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TransCom model simulations of hourly atmospheric CO2 : experimental overview and diurnal cycle results for 2002

Law, R. M.; Peters, W.; Roedenbeck, C.; Aulagnier, C.; Baker, I.; Bergmann, D. J.; Bousquet, P.; Brandt, J.; Bruhwiler, L. and Cameron-Smith, P. J., et al. (2008) In Global Biogeochemical Cycles 22(3). p.1-15
Abstract
[1] 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... (More)
[1] 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. (Less)
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type
Contribution to journal
publication status
published
subject
in
Global Biogeochemical Cycles
volume
22
issue
3
pages
1 - 15
publisher
American Geophysical Union
external identifiers
  • wos:000258150200001
  • other:Article number GB3009
  • scopus:65549092583
ISSN
0886-6236
DOI
10.1029/2007GB003050
language
English
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no
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297e6671-7fb0-4360-b36e-2d0fde581cfa (old id 4623971)
date added to LUP
2014-10-14 15:01:10
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2017-08-13 04:07:27
@article{297e6671-7fb0-4360-b36e-2d0fde581cfa,
  abstract     = {[1] 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.},
  author       = {Law, R. M. and Peters, W. and Roedenbeck, C. and Aulagnier, C. and Baker, I. and Bergmann, D. J. and Bousquet, P. and Brandt, J. and Bruhwiler, L. and Cameron-Smith, P. J. and Christensen, J. H. and Delage, F. and Denning, A. S. and Fan, S. and Geels, C. and Houweling, S. and Imasu, R. and Karstens, Ute and Kawa, S. R. and Kleist, J. and Krol, M. C. and Lin, S. -J. and Lokupitiya, R. and Maki, T. and Maksyutov, S. and Niwa, Y. and Onishi, R. and Parazoo, N. and Patra, P. K. and Pieterse, G. and Rivier, L. and Satoh, M. and Serrar, S. and Taguchi, S. and Takigawa, M. and Vautard, R. and Vermeulen, Alex and Zhu, Z.},
  issn         = {0886-6236},
  language     = {eng},
  number       = {3},
  pages        = {1--15},
  publisher    = {American Geophysical Union},
  series       = {Global Biogeochemical Cycles},
  title        = {TransCom model simulations of hourly atmospheric CO2 : experimental overview and diurnal cycle results for 2002},
  url          = {http://dx.doi.org/10.1029/2007GB003050},
  volume       = {22},
  year         = {2008},
}