Changes in CO2 dynamics related to rainfall and water level variations in a subtropical lake
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We investigated the implications of low rainfall and reduced water level for changes in nutrients and chlorophyll-a in a subtropical lake, and how these changes affected levels and atmospheric fluxes of CO2. Based on nine consecutive years of monthly monitoring of pH, alkalinity, oxygen, and temperature, we calculated the pCO2 and CO2 flux and related these to environmental drivers. Variations in annual rainfall, with extreme low levels along 2012–2014 caused the water level to decrease up to 1 m. Low water levels were associated with higher concentrations of chlorophyll-a and organic carbon as well as reduced water transparency. Under these conditions, pCO2 increased and the lake was predominantly a source of CO2 to the atmosphere. Applying a generalized linear model, we found that water temperature, water column stability, and water level were linked to pCO2. The influences of predicted regional changes in rainfall associated with low water levels will according to our model further deteriorate the water quality and enhance CO2 emissions from the lake to the atmosphere.
KeywordsRainfall Monitoring, climate changes Water quality Peri Lake
We are grateful to staff from Laboratory of Freshwater Ecology from Federal University of Santa Catarina (UFSC, www.limnos.ufsc.br) for collaborative efforts related to the samplings. We thank the ICEA (Instituto de Controle do Espaço Aéreo) and CASAN (Companhia Catarinense de Água e Esgoto) for providing rainfall and water level data, respectively. We thank the FLORAM (Fundação Municipal do Meio Ambiente de Florianópolis), LAPAD – UFSC (Laboratório de Biologia e Cultivo de Peixes de Água Doce) and the PPGECO – UFSC (Programa de pós-graduação em Ecologia) for providing assistance for field and laboratory equipments. We also would like to thank Eduardo Giehl for the help with statistical analyses, Izidro Souza-Filho for helping to improve the figure 1 and three anonymous reviewers who provided insights on an earlier version of the manuscript. This study was funded by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and the first author was supported by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) and COCLake Project (No. 88881.030499/2013-01).
- Abril, G., S. Bouillon, F. Darchambeau, C. R. Teodoru, T. R. Marwick, F. Tamooh, F. O. Omengo, N. Geeraert, L. Deirmendjian, P. Polsenaere & A. V. Borges, 2015. Large overestimation of pCO2 calculated from pH and alkalinity in acidic, organic-rich freshwaters. Biogeosciences 12: 67–78.CrossRefGoogle Scholar
- Almeida, R. M., G. N. Nóbrega, P. C. Junger, A. V. Figueiredo, A. S. Andrade, C. G. B. Moura, D. Tonetta, E. S. Oliveira Jr., F. Araújo, F. Rust, J. M. Piñeiro-Guerra, J. R. Mendonça Jr., L. R. Medeiros, L. P. Silva, M. Miranda, M. R. A. Costa, M. L. Melo, R. Nobre, T. Benevides, F. Roland, J. de Klein, N. O. Barros, R. Mendonça, V. Becker, V. Huszar & S. Kosten, 2016. High primary production contrasts with intense carbon emission in a eutrophic tropical reservoir. Frontiers in Microbiology. doi: 10.3389/fmicb.2016.00717.Google Scholar
- Cole, J. J., Y. T. Prairie, N. F. Caraco, W. H. McDowell, L. J. Tranvik, R. G. Striegl, C. M. Duarte, P. Kortelainen, J. A. Downing, J. J. Middelburg & J. Melack, 2007. Plumbing the global carbon cycle: integrating inland waters into the terrestrial carbon budget. Ecosystems 10: 171–184.CrossRefGoogle Scholar
- Crawley, M. J., 2012. The R Book. Wiley, Hoboken, NJ: 1076 pp.Google Scholar
- Dlugokencky, E. & P. Tans. 2016. National Oceanic and Atmospheric Administration – NOAA/ESRL. http://www.esrl.noaa.gov/gmd/ccgg/trends/.
