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| Titel |
Rapid accretion of dissolved organic carbon in the springs of Florida: the most organic-poor natural waters |
| VerfasserIn |
C. M. Duarte, Y. T. Prairie, T. K. Frazer, M. V. Hoyer, S. K. Notestein, R. Martínez, A. Dorsett, D. E. Canfield |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 12 ; Nr. 7, no. 12 (2010-12-20), S.4051-4057 |
| Datensatznummer |
250005108
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| Publikation (Nr.) |
 copernicus.org/bg-7-4051-2010.pdf |
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| Zusammenfassung |
| The concentration of dissolved organic carbon (DOC) in groundwater emanating
as spring discharge at several locations in Florida, USA and the net
increase in DOC in the downstream receiving waters were measured as part of
a larger investigation of carbon dynamics in flowing waters. Springs with
high discharge (>2.8 m3 s−1) were found to be the most
organic-poor natural waters yet reported (13 ± 1.6 μmol C L−1),
while springs with lesser discharge exhibited somewhat higher DOC
concentrations (values ranging from 30 to 77 μmol C L−1). DOC
concentrations increased rapidly downstream from the point of spring
discharge, with the calculated net areal input rate of DOC ranging from 0.04
to 1.64 mol C m−2 d−1 across springs. Rates of DOC increase were
generally greater in those springs with high discharge rates. These input
rates compare favorably with values reported for gross primary production in
these macrophyte-dominated spring systems, assuming that 17% of
macrophyte primary production is lost, on average, as DOC. The measures
reported here are possible only because of the remarkably low DOC levels in
the up-surging groundwaters and the short residency times of the water in
the spring-runs themselves. |
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