Contribution of Anthropogenic and Natural Emissions to Global CH4 Balances by Utilizing δ13C-CH4 Observations in CarbonTracker Data Assimilation System (CTDAS)

Vilma Eveliina Kangasaho1, Aki Tsuruta1, Tuula Aalto1, Leif Bjarne Backman1, Sander Houweling2, Maarten C Krol2,3, Wouter Peters3,4, Ingrid Theodora van der Laan-Luijkx3,5, Sebastian Lienert6, Fortunat Joos6, Edward J Dlugokencky7, Sylvia Michael8 and James W C White8, (1)Finnish Meteorological Institute, Helsinki, Finland, (2)Netherlands Institute for Space Research, Utrecht, Netherlands, (3)Wageningen University and Research Center, Department of Meteorology and Air Quality, Wageningen, Netherlands, (4)Centre for Isotope Research, Groningen, Netherlands, (5)Institute for Marine and Atmospheric Research Utrecht, Utrecht, Netherlands, (6)University of Bern, Climate and Environmental Physics, Bern, Switzerland, (7)NOAA/ESRL Global Monitoring Division, Boulder, CO, United States, (8)Institute of Arctic and Alpine Research, Geological Sciences, Boulder, CO, United States