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| Titel |
Total Column Greenhouse Gas Monitoring in Central Munich: Automation and Measurements |
| VerfasserIn |
Jia Chen, Ludwig Heinle, Johannes C. Paetzold, Long Le |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250123908
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| Publikation (Nr.) |
 EGU/EGU2016-3247.pdf |
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| Zusammenfassung |
| It is challenging to use in-situ surface measurements of CO2 and CH4 to derive emission
fluxes in urban regions. Surface concentrations typically have high variance due to the
influence of nearby sources, and they are strongly modulated by mesoscale transport
phenomena that are difficult to simulate in atmospheric models.
The integrated amount of a tracer through the whole atmosphere is a direct measure of the
mass loading of the atmosphere given by emissions. Column measurements are insensitive to
vertical redistribution of tracer mass, e.g. due to growth of the planetary boundary layer, and
are also less influenced by nearby point sources, whose emissions are concentrated in a
thin layer near the surface. Column observations are more compatible with the
scale of atmospheric models and hence provide stronger constraints for inverse
modeling.
In Munich we are aiming at establishing a regional sensor network with differential
column measurements, i.e. total column measurements of CO2 and CH4 inside and
outside of the city. The inner-city station is equipped with a compact solar-tracking
Fourier transform spectrometer (Bruker EM27/SUN) in the campus of Technische
Universität München, and our measurements started in Aug. 2015. The measurements
over seasons will be shown, as well as preliminary emission studies using these
observations.
To deploy the compact spectrometers for stationary monitoring of the urban emissions, an
automatic protection and control system is mandatory and a challenging task. It will allow
solar measurements whenever the sun is out and reliable protection of the instrument when it
starts to rain. We have developed a simplified and highly reliable concept for the enclosure,
aiming for a fully automated data collection station without the need of local human
interactions.
Furthermore, we are validating and combining the OCO-2 satellite-based measurements
with our ground-based measurements. For this purpose, we have developed a software tool
that permits spatial, temporal and quality data filtering and selection from the OCO-2
database. We observed inconsistencies between nadir and glint measurements nearby Munich
on consecutive days with similar weather conditions in August 2015. To visualize our
regional sensor network, we have developed software to generate KML-Files, which enables
us to display and browse the results of our measurement site, OCO-2 measurements as well
as future satellite tracks. |
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