The seasonal cycle of N<sub>2</sub>O

Liao, Tien-Hao; Camp, C. D.; Yung, Yuk L.

doi:10.1029/2004gl020345

Cited by 25 publications

(28 citation statements)

References 10 publications

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“…Unlike N 2 O, which has no noticeable sink in the troposphere, CO 2 has significant gross carbon exchange between the atmosphere and the surface. (The insignificance of a nitrous oxide sink in the troposphere can be similarly inferred from the weak seasonality observed [ Liao et al , 2004; Nevison et al , 2004]). The flux between the atmosphere and ocean and that between the atmosphere and land are 90 and 120 PgC/a, respectively, while the net flux to the ocean and land is only ∼1.9 PgC/a.…”

Section: Sources and Sinks Of Co2 Isotopologuesmentioning

confidence: 96%

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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Section: Sources and Sinks Of Co2 Isotopologuesmentioning

confidence: 96%

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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“…7c). Although the accepted value for the SP of atmospheric N 2 O was determined in air samples from the North West Pacific, the high mixing rates of tropospheric gases and the high residence times of atmospheric N 2 O over 120 years (Liao et al, 2004) make the value given by Yoshida and Toyoda (2000) a good approximation.…”

Section: General Water Column Characteristicsmentioning

confidence: 99%

Nitrous oxide distribution and its origin in the central and eastern South Pacific Subtropical Gyre

Charpentier¹,

Farı́as²,

Yoshida

et al. 2007

Biogeosciences

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Abstract. The mechanisms of microbial nitrous oxide (N 2 O) production in the ocean have been the subject of many discussions in recent years. New isotopomeric tools can further refine our knowledge of N 2 O sources in natural environments. This study compares hydrographic, N 2 O concentration, and N 2 O isotopic and isotopomeric data from three stations along a coast-perpendicular transect in the South Pacific Ocean, extending from the center (Sts. GYR and EGY) of the subtropical oligotrophic gyre (∼26 • S; 114 • W) to the upwelling zone (St. UPX) off the central Chilean coast (∼34 • S). Although AOU/N 2 O and NO − 3 trends support the idea that most of the N 2 O (mainly from intermediate water (200-600 m)) comes from nitrification, N 2 O isotopomeric composition (intramolecular distribution of 15 N isotopes) expressed as SP (site preference of 15 N) shows low values (10 to 12‰) that could be attributed to the production through of microbial nitrifier denitrification (reduction of nitrite to N 2 O mediated by ammonium oxidizers). The coincidence of this SP signal with high -stability layer, where sinking organic particles can accumulate, suggests that N 2 O could be produced by nitrifier denitrification inside particles. It is postulated that deceleration of particles in the pycnocline can modify the advection -diffusion balance inside particles, allowing the accumulation of nitrite and O 2 depletion suitable for nitrifier denitrication. As lateral advection seems to be relatively insignificant in the gyre, in situ nitrifier denitrification could account for 40-50% of the N 2 O produced in this Correspondence to: J. Charpentier (jcharpentier@profc.udec.cl) layer. In contrast, coastal upwelling system is characterized by O 2 deficient condition and some N deficit in a eutrophic system. Here, N 2 O accumulates up to 480% saturation, and isotopic and isotopomer signals show highly complex N 2 O production processes, which presumably reflect both the effect of nitrification and denitrification at low O 2 levels on N 2 O production, but net N 2 O consumption by denitrification was not observed.

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“…N 2 O has a weak seasonal cycle in the troposphere with a summer minimum and an amplitude in the Northern Hemisphere of about 0.8 ppb at the surface (Liao et al, 2004;Nevison et al, 2007). It was suggested that this is related to transport of N 2 O depleted air from the stratosphere into the troposphere (Morgan et al, 2004;Nevison et al, 2004).…”

Section: Flights Frankfurt ↔ Guangzhou ↔ Manilamentioning

confidence: 99%

Greenhouse gas analysis of air samples collected onboard the CARIBIC passenger aircraft

Schuck¹,

Brenninkmeijer²,

Šlemr³

et al. 2009

Atmos. Meas. Tech.

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Abstract. CARIBIC (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) is a long-term atmospheric measurement program based on the use of a comprehensive scientific instrument package aboard a commercial passenger aircraft. In addition to realtime measurements, whole air sampling is performed regularly at cruising altitudes in the tropical middle troposphere and the extra-tropical UT/LS region. Air samples are analyzed for greenhouse gases, NMHCs, halocarbons, and trace gas isotopic composition. The routinely performed greenhouse gas analysis comprises gas chromatography measurements of CO 2 , CH 4 , N 2 O and SF 6 .The air sampling procedure, the GC system and its performance are described. Comparisons with similar systems employed in other laboratories and a comparison with results from a CO 2 in-situ analyzer that is also part of the CARIBIC instrumentation are shown. In addition, the time series of CO 2 , obtained from the collection of 684 samples at latitudes between 30 • N and 56 • N on 21 round trips out of Germany to different destinations in Asia between November 2005 and October 2008, is presented. A time shift in the seasonal cycle of about one month was observed between the upper troposphere and the tropopause region. For two sets of return flights from Germany to the Philippines the relationship between the four greenhouse gases is briefly discussed.

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The seasonal cycle of N₂O

Cited by 25 publications

References 10 publications

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

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

Nitrous oxide distribution and its origin in the central and eastern South Pacific Subtropical Gyre

Greenhouse gas analysis of air samples collected onboard the CARIBIC passenger aircraft

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The seasonal cycle of N2O

Cited by 25 publications

References 10 publications

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

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

Nitrous oxide distribution and its origin in the central and eastern South Pacific Subtropical Gyre

Greenhouse gas analysis of air samples collected onboard the CARIBIC passenger aircraft

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The seasonal cycle of N₂O

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

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