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Sources and emission of greenhouse gases in Danube Delta lakes.

Publikationsart Peer-reviewed
Publikationsform Originalbeitrag (peer-reviewed)
Autor/in Pavel A., Durisch-Kaiser E., Balan S., Radan S., Sobek S., Wehrli B.,
Projekt The role of lake sediments in the carbon cycle: organic carbon preservation and methane emission
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Originalbeitrag (peer-reviewed)

Zeitschrift Environmental science and pollution research international
Volume (Issue) 16 (Suppl 1)
Seite(n) S86 - S91
Titel der Proceedings Environmental science and pollution research international

Open Access

Abstract

Production of methane and carbon dioxide as well as methane concentrations in surface waters and emissions to the atmosphere were investigated in two flowthrough lake complexes (Uzlina–Isac and Puiu–Rosu–Rosulet) in the Danube Delta during post-flood conditionsin May and low water level in September 2006. Retainednutrients fuelled primary production and remineralisationof bioavailable organic matter. This led to an observablenet release of methane, particularly in the lakes Uzlina, Puiuand Rosu inMay. Input from the Danube River, from redbuds and benthic release contributed to CH4 concentrations insurface waters. In addition to significant river input of CO2, this trace gas was released via aerobic remineralisation within the water column and in top sediments. Emission patterns of CO2 widely overlapped with those of CH4. Generally, greenhouse gas emissions peaked in the lake complex adjacent to the Danube River in May due to strong winds and decreased with increasing hydrological distance from the Danube River. Intense remineralisation of organic matter in the Danube Delta lakes results in a net source of atmospheric greenhouse gases.
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