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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)

Abstract:

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

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
Nachgewiesen in Web of Science
OpenAlex
Scopus
Dimensions
Globale Ziele für nachhaltige Entwicklung Ziel 14 – Leben unter Wasser

Verlagsausgabe §
DOI: 10.5445/IR/1000099372
Veröffentlicht am 28.10.2019
Originalveröffentlichung
DOI: 10.1029/2019JD030387
Scopus
Zitationen: 26
Web of Science
Zitationen: 28
Dimensions
Zitationen: 33
Seitenaufrufe: 259
seit 30.10.2019
Downloads: 163
seit 02.11.2019
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