LIVAS: a 3-D multi-wavelength aerosol/cloud climatology based on CALIPSO and EARLINET
Author:
Amiridis V.ORCID, Marinou E.ORCID, Tsekeri A., Wandinger U., Schwarz A., Giannakaki E., Mamouri R.ORCID, Kokkalis P., Binietoglou I.ORCID, Solomos S., Herekakis T., Kazadzis S., Gerasopoulos E., Balis D.ORCID, Papayannis A.ORCID, Kontoes C., Kourtidis K.ORCID, Papagiannopoulos N.ORCID, Mona L., Pappalardo G., Le Rille O., Ansmann A.
Abstract
Abstract. We present LIVAS, a 3-dimentional multi-wavelength global aerosol and cloud optical climatology, optimized to be used for future space-based lidar end-to-end simulations of realistic atmospheric scenarios as well as retrieval algorithm testing activities. LIVAS database provides averaged profiles of aerosol optical properties for the potential space-borne laser operating wavelengths of 355, 532, 1064, 1570 and 2050 nm and of cloud optical properties at the wavelength of 532 nm. The global climatology is based on CALIPSO observations at 532 and 1064 nm and on aerosol-type-dependent spectral conversion factors for backscatter and extinction, derived from EARLINET ground-based measurements for the UV and scattering calculations for the IR wavelengths, using a combination of input data from AERONET, suitable aerosol models and recent literature. The required spectral conversion factors are calculated for each of the CALIPSO aerosol types and are applied to CALIPSO extinction and backscatter data correspondingly to the aerosol type retrieved by the CALIPSO aerosol classification scheme. A cloud climatology based on CALIPSO measurements at 532 nm is also provided, neglecting wavelength conversion due to approximately neutral scattering behavior of clouds along the spectral range of LIVAS. Averages of particle linear depolarization ratio profiles at 532 nm are provided as well. Finally, vertical distributions for a set of selected scenes of specific atmospheric phenomena (e.g., dust outbreaks, volcanic eruptions, wild fires, polar stratospheric clouds) are analyzed and spectrally converted so as to be used as case studies for space-borne lidar performance assessments. The final global climatology includes 4-year (1 January 2008–31 December 2011) time-averaged CALIPSO data on a uniform grid of 1×1 degree with the original high vertical resolution of CALIPSO in order to ensure realistic simulations of the atmospheric variability in lidar end-to-end simulations.
Funder
Directorate-General for Research and Innovation European Space Agency
Publisher
Copernicus GmbH
Reference65 articles.
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