Abstract
<p>Recent studies show that groundwater depletion is an unreported source of atmospheric CO<sub>2</sub> through bicarbonate reactions in the groundwater released from aquifer. However, the depletion can be mitigated or offset by recharge, and thus the contrasting roles of depletion and recharge on carbon cycle remain unclear at a national scale. Here, we extend previous studies to use the satellite�Cderived groundwater storage change (GWSC) and substantial in situ measurements of the bicarbonate ion concentration (BIC), for the first time evaluation of GWSC�Cinduced CO<sub>2</sub> emission/sequestration in China. Results show that the GWSC represents as a significant source of atmospheric CO<sub>2</sub> in China, with a net CO<sub>2</sub> emission rate of 2.1��2.3 Mt/yr, which is larger than 15% of the emission sources listed in China Carbon Emission Accounts and Datasets. Besides, emission and sequestration induced by groundwater storage (GWS) decrease and increase is also significant, with a rate of 3.9��1.1 Mt/yr and 1.8��1.2 Mt/yr, respectively. Notably, we also find that China��s stricter groundwater measures can contribute a total reduction of 5.3 Mt CO<sub>2</sub> emission in the major overdraft areas by 2025. Despite of notable uncertainties, this study highlights the unneglectable contributions of GWSC to atmospheric CO<sub>2</sub> emission and sequestration at a national to global scale.</p>
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
