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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-62
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-62
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 18 Mar 2019

Research article | 18 Mar 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Determination of Ice Water Content (IWC) in tropical convective clouds from X-band dual-polarization airborne radar

Cuong M. Nguyen1, Mengistu Wolde1, and Alexei Korolev2 Cuong M. Nguyen et al.
  • 1Flight Research Laboratory, National Research Council Canada, Ottawa, K1A 0R6, Canada
  • 2Environment and Climate Change Canada, Toronto, J8X 4C6, Canada

Abstract. 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 of 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 Crystal – 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 15 % on average and reduces the root mean squared difference by 6 %, compared to the method using specific differential phase (Kdp) alone.

Cuong M. Nguyen et al.
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Short summary
This paper presents a method using Kdp and Zdr from a side-looking X-band dual-polarization airborne radar to improve high ice water content (HIWC) (up to 3.5 g m−3) retrieval in tropical mesoscale convective systems (MCS). The proposed method shows an improvement of 15 % in estimation bias compared to the method using Kdp alone. Accurate detection and estimation of HIWC in MCSs are critical for reducing hazards caused by the ingestion of ice particles into the engines of commercial aircraft.
This paper presents a method using Kdp and Zdr from a side-looking X-band dual-polarization...
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