Carbon cycling and burial in the glacially influenced polar North Atlantic
Carbon cycling and burial in the glacially influenced polar North Atlantic
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受冰川影响的北大西洋极地的碳循环和埋藏
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
G. Munhoven
中科院分区：
文献类型：
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作者：
J. Taylor;M. Tranter;G. Munhoven
[1]我们整理了北大西洋极地沉积物中碳储存（碳酸钙和有机碳的wt %）的已发表记录，以评估格陵兰岛和芬诺斯坎迪亚冰川历史可能对这一海洋学重要地区的碳循环所起的作用。沉积物中碳酸盐的比例在0 ~ 50%之间，有机碳的比例在0 ~ 2.0%之间。两种成分的浓度和积累量在空间上存在显著差异。大块堆积与深度、离岸距离和邻近大陆上主要冰川出口的位置密切相关。因此，冰盖动力学和侵蚀作用通过对沉积速率和组分的影响，强烈地影响了魏希塞世晚期（27-12 14C ka）的碳（特别是有机碳）储存。相反，水团特征在确定全新世的碳储存模式方面很重要。在冰期，北大西洋极区沉积物柱的碳酸盐通量下降了~ 50%，降至~ 1.1 × 1013 kg kyr−1，但有机碳储量保持在间冰期水平或高于间冰期水平（~ 4.6 × 1011 kg kyr−1）。这表明保存的无机碳与有机碳的比例发生了100%的变化。当与深水通风减少相结合时，水和沉积物柱中相对较大的有机碳通量的呼吸作用很好地解释了北大西洋极地晚期魏克塞利剖面中观察到的周期性碳酸盐溶解增强，可能增强了深水中的二氧化碳储存。
[1] We have collated published records of carbon storage (wt % calcium carbonate and organic carbon) in polar North Atlantic sediments in order to assess the role that the glacial history of Greenland and Fennoscandia may have had on carbon cycling in this oceanographically important region. The proportion of carbonate in sediment varies between 0 and ∼50%, while that of organic carbon varies between 0 and ∼2.0%. The spatial variation of the concentration and accumulation of both constituents is markedly different. Bulk accumulation shows a strong relationship with depth, distance offshore, and the location of major glacial outlets on neighboring landmasses. Therefore, ice sheet dynamics and erosion influence carbon (especially organic carbon) storage strongly during the late Weichselian (27-12 14C ka) via their impact on sedimentation rates and constituents. In contrast, water mass characteristics are important in determining the pattern of carbon storage during the Holocene. Carbonate fluxes to the polar North Atlantic sediment column fall by ∼50% during glacials to ∼1.1 × 1013 kg kyr−1, but organic carbon storage is maintained at or greater than interglacial levels (∼4.6 × 1011 kg kyr−1). This represents a 100% change in the ratio of preserved inorganic to organic carbon. When combined with reduced deep water ventilation, respiration of this relatively greater organic carbon flux in both the water and sediment columns provides a good explanation for the observed periodic enhanced dissolution of carbonate in polar North Atlantic late Weichselian sections, perhaps enhancing CO2 storage in deep waters.