Temperature-dependence of the relationship between pCO2 and dissolved organic carbon in lakes
byPinho, L., C. M. Duarte, H. Marotta, A. Enrich-Prast
Pinho, L., C. M. Duarte, H. Marotta, and A. Enrich-Prast. 2016. Temperature-dependence of the relationship between pCO2 and dissolved organic carbon in lakes. Biogeoscience 13: 865–871. doi:10.5194/bg-13-865-2016
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.