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| Titel |
Four years of atmospheric oxygen and carbon dioxide record at Ivittuut, southern Greenland |
| VerfasserIn |
J.-L. Bonne, M. Delmotte, J. V. Lavrič, A. C. Manning, L. Bopp, W. Brand, V. Kazan, A. Stohl, O. Cloué |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067430
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| Zusammenfassung |
| Since September 2007, the atmospheric monitoring station of Ivittuut, southern Greenland
(61.21Ë N, 48.17Ë W), has continuously recorded the atmospheric CO2 mixing ratio, O2/N2
ratio and a set of meteorological parameters (temperature, pressure, relative humidity, wind
speed and wind direction). Regular flask sampling provides an additional record of
CO2, CH4, CO, N2O, H2, SF6, O2/N2mixing ratio and CO2 isotopes (δ18O and
δ13C), which is also used to control the quality of the CO2 and O2/N2 continuous
measurements.
Four years of atmospheric CO2 and O2/N2 (a proxy for O2 concentration) measurements
will be presented. The seasonal and inter-annual variability will be compared with the results
from other high latitude sites (Alert and Point Barrow). From 2007 to 2011, our
measurements show a multi-annual trend of +2.0 ppm/year and -12.7 perMeg/year
respectively for CO2 and O2/N2, with annual peak-to-peak amplitude of 16.8 +/- 0.5 ppm and
135 +/- 13 perMeg. We will investigate the implications of our data in terms of
APO (Atmospheric Potential Oxygen), a tracer of the oceanic component of the O2
cycle, invariant to exchanges in the land biota, pointing out the role of the ocean
in CO2 and O2 variability, with a special emphasis on the Atlantic ocean in our
case.
Selected synoptic events associated with short term changes in atmospheric
composition will be analysed in relationship with air mass origins. For this purpose, local
meteorological information is completed by large scale backward simulations of
air masses transportation, using the semi-Lagrangian particle dispersion model
Flexpart. This analysis allows characterising the influence zones crossed by the air
masses versus local contamination. The temporal variability in greenhouse gases
concentration at Ivittuut is then compared and analysed with respect to changes in
air masses origin, and potential charge or discharge of atmospheric greenhouse
gases. We therefore perform a systematic classification of air masses by origin and
regions of influence, in relationship with large scale modes of climate variability. |
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