A142-0007
Microphysics of Winter Precipitation Linked with Secondary Ice During ICE-POP 2018

Monday, 14 December 2020
Poster
Bo-Young Ye1, Kwonil Kim2, Wonbae Bang1, Alexis Berne3, Stephen Joseph Munchak4 and Gyuwon Lee1,2, (1)Kyungpook National University, Center for Atmospheric REmote sensing (CARE), Daegu, South Korea, (2)Kyungpook National University, Department of Astronomy and Atmospheric Sciences, Daegu, South Korea, (3)Swiss Federal Institute of Technology Lausanne, Environmental Remote Sensing Laboratory, Lausanne, Switzerland, (4)NASA Goddard Space Flight Center, Greenbelt, United States
Abstract:
Secondary ice production (SIP) is an important process that rapidly enhances the number concentration of the ice crystals. Initial investigations into SIP in observations based on remote sensing showed that ice splintering is associated with the riming process known as the Hallett-Mossop (H-M) process in the temperature range from −8℃ to −3℃. Recently, polarimetric radar signatures play an important role in explaining of characteristics of winter precipitation, especially, interpretation of dominant growth processes of ice crystals. Ardrić et al. (2013) reported the enhanced differential reflectivity (ZDR) and specific differential phase (KDP) layers located outside the temperature range from −8℃ to −3℃ are related to SIP not the H-M process.

In this study, we analyze microphysical processes of a winter storm case that is observed coincidence between enhancement layers of polarimetric variables and bimodal feature in radar power spectra linked with SIP. The analysis is based on measurements carried out by ground-based observations during ICE-POP 2018 (International Collaborative Experiments for Pyeongchang 2018 Olympic & Paralympic winter games) project. Spectra data obtained from the W-band Doppler cloud profiler (WProf) installed at Mayhills supersite are used to find the location of the second peak associated with the SIP. We also utilized columnar vertical profiles (CVP, Murphy 2018) of dual-polarization parameters from dual-frequency dual-polarized Doppler radar (D3R) over the MHS site.

During a winter precipitation case on 7-8 March 2018, the ZDR and KDP maxima and cross-correlation coefficient minimum mostly are located in pronounced bimodality layer at 4 km AGL (about −15℃). We surmise that these signatures of dual-polarimetric variables are caused by very many small ice crystals produced by SIP, not the H-M process.

Acknowledgments: This work was funded by the Korea Meteorological Administration Research and Development Program under Grant KMI2018-06810. The authors greatly appreciate the participants in the World Weather Research Programme Research Development Project and Forecast Demonstration Project, International Collaborative Experiments for Pyeongchang 2018 Olympic and Paralympic winter games (ICE-POP2018) hosted by Korea Meteorological Administration.

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