1Department of Oceanography, University of Hawaii, Honolulu, Hawaii 96822, USA
2South Florida Natural Resources Center, Everglades National Park, Homestead, Florida 33030, USA
3Southeast Environmental Research Center, Florida International University, Miami, Florida 33199, USA
4Department of Earth and Environment, Florida International University, Miami, Florida 33199, USA
5Marine Geosciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149, USA
6NOAA Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida 33149, USA
anow at: U.S. Geological Survey, Wetland and Aquatic Research Center, Gainesville, Florida 32653, USA
Received: 10 Jan 2017 – Accepted: 10 Jan 2017 – Published: 11 Jan 2017
Abstract. The Shark and Harney Rivers, located on the southwest coast of Florida, USA, originate in the freshwater, karstic marshes of the Everglades and flow through the largest contiguous mangrove forest in North America. In November 2010 and 2011, dissolved carbon source-sink dynamics were examined in these rivers during SF6 tracer release experiments. Approximately 80 % of the total dissolved carbon flux from all sources (i.e., freshwater wetlands, mangrove, carbonate dissolution, and marine input) out of the Shark and Harney Rivers during these experiments was as inorganic carbon, either via air-water CO2 exchange or longitudinal flux of inorganic carbon to the coastal ocean. Of the total mangrove-derived dissolved inorganic carbon (DIC) exported from the forests into these rivers, between 42 and 48 % was emitted to the atmosphere, with the remaining discharged to the coastal ocean. Dissolved organic carbon (DOC) represented ca. 10 % of the total mangrove-derived dissolved carbon export from the forests. The sum of mangrove-derived DIC and DOC export to these rivers was estimated to be at least 18.9 to 24.5 mmol m−2 d−1, a rate lower than other independent estimates from Shark River and from other mangrove forests. Results from these experiments also suggest that in this region, mangrove contribution to the estuarine flux of dissolved carbon to the ocean is less than 10 %.
Ho, D. T., Ferrón, S., Engel, V. C., Anderson, W. T., Swart, P. K., Price, R. M., and Barbero, L.: Dissolved carbon biogeochemistry and export in mangrove-dominated rivers of the Florida Everglades, Biogeosciences Discuss., doi:10.5194/bg-2017-6, in review, 2017.
Latest update: 19 Jan 2017