Journal
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Volume 119, Issue 14, Pages 8899-8907Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JD021472
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Aerosol extinction profiles from a climatology of CALIPSO measurements are analyzed with respect to their representation by truncated sums of up to three lognormal functions. Discussed are results for the climatological mean and a realistic profile, which is constructed from the climatological mean and its standard deviation. The realistic profile shows, in general, a more feature- rich structure and is used as proxy for actual measurements. It was found that a single lognormal mode is on global scale able to explain 59% of the vertical profile, while a sum of two modes is able to explain 74%. Including a third lognormal mode leads only to a minor improvement to 79%. The strong regional and weaker seasonal dependency of the reconstruction accuracy with respect to the number of used lognormal modes is presented and discussed in detail. These findings have implications for the design of future operational aerosol height retrievals for upcoming instruments such as Tropospheric Monitoring Instrument on board European Space Agency's Sentinel 5 precursor or Sentinel 4.
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