Sources of the oxygen isotopic anomaly in atmospheric N<sub>2</sub>O

Liang, Mao‐Chang; Yung, Yuk L.

doi:10.1029/2006jd007876

Cited by 17 publications

(30 citation statements)

References 45 publications

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“…Hence similarly, if one can get an improved understanding for F str from, for example, extensive mid-tropospheric measurements58, F sur can be better determined. We expect the utilization of multiple tracers (such as N 2 O) obtained by the CARIBIC project58 along with Δ 17 O in CO 2 and a global model454664 could place a strong constraint on the strength of the cross-tropopause exchange, in particular with the use of the correlation of Δ 17 O and [N 2 O] in the upper troposphere. The uniqueness of Δ 17 O and [N 2 O] lies on their chemical properties in the atmosphere: both are inert in the free troposphere but significantly altered in the stratosphere45475964.…”

Section: Discussion and Summarymentioning

confidence: 99%

Oxygen anomaly in near surface carbon dioxide reveals deep stratospheric intrusion

Liang

Mahata

2015

Sci Rep

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Stratosphere-troposphere exchange could be enhanced by tropopause folding, linked to variability in the subtropical jet stream. Relevant to tropospheric biogeochemistry is irreversible transport from the stratosphere, associated with deep intrusions. Here, oxygen anomalies in near surface air CO2 are used to study the irreversible transport from the stratosphere, where the triple oxygen isotopes of CO2 are distinct from those originating from the Earth’s surface. We show that the oxygen anomaly in CO2 is observable at sea level and the magnitude of the signal increases during the course of our sampling period (September 2013-February 2014), concordant with the strengthening of the subtropical jet system and the East Asia winter monsoon. The trend of the anomaly is found to be 0.1‰/month (R2 = 0.6) during the jet development period in October. Implications for utilizing the oxygen anomaly in CO2 for CO2 biogeochemical cycle study and stratospheric intrusion flux at the surface are discussed.

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Section: Discussion and Summarymentioning

confidence: 99%

Oxygen anomaly in near surface carbon dioxide reveals deep stratospheric intrusion

Liang

Mahata

2015

Sci Rep

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“…Oxygen isotopic compositions are reported as δ 17 O and δ 18 O. To be consistent with previous work [ Miller et al , 2005; Liang et al , 2006, 2007; Liang and Yung , 2007], we define them here as …”

Section: Introductionmentioning

confidence: 94%

“…See Liang et al [2006] for details. Following the same assumption as Liang et al [2006, 2007] and Liang and Yung [2007], we only consider the terminal abstraction of ozone photolysis for the production of O( 1 D) atoms.…”

Section: Mechanisms Of Co2 Isotopic Fractionationmentioning

confidence: 99%

“…Under current atmospheric conditions, the timescale of dynamical processes is shorter than that of the CO 2 isotopic exchange, resulting in a large modification of the isotopic enrichment of CO 2 that originates from exchange with O( 1 D). This is the main reason for the great difference between the isotopic composition of O( 1 D) (∼100‰) [ Liang et al , 2006; Liang and Yung , 2007] and that of CO 2 (∼10‰). The factor of 10 difference between O( 1 D) and CO 2 implies that f 1 = f 2 ≈ 0.1, determined by the steady state assumption in and .…”

Section: Mechanisms Of Co2 Isotopic Fractionationmentioning

confidence: 99%

“…The transport ( ψ , K yy , and K zz ) of Morgan et al [2004] is selected to be our reference case (model A), as it has been used to simulate the seasonality of upper tropospheric CO 2 [ Shia et al , 2006] and to the study of the sources of the oxygen isotopic anomaly in atmospheric N 2 O [ Liang and Yung , 2007]. Residual circulations ( ψ ) derived from the National Centers for Environmental Prediction‐Department of Energy Reanalysis 2 (NCEP2) [ Kistler et al , 2001], European Centre for Medium‐Range Weather Forecasts Reanalysis (ECMWF) [ Uppala et al , 2005], and Whole Atmosphere Community Climate Model (WACCM) outputs [ Sassi et al , 2002, 2004] are also included, in order to provide a model sensitivity analysis with respect to changes in circulation.…”

