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| excursions:epfl_research_stay [2026/08/19 19:38] – ayush | excursions:epfl_research_stay [2026/09/16 05:24] (current) – ayush | ||
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| While the agreement between observations and the reconstructions is strikingly similar, the retrieval of particle properties from radar Doppler spectra is ill-posed and the retrieved properties might not be correct even though their forward simulations look promising. Therefore, the retrieval needs to be validated with e.g. in-situ measurements. Such observations are not available for the TRIPEx-pol campaign. We are currently looking into data collected during the BAECC campaign (Petäjä et al. 2016), which provides triple-frequency Doppler spectra alongside in-situ observations of ice particles close to the ground. Further, in a next step, the added value a third frequency provides for retrieving particle properties will be tested. Also, the best combinations of two frequencies (e.g. X-,W-band vs. Ka-,W-band vs. X-, Ka-Band) will be tested to provide a recommendation of dual-frequency setups if only two frequencies are feasible. In the far future, the possibility to move from a fixed description of the PSD (i.e. through assuming a gamma distribution) towards a binned PSD might be explored, to improve the retrieval in cases of multi-modal spectra. | While the agreement between observations and the reconstructions is strikingly similar, the retrieval of particle properties from radar Doppler spectra is ill-posed and the retrieved properties might not be correct even though their forward simulations look promising. Therefore, the retrieval needs to be validated with e.g. in-situ measurements. Such observations are not available for the TRIPEx-pol campaign. We are currently looking into data collected during the BAECC campaign (Petäjä et al. 2016), which provides triple-frequency Doppler spectra alongside in-situ observations of ice particles close to the ground. Further, in a next step, the added value a third frequency provides for retrieving particle properties will be tested. Also, the best combinations of two frequencies (e.g. X-,W-band vs. Ka-,W-band vs. X-, Ka-Band) will be tested to provide a recommendation of dual-frequency setups if only two frequencies are feasible. In the far future, the possibility to move from a fixed description of the PSD (i.e. through assuming a gamma distribution) towards a binned PSD might be explored, to improve the retrieval in cases of multi-modal spectra. | ||
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