Mechanisms controlling air-sea gas exchange in the Baltic Sea

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Gutiérrez-Loza, LucíaUppsala universitet,Luft-, vatten- och landskapslära (author)

Mechanisms controlling air-sea gas exchange in the Baltic Sea

BookEnglish2020

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Uppsala universitet,2020
39 s.
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:uu-409744
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-409744URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:vet swepub-contenttype
Subject category:lic swepub-publicationtype

Notes

Carbon plays a major role in physical and biogeochemical processes in the atmosphere, the biosphere, and the ocean. CO2 and CH4 are two of the most common carbon-containing compounds in the atmosphere, also recognized as major greenhouse gases. The exchange of CO2 and CH4 between the ocean and the atmosphere is an essential part of the global carbon cycle. The exchange is controlled by the air–sea concentration gradient and by the efﬁciency of the transfer processes. The lack of knowledge about the forcing mechanisms affecting the exchange of these climate-relevant gases is a major source of uncertainty in the estimation of the global oceanic contributions. Quantifying and understanding the air–sea exchange processes is essential to constrain the estimates and to improve our knowledge about the current and future climate. In this thesis, the mechanisms controlling the air–sea gas exchange in the Baltic Sea are investigated.The viability of micrometeorological techniques for CH4 monitoring in a coastal environment is evaluated. One year of semi-continuous measurements of air–sea CH4 ﬂuxes using eddy covariance measurements suggests that the method is useful for CH4 ﬂux estimations in marine environments. The measurements allow long-term monitoring at high frequency rates, thus, capturing the temporal variability of the ﬂux. The region off Gotland is a net source of CH4, with both the air–sea concentration gradient and the wind as controlling mechanisms.A sensitivity analysis of the gas transfer velocity is performed to evaluate the effect of the forcing mechanisms controlling the air–sea CO2 exchange in the Baltic Sea. This analysis shows that the spatio-temporal variability of CO2 ﬂuxes is strongly modulated by water-side convection, precipitation, and surfactants. The effect of these factors is relevant both at regional and global scales, as they are not included in the current budget estimates.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
Air-sea gas exchange
Baltic Sea
CO2 flux
methane flux

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Rutgersson, Anna,1971-Uppsala universitet,Luft-, vatten- och landskapslära(Swepub:uu)aru27058 (thesis advisor)
Sahlée, ErikUppsala universitet,Luft-, vatten- och landskapslära(Swepub:uu)ersah499 (thesis advisor)
Wallin, Marcus,1979-Uppsala universitet,Luft-, vatten- och landskapslära,Limnologi(Swepub:uu)marwa654 (thesis advisor)
Prytherch, John,Research EngineerDepartment of Meteorology (MISU), Stockholm University (opponent)
Uppsala universitetLuft-, vatten- och landskapslära (creator_code:org_t)

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