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Global 3-D Simulations of the Triple Oxygen Isotope Signature Δ17O in Atmospheric CO2

Koren, Gerbrand; Schneider, Linda 1; Velde, Ivar R. van der; Schaik, Erik van; Gromov, Sergey S.; Adnew, Getachew A.; Mrozek Martino, Dorota J.; Hofmann, Magdalena E. G.; Liang, Mao-Chang; Mahata, Sasadhar; Bergamaschi, Peter; Laan-Luijkx, Ingrid T. van der; Krol, Maarten C.; Röckmann, Thomas; Peters, Wouter
1 Institut für Meteorologie und Klimaforschung Troposphärenforschung (IMKTRO), Karlsruher Institut für Technologie (KIT)


The triple oxygen isotope signature Δ¹⁷O in atmospheric CO₂, also known as its “¹⁷O excess,” has been proposed as a tracer for gross primary production (the gross uptake of CO₂ by vegetation through photosynthesis). We present the first global 3-D model simulations for Δ¹⁷O in atmospheric CO₂ together with a detailed model description and sensitivity analyses. In our 3-D model framework we include the stratospheric source of Δ¹⁷O in CO₂ and the surface sinks from vegetation, soils, ocean, biomass burning, and fossil fuel combustion. The effect of oxidation of atmospheric CO on Δ¹⁷O in CO2 is also included in our model. We estimate that the global mean Δ¹⁷O (defined as Δ¹⁷O = ln(𝛿 ¹⁷O + 1) − 𝜆RL · ln(𝛿 ¹⁸O + 1) with 𝜆RL = 0.5229) of CO₂ in the lowest 500 m of the atmosphere is 39.6 per meg, which is ∼20 per meg lower than estimates from existing box models. We compare our model results with a measured stratospheric Δ¹⁷O in CO₂ profile from Sodankylä (Finland), which shows good agreement. In addition, we compare our model results with tropospheric measurements of Δ¹⁷O in CO₂ from Göttingen (Germany) and Taipei (Taiwan), which shows some agreement but we also find substantial discrepancies that are subsequently discussed. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000099372
Veröffentlicht am 28.10.2019
DOI: 10.1029/2019JD030387
Zitationen: 22
Zitationen: 28
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Troposphärenforschung (IMKTRO)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2169-897X
KITopen-ID: 1000099372
HGF-Programm 12.01.01 (POF III, LK 01) Clouds in a pertubed atmosphere
Erschienen in Journal of geophysical research / D
Verlag John Wiley and Sons
Band 124
Heft 15
Seiten 8808-8836
Vorab online veröffentlicht am 19.06.2019
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