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| Titel |
Quantification of methane emission rates from coal mine ventilation shafts using airborne remote sensing data |
| VerfasserIn |
T. Krings, K. Gerilowski, M. Buchwitz, J. Hartmann, T. Sachs, J. Erzinger, J. P. Burrows, H. Bovensmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 1 ; Nr. 6, no. 1 (2013-01-30), S.151-166 |
| Datensatznummer |
250017378
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| Publikation (Nr.) |
 copernicus.org/amt-6-151-2013.pdf |
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| Zusammenfassung |
The quantification of emissions of the greenhouse gas methane is essential
for attributing the roles of anthropogenic activity and natural phenomena in
global climate change. Our current measurement systems and networks, whilst
having improved during the last decades, are deficient in many respects. For
example, the emissions from localised and point sources such as landfills or
fossil fuel exploration sites are not readily assessed. A tool developed to
better understand point sources of the greenhouse gases carbon dioxide and
methane is the optical remote sensing instrument MAMAP (Methane airborne MAPper), operated from
aircraft. After a recent instrument modification, retrievals of the column-averaged
dry air mole fractions for methane XCH4 (or for
carbon dioxide XCO2) derived from MAMAP data have
a precision of about 0.4% or better and thus can be used to infer
emission rate estimates using an optimal estimation inverse Gaussian plume
model or a simple integral approach.
CH4 emissions from two coal mine ventilation shafts in western
Germany surveyed during the AIRMETH 2011 measurement campaign are used as
examples to demonstrate and assess the value of MAMAP data for quantifying
CH4 from point sources. While the knowledge of the wind is an
important input parameter in the retrieval of emissions from point sources
and is generally extracted from models, additional information from
a turbulence probe operated on-board the same aircraft was utilised to
enhance the quality of the emission estimates. Although flight patterns were
optimised for remote sensing measurements, data from an in situ analyser for
CH4 were found to be in good agreement with retrieved dry columns of
CH4 from MAMAP and could be used to investigate and refine underlying
assumptions for the inversion procedures.
With respect to the total emissions of the mine at the time of the
overflight, the inferred emission rate of
50.4 kt CH4 yr−1 has a difference of less than
1% compared to officially reported values by the mine operators, while
the uncertainty, which reflects variability of the sources and conditions as
well as random and systematic errors, is about ±13.5%. |
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