Export of nutrients and suspended solids from major Arctic rivers and their response to permafrost degradation

作     者：ZHANG Shu-Min MU Cui-Cui LI Zhi-Long DONG Wen-Wen WANG Xing-Yu Irina STRELETSKAYA Valery GREBENETS Sergey SOKRATOV Alexander KIZYAKOV WU Xiao-Dong ZHANG Shu-Min;MU Cui-Cui;LI Zhi-Long;DONG Wen-Wen;WANG Xing-Yu;Irina STRELETSKAYA;Valery GREBENETS;Sergey SOKRATOV;Alexander KIZYAKOV;WU Xiao-Dong

作者机构：Key Laboratory of Western China's Environmental Systems(Ministry of Education)College of Earth and Environmental SciencesLanzhou UniversityLanzhou730000China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai519000China Cryosphere Research Station on the Qinghai-Tibetan PlateauState Key Laboratory of Cryospheric ScienceNorthwest Institute of Eco-Environment and ResourceChinese Academy of SciencesLanzhou730000China University Cooperation of Polar ResearchBeijing100875China Geographical FacultyLomonosov Moscow State UniversityMoscow119991Russia 

出 版 物：《Advances in Climate Change Research》 (气候变化研究进展（英文版）)

年 卷 期：2021年第12卷第4期

页      面：466-474页

核心收录：

学科分类：07[理学] 0705[理学-地理学] 070501[理学-自然地理学] 

基　　金：the National Key Research and Development Program of China(2019YFA0607003) the National Natural Science Foundation of China(41941015,32061143032) the West Light Foundation of the Chinese Academy of Sciences,and Russian Fund for Basic Research(18-05-60080) State topic N AAAA-A16-116032810095-6 

主　　题：Arctic rivers Carbonate Nutrients Total suspended solids Permafrost 

摘      要：The rapid warming of the Arctic has led to permafrost degradation,accelerating the transport of terrestrial materials by *** quan-titative assessment of riverine nutrients and total suspended solids(TSS)flux is important to clarify the land-ocean connections in the ***,much is unknown about the estimates of these components from direct measurements in the Arctic rivers and the response of the components to permafrost ***,we report the results from the Arctic Great Rivers Observatory(Arctic-GRO)for the six major Arctic rivers(Yenisey,Lena,Ob ,Mackenzie,Yukon,and Kolyma)to investigate the riverine exports of TSS,total dissolved nitrogen(TDN),nitrate(NO3-),bicarbonate(HCO3-),total dissolved phosphorus(TDP),and phosphate(PO43-).The results showed that from 2004 to 2017,the annual TSS,TDN,and NO3-exports to the Arctic Ocean were approximately 106,026 Gg,692 Gg,and 130 Gg,respectively,and the HCO3-,TDP,and PO43-exports were approximately 79,092 Gg,32 Gg,and 18 Gg,*** were remarkable variations in component concentrations and fluxes between *** than 80%of the TDN,TDP,PO43,and TSS exports mainly occurred in spring and summer,and a high HCO3-flux was recorded in summer,while a high NO3-flux in some rivers occurred in *** active layer thickness was significantly positively correlated with the annual TDN,NO3-,and *** addition,the HCO3-flux of the six Arctic rivers increased by 247 Gg per year during *** positive relationship between the active layer thickness and river discharge indicates that permafrost degradation accelerated rivefine carbonate,nitrogen,and phosphorus *** study demonstrates that riverine exports play an important role both in the Arctic terrestrial and marine ecosystems,and permafrost degradation will likely increase the riverine material exports to the ocean.