Air-sea exchange of carbon dioxide at the island of Utö in the Baltic Sea
Carbon dioxide is a key compound both in climate change and marine biological productivity. In the oceans, the sea-air exchange of carbon dioxide is driven by large-scale currents and changes in solubility, whereas in coastal seas, such as the Baltic Sea, biological activity has a significant effect...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/229079 2023-08-20T04:09:47+02:00 Air-sea exchange of carbon dioxide at the island of Utö in the Baltic Sea Honkanen, Martti Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Fysiikan laitos University of Helsinki, Faculty of Science, Department of Physics Helsingfors universitet, Matematisk-naturvetenskapliga fakulteten, Institutionen för fysik 2017 application/pdf http://hdl.handle.net/10138/229079 eng eng Helsingfors universitet University of Helsinki Helsingin yliopisto URN:NBN:fi-fe2017112251574 http://hdl.handle.net/10138/229079 Geophysics Geofysiikka Geofysik pro gradu-avhandlingar pro gradu -tutkielmat master's thesis 2017 ftunivhelsihelda 2023-07-28T06:32:22Z Carbon dioxide is a key compound both in climate change and marine biological productivity. In the oceans, the sea-air exchange of carbon dioxide is driven by large-scale currents and changes in solubility, whereas in coastal seas, such as the Baltic Sea, biological activity has a significant effect on the aquatic carbonate system. However, direct measurements of the sea-air exchange of carbon dioxide are difficult to carry out due to the small magnitude of the fluxes, waves, sea ice and sea spray that influence sensitive instruments. Eddy covariance method is a widely used direct method for measuring the fluxes of carbon dioxide. The sea-air fluxes of carbon dioxide are also commonly calculated using a parametrization based on wind speed. Finnish Marine Institute in collaboration with Finnish Environment Institute began to construct a new atmospheric and marine research station on Utö in the Archipelago Sea in 2012. The objective of this study is to determine the suitability of the new station to measure air-sea exchange of carbon dioxide and aquatic carbonate system. The air-sea fluxes of carbon dioxide were measured with three infrared gas analyzer set-ups during October-December 2016, and the fluxes were also calculated using a parametrization of gas transfer velocity. The aquatic carbonate system of the surface water during July-October 2016 was studied using dissolved carbon dioxide concentration and pH of the seawater measured in a flow-through pumping system. The dissolved carbon dioxide concentration was measured by using an equilibration chamber together with an infrared gas analyzer. The micrometeorological tower erected on the shore can be applied for measuring the sea-air fluxes of carbon dioxide in an open sea wind sector, which was determined based on the roughness length. The closed-path infrared gas analyzer (Licor LI-7000) works well in the hard coastal conditions, whereas an open-path analyzer (Licor LI-7500) had difficulties in measuring fluxes during showers and high relative humidity. The ... Master Thesis Sea ice Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
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Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Geophysics Geofysiikka Geofysik |
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Geophysics Geofysiikka Geofysik Honkanen, Martti Air-sea exchange of carbon dioxide at the island of Utö in the Baltic Sea |
topic_facet |
Geophysics Geofysiikka Geofysik |
description |
Carbon dioxide is a key compound both in climate change and marine biological productivity. In the oceans, the sea-air exchange of carbon dioxide is driven by large-scale currents and changes in solubility, whereas in coastal seas, such as the Baltic Sea, biological activity has a significant effect on the aquatic carbonate system. However, direct measurements of the sea-air exchange of carbon dioxide are difficult to carry out due to the small magnitude of the fluxes, waves, sea ice and sea spray that influence sensitive instruments. Eddy covariance method is a widely used direct method for measuring the fluxes of carbon dioxide. The sea-air fluxes of carbon dioxide are also commonly calculated using a parametrization based on wind speed. Finnish Marine Institute in collaboration with Finnish Environment Institute began to construct a new atmospheric and marine research station on Utö in the Archipelago Sea in 2012. The objective of this study is to determine the suitability of the new station to measure air-sea exchange of carbon dioxide and aquatic carbonate system. The air-sea fluxes of carbon dioxide were measured with three infrared gas analyzer set-ups during October-December 2016, and the fluxes were also calculated using a parametrization of gas transfer velocity. The aquatic carbonate system of the surface water during July-October 2016 was studied using dissolved carbon dioxide concentration and pH of the seawater measured in a flow-through pumping system. The dissolved carbon dioxide concentration was measured by using an equilibration chamber together with an infrared gas analyzer. The micrometeorological tower erected on the shore can be applied for measuring the sea-air fluxes of carbon dioxide in an open sea wind sector, which was determined based on the roughness length. The closed-path infrared gas analyzer (Licor LI-7000) works well in the hard coastal conditions, whereas an open-path analyzer (Licor LI-7500) had difficulties in measuring fluxes during showers and high relative humidity. The ... |
author2 |
Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Fysiikan laitos University of Helsinki, Faculty of Science, Department of Physics Helsingfors universitet, Matematisk-naturvetenskapliga fakulteten, Institutionen för fysik |
format |
Master Thesis |
author |
Honkanen, Martti |
author_facet |
Honkanen, Martti |
author_sort |
Honkanen, Martti |
title |
Air-sea exchange of carbon dioxide at the island of Utö in the Baltic Sea |
title_short |
Air-sea exchange of carbon dioxide at the island of Utö in the Baltic Sea |
title_full |
Air-sea exchange of carbon dioxide at the island of Utö in the Baltic Sea |
title_fullStr |
Air-sea exchange of carbon dioxide at the island of Utö in the Baltic Sea |
title_full_unstemmed |
Air-sea exchange of carbon dioxide at the island of Utö in the Baltic Sea |
title_sort |
air-sea exchange of carbon dioxide at the island of utö in the baltic sea |
publisher |
Helsingfors universitet |
publishDate |
2017 |
url |
http://hdl.handle.net/10138/229079 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
URN:NBN:fi-fe2017112251574 http://hdl.handle.net/10138/229079 |
_version_ |
1774723458870018048 |