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| Titel |
Quantification of CO2 and CH4 megacity emissions using portable solar absorption spectrometers |
| VerfasserIn |
Matthias Frey, Frank Hase, Thomas Blumenstock, Isamu Morino, Kei Shiomi |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149826
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| Publikation (Nr.) |
 EGU/EGU2017-14218.pdf |
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| Zusammenfassung |
| Urban areas already contribute to over 50% of the global population, additionally the
percentage of the worldwide population living in Metropolitan areas is continuously
growing. Thus, a precise knowledge of urban greenhouse gas (GHG) emissions
is of utmost importance. Whereas, however, GHG emissions on a nationwide to
continental scale can be relatively precisely estimated using satellite observations (and
fossil fuel consumption statistics), reliable estimations for local to regional scale
emissions pose a bigger problem due to lack of timely and spatially high resolved
satellite data and possible biases of passive spectroscopic nadir observations (e.g.
enhanced aerosol scattering in a city plume). Furthermore, emission inventories
on the city scale might be missing contributions (e.g. methane leakage from gas
pipes).
Here, newly developed mobile low resolution Fourier Transform spectrometers (Bruker
EM27/SUN) are utilized to quantify small scale emissions. This novel technique was
successfully tested before by KIT and partners during campaigns in Berlin, Paris and
Colorado for detecting emissions from various sources.
We present results from a campaign carried out in February – April 2016 in the Tokyo bay
area, one of the biggest Metropolitan areas worldwide. We positioned two EM27/SUN
spectrometers on the outer perimeter of Tokyo along the prevailing wind axis upwind and
downwind of the city source. Before and after the campaign, calibration measurements were
performed in Tsukuba with a collocated high resolution FTIR spectrometer from the Total
Carbon Column Observing Network (TCCON).
During the campaign the observed XCO2 and XCH4 values vary significantly. Additionally,
intraday variations are observed at both sites. Furthermore, an enhancement due to the Tokyo
area GHG emissions is clearly visible for both XCO2 and XCH4. The observed signals are
significantly higher compared to prior campaigns targeting other major cities. We perform a
rough estimate of the source strength. Finally, a comparison with an observation from the
OCO-2 satellite is shown. |
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