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  Seasonal, synoptic, and diurnal-scale variability of biogeochemical trace gases and O2 from a 300-m tall tower in central Siberia

Kozlova, E. A., Manning, A. C., Kisilyakhov, Y., Seifert, T., & Heimann, M. (2008). Seasonal, synoptic, and diurnal-scale variability of biogeochemical trace gases and O2 from a 300-m tall tower in central Siberia. Global Biogeochemical Cycles, 22(4), B4020. doi:10.1029/2008GB003209.

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 Urheber:
Kozlova, E. A.1, Autor           
Manning, A. C., Autor
Kisilyakhov, Y., Autor
Seifert, T.1, Autor           
Heimann, M.2, Autor           
Affiliations:
1Tall Tower Atmospheric Gas Measurements, Dr. J. Lavrič, Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497786              
2Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497755              

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Schlagwörter: Atmospheric oxygen measurements Southern-hemisphere air Global carbon budget Interannual variability O-2/n-2 ratio CO2 Cycle Dioxide Methane Exchange
 Zusammenfassung: We present first results from 19 months of semicontinuous concentration measurements of biogeochemical trace gases (CO2, CO, and CH4) and O-2, measured at the Zotino Tall Tower Observatory (ZOTTO) in the boreal forest of central Siberia. We estimated CO2 and O2 seasonal cycle amplitudes of 26.6 ppm and 134 per meg, respectively. An observed west-east gradient of about -7 ppm (in July 2006) between Shetland Islands, Scotland, and ZOTTO reflects summertime continental uptake of CO2 and is consistent with regional modeling studies. We found the oceanic component of the O-2 seasonal amplitude (Atmospheric Potential Oxygen, or APO) to be 51 per meg, significantly smaller than the 95 per meg observed at Shetlands, illustrating a strong attenuation of the oceanic O-2 signal in the continental interior. Comparison with the Tracer Model 3 (TM3) atmospheric transport model showed good agreement with the observed phasing and seasonal amplitude in CO2; however, the model exhibited greater O-2 (43 per meg, 32%) and smaller APO (9 per meg, 18%) amplitudes. This seeming inconsistency in model comparisons between O-2 and APO appears to be the result of phasing differences in land and ocean signals observed at ZOTTO, where ocean signals have a significant lag. In the first 2 months of measurements on the fully constructed tower (November and December 2006), we observed several events with clear vertical concentration gradients in all measured species except CO. During "cold events'' (below -30 degrees C) in November 2006, we observed large vertical gradients in CO2 (up to 22 ppm), suggesting a strong local source. The same pattern was observed in CH4 concentrations for the same events. Diurnal vertical CO2 gradients in April to May 2007 gave estimates for average nighttime respiration fluxes of 0.04 +/- 0.02 mol C m(-2) d(-1), consistent with earlier eddy covariance measurements in 1999-2000 in the vicinity of the tower. [References: 79]

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 Datum: 2008
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1029/2008GB003209
Anderer: BGC1188
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Titel: Global Biogeochemical Cycles
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Washington, DC : American Geophysical Union
Seiten: - Band / Heft: 22 (4) Artikelnummer: - Start- / Endseite: B4020 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/954925553383
ISSN: 0886-6236