author = "Pacheco, Felipe Siqueira and Soares, M. C. S. and Assireu, A. T. 
                         and Curtarelli, Marcelo Pedroso and Roland, F. and Abril, G. and 
                         Stech, Jos{\'e} Luiz and Alval{\'a}, Plinio Carlos and Ometto, 
                         Jean Pierre Henry Balbaud",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal de Juiz de Fora (UFJF)} and {Universidade 
                         Federal de Itajub{\'a} (UNIFEI)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade Federal de Juiz de 
                         Fora (UFJF)} and {Laboratoire Environnements et 
                         Pal{\'e}oenvironnements Oc{\'e}aniques et Continentaux (EPOC)} 
                         and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "The effects of river inflow and retention time on the spatial 
                         heterogeneity of chlorophyll and water–air CO2 fluxes in a 
                         tropical hydropower reservoir",
              journal = "Biogeosciences",
                 year = "2015",
               volume = "12",
                pages = "147--162",
             abstract = "Abundant research has been devoted to understanding the complexity 
                         of the biogeochemical and physical processes that are responsible 
                         for greenhouse gas (GHG) emissions from hydropower reservoirs. 
                         These systems may have spatially complex and heterogeneous GHG 
                         emissions due to flooded biomass, river inflows, primary 
                         production and dam operation. In this study, we investigated the 
                         relationships between the waterair CO2 fluxes and the 
                         phytoplanktonic biomass in the Funil Reservoir, which is an old, 
                         stratified tropical reservoir that exhibits intense phytoplankton 
                         blooms and a low partial pressure of CO2 (pCO2). Our results 
                         indicated that the seasonal and spatial variability of chlorophyll 
                         concentrations (Chl) and pCO2 in the Funil Reservoir are related 
                         more to changes in the river inflow over the year than to 
                         environmental factors such as air temperature and solar radiation. 
                         Field data and hydro\-dynamic simulations revealed that river 
                         inflow contributes to increased heterogeneity during the dry 
                         season due to variations in the reservoir retention time and river 
                         temperature. Contradictory conclusions could be drawn if only 
                         temporal data collected near the dam were considered without 
                         spatial data to represent CO2 fluxes throughout the reservoir. 
                         During periods of high retention, the average CO2 fluxes were 10.3 
                         mmol m\−2 d\−1 based on temporal data near the dam 
                         versus \−7.2 mmol m\−2 d\−1 with spatial data 
                         from along the reservoir surface. In this case, the use of solely 
                         temporal data to calculate CO2 fluxes results in the reservoir 
                         acting as a CO2 source rather than a sink. This finding suggests 
                         that the lack of spatial data in reservoir C budget calculations 
                         can affect regional and global estimates. Our results support the 
                         idea that the Funil Reservoir is a dynamic system where the 
                         hydrodynamics represented by changes in the river inflow and 
                         retention time are potentially a more important force driving both 
                         the Chl and pCO2 spatial variability than the in-system ecological 
                  doi = "10.5194/bg-12-147-2015",
                  url = "http://dx.doi.org/10.5194/bg-12-147-2015",
                 issn = "1726-4170",
             language = "en",
           targetfile = "Pacheco_effects.pdf",
        urlaccessdate = "24 nov. 2020"