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| Titel |
Daily global fire radiative power fields estimation from one or two MODIS instruments |
| VerfasserIn |
S. Remy, J. W. Kaiser |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 24 ; Nr. 14, no. 24 (2014-12-16), S.13377-13390 |
| Datensatznummer |
250119243
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| Publikation (Nr.) |
 copernicus.org/acp-14-13377-2014.pdf |
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| Zusammenfassung |
Fires are important emitters of aerosol and trace gases and as such need to
be taken into account in any atmospheric composition modelling enterprise. One
method to estimate these emissions is to convert fire radiative power (FRP)
analysis into dry matter burnt and emissions of smoke constituents using
land-cover-dependent conversion factors. Inventories like the Global Fire
Assimilation System (GFAS) follow this approach by calculating daily global
smoke emissions from FRP observed by the MODIS instruments onboard the
Terra and Aqua satellites. Observations with different overpass times
systematically sample fires at different stages in the strong diurnal fire
cycle. For some time periods, observations are available from only one
instrument, which leads to a bias in the observed average FRP.
We develop a method to correct this bias in daily FRP observations from any
low Earth orbit (LEO) satellite, so that the budget of daily smoke emissions
remains independent of the number of satellites from which FRP observations
are taken into account. This ensures the possibility of running, for example, GFAS
in case of failure of one of the MODIS instruments. It also enables the
extension GFAS to 2000–2002 and the inclusion of FRP observations from
upcoming satellite missions. The correction combines linear and non-linear
regressions and uses an adaptive regionalization algorithm. It decreases the
bias in daily average FRP from Terra and Aqua by more than 95%, and RMSE
by 75% for Aqua and 55% for Terra. The correction algorithm is applied
to Terra observations from 25 February 2000 to 31 December 2002, when Aqua observations
were not available. The database of fire emissions GFASv1.0 is extended
correspondingly. |
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