Determination of ice water content (IWC) in tropical convective clouds from X-band dual-polarization airborne radar

Nguyen, Cuong M.; Wolde, Mengistu; Korolev, Alexei

This paper presents a methodology for ice water content (IWC) retrieval from a dual-polarization side-looking X-band airborne radar. Measured IWC from aircraft in situ probes is weighted by a function of the radar differential reflectivity (Zdr) to reduce the effects of ice crystal shape and orientation on the variation in IWC – specific differential phase (Kdp) joint distribution. A theoretical study indicates that the proposed method, which does not require a knowledge of the particle size distribution (PSD) and number density of ice crystals, is suitable for high-ice-water-content (HIWC) regions in tropical convective clouds. Using datasets collected during the High Altitude Ice Crystals – High Ice Water Content (HAIC-HIWC) international field campaign in Cayenne, French Guiana (2015), it is shown that the proposed method improves the estimation bias by 35 % and increases the correlation by 4 % on average, compared to the method using specific differential phase (Kdp) alone.

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Nguyen, Cuong M. / Wolde, Mengistu / Korolev, Alexei: Determination of ice water content (IWC) in tropical convective clouds from X-band dual-polarization airborne radar. 2019. Copernicus Publications.

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