 |
| Titel |
Co-located column and in situ measurements of CO2 in the tropics compared with model simulations |
| VerfasserIn |
T. Warneke, A. K. Petersen, C. Gerbig, A. Jordan, C. Rödenbeck, M. Rothe, R. Macatangay, J. Notholt, O. Schrems |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 12 ; Nr. 10, no. 12 (2010-06-25), S.5593-5599 |
| Datensatznummer |
250008572
|
| Publikation (Nr.) |
 copernicus.org/acp-10-5593-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| The first ground-based remote sensing measurements of the column averaged
volume mixing ratio of CO2 (XCO2) in tropical South America have
been obtained at Paramaribo, Suriname (5.8° N, 55.2° W). The remote
sensing observations are complemented by surface air-samples collected at
the site, analyzed for CO2 and 13CO2. The surface in-situ
measurements are strongly influenced by local sources. From the isotopic
composition of the air samples the local source component is suggested to be
dominated by the terrestrial biosphere. Using δ13C from the NOAA/ESRL
stations Ascension Is. (ASC), 7.9° S, 14.4° W, and Ragged Point (RPB),
13.2° N, 59.4° W, the data has been corrected for the local source
component. Due to the migration of the Intertropical Convergence Zone (ITCZ)
over the measurement site the sampled air masses belong to the Northern or
Southern Hemisphere depending on the time of the year. Comparison to
analyzed CO2 fields based on TM3 model simulations using optimized
fluxes indicate agreement for the seasonality in XCO2 as well as for
the corrected CO2 mixing ratios at the surface for the long dry season,
when Paramaribo belongs to the Southern Hemisphere. A slightly worse
agreement during the short dry season is attributed to a larger
representation error during this time of the year. Overall the comparison
indicates that the TM3 model is capable to simulate the seasonal variation
of surface concentrations as well as column densities of CO2 correctly
at Paramaribo. It has been also shown that the column measurements currently
performed at Paramaribo have a limited precision and lack the link to the in
situ measurements. Solutions for future improvements have been suggested. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|