OPENAIRE OpenAire Sygma Bielefeld Academic Search Engine (BASE) HAL-INSU HAL - Université de Lille Publikationer från Uppsala Universitet Crossref Microsoft Academic Graph Europe PubMed Central European Union Open Data Portal https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.13902 https://doi.org/10.1111/gcb.13902 Global Change Biology Open Access 2017-09-11 2023-11-27 Abstract<p>Lakes (including reservoirs) are an important component of the global carbon (C) cycle, as acknowledged by the fifth assessment report of the IPCC. In the context of lakes, the boreal region is disproportionately important contributing to 27% of the worldwide lake area, despite representing just 14% of global land surface area. In this study, we used a statistical approach to derive a prediction equationￂﾠfor the partial pressure of CO2 (pCO2) in lakes as a function of lake area, terrestrial net primary productivity (NPP), and precipitation (r2ￂﾠ=ￂﾠ.56), and to create the first high￢ﾀﾐresolution, circumboreal map (0.5ￂﾰ) of lake pCO2. The map ofￂﾠpCO2 was combined with lake area from the recently published GLOWABO database and three different estimates of the gas transfer velocity k to produce a resulting map of CO2 evasion (FCO2). For the boreal region, we estimate an average, lake area weighted, pCO2 of 966 (678￢ﾀﾓ1,325) ￎﾼatm and a totalￂﾠFCO2 of 189 (74￢ﾀﾓ347) TgￂﾠCￂﾠyear￢ﾈﾒ1, and evaluate the corresponding uncertainties based on Monte Carlo simulation. Our estimate of FCO2 is approximately twofold greater than previous estimates, as a result of methodological and data source differences. We use our results along with published estimates of the other C fluxes through inland waters to derive a C budget for the boreal region, and find that FCO2 from lakes is the most significant flux of the land￢ﾀﾐocean aquatic continuum, and of a similar magnitude as emissions from forest fires. Using the model and applying it to spatially resolved projections of terrestrial NPP and precipitation while keeping everything else constant, we predict a 107% increase in boreal lake FCO2 under emission scenario RCP8.5 by 2100. Our projections are largely driven by increases in terrestrial NPP over the same period, showing the very close connection between the terrestrial and aquatic C cycle.</p 0106 biological sciences Precipitation precipitation 01 natural sciences Lake Environnement et pollution carbon budget Carbon budget Geovetenskap och relaterad miljövetenskap terrestrial NPP boreal Climate change Boreal lake Ecosystem Future projections 0105 earth and related environmental sciences Ecologie Arctic Regions Terrestrial NPP Carbon Dioxide Models, Theoretical 15. Life on land 6. Clean water Carbon Lakes climate change 13. Climate action [SDU.STU] Sciences of the Universe [physics]/Earth Sciences contrôle de la pollution CO2 Technologie de l'environnement Earth and Related Environmental Sciences future projections Forecasting Pierre Regnier, Adam Hastie, Sebastian Sobek, Charles Verpoorter, Charles Verpoorter, Ronny Lauerwald, Ronny Lauerwald, Gesa A. Weyhenmeyer, 2017-10-16 journalpaper Abstract<p>Lakes (including reservoirs) are an important component of the global carbon (C) cycle, as acknowledged by the fifth assessment report of the IPCC. In the context of lakes, the boreal region is disproportionately important contributing to 27% of the worldwide lake area, despite representing just 14% of global land surface area. In this study, we used a statistical approach to derive a prediction equationￂﾠfor the partial pressure of CO2 (pCO2) in lakes as a function of lake area, terrestrial net primary productivity (NPP), and precipitation (r2ￂﾠ=ￂﾠ.56), and to create the first high￢ﾀﾐresolution, circumboreal map (0.5ￂﾰ) of lake pCO2. The map ofￂﾠpCO2 was combined with lake area from the recently published GLOWABO database and three different estimates of the gas transfer velocity k to produce a resulting map of CO2 evasion (FCO2). For the boreal region, we estimate an average, lake area weighted, pCO2 of 966 (678￢ﾀﾓ1,325) ￎﾼatm and a totalￂﾠFCO2 of 189 (74￢ﾀﾓ347) TgￂﾠCￂﾠyear￢ﾈﾒ1, and evaluate the corresponding uncertainties based on Monte Carlo simulation. Our estimate of FCO2 is approximately twofold greater than previous estimates, as a result of methodological and data source differences. We use our results along with published estimates of the other C fluxes through inland waters to derive a C budget for the boreal region, and find that FCO2 from lakes is the most significant flux of the land￢ﾀﾐocean aquatic continuum, and of a similar magnitude as emissions from forest fires. Using the model and applying it to spatially resolved projections of terrestrial NPP and precipitation while keeping everything else constant, we predict a 107% increase in boreal lake FCO2 under emission scenario RCP8.5 by 2100. Our projections are largely driven by increases in terrestrial NPP over the same period, showing the very close connection between the terrestrial and aquatic C cycle.</p CO2 evasion from boreal lakes: Revised estimate, drivers of spatial variability, and future projections 10.1111/gcb.13902 703813