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| Titel |
Impact of the O2 A and B band in full physics retrievals of CH4 and CO for the future Sentinel 5 mission |
| VerfasserIn |
Leif Vogel, Hartmut Boesch, André Butz, Luis Guanter, Richard Siddans |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096881
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| Publikation (Nr.) |
 EGU/EGU2014-12411.pdf |
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| Zusammenfassung |
| In the frame of the EU Copernicus (formerly GMES) atmosphere service, future satellite
missions include Sentinel 5 Precursor (S5p, LEO), Sentinel 4 (S4, GEO) and Sentinel 5 (S5,
LEO). The aim of the S5 mission is to provide atmospheric observations of the troposphere at
several spectral ranges from the Ultraviolet Visible Near-Infrared (UVN) to the
shortwave infrared (SWIR), with spectra in the thermal infrared (TIR) provided by the
EUMETSAT EPS-SG IRS mission. Next to many trace gases in the UVN, the S5 will
monitor methane (CH4) and carbon monoxide (CO) in the SWIR region to assess
climate forcing and pollution at two wavelength ranges around 1.6μm and 2.3μm,
respectively.
Knowledge of aerosol induced radiative scattering is mandatory for accurate retrievals of
trace gas columns in the SWIR region. Common full-physics retrieval approaches for these
trace gases incorporate a spectral window in the near infrared (NIR) to account for aerosol
scattering by fitting the O2-A band around 0.76μm. Important additional information e.g. on
aerosol type could potentially be obtained from additionally including the O2-B band
around 0.69μm which should help to improve the greenhouse gas retrievals in the
SWIR.
We present a detailed investigation of the expected retrieval performance for CH4 and CO
from S5 observations with dedicated retrieval simulations experiments for different proposed
instrumental configurations for S5. A main focus of this investigation is on assessing the
added value of the O2-B band for characterizing aerosols related to the CH4 and CO
retrievals in the SWIR. The study also includes the effects of plant fluorescence
which is present in both O2 bands which adds to the complexity of the retrieval
problem. |
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