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Impact of water depth on the distribution of iGDGTs in the surface sediments from the northern South China Sea： applicability of TEXss in marginal seas

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Frontiers of Earth Science 2018年第1期12卷 95-107页

作者： Jiali CHEN Pengju HU Xing LI Yang YANG Jinming SONG Xuegang LI Huamao YUAN sing Li Xiaoxia LU State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Wuhan 430074 China Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China College of Marine Science and Technology China University of Geosciences Wuhan 430074 China Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China No.5 Middle School of Nan Chang Nanchang 330029 China

The TEXh86 paleothermometer on the base of isoprenoid glycerol dialkyl glycerol tetraethers （iGDGTs） has been widely applied to various marine settings to reconstruct past sea surface temperatures （SSTs）. However, it remains uncertain how well this proxy reconstructs SSTs in marginal seas. In this study, we analyze the environmental factors governing distribution ofiGDGTs in surface sediments to assess the applicability of TEXH86 paleothermometer in the South China Sea （SCS）. Individual iGDGT concentrations increase gradually eastwards. Redundancy analysis based on the relative abundance of an individual iGDGT compound and environmental parameters suggests that water depth is the most influential factor to the distribution of iGDGTs, because thaumarchaeota communities are water-depth dependent. Interestingly, the SST difference （AT） between TEXH86 derived temperature and remote-sensing SST is less than 1°C in sediments with water depth 〉 200 m, indicating that TEXH86 was the robust proxy to trace the paleo-SST in the region if water depth is greater than 200 m.

关键词： iGDGTs distribution South China Sea（SCS） sea surface temperature water depth

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Biomarker records of D5-6 columns in the eastern Antarctic Peninsula waters:responses of planktonic communities and bio-pump structures to sea ice global warming in the past centenary

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Advances in Polar Science 2021年第1期32卷 28-41页

作者： YANG Dan ZHANG Haisheng HAN Zhengbing HAN Xibin ZHANG Yicheng CHEN Wensheng LIU Qian PAN Jianming FAN Gaojing LE Fengfeng LU Bing HUANG Jing Key Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Zhuhai Central Station of Marine Environmental Monitoring State Oceanic AdministrationZhuhai 519015China Polar Research Institute of China Shanghai 200136China*

Molecular biomarkers(e.g.,isoprenoid glycerol dialkyl glycerol tetraethers(iGDGTs)and proxies,such as di-unsaturated to tri-unsaturated highly branched isoprenoids(D/T)ratio,total organic carbon,δ^(13)C and ice-rafted debris(IRD))were used to reconstruct the dominant phytoplankton(diatoms,dinoflagellates and coccolithophores),phytoplankton and zooplankton productivity,biological pump structure,and archaea assemblage(Euryarchaeota and Crenarchaeota)from a marine sediment core(D5-6)dated with^(210)Pb(1922–2012).We characterized the environmental response to sea ice variations/global warming off the eastern Antarctic Peninsula.The results showed that(1)the biomarkers brassicasterol(average=519.79 ng·g^(-1)),dinosterol(average=129.68 ng·g^(-1))and C37 alkenones(average=40.53 ng·g^(-1))reconstructed phytoplankton(average=690.00 ng·g^(-1))and zooplankton(cholesterol average=669.25 ng·g^(-1))productivity.The relative contribution to productivity by different phytoplankton groups was diatoms>dinoflagellates>coccolithophores.This is consistent with field surveys showing that diatoms dominate the phytoplankton in waters adjacent to the Antarctic Peninsula.(2)The relative abundances of different highly branched isoprenoids reflected the contributions of sea ice algae and open water phytoplankton(D/T=1.2–30.15).Phytoplankton productivity and sea ice showed a good linear relationship with a negative correlation,indicating that more open water during periods of warming and reduced sea ice cover led to an enhanced biological pump.(3)Over the past 100 years,phytoplankton productivity and zooplankton biomass increased.This trend was particularly evident in the last 50 years,corresponding to increased global warming,and showed a negative correlation with IRD and D/T.This suggests that with decreasing sea ice coverage in a warming climate,diatom biomass greatly increased.Coccolithophore/diatom values and the ratio of C37 alkenones to total phytoplankton productivity decreased,indicating the proportion of coccolithophores in the phy

关键词： global warming phytoplankton productivity zooplankton productivity archaea iGDGTs sea ice proxy D/T eastern Antarctic Peninsula

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