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GLOBAL BIOGEOCHEMICAL CYCLES,
VOL. 22,
GB3009,
15 PP., 2008
doi:10.1029/2007GB003050
TransCom model simulations of hourly atmospheric CO2: Experimental overview and diurnal cycle results for 2002
CSIRO Marine and Atmospheric Research, Aspendale, Victoria, Australia
NOAA Earth Systems Research Laboratory, Boulder, Colorado, USA
Department of Meteorology and Air Quality, Wageningen University and Research Center, Wageningen, Netherlands
Max-Planck-Institute for Biogeochemistry, Jena, Germany
Laboratoire des Sciences du Climat et de l'Environnement/IPSL, CEA/CNRS/UVSQ, Gif-sur-Yvette, France
Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
Lawrence Livermore National Laboratory, Livermore, California, USA
Laboratoire des Sciences du Climat et de l'Environnement/IPSL, CEA/CNRS/UVSQ, Gif-sur-Yvette, France
National Environmental Research Institute, University of Aarhus, Roskilde, Denmark
NOAA Earth Systems Research Laboratory, Boulder, Colorado, USA
Lawrence Livermore National Laboratory, Livermore, California, USA
National Environmental Research Institute, University of Aarhus, Roskilde, Denmark
Laboratoire des Sciences du Climat et de l'Environnement/IPSL, CEA/CNRS/UVSQ, Gif-sur-Yvette, France
Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA
National Environmental Research Institute, University of Aarhus, Roskilde, Denmark
Institute for Marine and Atmospheric Research, Utrecht, Netherlands
Center for Climate System Research, University of Tokyo, Tokyo, Japan
Max-Planck-Institute for Biogeochemistry, Jena, Germany
NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Privacy Networks, Fort Collins, Colorado, USA
Department of Meteorology and Air Quality, Wageningen University and Research Center, Wageningen, Netherlands
SRON, Utrecht, Netherlands
NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA
Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
Atmospheric Environment Division, Japan Meteorological Agency, Tokyo, Japan
National Institute for Environmental Studies, Tsukuba, Japan
Frontier Research Center for Global Change/JAMSTEC, Yokohama, Japan
Center for Climate System Research, University of Tokyo, Tokyo, Japan
Earth Simulator Center, JAMSTEC, Yokohama, Japan
Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
Frontier Research Center for Global Change/JAMSTEC, Yokohama, Japan
Institute for Marine and Atmospheric Research, Utrecht, Netherlands
Energy Research Centre of the Netherlands, Petten, Netherlands
Laboratoire des Sciences du Climat et de l'Environnement/IPSL, CEA/CNRS/UVSQ, Gif-sur-Yvette, France
Center for Climate System Research, University of Tokyo, Tokyo, Japan
Frontier Research Center for Global Change/JAMSTEC, Yokohama, Japan
ECMWF, Reading, UK
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
Frontier Research Center for Global Change/JAMSTEC, Yokohama, Japan
Laboratoire des Sciences du Climat et de l'Environnement/IPSL, CEA/CNRS/UVSQ, Gif-sur-Yvette, France
Energy Research Centre of the Netherlands, Petten, Netherlands
Science Systems and Applications Incorporated, Lanham, Maryland, USA
A forward atmospheric transport modeling experiment has been coordinated by the TransCom group to investigate synoptic and diurnal variations in CO2. Model simulations were run for biospheric, fossil, and air-sea exchange of CO2 and for SF6 and radon for 2000–2003. Twenty-five models or model variants participated in the comparison. Hourly concentration time series were submitted for 280 sites along with vertical profiles, fluxes, and meteorological variables at 100 sites. The submitted results have been analyzed for diurnal variations and are compared with observed CO2 in 2002. Mean summer diurnal cycles vary widely in amplitude across models. The choice of sampling location and model level account for part of the spread suggesting that representation errors in these types of models are potentially large. Despite the model spread, most models simulate the relative variation in diurnal amplitude between sites reasonably well. The modeled diurnal amplitude only shows a weak relationship with vertical resolution across models; differences in near-surface transport simulation appear to play a major role. Examples are also presented where there is evidence that the models show useful skill in simulating seasonal and synoptic changes in diurnal amplitude.
Received 1 July 2007; accepted 26 March 2008; published 1 August 2008.
Citation: (2008), TransCom model simulations of hourly atmospheric CO2: Experimental overview and diurnal cycle results for 2002, Global Biogeochem. Cycles, 22, GB3009, doi:10.1029/2007GB003050.
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