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.
Temperature dependence of the relationship between pCO2 and dissolved organic carbon in lakes 2016, 13 (3):865 Biogeosciences
This research is a contribution to projects from Brazilian research agencies (FAPERJ, CAPES and CNPq).
L. Pinho was supported by PhD scholarships from CAPES (period in Brazil) and FAPERJ (period in Spain). A. Enrich-Prast received postdoctoral and other CAPES and CNPq fellowships during studies at Linkoping University. H. Marotta was supported by a research fellowship from FAPERJ (Programa Jovem Cientista do Nosso Estado), and a research grant from CNPq.