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Cloud filter for CO retrieval from IMG infrared spectra using ECMWF temperatures and POLDER cloud data
Author(s) -
HadjiLazaro Juliette,
Clerbaux Cathy,
Couvert Pierre,
Chazette Patrick,
Boonne Cathy
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012342
Subject(s) - radiance , environmental science , remote sensing , nadir , cloud cover , cloud computing , meteorology , filter (signal processing) , atmospheric infrared sounder , spectral line , atmospheric sciences , geology , water vapor , satellite , physics , computer science , computer vision , operating system , astronomy
Infrared atmospheric measurements provided by space nadir looking remote sensors are affected by the presence of clouds. To obtain cloud‐free CO global distributions from the radiance spectra measured by the IMG instrument, we have developed a simple method of spectra selection using skin temperatures provided by the ECMWF model. Information on the cloud cover was provided by the cloud data of the POLDER instrument which flew aboard the same platform as IMG. We show that a filter based on skin temperature, with thresholds of 8 K over sea and 15.3 K over land, allows to remove most of the cloudy cases.