Climatology of the Venus upper haze as measured by SOIR on board Venus Express

Details Climatology of the Venus upper haze as measured by SOIR on board Venus Express Climatology of the Venus upper haze as measured by SOIR on board Venus Express

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010eguga..12.8349w&link_type=abstract

EGU General Assembly 2010, held 2-7 May, 2010 in Vienna, Austria, p.8349

Physics

Optics

Scientific paper

We recently demonstrated the potential of the SPICAV/SOIR suite of instruments onboard the Venus Express spacecraft to characterize the aerosols in the mesosphere of Venus from a data set of three selected orbits [1]. The wavelength dependence of the continuum is primarily due to the extinction caused by the aerosol particles of the upper haze and is directly related to the effective particle radius of the particles. Recent advances are presented here, showing that careful selection of diffraction orders (i.e. spectral windows) during solar occultations performed by the SOIR instrument [2, 3] could allow using only the SOIR channel to obtain information on the particle's size. The continuum of the SOIR spectra was obtained with the ASIMAT retrieval code [4]. The possibility to use the SOIR channel alone, instead of in combination with the SPICAV channels is important as it offers a larger data set, although less informative in terms of microphysical properties. Therefore, temporal and geographical variations of the vertical profiles of the aerosol extinction were investigated for a particular diffraction order. This spectral window was measured in many solar occultations and over a period of 3 years leading to good spatial and temporal coverages. 1. Wilquet, V., et al., Preliminary characterization of the upper haze by SPICAV/SOIR solar occultation in UV to mid-IR onboard Venus Express. J. Geophysical Research, 2009. 114(E00B42): p. doi:10.1029/2008JE003186. 2. Nevejans, D., et al., Compact high-resolution space-borne echelle grating spectrometer with AOTF based on order sorting for the infrared domain from 2.2 to 4.3 micrometer. Applied Optics, 2006. 45(21): p. 5191-5206. 3. Mahieux, A., et al., In-Flight performance and calibration of SPICAV SOIR on board Venus Express. Applied Optics, 2008. 47(13): p. 2252-65. 4. Mahieux, A., et al., Venus atmospheric densities and temperature profiles retrieved from SOIR solar occultations on board Venus Express. J . Geophys . Res . 2010. (submitted).

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