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.
L. Pinho1,2,3, C. M. Duarte2,4, H. Marotta5,6, and A. Enrich-Prast1,7
- 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
- 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
Correspondence: L. Pinho (luana.pinho@uerj.br)
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Received: 25 Nov 2014 – Discussion started: 06 Feb 2015 – Revised: 11 Jan 2016 – Accepted: 24 Jan 2016 – Published: 15 Feb 2016
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.