- Dugan, H. A., R. I. Woolway, A. B. Santoso, J. R. Corman, A. Jaimes, E. R. Nodine, V. P. Patil, J. A. Zwart, J. A. Brentrup, A. L. Hetherington, S. K. Oliver, J. S. Read, K. M. Winters, P. C. Hanson, E. K. Read, L. A. Winslow & K. C. Weathers, 2016. Consequences of gas flux model choice on the interpretation of metabolic balance across 15 lakes. Inland Waters 6: 581–592.Google Scholar
- Eyto, E., E. Jennings, E. Ryder, K. Sparber, M. Dillane, C. Dalton & R. Poole, 2016. Response of a humic lake ecosystem to an extreme precipitation event: physical, chemical, and biological implications. Inland Waters 6: 483–498.Google Scholar
- Gómez-Gener, L., D. von Schiller, R. Marcé, M. Arroita, J. P. Casas-Ruiz, P. A. Staehr, V. Acuña, S. Sabater & B. Obrador, 2016. Low contribution of internal metabolism to CO2 emissions along lotic and lentic environments of a Mediterranean fluvial network. Journal of Geophysical Research Biogeosciences. doi: 10.1002/2016JG003549.Google Scholar
- Hyndman, R. J., 2016. forecast: Forecasting Functions for Time Series and Linear Models. R Package Version 7.1. http://github.com/robjhyndman/forecast.
- IPCC, 2014. Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. In Pachauri, R. K. & L. A. Meyer (eds), Core Writing Team. IPCC, Geneva.Google Scholar
- Jeppesen, E., S. Brucet, L. Naselli-Flores, E. Papastergiadou, K. Stefanidis, T. Nõges, P. Nõges, J. L. Attayde, T. Zohary, J. Coppens, T. Bucak, R. F. Menezes, F. R. S. Freitas, M. Kernan, M. Søndergaard & M. Beklioğlu, 2015. Ecological impacts of global warming and water abstraction on lakes and reservoirs due to changes in water level and related changes in salinity. Hydrobiologia 750: 201–227.CrossRefGoogle Scholar
- Jonsson, A., J. Aberg, A. Lindroth & M. Jansson, 2008. Gas transfer rate and CO2 flux between an unproductive lake and the atmosphere in northern Sweden. Journal of Geophysical Research 113: G04006.Google Scholar
- Kortelainen, P., J. T. Huttunen, T. Väisänen, T. Mattsson, P. Karjalainen & J. Martikainen, 2000. CH4, CO2 and N2O supersaturation in 12 Finnish lakes before the ice melt. Verhandlungen der Internationale Vereinigung für Theoretische und Angewandte Limnologie 27: 1410–1414.Google Scholar
- Pacheco, F. S., M. C. S. Soares, A. T. Assireu, M. P. Curtarelli, F. Roland, G. Abril, J. L. Stech, P. C. Alvalá & J. P. Ometto, 2015. The effects of river inflow and retention time on the spatial heterogeneity of chlorophyll and water–air CO2 fluxes in a tropical hydropower reservoir. Biogeosciences 12: 147–162.CrossRefGoogle Scholar
- Peixoto, R. B., H. Marotta & A. Enrich-Prast, 2013. Experimental evidence of nitrogen control on pCO2 in phosphorus enriched humic and clear coastal lagoon waters. Frontiers in Microbiology, Aquatic Microbiology 4: 1–6.Google Scholar
- R Development Core Team, 2014. R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna. http://www.R-project.org/.
- Schiemer, F. & K. T. Boland, 1996. Perspectives in Tropical Limnology. Academic Publishing, Amsterdam.Google Scholar
- Snoeyink, V. L. & D. Jenkins, 1980. Water Chemistry. Wiley, New York.Google Scholar
- Stumm, W. & J. J. Morgan, 1996. Aquatic Chemistry: Chemical Equilibria and Rates in Natural Waters. Wiley-Interscience, New York.Google Scholar
- Tsai, J. W., T. K. Kratz, J. A. Rusak, W. Y. Shih, W. C. Liu, S. L. Tang & C. Y. Chiu, 2016. Absence of winter and spring monsoon changes water level and rapidly shifts metabolism in a subtropical lake. Inland Waters 6: 436–448.Google Scholar