Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 10 2 2010 10.5194/acp-10-453-2010 http://www.atmos-chem-phys.net/10/453/2010/ http://www.atmos-chem-phys.net/10/453/2010/acp-10-453-2010.html http://www.atmos-chem-phys.net/10/453/2010/acp-10-453-2010.pdf 453 462 2010-01-19 Increasing synoptic scale variability in atmospheric CO₂ at Hateruma Island associated with increasing East-Asian emissions Y. Tohjima tohjima@nies.go.jp H. Mukai S. Hashimoto P. K. Patra Atmospheric Environment Division, National Institute for Environmental Studies, Tsukuba, Japan Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Japan Research Institute for Global Change, JAMSTEC, Yokohama, Japan In-situ observations of atmospheric CO₂ and CH₄ at Hateruma Island (24.05° N, 123.80° E, 47 m a.s.l), Japan shows large synoptic scale variations during a 6-month period from November to April, when the sampled air is predominantly of continental origin due to the Asian winter monsoon. Synoptic scale variations are extracted from the daily averaged values for the years between 1996 and 2007, along with the annual standard deviations (σ_CO₂ and σ_CH₄ for CO₂ and CH₄, respectively) for the relevant 6-month period. During this 6-month period the absolute mixing ratios of CO₂ and CH₄ at Hateruma are also elevated compared to those at two sites in the central North Pacific Ocean. 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