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Spring distribution of dissolved organic matter in a system encompassing the Northeast Water Polynya: Implications for early-season sources and sinks

Artikel i vetenskaplig tidskrift
Författare A Skoog
Margareta Wedborg
R. Lara
G. Kattner
Publicerad i Marine Chemistry
Volym 94
Nummer/häfte 1-4
Sidor 175-188
Publiceringsår 2005
Publicerad vid Institutionen för kemi
Sidor 175-188
Språk en
Länkar <Go to ISI>://000229365700013
Ämnesord humic substances, dissolved organic carbon, dissolved organic nitrogen, biogeochemistry, polynya, Greenland, North East Water Polynya, EASTERN ATLANTIC-OCEAN, CENTRAL ARCTIC-OCEAN, SOUTHERN BALTIC SEA, WEST, FLORIDA SHELF, OPTICAL-PROPERTIES, FLUORESCENCE SPECTROSCOPY, BACTERIAL, PRODUCTION, GREENLAND SEA, VERTICAL-DISTRIBUTION, CARBON DISTRIBUTION
Ämneskategorier Kemi

Sammanfattning

This study addresses sources and diagenetic state of early-season dissolved organic matter (DOM) in the Northeast Water Polynya (NEWP) area northeast of Greenland from distributions of humic substance fluorescence (HSfl), dissolved organic carbon (DOC), and dissolved organic nitrogen (DON) in the water column inside and outside the NEWP area. The water masses of the polynya area had acquired their spring/summer temperature-salinity characteristics at the time of sampling, and also had individual, different DOM signatures. DOC concentrations were variable within and among water masses in the polynya area, indicating patchy local sources and sinks of DOC. PySW and polynya intermediate water (PyIW) had higher average DON concentrations and average lower C:N ratios than polynya bottom water (PyBW), indicating a larger fraction of fresh DOM in PySW and PyIW than in PyBW. Ice-covered, polynya area surface waters (PySW) had higher DOC concentrations (113 +/- 14 mu M, n=68) than surface water (SW) outside the polynya area (96 +/- 18 mu M, n=6). The DOM C:N ratios in a low-salinity, ice-melt subgroup of PySW samples indicate labile material, and these low-salinity surface waters appeared to have a local DOC and DON source. In contrast, HSfl was significantly lower inside than outside the NEWP area. Despite the lower HSfl values within the NEWP area, the PySW values were high when compared to open-ocean water. There were no local terrestrial sources for HSfl to the NEWP area and the East Greenland Current is therefore proposed as a likely source of allochtonous HSfl. When HSfl was used as a conservative tracer, up to similar to 70% of the water in PySW and PyIW was found to be derived from SW, which contains a high fraction of water from the East Greenland Current. Similarly, a mixing model based on HSfl indicated that similar to 80% of early-season DOC and 90-100% of early-season DON in PySW and PyIW were derived from SW, indicating a potentially high fraction of terrestrially-derived, relatively refractory DOM in the early-season NEWP area. (c) 2005 Elsevier B.V. All rights reserved.

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