 |
| Titel |
Automated Measurements of Greenhouse Gases by Ground-based Fourier |
| VerfasserIn |
J. Messerschmidt, T. Warneke, R. Macatangay, C. Weinzierl, K. Katrynski, J. Notholt |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250031519
|
|
|
|
|
|
| Zusammenfassung |
| Currently Greenhouse Gases are measured basically with In-Situ measurements. However these information
are biased by uncertainties for instance in the knowledge of the vertical transport from the ground through the
troposphere and furthermore their spatial coverage is limited.
Essential improvements will be obtained by Satellite measurements: This remote sensing method can assess the
global coverage of trace gas concentrations and it calculates the total column of the relevant gases. Therefore the
interpretation by inverse models does not require knowledge on the vertical mixing.
The necessity to calibrate and validate Satellite data can be satisfied with ground based FTIR-measurements. With
their properties to measure the total column of gases and to provide data with high precision ground-based remote
sensing FTIR-measurements form the link between the satellites and the surface In-Situ data.
In the framework of two EU-projects GEOmon and IMECC two fully automated FTIR-systems were built
at the Institute of Environmental Physics (IUP) in Bremen, Germany. After the installation the systems were
operated in different test series in comparison with the Bremen TCCON instrument at the Institute until the end of
2008. In the intercomparisons, the CO2/O2 ratios agree considerably well with slight differences coming from the
difference in modulation efficiencies and phase errors. Optical realignments of the instruments greatly reduce the
difference between the O2 and CO2 VMRs.
In the poster the results of the comparison experiments with the Bremen TCCON instrument will be presented.
Furthermore the first measurements of the stations in Poland and France will be analysed, after the transfer of the
FTIR systems took place in the beginning of 2009. |
|
|
|
|
|
|