TY - JOUR A1 - Chatterjee, A. A1 - Michalak, A. M. T1 - Technical Note: Comparison of ensemble Kalman filter and variational approaches for CO2 data assimilation JO - Atmos. Chem. Phys. J1 - ACP VL - 13 IS - 23 SP - 11643 EP - 11660 Y1 - 2013/12/03 PB - Copernicus Publications SN - 1680-7324 UR - https://acp.copernicus.org/articles/13/11643/2013/ L1 - https://acp.copernicus.org/articles/13/11643/2013/acp-13-11643-2013.pdf DO - 10.5194/acp-13-11643-2013 ER -