Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers
Abstract Anthropogenic perturbations have substantially altered riverine carbon cycling worldwide, exerting influences on dissolved carbon dioxide (CO2) and methane (CH4) dynamics at multiple levels. However, the magnitude and role of anthropogenic activities in modulating carbon emissions across en...
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | Water Resources Research |
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| Online Access: | https://doi.org/10.1029/2024WR038341 |
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| author | Shuai Chen Lishan Ran Clément Duvert Boyi Liu Yongli Zhou Xiankun Yang Qianqian Yang Yuxin Li Si‐Liang Li |
| author_facet | Shuai Chen Lishan Ran Clément Duvert Boyi Liu Yongli Zhou Xiankun Yang Qianqian Yang Yuxin Li Si‐Liang Li |
| author_sort | Shuai Chen |
| collection | DOAJ |
| description | Abstract Anthropogenic perturbations have substantially altered riverine carbon cycling worldwide, exerting influences on dissolved carbon dioxide (CO2) and methane (CH4) dynamics at multiple levels. However, the magnitude and role of anthropogenic activities in modulating carbon emissions across entire river networks, as well as the influence of climatic controls, remain largely unresolved. Here, we explore the controlling factors of riverine CO2 and CH4 dynamics across 62 subtropical, monsoon‐influenced streams and rivers through basin‐wide seasonal measurements. We found that land use and aquatic metabolism played significant roles in regulating the spatial and temporal patterns of both gases. Increased nutrient levels and organic matter contributed to higher partial pressure of CO2 (pCO2) and CH4 (pCH4). Dissolved oxygen, stable carbon isotope of dissolved inorganic carbon, the proportion of impervious surface, catchment slope, and river width were the major predictors for pCO2. For pCH4, the major predictors were Chlorophyll a and water temperature, which influence organic matter availability and methanogenesis. Seasonal variations in pCO2 and pCH4 were strongly modulated by hydroclimatic conditions, with temperature markedly regulating river ecosystem metabolism. These findings highlight the likelihood of significant changes in riverine carbon emissions as climate changes and land use patterns evolve, thereby profoundly affecting the global carbon cycle. |
| format | Article |
| id | doaj-art-11ec8d42490344ccb91379aecc40fe3a |
| institution | DOAJ |
| issn | 0043-1397 1944-7973 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Water Resources Research |
| spelling | doaj-art-11ec8d42490344ccb91379aecc40fe3a2025-08-20T03:22:12ZengWileyWater Resources Research0043-13971944-79732025-01-01611n/an/a10.1029/2024WR038341Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon RiversShuai Chen0Lishan Ran1Clément Duvert2Boyi Liu3Yongli Zhou4Xiankun Yang5Qianqian Yang6Yuxin Li7Si‐Liang Li8Department of Geography The University of Hong Kong Hong Kong ChinaDepartment of Geography The University of Hong Kong Hong Kong ChinaResearch Institute for the Environment and Livelihoods Charles Darwin University Darwin NT AustraliaDepartment of Geography The University of Hong Kong Hong Kong ChinaDepartment of Geography The University of Hong Kong Hong Kong ChinaSchool of Geography and Remote Sensing Guangzhou University Guangzhou ChinaDepartment of Geography The University of Hong Kong Hong Kong ChinaDepartment of Geography The University of Hong Kong Hong Kong ChinaInstitute of Surface‐Earth System Science School of Earth System Science Tianjin University Tianjin ChinaAbstract Anthropogenic perturbations have substantially altered riverine carbon cycling worldwide, exerting influences on dissolved carbon dioxide (CO2) and methane (CH4) dynamics at multiple levels. However, the magnitude and role of anthropogenic activities in modulating carbon emissions across entire river networks, as well as the influence of climatic controls, remain largely unresolved. Here, we explore the controlling factors of riverine CO2 and CH4 dynamics across 62 subtropical, monsoon‐influenced streams and rivers through basin‐wide seasonal measurements. We found that land use and aquatic metabolism played significant roles in regulating the spatial and temporal patterns of both gases. Increased nutrient levels and organic matter contributed to higher partial pressure of CO2 (pCO2) and CH4 (pCH4). Dissolved oxygen, stable carbon isotope of dissolved inorganic carbon, the proportion of impervious surface, catchment slope, and river width were the major predictors for pCO2. For pCH4, the major predictors were Chlorophyll a and water temperature, which influence organic matter availability and methanogenesis. Seasonal variations in pCO2 and pCH4 were strongly modulated by hydroclimatic conditions, with temperature markedly regulating river ecosystem metabolism. These findings highlight the likelihood of significant changes in riverine carbon emissions as climate changes and land use patterns evolve, thereby profoundly affecting the global carbon cycle.https://doi.org/10.1029/2024WR038341greenhouse gasescarbon dynamicshydrologic conditionssubtropical riversland useaquatic metabolism |
| spellingShingle | Shuai Chen Lishan Ran Clément Duvert Boyi Liu Yongli Zhou Xiankun Yang Qianqian Yang Yuxin Li Si‐Liang Li Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers Water Resources Research greenhouse gases carbon dynamics hydrologic conditions subtropical rivers land use aquatic metabolism |
| title | Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers |
| title_full | Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers |
| title_fullStr | Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers |
| title_full_unstemmed | Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers |
| title_short | Anthropogenic and Hydroclimatic Controls on the CO2 and CH4 Dynamics in Subtropical Monsoon Rivers |
| title_sort | anthropogenic and hydroclimatic controls on the co2 and ch4 dynamics in subtropical monsoon rivers |
| topic | greenhouse gases carbon dynamics hydrologic conditions subtropical rivers land use aquatic metabolism |
| url | https://doi.org/10.1029/2024WR038341 |
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