CORDIS OpenAire Datacite Research@WUR Sygma Bielefeld Academic Search Engine (BASE) Pure Utrecht University Crossref Microsoft Academic Graph Europe PubMed Central Vrije Universiteit Amsterdam (VU Amsterdam) – Research Portal KITopen University of Groningen Research Portal UnpayWall PubMed Central European Union Open Data Portal https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JD030387 https://doi.org/10.1029/2019jd030387 Journal of Geophysical Research: Atmospheres Open Access 2019-06-19 Abstract<p>The triple oxygen isotope signature ￎﾔ17O in atmospheric CO2, also known as its ￢ﾀﾜ17O excess,￢ﾀﾝ 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￢ﾀﾐD model simulations for ￎﾔ17O in atmospheric CO2 together with a detailed model description and sensitivity analyses. In our 3￢ﾀﾐD model framework we include the stratospheric source of ￎﾔ17O in CO2 and the surface sinks from vegetation, soils, ocean, biomass burning, and fossil fuel combustion. The effect of oxidation of atmospheric CO on ￎﾔ17O in CO2 is also included in our model. We estimate that the global mean ￎﾔ17O (defined as with ￎﾻRL = 0.5229) of CO2 in the lowest 500ￂﾠm of the atmosphere is 39.6ￂﾠper meg, which is ￢ﾈﾼ20ￂﾠper meg lower than estimates from existing box models. We compare our model results with a measured stratospheric ￎﾔ17O in CO2 profile from Sodankylￃﾤ (Finland), which shows good agreement. In addition, we compare our model results with tropospheric measurements of ￎﾔ17O in CO2 from Gￃﾶttingen (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 ￎﾔ17O in tropospheric CO2 that can help to further increase our understanding of the global budget of ￎﾔ17O in atmospheric CO2.</p> CARBONIC-ANHYDRASE ACTIVITY 550 STRATOSPHERIC CO2 STOMATAL CONDUCTANCE TRACER stable isotopes MASS carbon dioxide (CO) 01 natural sciences 7. Clean energy DIOXIDE EXCHANGE O excess (ΔO) 3-DIMENSIONAL SYNTHESIS carbon dioxide (CO2) carbon cycle O-17 excess (Delta O-17) SDG 13 - Climate Action SDG 14 - Life Below Water Research Articles 0105 earth and related environmental sciences O-18 CONTENT info:eu-repo/classification/ddc/550 mass-independent fractionation (MIF) ddc:550 gross primary production (GPP) 15. Life on land Earth sciences 13. Climate action MODEL TM5 17O excess (Δ17O) FIRE EMISSIONS Ivar R. van der Velde, Ivar R. van der Velde, Wouter Peters, Wouter Peters, Peter Bergamaschi, Sasadhar Mahata, Linda Schneider, Ingrid T. van der Laan-Luijkx, Sergey Gromov, Dorota J. Mrozek Martino, Magdalena E. G. Hofmann, Getachew A. Adnew, Maarten Krol, Maarten Krol, Thomas Röckmann, Erik van Schaik, Mao-Chang Liang, Gerbrand Koren, 2019-08-04 journalpaper Abstract<p>The triple oxygen isotope signature ￎﾔ17O in atmospheric CO2, also known as its ￢ﾀﾜ17O excess,￢ﾀﾝ 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￢ﾀﾐD model simulations for ￎﾔ17O in atmospheric CO2 together with a detailed model description and sensitivity analyses. In our 3￢ﾀﾐD model framework we include the stratospheric source of ￎﾔ17O in CO2 and the surface sinks from vegetation, soils, ocean, biomass burning, and fossil fuel combustion. The effect of oxidation of atmospheric CO on ￎﾔ17O in CO2 is also included in our model. We estimate that the global mean ￎﾔ17O (defined as with ￎﾻRL = 0.5229) of CO2 in the lowest 500ￂﾠm of the atmosphere is 39.6ￂﾠper meg, which is ￢ﾈﾼ20ￂﾠper meg lower than estimates from existing box models. We compare our model results with a measured stratospheric ￎﾔ17O in CO2 profile from Sodankylￃﾤ (Finland), which shows good agreement. In addition, we compare our model results with tropospheric measurements of ￎﾔ17O in CO2 from Gￃﾶttingen (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 ￎﾔ17O in tropospheric CO2 that can help to further increase our understanding of the global budget of ￎﾔ17O in atmospheric CO2.</p> Global 3-D Simulations of the Triple Oxygen Isotope Signature Δ 17 O in Atmospheric CO 2 10.1029/2019jd030387