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| Titel |
Analysis of satellite-observed CO2 and CH4 of GOSAT for estimation of GHG emissions from power plants and large cities from space |
| VerfasserIn |
Tomohiro Oda, Shamil Maksyutov, Makoto Saito, Vinu Valsala, Alexander Ganshin, Robert Andres, Yuji Koyama, Akihiko Ito, Yukio Yoshida, Tatsuya Yokota |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250037305
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| Zusammenfassung |
| National GHG inventories, which are reported on annual basis by country, are a tool to
monitor the compliance of GHG emission reduction. National emissions are calculated
according to the local activity statistics by sector and thus total emissions and emission
changes from the past are obtained. National inventories are presently the only tool available
to give a measure of national emissions, although these might not accurately reflect the true
quantity of national emissions due to data quality, calculation methods, and time
lag.
We present an attempt to directly monitor GHG emissions, especially from intense sources
such as large power plants and populated cities using GOSAT observations. Our
preliminary analysis suggested that emissions from such intense sources cause changes
in XCO2, which are detectable by GOSAT, in low wind condition. Since August
2009 we have requested GOSAT targeted mode measurements over large power
plants and cities. The large power plants were selected from CARMA (Carbon
Monitoring and Action) database by emission intensity, and cities were selected by
population ranking. Until to December 2009, 137 XCO2 measurements over 98
observation points were successfully obtained. We evaluated difference between the data
at requested points and background concentration, which we defined as monthly
mean concentration over 800 km vicinity. An analysis using observational data
suggested that XCO2 over requested points might be higher than zonal mean and
background concentrations on average, and the range of the difference (1.07 ppm for
3 months) appears to be close to prior estimates. The level of uncertainty at this
point (71 % of the mean value) is still at the level of the value itself, however a
simple estimate suggests that it can be reduced to about 10% assuming a larger
number of measurements, improvements on the retrieval and 5-year operation of
GOSAT. |
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