HR: 16:15h
AN: B34B-02    [Abstracts]
TI: Observed Relationships Between Large-Scale Atmospheric Variability and the Carbon Cycle
AU: * Hawes, A K
EM: amy@atmos.colostate.edu
AF: Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523 United States
AU: Thompson, D W
EM: davet@atmos.colostate.edu
AF: Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523 United States
AB: The impact of increasing atmospheric carbon dioxide on global climate change has been studied extensively, but the effect of large-scale patterns of atmospheric variability on biogeochemical cycling has received substantially less attention. In this study, we examine the impact of two such patterns of atmospheric variability, the so-called Northern and Southern Annular Modes, on monthly and daily mean concentrations of atmospheric carbon dioxide at stations throughout the globe. The annular modes are thought to have important impacts on the fluxes of CO2 since both patterns exert substantial influences on surface climate throughout their respective hemispheres, and both patterns have exhibited trends over the past few decades. Preliminary results suggest both annular modes are, in fact, coupled to variations in atmospheric CO2 in a manner consistent with their climate impacts, but that the amplitudes of the relationships are generally weak. The findings are compared with results derived from surface flux estimates from the Atmospheric Tracer Transport Model Intercomparison Project (TransCom).
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
SC: Biogeosciences [B]
MN: Fall Meeting 2005