Holocene variations in productivity associated with changes in glacier activity and freshwater flux in the central basin of the Strait of Magellan
Holocene variations in productivity associated with changes in glacier activity and freshwater flux in the central basin of the Strait of Magellan
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DOI：
10.1016/j.palaeo.2015.06.023
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发表时间：
2015-10-15
影响因子：
3
通讯作者：
Kissel, Catherine
中科院分区：
文献类型：
--
作者：
Aracena, Claudia;Kilian, Rolf;Kissel, Catherine
控制巴塔哥尼亚最南端峡湾初级生产力的最重要因素之一是水柱温盐结构的变化。在当今环境中，热分层主要与淡水输入有关，特别是与冰川的季节性融化有关。在这里，我们评估峡湾生产力和淡水输入之间的关系是否适用于全新世，使用麦哲伦海峡中央盆地的沉积物记录（核心MD 07 -3132，53度44.17'S; 70度19.03 'W，301米）。我们的方法依赖于代理为基础的重建峡湾海表温度（kenone SST），古盐度，淡水输入，和paleoproductivity。结果表明，全新世早期，海洋有机碳的积累速率较低（
One of the most important factors controlling fjord primary production in southernmost Patagonia is the variability in the thermohaline structure of the water column. In the present-day environment, thermal stratification is mostly related to freshwater input and in particular, the seasonal melting of glaciers. Here we assess whether this relation between fjord productivity and freshwater input holds true for the Holocene, using a sediment record from the central basin of the Strait of Magellan (core MD07-3132, 53 degrees 44.17'S; 70 degrees 19.03'W, 301 m). Our approach relies on a proxy-based reconstruction of fjord sea surface temperature (alkenone SST), paleosalinity, freshwater input, and paleoproductivity. The results indicate that, during the early Holocene, the accumulation rate (AR) of marine organic carbon was low (