文献类型：期刊文献

英文题名：Centennial-scale variability of sea-ice cover in the Chukchi Sea since AD 1850 based on biomarker reconstruction

作者：Bai, Youcheng[1,2,3];Sicre, Marie-Alexandrine[4];Ren, Jian[1,2];Jalali, Bassem[1,2];Klein, Vincent[4];Li, Hongliang[1,2];Lin, Long[5];Ji, Zhongqiang[1,2];Su, Liang[1,6];Zhu, Qingmei[7];Jin, Haiyan[1,2,8];Chen, Jianfang[1,2,8]

机构：[1]Minist Nat Resources, Key Lab Marine Ecosyst Dynam, Hangzhou 310012, Peoples R China;[2]Minist Nat Resources, Inst Oceanography 2, Hangzhou 310012, Peoples R China;[3]Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Peoples R China;[4]Sorbonne Univ, LOCEAN, CNRS, Pierre & Marie Curie, Case 100,4 Pl Jussieu, F-75005 Paris, France;[5]Polar Res Inst China, Key Lab Polar Sci, MNR, Shanghai 200136, Peoples R China;[6]Zhejiang Univ, Ocean Coll, Zhoushan 316021, Peoples R China;[7]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China;[8]Minist Nat Resources, State Key Lab Satellite Ocean Environm Dynam, Inst Oceanog 2, Hangzhou 310012, Peoples R China

年份：2022

卷号：17

期号：4

外文期刊名：ENVIRONMENTAL RESEARCH LETTERS

收录：SCI-EXPANDED(收录号：WOS:000777833300001)、、EI(收录号：20221712032562)、Scopus(收录号：2-s2.0-85128724704)、WOS

基金：We are grateful to the captain, crew members and scientific party of the R/V Xuelong for their help with the retrieve of the sediment core. We are grateful to Fanny Kaczmar who helped produce HBI data at the LOCEAN, Sorbonne Universite, Campus Pierre et Marie Curie (Paris), and to Dr Guillaume Masse for supplying the chemical standards. This study was funded by the Scientific Research Funds of the Second Institute of Oceanography, State Oceanic Administration, China (No. JG1911), the National Natural Science Foundation of China (Nos. 41976229, 41306200, 41606052, 41941013), the National Key Research and Development Program of China (Nos. 2019YFC1509101, 2019YEE0120900), the Chinese Polar Environmental Comprehensive Investigation and Assessment Programs (No. CHINARE 0304), and the project ICAR (Sea Ice melt, Carbon, Acidification and Phytoplankton in the present and past Arctic Ocean) funded by Cai Yuan Pei Program. We also thank the Centre National de la Recherche Scientifique (CNRS) for M -A S salary. We are grateful to the two anonymous reviewers who provided constructive suggestions for the manuscript improvement.

语种：英文

外文关键词：sea ice; biomarkers; IP25; HBI III; PIP25 index; Chukchi sea

外文摘要：Paleo-climate proxy records documenting sea-ice extent are important sources of information to assess the time of emergence and magnitude of on-going changes in the Arctic Ocean and better predict future climate and environmental evolution in that region. In this study, a suite of geochemical tracers including total organic carbon (TOC), total nitrogen (TN), carbon/nitrogen ratio (C/N), stable isotope composition of organic carbon and nitrogen (delta C-13, delta N-15), and phytoplankton biomarkers (highly branched isoprenoids (HBIs) and sterols) were measured in a marine sediment core to document the sea-ice variability in the Chukchi Sea since the beginning of the Industrial Era. The downcore profile of the sea-ice proxy HBIs suggests a transition from extensive sea ice in the late 19th century to Marginal Ice Zone (MIZ) in AD 1930-1990s and then moderate sea-ice cover since 1990s. Rising of all HBI abundances between AD 1865-1875 indicate a transient retreat of summer ice edge off the shelf followed by a return to near-perennial sea ice till 1920-1930 as revealed by the absence of HBIs and brassicasterol. Sea ice retreat occurred again in AD 1920-1930 and followed by colder decades in 1940s-1960s before a sustained decline since the 1990s. The downcore profile of C/N, delta C-13 of organic matter and sterols indicates a gradual increase of terrigenous inputs accelerating during the most recent decades likely due to enhanced fluvial run-off and sediment transport by sediment-laden sea ice. Concomitantly, increasing delta N-15 values suggest limited nutrient utilization due to enhanced stratification of the surface ocean caused by increased freshening. The role of the Arctic oscillation (AO), the Pacific decadal oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO) are discussed to explore potential drivers of the observed sea-ice changes.