Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 13, issue 3
Biogeosciences, 13, 865-871, 2016
https://doi.org/10.5194/bg-13-865-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 13, 865-871, 2016
https://doi.org/10.5194/bg-13-865-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 15 Feb 2016

Research article | 15 Feb 2016

Temperature dependence of the relationship between pCO2 and dissolved organic carbon in lakes

L. Pinho1,2,3, C. M. Duarte2,4, H. Marotta5,6, and A. Enrich-Prast1,7 L. Pinho et al.
  • 1Postgraduate Program in Ecology, Department of Ecology, Institute of Biology, Federal University of Rio de Janeiro, Av. Carlos Chagas Filho, 373, Cidade Universitária (Ilha do Fundão), P. O. Box 68020, Rio de Janeiro – RJ, 21941-901, Brazil
  • 2Global Change Department, IMEDEA (CSIC-UIB), Mediterranean Institute for Advanced Studies, C. Miquel Marquès, 21, 07190 Esporles, Balearic Islands, Spain
  • 3Department of Chemical Oceanography, Rio de Janeiro State University, Pavilhão João Lyra Filho, sala 4008 Bloco E, Rua São Francisco Xavier, 524, Maracanã – RJ, 20550-900, Brazil
  • 4King Abdullah University of Science and Technology (KAUST), Red Sea Research Center (RSRC), Thuwal 23955-6900, Saudi Arabia
  • 5Research Center on Biomass and Water Management (NAB/UFF), Sedimentary Environmental Processes Laboratory (LAPSA/UFF), International Laboratory of Global Change (LINC Global), Federal Fluminense University, Av. Litorânea s/n, Campus Praia Vermelha, Niterói – RJ, 24210-340, Brazil
  • 6Postgraduate Program in Geography, Postgraduate Program in Geosciences (Geochemistry), Federal Fluminense University, Niterói – RJ, 24220-900, Brazil
  • 7Department of Environmental Changes, Linköping University, 581 83 Linköping, Sweden

Abstract. The relationship between the partial pressure of carbon dioxide (pCO2) and dissolved organic carbon (DOC) concentration in Brazilian lakes, encompassing 225 samples across a wide latitudinal range in the tropics, was tested. Unlike the positive relationship reported for lake waters, which was largely based on temperate lakes, we found no significant relationship for low-latitude lakes (<33°), despite very broad ranges in both pCO2 and DOC levels. These results suggest substantial differences in the carbon cycling of low-latitude lakes, which must be considered when upscaling limnetic carbon cycling to global scales.

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Unlike the positive relationship reported before between partial pression of carbon dioxide and dissolved organic carbon for lake waters, we found no significant relationship in our low-latitude lakes, despite very broad ranges in both variables. The strength of this relationship declines with increasing water temperature, suggesting substantial differences in carbon cycling in warm lakes, which must be considered when upscaling limnetic carbon cycling to global scales.
Unlike the positive relationship reported before between partial pression of carbon dioxide and...
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