Potential role of giant marine diatoms in sequestration of atmospheric CO2 during the Last Glacial Maximum: δ13C evidence from laminated Ethmodiscus rex mats in tropical West Pacific
Potential role of giant marine diatoms in sequestration of atmospheric CO2 during the Last Glacial Maximum: δ13C evidence from laminated Ethmodiscus rex mats in tropical West Pacific
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末次盛冰期巨型海洋硅藻在大气二氧化碳封存中的潜在作用：来自热带西太平洋层状霸王龙垫的 δ13C 证据
DOI：
10.1016/j.gloplacha.2013.06.003
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发表时间：
2013-09
影响因子：
3.9
通讯作者：
Zhai Bin
中科院分区：
文献类型：
--
作者：
Xiong Zhifang;Li Tiegang;Crosta Xavier;Algeo Thomas;Chang Fengming;Zhai Bin
巨型海洋硅藻在分层条件下在叶绿素最大值深处开花或聚集，可产生大量有机碳，并从表层沃茨输出大量有机碳。然而，它们在调节大气pCO 2的冰川间冰期变化中的作用仍不清楚。本文报道了筛盘藻（Ethmodiscus rexdiatoms.）雷克斯）和块状沉积物（δ 13 Corg）组成（从最年轻到最古老）：（1）层状E.硅藻席（LDM），（2）硅藻质粘土（DC），和（3）远洋粘土（PC）。结果表明，δ 13 CE. Rex比δ 13 Corg更好地记录了LDM和DC沉积期间的古海洋过程，因为近单种E中的差异生命效应减少。再萃取物我们使用了粗核的同位素组成。折射率（δ 13 CE.雷克斯（> 154 μm））计算末次盛冰期菲律宾海东部沃茨水CO2分压（pCO 2-sw）。OurpCO 2-swrecords表明，东菲律宾海从一个强的CO2源在DC沉积过程中的LDM沉积过程中的弱CO2汇。菲律宾海东部的作用，作为一个CO2汇在末次盛冰期的提升初级生产力，并在较小程度上，加强水柱分层。这些观测结果突出了巨大的海洋硅藻在封存大气CO2的LGM期间的潜在作用，因此，支持生物硅通量的变化作为一个潜在的原因，较低的冰川大气CO2。我们的研究结果是一致的风成来源的二氧化硅，提出的“二氧化硅假说”和“硅诱导的碱度泵假说”，但不是由“草酸渗漏假说”。
Giant marine diatoms, blooming or aggregating within deep chlorophyll maxima under stratified conditions, can generate substantial production and a large export flux of organic carbon from surface waters. However, their role in regulating glacial-interglacial variation in atmosphericpCO2remains unclear. Here, we report the organic carbon isotopic compositions ofEthmodiscus rexdiatoms (δ13CE. rex) and bulk sediments (δ13Corg) from a sediment core in the eastern Philippine Sea dated to ~ 19.5–31.0 kyr B.P. and consisting of (from youngest to oldest) (1) laminatedE. rexdiatom mats (LDM), (2) diatomaceous clay (DC), and (3) pelagic clay (PC). Our results suggest that δ13CE. rexprovides a better record of palaeoceanographic processes during LDM and DC deposition than δ13Corgbecause of reduced differential vital effects in near-monospecificE. rexfractions. We used the isotopic composition of the coarseE. rexfraction (δ13CE. rex(> 154 μm)) to calculate the CO2partial pressure of eastern Philippine Sea surface waters (pCO2-sw) during the Last Glacial Maximum (LGM). OurpCO2-swrecords suggest that the eastern Philippine Sea switched from being a strong CO2source during DC deposition to a weak CO2sink during LDM deposition. The role of the eastern Philippine Sea as a CO2sink during the LGM was promoted by elevated primary production and, to a lesser extent, intensified water-column stratification. These observations highlight the potential role of giant marine diatoms in the sequestration of atmospheric CO2during the LGM and, hence, support changes in biogenic silica fluxes as a potential cause of lower glacial atmospheric CO2. Our findings are consistent with an eolian source of silica, as proposed by the ‘silica hypothesis’ and the ‘silicon-induced alkalinity pump hypothesis’ but not by the ‘silicic acid leakage hypothesis.’
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DOI：
10.2973/dsdp.proc.60.129.1982
发表时间：
1982-03
期刊：
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影响因子：
--
作者：
E. Martini
通讯作者：
E. Martini
影响因子：
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作者：
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DOI：
10.1016/j.palaeo.2012.02.015
发表时间：
2012-04
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
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作者：
S. Wan;Zhaojie Yu;P. Clift;Hanjie Sun;Anchun Li;Tiegang Li
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S. Wan;Zhaojie Yu;P. Clift;Hanjie Sun;Anchun Li;Tiegang Li
DOI：
10.1016/j.palaeo.2005.10.026
发表时间：
2006-06
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
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64.8
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通讯作者：
Stocker, Thomas F.