气候变化领域集成服务门户(CCPortal): The roles of river discharge and sea ice melting in formation of freshened surface layers in the Kara, Laptev, and East Siberian seas

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DOI	10.3389/fmars.2024.1348450
	The roles of river discharge and sea ice melting in formation of freshened surface layers in the Kara, Laptev, and East Siberian seas
	Osadchiev, Alexander; Kuskova, Ekaterina; Ivanov, Vladimir
发表日期	2024
EISSN	2296-7745
起始页码	11
卷号	11
英文摘要	Wide areas of the Siberian Arctic shelf are covered by freshened surface water layers, which are among the largest in the World Ocean. River discharge is the main freshwater source for formation of these layers; therefore, they are commonly referred to as river plumes (the Ob-Yenisei plume in the Kara Sea and the Lena plume in the Laptev and East Siberian seas). The contribution of sea ice meltwater (SIM) to the Ob-Yenisei and Lena plumes is pointed out to be small, albeit its actual volume remains unknown. In this study, we use a novel dataset of satellite-derived sea ice thickness in the Arctic Ocean during the melt period to quantify the annual volume of SIM, which was received by the Ob-Yenisei and Lena plumes during 2012-2020. We reveal that SIM is a significant source for the Lena plume providing, on average, 20% of total annual freshwater content. Moreover, the share of SIM in the Lena plume shows large inter-annual (14%-29%) variability, i.e., during certain years, SIM provides almost one-third of freshwater volume of the Lena plume. This variability is governed by inter-annual variability of ice thickness, as well as seasonal variability of sea ice melting conditions. Conversely, the contribution of SIM to the Ob-Yenisei plume is relatively low (8% on average), and its total annual share varies from 6% to 11% during the study period. This difference is mainly caused by significantly smaller area of the Ob-Yenisei plume as compared with the Lena plume. The forecasted earlier onset of ice melting in the Arctic Ocean in future decades due to climate change could decrease the contribution of SIM to the Ob-Yenisei plume, whereas its influence on the Lena plume remains unclear.
英文关键词	freshened surface layer; sea ice meltwater; river discharge; Ob-Yenisei plume; Lena plume; Arctic Ocean
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:001190317800001
来源期刊	FRONTIERS IN MARINE SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304660
作者单位	Russian Academy of Sciences; Shirshov Institute of Oceanology; Moscow Institute of Physics & Technology; Russian Academy of Sciences; Institute of Geology of Ore Deposits, Petrography, Mineralogy & Geochemistry; Lomonosov Moscow State University; Arctic & Antarctic Research Institute
推荐引用方式 GB/T 7714	Osadchiev, Alexander,Kuskova, Ekaterina,Ivanov, Vladimir. The roles of river discharge and sea ice melting in formation of freshened surface layers in the Kara, Laptev, and East Siberian seas[J],2024,11.
APA	Osadchiev, Alexander,Kuskova, Ekaterina,&Ivanov, Vladimir.(2024).The roles of river discharge and sea ice melting in formation of freshened surface layers in the Kara, Laptev, and East Siberian seas.FRONTIERS IN MARINE SCIENCE,11.
MLA	Osadchiev, Alexander,et al."The roles of river discharge and sea ice melting in formation of freshened surface layers in the Kara, Laptev, and East Siberian seas".FRONTIERS IN MARINE SCIENCE 11(2024).