Dataset Information

Global 3-D Simulations of the Triple Oxygen Isotope Signature ?17O in Atmospheric CO2.

ABSTRACT: The triple oxygen isotope signature ?17O 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 ?17O in atmospheric CO2 together with a detailed model description and sensitivity analyses. In our 3-D model framework we include the stratospheric source of ?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 ?17O in CO2 is also included in our model. We estimate that the global mean ?17O (defined as ?17O=ln(?17O+1)-?RL·ln(?18O+1) with ? RL = 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 ?17O in CO2 profile from Sodankylä (Finland), which shows good agreement. In addition, we compare our model results with tropospheric measurements of ?17O 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 ?17O in tropospheric CO2 that can help to further increase our understanding of the global budget of ?17O in atmospheric CO2.

SUBMITTER: Koren G

PROVIDER: S-EPMC6774299 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Publications

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

Koren Gerbrand G Schneider Linda L van der Velde Ivar R IR van Schaik Erik E Gromov Sergey S SS Adnew Getachew A GA Mrozek Martino Dorota J DJ Hofmann Magdalena E G MEG Liang Mao-Chang MC Mahata Sasadhar S Bergamaschi Peter P van der Laan-Luijkx Ingrid T IT Krol Maarten C MC Röckmann Thomas T Peters Wouter W

Journal of geophysical research. Atmospheres : JGR 20190804 15

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 Δ<sup ...[more]

PMID: 31598450

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Project description:Understanding physiological traits and ecological conditions that influence a species reliance on metabolic water is critical to creating accurate physiological models that can assess their ability to adapt to environmental perturbations (e.g., drought) that impact water availability. However, relatively few studies have examined variation in the sources of water animals use to maintain water balance, and even fewer have focused on the role of metabolic water. A key reason is methodological limitations. Here, we applied a new method that measures the triple oxygen isotopic composition of a single blood sample to estimate the contribution of metabolic water to the body water pool of three passerine species. This approach relies on Δ'17O, defined as the residual from the tight linear correlation that naturally exists between δ17O and δ18O values. Importantly, Δ'17O is relatively insensitive to key fractionation processes, such as Rayleigh distillation in the water cycle that have hindered previous isotope-based assessments of animal water balance. We evaluated the effects of changes in metabolic rate and water intake on Δ'17O values of captive rufous-collared sparrows (Zonotrichia capensis) and two invertivorous passerine species in the genus Cinclodes from the field. As predicted, colder acclimation temperatures induced increases in metabolic rate, decreases in water intake, and increases in the contribution of metabolic water to the body water pool of Z. capensis, causing a consistent change in Δ'17O. Measurement of Δ'17O also provides an estimate of the δ18O composition of ingested pre-formed (drinking/food) water. Estimated δ18O values of drinking/food water for captive Z. capensis were ~ -11‰, which is consistent with that of tap water in Santiago, Chile. In contrast, δ18O values of drinking/food water ingested by wild-caught Cinclodes were similar to that of seawater, which is consistent with their reliance on marine resources. Our results confirm the utility of this method for quantifying the relative contribution of metabolic versus pre-formed drinking/food water to the body water pool in birds.

Dataset Information

Global 3-D Simulations of the Triple Oxygen Isotope Signature ?17O in Atmospheric CO2.

Publications

Global 3-D Simulations of the Triple Oxygen Isotope Signature Δ<sup>17</sup>O in Atmospheric CO<sub>2</sub>.

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