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| Titel |
Temporal co-registration for TROPOMI cloud clearing |
| VerfasserIn |
I. Genkova, J. Robaidek, R. Roebling, M. Sneep, P. Veefkind |
| 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 ; 5, no. 3 ; Nr. 5, no. 3 (2012-03-15), S.595-602 |
| Datensatznummer |
250002632
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| Publikation (Nr.) |
 copernicus.org/amt-5-595-2012.pdf |
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| Zusammenfassung |
| The TROPOspheric Monitoring Instrument (TROPOMI) is anticipated to provide
high-quality and timely global atmospheric composition information through
observations of atmospheric constituents such as ozone, nitrogen dioxide,
sulfur dioxide, carbon monoxide, methane, formaldehyde and aerosol
properties. The methane and the aerosol retrievals require very precise
cloud clearing, which is difficult to achieve at the TROPOMI spatial
resolution (7 by 7 km) and without thermal IR measurements. The TROPOMI
carrier – the Sentinel 5 Precursor (S5P), does not include a cloud imager,
thus it is planned to fly the S5P mission in a constellation with an
instrument yielding an accurate cloud mask. The cloud imagery data will be
provided by the US NPOESS Preparatory Project (NPP) mission, which will have
the Visible Infrared Imager Radiometer Suite (VIIRS) on board (Scalione,
2004). This paper investigates the temporal co-registration requirements for
suitable time differences between the VIIRS measurements of clouds and the
TROPOMI methane and aerosol measurements, so that the former could be used
for cloud clearing. The temporal co-registration is studied using Meteosat
Second Generation (MSG) Spinning Enhanced Visible and Infrared Imager
(SEVIRI) data with 15 min temporal resolution (Veefkind, 2008b), and with
data from the Geostationary Operational Environmental Satellite – 10
(GOES-10) having 1 min temporal resolution. The aim is to understand and
assess the relation between the amount of allowed cloud contamination and
the required time difference between the two satellites' overflights.
Quantitative analysis shows that a time difference of approximately 5 min is sufficient (in most conditions) to use the cloud information from
the first instrument for cloud clearing in the retrievals using data from
the second instrument. In recent years the A-train constellation
demonstrated the benefit of flying satellites in formation. Therefore this
study's findings will be useful for designing future Low Earth Orbit (LEO)
satellite constellations. |
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