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Carbon monoxide cycling in the Ria Formosa Lagoon (southern Portugal) during summer 2021
Li, G.; Arevalo-Martinez, D.L.; Ingeniero, R.C.O.; Bange, H.W. (2023). Carbon monoxide cycling in the Ria Formosa Lagoon (southern Portugal) during summer 2021. EGUsphere (preprints) (Preprint): 1-24. https://dx.doi.org/10.5194/egusphere-2023-771
In: EGUsphere (preprints). European Geosciences Union.
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Documenttype: Preprint
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| Auteurs | | Top |
- Li, G.
- Arevalo-Martinez, D.L.
- Ingeniero, R.C.O.
- Bange, H.W.
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| Abstract |
Carbon monoxide (CO) is an atmospheric trace gas that plays a crucial role in the oxidizing capacity of the Earth’s atmosphere. Moreover, it functions as an indirect greenhouse gas, influencing the lifetimes of potent greenhouse gases such as methane. Albeit being an overall source of atmospheric CO, the role of coastal regions in the marine cycling of CO and how its budget can be affected by anthropogenic activities, remain uncertain. Here, we present the first measurements of dissolved CO in the Ria Formosa Lagoon, an anthropogenically influenced system in southern Portugal. The dissolved CO concentrations in the surface layer ranged from 0.16 to 3.1 nmol L−1 with an average concentration of 0.75 ± 0.57 nmol L−1. The CO saturation ratio ranged from 1.7 to 32.2, indicating that the lagoon acted as a source of CO to the atmosphere in May 2021. The estimated average sea-to-air flux density was 1.53 μmol m−2 d−1, mainly fueled by CO photochemical production. Microbial consumption accounted for 83 % of the CO production, suggesting that the resulting CO emissions to the atmosphere were modulated by microbial consumption in the surface waters of the Ria Formosa Lagoon. The results from an irradiation experiment with aquaculture effluent water indicated that aquaculture facilities in the Ria Formosa Lagoon seem to be a negligible source of atmospheric CO. |
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