Impact of Fraserdale CO 2 observations on annual flux inversion of the North American boreal region
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Impact of Fraserdale CO 2 observations on annual flux inversion of the North American boreal region

  • Author(s): Yuen, C.-W.
  • Higuchi, K.
  • Baker, D.
  • Bousquet, P
  • Bruhwiler, L.
  • Chen, Y.-H.
  • Ciais, P.
  • Denning, A. S.
  • Fan, S.
  • Fung, L.
  • Gloor, M.
  • Gurney, K. R.
  • Heimann, M.
  • John, J.
  • Law, R. M.
  • Maki, T,
  • Maksyutov, S.
  • Pak, B.
  • Peylin, P.
  • Prather, M.
  • Rayner, P.
  • Sarmiento, J,
  • Taguchi, S.
  • Takahashi, T.
  • et al.
Abstract

In TransCom-3 (Level 1), atmospheric CO2 measurements from 76 monitoring stations for the period 1992–1996 and 16 atmospheric transport models were used to constrain annual mean CO2 fluxes over 11 land and 11 ocean regions. The tower measurements of atmospheric CO2 from Fraserdale, a continental site in northern Ontario, Canada are now available and processed for use in the TransCom-3 inverse modelling framework. In this short study, we show that by including this set of continental CO2 data, the estimated flux for the North American boreal region becomes nearly zero, a reduction of about 0.26 Pg C yr−1 from the previous estimate. The uncertainty of the estimated flux for this region is also reduced by ∼30%. All transport models show negative changes for boreal North America, with the strongest responses (∼−0.5 Pg C yr−1) shown by NIRE, NIES, CSU and SKYHI. Furthermore, models showing a strong response in boreal North America tend to show strong sensitivity in middle- and high-latitude Asian regions.

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