Journal
MARINE CHEMISTRY
Volume 177, Issue -, Pages 288-297Publisher
ELSEVIER
DOI: 10.1016/j.marchem.2015.06.001
Keywords
Marine dissolved organic matter; FT-ICR-MS; North Atlantic; Carbon cycle
Categories
Funding
- European Research Council under the European Community's Seventh Framework Program (FP7)/ERC [268595]
- Austrian Science Fund (FWF) [I486-B09]
- Austrian Science Fund (FWF) [Z194, I486] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [I 486, Z 194] Funding Source: researchfish
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Characterizing the composition of marine dissolved organic matter (DOM) is important for gaining insight into its role in oceanic biogeochemical cycles. Using Fourier transform ion cyclotron resonance mass spectrometry, we analyzed the molecular composition of solid phase extracted (SPE) DOM from the northeast Atlantic to investigate the specificity of the DOM pool of the individual major water masses of the North Atlantic. All 272 measured samples from depths ranging from 87 to 5609 m and latitudes from 24 degrees N to 68 degrees N shared 96% similarity (on a Bray-Curtis scale) in their DOM composition. Small variations between subsurface and deep samples and among latitudinal groupings were identified, but overall, water mass specific SPE-DOM composition was not apparent. A strong correlation between a calculated degradation index and water mass age indicates variability in portions of the DOM pool, and ocean-scale differences were observed between the North Atlantic and deep North Pacific. However, within the deep northeast Atlantic, conservative mixing primarily drives the molecular composition of SPE-DOM. (C) 2015 The Authors. Published by Elsevier B.V.
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