Reconciling top-down and bottom-up estimates of CO2 fluxes to understand increased seasonal exchange in Northern ecosystems

Ana Bastos1, Philippe Ciais2, Dan Zhu3, Fabienne Maignan3, Xuhui Wang4, Frederic Chevallier5 and Ashley Ballantyne6, (1)Leipzig University, Institute for Earth System Science and Remote Sensing, Leipzig, Germany, (2)LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette, France, (3)CEA Saclay DSM / LSCE, Gif sur Yvette, France, (4)CNRS, Paris Cedex 16, France, (5)LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette Cedex, France, (6)University of Colorado at Boulder, Boulder, CO, United States