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| Titel |
One year of continuous measurements constraining methane emissions from the Baltic Sea to the atmosphere using a ship of opportunity |
| VerfasserIn |
W. Gülzow, G. Rehder, J. Schneider v. Deimling, T. Seifert, Z. Toth |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 1 ; Nr. 10, no. 1 (2013-01-08), S.81-99 |
| Datensatznummer |
250017460
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| Publikation (Nr.) |
 copernicus.org/bg-10-81-2013.pdf |
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| Zusammenfassung |
| Methane and carbon dioxide were measured with an autonomous and
continuous running system on a ferry line crossing the Baltic Sea on
a 2–3 day interval from the Mecklenburg Bight to the Gulf of
Finland in 2010. Surface methane saturations show great seasonal
differences in shallow regions like the Mecklenburg Bight
(103–507%) compared to deeper regions like the Gotland Basin
(96–161%). The influence of controlling parameters like
temperature, wind, mixing depth and processes like upwelling, mixing
of the water column and sedimentary methane emissions on methane
oversaturation and emission to the atmosphere are
investigated. Upwelling was found to influence methane surface
concentrations in the area of Gotland significantly during the summer
period. In February 2010, an event of elevated methane concentrations
in the surface water and water column of the Arkona Basin was
observed, which could be linked to a wind-derived water level change
as a potential triggering mechanism. The Baltic Sea is a source of
methane to the atmosphere throughout the year, with highest fluxes occurring during the winter season. Stratification was found to promote the
formation of a methane reservoir in deeper regions like Gulf of
Finland or Bornholm Basin, which leads to long lasting elevated
methane concentrations and enhanced methane fluxes, when mixed to the
surface during mixed layer deepening in autumn and winter. Methane
concentrations and fluxes from shallow regions like the Mecklenburg
Bight are predominantly controlled by sedimentary production and consumption
of methane, wind events and the change in temperature-dependent
solubility of methane in the surface water. Methane fluxes vary
significantly in shallow regions (e.g. Mecklenburg Bight) and regions
with a temporal stratification (e.g. Bornholm Basin, Gulf of
Finland). On the contrary, areas with a permanent stratification like
the Gotland Basin show only small seasonal fluctuations in methane
fluxes. |
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