Atmospheric measurements of Δ17O in CO2 in Göttingen, Germany reveal a seasonal cycle driven by biospheric uptake

Hofmann, Magdalena E. G.; Horváth, Balázs; Schneider, Linda; Peters, Wouter; Schützenmeister, Klaus; Pack, Andreas

doi:10.1016/j.gca.2016.11.019

Cited by 41 publications

(115 citation statements)

References 67 publications

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“…The Hovmöller diagram in Figure a shows that the Northern Hemisphere experiences the largest seasonal variation and that the decrease in Δ 17 O occurs during the summer months for both hemispheres. Figure b shows the temporal variation of Δ 17 O in CO 2 integrated over both hemispheres and for the global domain compared to box model predictions from Hoag et al () and Hofmann et al (). Our 3‐D model predicts an average Δ 17 O signature of 39.6 per meg for CO 2 in the lowest 500 m of the atmosphere, which is roughly 20 per meg lower than the prediction from the box model by Hofmann et al ().…”

Section: Resultsmentioning

confidence: 99%

“…The resulting Δ 17 O signature in tropospheric CO 2 reflects a dynamic balance of highly enriched stratospheric CO 2 and equilibration that occurs in vegetation and other water reservoirs. Tropospheric measurements of Δ 17 O in CO 2 have previously been performed in Jerusalem, Israel (Barkan & Luz, ); La Jolla, United States (Thiemens et al, ); Taipei, Taiwan (Liang & Mahata, ; Liang et al, , ; Mahata et al, ), Göttingen, Germany (Hofmann et al, ), and Palos Verdes, United States (Liang et al, ).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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 Δ17normalO=lnfalse(δ17normalO+1false)−λRL·lnfalse(δ18normalO+1false) 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.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Precise measurements of the Δ 17 O of CO 2 may therefore help to better constrain the exchange of CO 2 between the atmosphere and the biosphere/hydrosphere. For several processes it has been shown that Δ 17 O is a more suitable tracer than the δ 18 O value alone …”

Section: Introductionmentioning

confidence: 99%

“…For several processes it has been shown that Δ 17 O is a more suitable tracer than the δ 18 O value alone. [21][22][23][24] Determination of Δ 17 O in CO 2 with traditional isotope ratio mass spectrometry techniques remains challenging due to the isobaric interference of 13 C 16 O 16 O (exact mass 44.9932) and 12 [34][35][36] Very small variations in the δ 13 C value are used to quantify fluxes between atmosphere and hydrosphere and/or ocean [37][38][39][40][41] . Due to the mass interference of 12 Recently developed high-resolution isotope ratio mass spectrometers 48,49 are designed to overcome limitations of traditional isotope ratio mass spectrometer systems in terms of mass resolution and sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Determination of the triple oxygen and carbon isotopic composition of CO₂ from atomic ion fragments formed in the ion source of the 253 Ultra high‐resolution isotope ratio mass spectrometer

Adnew

Hofmann

Paul

et al. 2019

Rapid Comm Mass Spectrometry

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Rationale Determination of δ17O values directly from CO2 with traditional gas source isotope ratio mass spectrometry is not possible due to isobaric interference of 13C16O16O on 12C17O16O. The methods developed so far use either chemical conversion or isotope equilibration to determine the δ17O value of CO2. In addition, δ13C measurements require correction for the interference from 12C17O16O on 13C16O16O since it is not possible to resolve the two isotopologues. Methods We present a technique to determine the δ17O, δ18O and δ13C values of CO2 from the fragment ions that are formed upon electron ionization in the ion source of the Thermo Scientific 253 Ultra high‐resolution isotope ratio mass spectrometer (hereafter 253 Ultra). The new technique is compared with the CO2‐O2 exchange method and the 17O‐correction algorithm for δ17O and δ13C values, respectively. Results The scale contractions for δ13C and δ18O values are slightly larger for fragment ion measurements than for molecular ion measurements. The δ17O and Δ17O values of CO2 can be measured on the 17O+ fragment with an internal error that is a factor 1–2 above the counting statistics limit. The ultimate precision depends on the signal intensity and on the total time that the 17O+ beam is monitored; a precision of 14 ppm (parts per million) (standard error of the mean) was achieved in 20 hours at the University of Göttingen. The Δ17O measurements with the O‐fragment method agree with the CO2‐O2 exchange method over a range of Δ17O values of −0.3 to +0.7‰. Conclusions Isotope measurements on atom fragment ions of CO2 can be used as an alternative method to determine the carbon and oxygen isotopic composition of CO2 without chemical processing or corrections for mass interferences.

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“…To convert to the l value of 0.528, Δ 17 O(leaf)l=0.528= Δ 17 O(leaf)l=0.5229+(0.5229-0.528)´lnatrans. atrans =1/0.9917 (Koren et 660 al., 2019;Hofmann et al, 2017).…”

Section: Derivation Of the 18 O-photosynthetic Discriminationmentioning

confidence: 99%

Supplementary material to "Leaf-scale quantification of the effect of photosynthetic gas exchange on Δ<sup>17</sup>O of atmospheric CO<sub>2</sub>"

Adnew¹,

Pons²,

Koren³

et al. 2020

Preprint

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Atmospheric measurements of Δ17O in CO2 in Göttingen, Germany reveal a seasonal cycle driven by biospheric uptake

Cited by 41 publications

References 67 publications

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

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

Determination of the triple oxygen and carbon isotopic composition of CO₂ from atomic ion fragments formed in the ion source of the 253 Ultra high‐resolution isotope ratio mass spectrometer

Supplementary material to "Leaf-scale quantification of the effect of photosynthetic gas exchange on Δ<sup>17</sup>O of atmospheric CO<sub>2</sub>"

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Atmospheric measurements of Δ17O in CO2 in Göttingen, Germany reveal a seasonal cycle driven by biospheric uptake

Cited by 41 publications

References 67 publications

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

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

Determination of the triple oxygen and carbon isotopic composition of CO2 from atomic ion fragments formed in the ion source of the 253 Ultra high‐resolution isotope ratio mass spectrometer

Supplementary material to &quot;Leaf-scale quantification of the effect of photosynthetic gas exchange on Δ&lt;sup&gt;17&lt;/sup&gt;O of atmospheric CO&lt;sub&gt;2&lt;/sub&gt;&quot;

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

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

Determination of the triple oxygen and carbon isotopic composition of CO₂ from atomic ion fragments formed in the ion source of the 253 Ultra high‐resolution isotope ratio mass spectrometer

Supplementary material to "Leaf-scale quantification of the effect of photosynthetic gas exchange on Δ<sup>17</sup>O of atmospheric CO<sub>2</sub>"