极地研究2024，Vol.36Issue(2)：113-127,15.DOI:10.13679/j.jdyj.20230008
东西伯利亚陆架炭屑分布特征及其控制因素
Charcoal distribution in surface sediments of the East Siberian Shelf and its controlling factors
摘要
Abstract
Charcoal is a direct indicator of fire events.In the context of global warming and frequent circumpolar Arctic wildfires,the generation,migration and burial of charcoal are key elements contributing to the under-standing of the environmental effects of Arctic climate change and the source-sink trajectory of terrestrial carbon.However,there are few studies on charcoal in the Arctic Ocean.The East Siberian Shelf(ESS)is the largest continental shelf in the world,receiving and sequestering large amounts of terrestrial carbon.It is also one of the Arctic regions where the melting of sea ice,coastal erosion,and wildfires are the most pro-nounced,making it a favorable area to study the charcoal record in the Arctic.On the basis of the surface sediment samples obtained from the first Sino-Russian joint Arctic research expedition in 2016,the distribu-tion,concentration,relative abundance,transport process,and the controlling factors of charcoal on the ESS of different sizes were studied.The results show that the total concentration of charcoal in the ESS surface sediments lies between 4.4×104 and 4.1×106 grains·g-1,with an average of 9.3×105 grains·g-1.Coarse char-coal particles were found near shore and fine particles were found offshore.As a result of long-distance transport by hydrodynamics and wind,charcoal particles in the study area are dominated by ultrafine grains(83%on average).River input,coastal erosion,atmospheric transport,sea ice and current processes may jointly influence the cross-shelf pathway of charcoal.关键词
北极快速变化/东西伯利亚陆架/炭屑/输运过程/陆源输入Key words
Arctic rapid change/East Siberian Shelf/charcoal/transport processes/terrestrial input引用本文复制引用
俞心婷,任健,边叶萍,李中乔,林龙,金海燕,陈建芳..东西伯利亚陆架炭屑分布特征及其控制因素[J].极地研究,2024,36(2):113-127,15.基金项目
国家重点研发计划(2019YFE0120900,2019YFC1509101)和国家自然科学基金(41941013,42076241,42076242)资助 （2019YFE0120900,2019YFC1509101）
