TransCom 3 CO2 inversion intercomparison

1. Annual mean control results and sensitivity to transport and prior flux information

Kevin Gurney, Rachel M. Law, A. Scott Denning, Peter J. Rayner, David Baker, Philippe Bousquet, Lori Bruhwiler, Yu Han Chen, Philippe Ciais, Songmiao Fan, Inez Y. Fung, Manuel Gloor, Martin Heimann, Kaz Higuchi, Jasmin John, Eva Kowalczyk, Takashi Maki, Shamil Maksyutov, Philippe Peylin, Michael Prather & 5 others Bernard C. Pak, Jorge Sarmiento, Shoichi Taguchi, Taro Takahashi, Chiu Wai Yuen

Research output: Contribution to journalArticle

202 Citations (Scopus)

Abstract

Spatial and temporal variations of atmospheric CO2 concentrations contain information about surface sources and sinks, which can be quantitatively interpreted through tracer transport inversion. Previous CO2 inversion calculations obtained differing results due to different data, methods and transport models used. To isolate the sources of uncertainty, we have conducted a set of annual mean inversion experiments in which 17 different transport models or model variants were used to calculate regional carbon sources and sinks from the same data with a standardized method. Simulated transport is a significant source of uncertainty in these calculations, particularly in the response to prescribed "background" fluxes due to fossil fuel combustion, a balanced terrestrial biosphere, and air-sea gas exchange. Individual model-estimated fluxes are often a direct reflection of their response to these background fluxes. Models that generate strong surface maxima near background exchange locations tend to require larger uptake near those locations. Models with weak surface maxima tend to have less uptake in those same regions but may infer small sources downwind. In some cases, individual model flux estimates cannot be analyzed through simple relationships to background flux responses but are likely due to local transport differences or particular responses at individual CO2 observing locations. The response to the background biosphere exchange generates the greatest variation in the estimated fluxes, particularly over land in the Northern Hemisphere. More observational data in the tropical regions may help in both lowering the uncertain tropical land flux uncertainties and constraining the northern land estimates because of compensation between these two broad regions in the inversion. More optimistically, examination of the model-mean retrieved fluxes indicates a general insensitivity to the prior fluxes and the prior flux uncertainties. Less uptake in the Southern Ocean than implied by oceanographic observations, and an evenly distributed northern land sink, remain in spite of changes in this aspect of the inversion setup.

Original languageEnglish (US)
Pages (from-to)555-579
Number of pages25
JournalTellus, Series B: Chemical and Physical Meteorology
Volume55
Issue number2
DOIs
StatePublished - Apr 2003
Externally publishedYes

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biosphere
inversion
tropical region
gas exchange
fossil fuel
Northern Hemisphere
temporal variation
spatial variation
combustion
tracer
land
carbon
air
ocean
experiment
method
calculation
sea

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

TransCom 3 CO2 inversion intercomparison : 1. Annual mean control results and sensitivity to transport and prior flux information. / Gurney, Kevin; Law, Rachel M.; Denning, A. Scott; Rayner, Peter J.; Baker, David; Bousquet, Philippe; Bruhwiler, Lori; Chen, Yu Han; Ciais, Philippe; Fan, Songmiao; Fung, Inez Y.; Gloor, Manuel; Heimann, Martin; Higuchi, Kaz; John, Jasmin; Kowalczyk, Eva; Maki, Takashi; Maksyutov, Shamil; Peylin, Philippe; Prather, Michael; Pak, Bernard C.; Sarmiento, Jorge; Taguchi, Shoichi; Takahashi, Taro; Yuen, Chiu Wai.

In: Tellus, Series B: Chemical and Physical Meteorology, Vol. 55, No. 2, 04.2003, p. 555-579.

Research output: Contribution to journalArticle

Gurney, K, Law, RM, Denning, AS, Rayner, PJ, Baker, D, Bousquet, P, Bruhwiler, L, Chen, YH, Ciais, P, Fan, S, Fung, IY, Gloor, M, Heimann, M, Higuchi, K, John, J, Kowalczyk, E, Maki, T, Maksyutov, S, Peylin, P, Prather, M, Pak, BC, Sarmiento, J, Taguchi, S, Takahashi, T & Yuen, CW 2003, 'TransCom 3 CO2 inversion intercomparison: 1. Annual mean control results and sensitivity to transport and prior flux information', Tellus, Series B: Chemical and Physical Meteorology, vol. 55, no. 2, pp. 555-579. https://doi.org/10.1034/j.1600-0889.2003.00049.x
Gurney, Kevin ; Law, Rachel M. ; Denning, A. Scott ; Rayner, Peter J. ; Baker, David ; Bousquet, Philippe ; Bruhwiler, Lori ; Chen, Yu Han ; Ciais, Philippe ; Fan, Songmiao ; Fung, Inez Y. ; Gloor, Manuel ; Heimann, Martin ; Higuchi, Kaz ; John, Jasmin ; Kowalczyk, Eva ; Maki, Takashi ; Maksyutov, Shamil ; Peylin, Philippe ; Prather, Michael ; Pak, Bernard C. ; Sarmiento, Jorge ; Taguchi, Shoichi ; Takahashi, Taro ; Yuen, Chiu Wai. / TransCom 3 CO2 inversion intercomparison : 1. Annual mean control results and sensitivity to transport and prior flux information. In: Tellus, Series B: Chemical and Physical Meteorology. 2003 ; Vol. 55, No. 2. pp. 555-579.
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AU - Baker, David

AU - Bousquet, Philippe

AU - Bruhwiler, Lori

AU - Chen, Yu Han

AU - Ciais, Philippe

AU - Fan, Songmiao

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AU - Heimann, Martin

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AU - Maki, Takashi

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AU - Peylin, Philippe

AU - Prather, Michael

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