Leveraging Upcoming 355-nm Channels in Space Lidars for Cloud Science: Comparison With 532-nm and Case Studies from the IPRAL Ground-Based Lidar

Abstract : After ten years of CALIPSO lidar record, there are now no doubt that lidar is one of the most powerful tool to study cloud physics. Recent study (Chepfer et al. 2018) also shows that providing a long enough time series, lidar allows studying cloud trends. CALIPSO which works at 532 nm is at the end of life, but other lidar mission with 355-nm laser are planned or just launched: ADM-Aeolus, while not designed for clouds (only few vertical levels) could be very useful (among others) to make junction between CALIPSO and future other lidar missions, EarthCare, and other future lidar missions that are under study in the agencies and institutes. It is then necessary to study how continuity can be ensured between CALIPSO cloud products and upcoming space lidars that have different wavelengths, and what is the added value of this new wavelength for clouds. Here, the objective is then to study how leveraging upcoming 355-nm channels in space lidars for cloud science. To address this question, we use IPRAL lidar located in the SIRTA ground-based observatory (near Paris, France): IPRAL is a high-performance backscatter lidar that works at three wavelengths including 532- and 355-nm channels. It crosses atmosphere from ground to 20 km at a 15-m vertical resolution. We will present work on: (i) the creation of the equivalent of GOCCP CALIPSO cloud product from IPRAL 532-nm channel, and the adaptation of the method for the IPRAL 355-nm channel in order to make them as consistent as possible; (ii) comparison to CALIPSO for some collocated cases study in order to qualify and quantify the limits of a possible 532/355 continuity cloud product; (iii) new diagnostics relevant for cloud science based on the 355-nm IPRAL signal analysis.
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Contributor : Catherine Cardon <>
Submitted on : Sunday, January 13, 2019 - 5:42:09 PM
Last modification on : Friday, October 11, 2019 - 8:22:36 PM

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  • HAL Id : insu-01979667, version 1

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Marjolaine Chiriaco, Hélène Chepfer, Vincent Noël, Christophe Pietras. Leveraging Upcoming 355-nm Channels in Space Lidars for Cloud Science: Comparison With 532-nm and Case Studies from the IPRAL Ground-Based Lidar. ATMOS 2018, Nov 2018, Salzburg, Austria. ⟨insu-01979667⟩

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