Section: Data and Model Descriptionsmentioning

confidence: 99%

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Seasonal cycle of C¹⁶O¹⁶O, C¹⁶O¹⁷O, and C¹⁶O¹⁸O in the middle atmosphere: Implications for mesospheric dynamics and biogeochemical sources and sinks of CO₂

Liang¹,

Blake²,

Yung³

2008

J. Geophys. Res.

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Here we present a two-dimensional simulation of the isotopic composition of CO 2 from the surface to an altitude of $130 km that adequately reproduce the observed seasonal cycle of CO 2 in the upper troposphere and the age of air in the stratosphere. Our model results suggest that stratospheric-tropospheric exchange not only modifies the level of heavy CO 2 in the troposphere, but also influences its seasonal cycle. Thus the isotopic composition of CO 2 in the troposphere/biosphere could be affected by the downwelling air from the stratosphere. The predicted size of the effect is detectable by current instrumentation. Implications for the use of the isotopic composition of CO 2 to constrain the gross carbon flux between the atmosphere and terrestrial biosphere and the dynamics in the remote mesosphere are discussed. O in the middle atmosphere: Implications for mesospheric dynamics and biogeochemical sources and sinks of CO 2 ,

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Composition and Chemistry of the Neutral Atmosphere of Venus

Marcq¹,

Mills²,

Sandor³

et al. 2017

Space Sci Rev

117

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International audienceThis paper deals with the composition and chemical processes occurring in the neutral atmosphere of Venus. Since the last synthesis, observers as well as modellers have emphasised the spatial and temporal variability of minor species, going beyond a static and uniform picture that may have prevailed in the past. The outline of this paper acknowledges this situation and follows closely the different dimensions along which variability in composition can be observed: vertical, latitudinal, longitudinal, temporal. The strong differences between the atmosphere below and above the cloud layers also dictate the structure of this paper. Observational constraints, obtained from both Earth and Venus Express, as well as 1D, 2D and 3D models results obtained since 1997 are also extensively referred and commented by the authors. An non-exhaustive list of topics included follows: modelled and observed latitudinal and vertical profiles of CO and OCS below the clouds of Venus; vertical profiles of CO and SO2 above the clouds as observed by solar occultation and modelled; temporal and spatial variability of sulphur oxides above the clouds. As a conclusion, open questions and topics of interest for further studies are discussed

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Sources of the oxygen isotopic anomaly in atmospheric N₂O

Cited by 17 publications

References 45 publications

Oxygen anomaly in near surface carbon dioxide reveals deep stratospheric intrusion

Oxygen anomaly in near surface carbon dioxide reveals deep stratospheric intrusion

Seasonal cycle of C¹⁶O¹⁶O, C¹⁶O¹⁷O, and C¹⁶O¹⁸O in the middle atmosphere: Implications for mesospheric dynamics and biogeochemical sources and sinks of CO₂

Composition and Chemistry of the Neutral Atmosphere of Venus

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Sources of the oxygen isotopic anomaly in atmospheric N2O

Cited by 17 publications

References 45 publications

Oxygen anomaly in near surface carbon dioxide reveals deep stratospheric intrusion

Oxygen anomaly in near surface carbon dioxide reveals deep stratospheric intrusion

Seasonal cycle of C16O16O, C16O17O, and C16O18O in the middle atmosphere: Implications for mesospheric dynamics and biogeochemical sources and sinks of CO2

Composition and Chemistry of the Neutral Atmosphere of Venus

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Sources of the oxygen isotopic anomaly in atmospheric N₂O

Seasonal cycle of C¹⁶O¹⁶O, C¹⁶O¹⁷O, and C¹⁶O¹⁸O in the middle atmosphere: Implications for mesospheric dynamics and biogeochemical sources and sinks of CO₂