Title: Global 3‐D Simulations of the Triple Oxygen Isotope Signature Δ17O in Atmospheric CO2
Authors: KOREN GERBRANDSCHNEIDER LINDAVAN DER VELDE IVAR R.VAN SCHAIK ERIKGROMOV SERGEY S.ADNEW GETACHEW A.MROZEK DOROTA J.HOFMANN MAGDALENA E.G.LIANG MAO-CHANGMAHATA SASADHARBERGAMASCHI PETERVAN DER LAAN-LUIJKX INGRID T.KROL M.ROECKMANN THOMASPETERS W.
Citation: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES vol. 124 no. 15 p. 8808-8836
Publisher: AMER GEOPHYSICAL UNION
Publication Year: 2019
JRC N°: JRC110751
ISSN: 2169-897X (online)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC110751
DOI: 10.1029/2019JD030387
Type: Articles in periodicals and books
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 urn:x-wiley:jgrd:media:jgrd55562:jgrd55562-math-0001 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. Finally, we show model results for Zotino (Russia), Mauna Loa (United States), Manaus (Brazil), and South Pole, which we propose as possible locations for future measurements of Δ17O in tropospheric CO2 that can help to further increase our understanding of the global budget of Δ17O in atmospheric CO2.
JRC Directorate:Energy, Transport and Climate

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