Impacts of anthropogenic water regulation on global riverine dissolved organic carbon transport
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Published:2023-09-04
Issue:5
Volume:14
Page:897-914
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ISSN:2190-4987
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Container-title:Earth System Dynamics
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language:en
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Short-container-title:Earth Syst. Dynam.
Author:
You Yanbin, Xie ZhenghuiORCID, Jia BinghaoORCID, Wang Yan, Wang Longhuan, Li Ruichao, Yan Heng, Tian Yuhang, Chen Si
Abstract
Abstract. Anthropogenic water regulation activities, including
reservoir interception, surface water withdrawal, and groundwater
extraction, alter riverine hydrologic processes and affect dissolved organic
carbon (DOC) export from land to rivers and oceans. In this study, schemes
describing soil DOC leaching, riverine DOC transport, and anthropogenic
water regulation were developed and incorporated into the Community Land
Model 5.0 (CLM5.0) and the River Transport Model (RTM). Three simulations
by the developed model were conducted on a global scale from 1981–2013 to
investigate the impacts of anthropogenic water regulation on riverine DOC
transport. The validation results showed that DOC exports simulated by the
developed model were in good agreement with global river observations. The
simulations showed that DOC transport in most rivers was mainly influenced
by reservoir interception and surface water withdrawal, especially in
central North America and eastern China. Four major rivers, including the
Danube, Yangtze, Mississippi, and Ganges rivers, have experienced reduced
riverine DOC flows due to intense water management, with the largest effect
occurring in winter and early spring. In the Danube and Yangtze river
basins, the impact in 2013 was 4 to 5 times greater than in 1981, with
a retention efficiency of over 50 %. The Ob river basin was almost
unaffected. The total impact of anthropogenic water regulation reduced
global annual riverine DOC exports to the ocean by approximately
13.36 ± 2.45 Tg C yr−1, and this effect increased from 4.83 %
to 6.20 % during 1981–2013, particularly in the Pacific and Atlantic
oceans.
Funder
National Natural Science Foundation of China National Key Research and Development Program of China Youth Innovation Promotion Association of the Chinese Academy of Sciences
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
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