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Portrait of Alex Vermeulen

Alex Vermeulen

Manager

Portrait of Alex Vermeulen

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

Author

  • R. M. Law
  • W. Peters
  • C. Roedenbeck
  • C. Aulagnier
  • I. Baker
  • D. J. Bergmann
  • P. Bousquet
  • J. Brandt
  • L. Bruhwiler
  • P. J. Cameron-Smith
  • J. H. Christensen
  • F. Delage
  • A. S. Denning
  • S. Fan
  • C. Geels
  • S. Houweling
  • R. Imasu
  • Ute Karstens
  • S. R. Kawa
  • J. Kleist
  • M. C. Krol
  • S. -J. Lin
  • R. Lokupitiya
  • T. Maki
  • S. Maksyutov
  • Y. Niwa
  • R. Onishi
  • N. Parazoo
  • P. K. Patra
  • G. Pieterse
  • L. Rivier
  • M. Satoh
  • S. Serrar
  • S. Taguchi
  • M. Takigawa
  • R. Vautard
  • Alex Vermeulen
  • Z. Zhu
Show all

Summary, in English

[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.

Publishing year

2008

Language

English

Pages

1-15

Publication/Series

Global Biogeochemical Cycles

Volume

22

Issue

3

Document type

Journal article

Publisher

American Geophysical Union (AGU)

Topic

  • Physical Geography

Status

Published

ISBN/ISSN/Other

  • ISSN: 0886-6236
  • Article number GB3009