期刊
LIMNOLOGY AND OCEANOGRAPHY
卷 56, 期 3, 页码 867-886出版社
WILEY
DOI: 10.4319/lo.2011.56.3.0867
关键词
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资金
- National Science Foundation [[OCE] 0825600, OCE 0825403]
- office of the Dean of the Graduate School of the University of Minnesota
- Gledden Fellowship
- Division Of Ocean Sciences
- Directorate For Geosciences [825403, 0825600] Funding Source: National Science Foundation
This study applies radiocarbon and stable carbon isotopic distributions to investigate carbon sources and cycling within Lake Superior. We report the radiocarbon (Delta C-14) and stable carbon isotope (delta C-13) values and the carbon concentrations within dissolved organic carbon (DOC), particulate organic carbon (POC), and dissolved inorganic carbon (DIC) in the lake's western basin water column. Samples were taken during spring mixing and late-summer thermal stratification over a 2-yr period (2007-2009). Distinct processes operating in the surface (photosynthesis) and deep waters (sediment resuspension and pore-water intrusion) control the relative contribution of modern and ancient DOC and POC in the water column. The terrigenous carbon input to the open lake POC varied from 13% +/- 4% during late summer stratification to 9% +/- 3% during spring mixing, with most of the terrestrial carbon being C-14-enriched (modern). The DIC reservoir cycles rapidly, with a bulk Delta C-14(DIC) value that records atmospheric radiocarbon levels from 3 yr prior to sampling. The DOC pool recycles on a longer time scale than does the DIC, with a DOC residence time of <= 60 yr. The suspended POC was in most cases older than co-occurring DOC, most likely as a result of resuspension of lake sediments.
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