期刊
CONTINENTAL SHELF RESEARCH
卷 215, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2021.104348
关键词
Amazon river plume; pCO(2); Carbon dioxide; Sea surface temperature; Sea surface salinity; SMOS
类别
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brazil (CAPES) [001]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [309684/2018-8]
- Gordon and Betty Moore Foundation Marine Microbial Initiative River-Ocean Continuum of the Amazon project (GBMF) [2293, 2928]
- Sao Paulo Research Foundation [FAPESP 2018/18491-4]
- US National Science Foundation [DEB1754317]
The study analyzed in situ measurements of CO2 in the Amazon River plume, evaluating the spatiotemporal distribution and sea-air gas exchange, and found significant impacts of climatic events on these processes.
Estimations of the global carbon budget include a quantitative understanding of the evolving processes that occur along river-to-ocean gradients. However, high spatiotemporal resolution observations of these processes are limited. Here we present in situ measurements of the partial pressure of CO2 (pCO(2)) made through the Amazon River plume (ARP) during different discharge seasons, from 2010 to 2012. We evaluated the spatiotemporal distribution of pCO(2) using Soil Moisture and Ocean Salinity (SMOS) satellite observations for each hydrologic period in the ARP. Regression models were used to estimate pCO(2) at the ARP for the period of 2010-2014. From these distributions we calculated sea-air gas exchange of CO2 between the plume waters and the atmosphere (F-co2(sea)). Intra-annual variability of Fseaco(2) was related to discharge at the river mouth and ocean currents as well as trade winds in the plume. Climatic events during the study period had a significant impact on the Fsea co(2). Including the plume area closer to the river mouth makes the ARP a net source of CO2 with an annual net sea-air flux of 8.6 +/- 7.1 Tg C y(-1) from 2011 to 2014.
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