INVESTIGADORES
LARA Ruben Jose
artículos
Título:
Spring distribution of dissolved organic matter in a system encompassing the Northeast Water Polynya: Implications for early-season sources and sinks
Autor/es:
SKOOG, ANNELIE; WEDBORG, M.; LARA, RUBÉN JOSÉ; KATTNER, GERHARD
Revista:
MARINE CHEMISTRY
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2005 p. 175 - 188
ISSN:
0304-4203
Resumen:
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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 temperaturesalinity
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
μM, n=68)
than surface water (SW) outside the polynya area (96±18
μM, 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 ~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
~80% of early-season DOC and 90100% 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.