碳循环
环境科学
流域
水文学(农业)
溶解有机碳
总有机碳
北极的
气候变化
干旱
全球变化
全球变暖
碳纤维
海洋学
生态学
地质学
环境化学
生态系统
地理
化学
材料科学
地图学
岩土工程
复合数
复合材料
生物
作者
Wim Joost van Hoek,Junjie Wang,Lauriane Vilmin,Arthur Beusen,José M. Mogollón,Gerrit Müller,Philip Píka,Xiaochen Liu,Joep Langeveld,A. F. Bouwman,Jack J. Middelburg
标识
DOI:10.1021/acs.est.1c04605
摘要
Rivers play an important role in the global carbon (C) cycle. However, it remains unknown how long-term river C fluxes change because of climate, land-use, and other environmental changes. Here, we investigated the spatiotemporal variations in global freshwater C cycling in the 20th century using the mechanistic IMAGE-Dynamic Global Nutrient Model extended with the Dynamic In-Stream Chemistry Carbon module (DISC-CARBON) that couples river basin hydrology, environmental conditions, and C delivery with C flows from headwaters to mouths. The results show heterogeneous spatial distribution of dissolved inorganic carbon (DIC) concentrations in global inland waters with the lowest concentrations in the tropics and highest concentrations in the Arctic and semiarid and arid regions. Dissolved organic carbon (DOC) concentrations are less than 10 mg C/L in most global inland waters and are generally high in high-latitude basins. Increasing global C inputs, burial, and CO2 emissions reported in the literature are confirmed by DISC-CARBON. Global river C export to oceans has been stable around 0.9 Pg yr–1. The long-term changes and spatial patterns of concentrations and fluxes of different C forms in the global river network unfold the combined influence of the lithology, climate, and hydrology of river basins, terrestrial and biological C sources, in-stream C transformations, and human interferences such as damming.
科研通智能强力驱动
Strongly Powered by AbleSci AI