Carbon isotope ratios of n-alkanoic acids: new organic proxies for paleo-productivity in Antarctic ponds

作     者：CHEN Xin JIN Jing NIE Yaguang ZHANG Jifeng DONG Liang HUANG Xianyu Steven DEMSLIE LIU Xiaodong CHEN Xin;JIN Jing;NIE Yaguang;ZHANG Jifeng;DONG Liang;HUANG Xianyu;Steven D.EMSLIE;LIU Xiaodong

作者机构：Anhui Province Key Laboratory of Polar Environment and Global ChangeSchool of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China School of OceanographyShanghai Jiao Tong UniversityShanghai 200030China Key Laboratory for Polar Ecosystem and Climate Change of Ministry of EducationSchool of OceanographyShanghai Jiao Tong UniversityShanghai 200030China Information Materials and Intelligent Sensing Laboratory of Anhui ProvinceInstitutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Research Center for EcologyCollege of ScienceTibet UniversityLhasa 850000China Key Laboratory of Polar ScienceMNRPolar Research Institute of ChinaShanghai 200136China Hubei Key Laboratory of Critical Zone EvolutionSchool of Geography and Information EngineeringChina University of GeosciencesWuhan 430078China Department of Biology and Marine BiologyUniversity of North CarolinaWilmingtonNC 28403USA 

出 版 物：《Advances in Polar Science》 (极地科学进展（英文版）)

年 卷 期：2023年第34卷第4期

页      面：304-317页

核心收录：

学科分类：070902[理学-地球化学] 070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 0705[理学-地理学] 070501[理学-自然地理学] 

基　　金：supported by the National Natural Science Foundation of China (Grant nos. 42276240, 42206243, 41776188) the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant no. XDB40000000) the Shanghai Sailing Program (Grant no. 22YF1418800) the China Postdoctoral Science Foundation (Grant no. 2022M712038) the Shanghai Frontiers Science Center of Polar Science (SCOPS) the Chinese Arctic and Antarctic Administration (CAA) for supporting the project 

主　　题：East Antarctica lipid biomarkers carbon isotopic ratios pond primary productivity climate change 

摘      要：Primary productivity in the Antarctic aquatic environment with simple ecosystems is sensitive to climate and environmental *** investigatedδ13C values for n-alkanoic acids derived from phototrophic organisms in a lacustrine sediment core(IIL3)to indicate primary productivity in ponds on Inexpressible Island in the western Ross Sea,***-chain n-alkanoic acids(C14–C18)were abundant in the IIL3 sediment *** carbon isotope ratios of short-chain n-alkanoic acids in the sediment samples and floating microbial mats were similar,indicating that the short-chain n-alkanoic acids in the IIL3 sediment profile predominantly originated from phototrophic ***δ13C values for the short-chain n-alkanoic acids varied widely through the sediment profile,and 13C-enrichment of n-alkanoic acids was most likely related to high productivity due to carbon-limited conditions caused by enhanced photosynthetic ***δ13C values for the n-alkanoic acids changed over the past 3200 years in similar ways to organic proxies for aquatic productivity(n-alkanoic acid and sterol sedimentary fluxes).C16 n-alkanoic acid was enriched in 13C in periods of high aquatic productivity~750–1650 and 3000–3200 a BP but depleted in 13C in periods of relatively low productivity~150–600 and 2500–3000 a *** results indicated that carbon isotope ratios of lipids from phototrophic organisms could be used as new proxies to reconstruct paleo-productivity in Antarctic lakes and ponds and therefore improve our understanding of past climate changes.