固定海冰，和重新检查一些以前的二烯II downcore记录支持这一假设。IPSO 25（英语：Ice Proxy for the Southern Ocean with 25 carbon atoms）一词被提议作为二烯II的替代名称。 硅藻类脂二烯II（以下简称IPSO 25）的沉积存在已被提出作为古南极海冰的代理。在这里，作者确定了IPSO 25的来源，并假设其沉积分布可能提供受淡水排放影响的陆地固定冰的代理证据。
The presence of a di-unsaturated highly branched isoprenoid (HBI) lipid biomarker (diene II) in Southern Ocean sediments has previously been proposed as a proxy measure of palaeo Antarctic sea ice. Here we show that a source of diene II is the sympagic diatom Berkeleya adeliensis Medlin. Furthermore, the propensity for B. adeliensis to flourish in platelet ice is reflected by an offshore downward gradient in diene II concentration in >100 surface sediments from Antarctic coastal and near-coastal environments. Since platelet ice formation is strongly associated with super-cooled freshwater inflow, we further hypothesize that sedimentary diene II provides a potentially sensitive proxy indicator of landfast sea ice influenced by meltwater discharge from nearby glaciers and ice shelves, and re-examination of some previous diene II downcore records supports this hypothesis. The term IPSO25—Ice Proxy for the Southern Ocean with 25 carbon atoms—is proposed as a proxy name for diene II. The sedimentary presence of the diatom lipid diene II (hereafter IPSO25) has been proposed as a proxy for palaeo Antarctic sea ice. Here, the authors identify a source of IPSO25 and hypothesize that its sedimentary distribution may provide proxy evidence of landfast ice influenced by freshwater discharge.
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