Magnitude of and Hydroclimatic Controls on CO2 and CH4 Emissions in the Subtropical Monsoon Pearl River Basin

亚热带 季风 珍珠 气候学 环境科学 构造盆地 流域 大气科学 地理 地质学 地貌学 地图学 考古 渔业 生物
作者
Shuai Chen,Lishan Ran,Jun Zhong,Boyi Liu,Xiankun Yang,Ping Yang,Mingyang Tian,Qianqian Yang,Si‐Liang Li,Zhifeng Yan,Nufang Fang
出处
期刊:Journal Of Geophysical Research: Biogeosciences [Wiley]
卷期号:129 (5) 被引量:2
标识
DOI:10.1029/2023jg007967
摘要

Abstract Rivers are important ecosystems for carbon emissions and play a crucial role in the global carbon cycle. However, CO 2 and CH 4 emissions from subtropical rivers are substantially under‐represented in global‐scale estimates. Here, we explored the regional patterns of riverine CO 2 and CH 4 dynamics in the Pearl River basin with a subtropical monsoon climate. We found that its CO 2 and diffusive CH 4 emissions showed a decreasing trend with increasing stream order. Seasonality in CO 2 and diffusive CH 4 emissions was primarily driven by variations in partial pressure of CO 2 ( p CO 2 ) and CH 4 ( p CH 4 ) and gas transfer velocities, which were strongly regulated by hydrology and climate. We further estimated the basin‐wide CO 2 and diffusive CH 4 fluxes at 17.8 ± 7.4 Tg C yr −1 and 191.5 ± 139.9 Gg C yr −1 , respectively. When normalized to the water surface, the mean diffusive fluxes were 790.1 and 8.5 mmol m −2 d −1 for CO 2 and CH 4 , respectively, which were 1.3 and 2.5 times higher than the global mean riverine CO 2 and CH 4 fluxes, respectively. This suggests that the global significance of subtropical rivers is probably underestimated because their substantially higher CH 4 fluxes are unaccounted for. Furthermore, compared with measured p CO 2 , the alkalinity‐based p CO 2 could introduce significant errors by 20% at ∼30% of the sampling sites, underscoring the necessity of direct measurements to reduce uncertainty. This study provides the first estimate of basin‐wide CO 2 and diffusive CH 4 emissions in the PRB through direct p CO 2 and p CH 4 measurements, and highlights the role of hydrologic and climatic factors in governing riverine carbon emissions.
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