A novel chemical fossil of palaeo sea ice:: IP25
A novel chemical fossil of palaeo sea ice:: IP25
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DOI：
10.1016/j.orggeochem.2006.09.013
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发表时间：
2007-01-01
影响因子：
3
通讯作者：
LeBlanc, Bernard
中科院分区：
文献类型：
--
作者：
Belt, Simon T.;Masse, Guillaume;LeBlanc, Bernard
在加拿大北极地区相距数千公里的三个地点的海冰样本中检测到了一种独特且新颖的有机化合物。这种生物标记物很可能是由生活在海冰中的硅藻产生的，我们提供的证据表明，这种化合物（一种 C-25 单不饱和烃 (IP25)）可能是至少全新世沉积物中海冰的特异性、敏感且稳定的代表物。由于以前没有报道过，我们通过合成确认了其身份，并使用合成的化合物作为量化加拿大北极东西横断面一系列沉积物中 IP25 的参考。最近的沉积物要么季节性地被冰覆盖，要么有永久的冰覆盖。使用放射性碳方法测定含有 IP25 的较古老沉积物的年代至少为 9000 年。如果这个概念被证明普遍适用，监测更多沉积物岩心中的 IP25 以及其他公认的替代指标，应该可以更好地确定整个全新世（至少）冰缘位置的运动，这对于准确校准气候预测模型至关重要。对南极冰和沉积物样本采取类似的方法似乎也值得。 (c) 2006 Elsevier Ltd. 保留所有权利。
A unique and novel organic compound has been detected in sea ice samples from three locations in the Canadian Arctic, thousands of kilometers apart. It is likely that this biomarker is produced by diatoms living in the sea ice and we provide evidence which suggests that the compound, a C-25 monounsaturated hydrocarbon (IP25), may be a specific, sensitive and stable proxy for sea ice in sediments over at least the Holocene. Since it has not been reported before, we confirmed its identity by synthesis and used the synthesized compound as a reference for quantifying IP25 in a range of sediments from an East-West transect in the Canadian Arctic. The recent sediments are either seasonally covered with ice or have permanent ice cover. Older sediments containing IP25 have been dated using radiocarbon methods to at least 9000 yr. If the concept proves generally applicable, monitoring IP25 in further sediment cores along with other accepted proxies, should allow movements in the position of the ice edge throughout the Holocene (at least) to be better determined, which is essential for accurate calibration of climate prediction models. A similar approach for Antarctic samples of ice and sediments would also seem worthwhile. (c) 2006 Elsevier Ltd. All rights reserved.