CDOM distribution and CO 2 production on the Southwest Florida Shelf

Catherine D. Clark, William T. Hiscock, Frank J Millero, Gary Hitchcock, Larry E Brand, William L. Miller, Lori Ziolkowski, Robert F. Chen, Rod G. Zika

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Partial pressures of carbon dioxide (pCO 2) were measured in river and coastal waters on two cruises in November 1999 and June 2000 on the Southwest Florida Shelf. Supersaturation with respect to the atmosphere was observed for most river and near-shore waters in November 1999. pCO 2 ranged from 403 μatm in the Gulf of Mexico to 1280 μatm in the Shark River. The coastal waters of the Southwest Florida Shelf had unusually low salinities at this time due to high inputs of freshwater runoffs after Hurricane Irene. In general, pCO 2 levels decreased with increasing salinity, but at different gradients for the different river systems. In June 2000, salinity gradients were considerably reduced during this drought year, with hypersalinity indicating reduced freshwater inputs. However, high pCO 2 levels were still observed in and near the mouth of the Shark River (pCO 2=383-1280 μatm). A positive correlation of pCO 2 levels with colored dissolved organic matter (CDOM) and chlorophyll was observed in all systems examined. CO 2 in natural waters may be produced from the photochemical degradation of CDOM, microbial respiration or via shifts in the carbonate equilibrium. Some evidence for a small contribution from photochemical production was observed in the Shark River mouth in a dry season diel study, but not in the wet season. Differences between the rivers are primarily attributed to the significantly higher total alkalinity and lower pH values in the Shark River, and associated higher pCO 2 levels. In general, spatial variability in pCO 2 is dominated by the chemical characteristics of the river inputs, with temporal variability modulated by changes in pH, photochemical production in low flow seasons and draw down by primary production.

Original languageEnglish
Pages (from-to)145-167
Number of pages23
JournalMarine Chemistry
Volume89
Issue number1-4
DOIs
StatePublished - Oct 1 2004

Fingerprint

Carbon Monoxide
dissolved organic matter
Biological materials
Rivers
shark
river
salinity
Water
coastal water
freshwater input
supersaturation
distribution
partial pressure
wet season
low flow
hurricane
river system
alkalinity
Drought
Hurricanes

Keywords

  • CDOM distribution
  • CO production
  • Southwest Florida Shelf

ASJC Scopus subject areas

  • Chemistry(all)
  • Oceanography

Cite this

Clark, C. D., Hiscock, W. T., Millero, F. J., Hitchcock, G., Brand, L. E., Miller, W. L., ... Zika, R. G. (2004). CDOM distribution and CO 2 production on the Southwest Florida Shelf. Marine Chemistry, 89(1-4), 145-167. https://doi.org/10.1016/j.marchem.2004.02.011

CDOM distribution and CO 2 production on the Southwest Florida Shelf. / Clark, Catherine D.; Hiscock, William T.; Millero, Frank J; Hitchcock, Gary; Brand, Larry E; Miller, William L.; Ziolkowski, Lori; Chen, Robert F.; Zika, Rod G.

In: Marine Chemistry, Vol. 89, No. 1-4, 01.10.2004, p. 145-167.

Research output: Contribution to journalArticle

Clark, CD, Hiscock, WT, Millero, FJ, Hitchcock, G, Brand, LE, Miller, WL, Ziolkowski, L, Chen, RF & Zika, RG 2004, 'CDOM distribution and CO 2 production on the Southwest Florida Shelf', Marine Chemistry, vol. 89, no. 1-4, pp. 145-167. https://doi.org/10.1016/j.marchem.2004.02.011
Clark CD, Hiscock WT, Millero FJ, Hitchcock G, Brand LE, Miller WL et al. CDOM distribution and CO 2 production on the Southwest Florida Shelf. Marine Chemistry. 2004 Oct 1;89(1-4):145-167. https://doi.org/10.1016/j.marchem.2004.02.011
Clark, Catherine D. ; Hiscock, William T. ; Millero, Frank J ; Hitchcock, Gary ; Brand, Larry E ; Miller, William L. ; Ziolkowski, Lori ; Chen, Robert F. ; Zika, Rod G. / CDOM distribution and CO 2 production on the Southwest Florida Shelf. In: Marine Chemistry. 2004 ; Vol. 89, No. 1-4. pp. 145-167.
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