Other
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.2179r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 47, Issue 12, pp.2179-2188
Other
3
Scientific paper
Nitrous oxide supersaturation was measured in the Bothnian Bay, Bothnian Sea and four depth zones of the Baltic proper along with O 2 , NO - 3 , NO - 2 and other parameters useful in interpreting the sources of the N 2 O. In the Baltic Sea supersaturation of N 2 O (123%) was found in the surface water of 0 to 0.5 m. The supersaturation resulted in a flux of N 2 O to the atmosphere of 2.8 × 10 -2 Tg N · yr -1 which was 5% of the estimated total nitrogen loss for the Baltic. For the entire photic zone (0 to 20 m) the N 2 O saturation was 135%. The source of the N 2 O is not clear, as the nitrification and denitrification were ruled out as sources. The N 2 O saturation was the lowest (118%) in the intermediate zone. Nitrification appears to be the likely N 2 O sorce in this region. At the halocline zone, an increasing oversaturation of N 2 O (200 to 300%) correlated with decreasing O 2 concentrations and increasing NO - 3 concentrations, indications of nitrification. Of the NH + 4 that was oxidized to NO - 3 , 0.56% was produced as N 2 O. In the deep water zone, the supersaturation of N 2 O remained very high (150 to 200%). Sufficient O 2 , high NO - 3 and the presence of nitrifying activity suggested nitrification as most likely source, however in deeper waters of this zone where oxygen was less than 2% saturation the N 2 O production could be due to denitrification. In anoxic waters the N 2 O concentrations rapidly decreased to zero suggesting N 2 O consumption by denitrification, further evidenced by a developing nitrate anomaly.
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