 |
| Titel |
Variation of CO2 mole fraction in the lower free troposphere, in the boundary layer and at the surface |
| VerfasserIn |
L. Haszpra, M. Ramonet, M. Schmidt, Z. Barcza, Zs. Pátkai, K. Tarczay, C. Yver, J. Tarniewicz, P. Ciais |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 18 ; Nr. 12, no. 18 (2012-09-28), S.8865-8875 |
| Datensatznummer |
250011483
|
| Publikation (Nr.) |
 copernicus.org/acp-12-8865-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Eight years of occasional flask air sampling and 3 years of frequent in situ
measurements of carbon dioxide (CO2) vertical profiles on board of a
small aircraft, over a tall tower greenhouse gases monitoring site in
Hungary are used for the analysis of the variations of vertical profile of
CO2 mole fraction. Using the airborne vertical profiles and the
measurements along the 115 m tall tower it is shown that the measurements at
the top of the tower estimate the mean boundary layer CO2 mole fraction
during the mid-afternoon fairly well, with an underestimation of
0.27–0.85 μmol mol−1 in summer, and an overestimation of
0.66–1.83 μmol mol−1 in winter. The seasonal cycle of
CO2 mole fraction is damped with elevation. While the amplitude of the
seasonal cycle is 28.5 μmol mol−1 at 10 m above the ground, it
is only 10.7 μmol mol−1 in the layer of 2500–3000 m
corresponding to the lower free atmosphere above the well-mixed boundary
layer. The maximum mole fraction in the layer of 2500–3000 m can be
observed around 25 March on average, two weeks ahead of that of the marine
boundary layer reference (GLOBALVIEW). By contrast, close to the ground, the
maximum CO2 mole fraction is observed late December, early January. The
specific seasonal behavior is attributed to the climatology of vertical
mixing of the atmosphere in the Carpathian Basin. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|