A142-0004
Impact of wind pattern and complex topography on microphysics of winter precipitation during ICE-POP 2018
Monday, 14 December 2020
Poster
Kwonil Kim1, Wonbae Bang2, Eun-Chul Chang3, Eunsil Jung4 and Gyuwon Lee1, (1)Kyungpook National University, Department of Astronomy and Atmospheric Sciences, Daegu, South Korea, (2)Kyungpook National University, Center for Atmospheric REmote sensing (CARE), Daegu, South Korea, (3)Kongju National University, Department of Atmospheric Science, Gongju, South Korea, (4)Kyungpook National University, School of Disaster Prevention and Environmental Engineering, Daegu, South Korea
Abstract:
The snowfall mechanism in the eastern coastal region of the Korean peninsula is difficult to understand due to various synoptic patterns, complex topography, and the effect by adjacent ocean which is similar to lake effect. It is necessary to understand the mechanism how winter precipitation is developed in this region to improve forecasting skills. A field campaign named ICE-POP 2018 (International Collaborative Experiments for Pyeongchang 2018 Olympic & Paralympic winter games) was conducted during the 2017-2018 winter including 2016-2017 winter to study the mechanism based on intensive observations. During the campaign, precipitation systems were observed with a comprehensive observational network in this region, particularly with dense MRR-2 and PARSIVEL network. MRR-2s (PARSIVELs) were deployed at 11 (20) sites with identical observational strategies such as spatial resolution. We could monitor the vertical development and evolution of precipitation system as they passed over the terrain with dense microphysical network.
We have selected 5 sites that are aligned in a line crossing the topography, which is parallel to the direction of mean wind flow when precipitation occurs. The precipitation systems are classified into the three categories with synoptic patterns (air-sea interaction, cold Low and warm Low). The vertical structures according to topography are compared by CFAD analysis. Size distribution characteristics at the ground are analyzed. The riming signature caused by directional wind shear is noticeable at the mountainous sites throughout the campaign, particularly in warm Low cases. In air-sea interaction cases, it is found that orographic updraft may relates to secondary frequency peaks of reflectivity and Doppler velocity at mountainous sites. In cold Low cases, a sharp decrease of reflectivity throughout the heights compared to mountainous region appears in the coastal region. We will present the results in relation to the dynamical characteristics.
Acknowledgment
This work was funded by the Korea Meteorological Administration Research and Development Program under Grant KMI2018-06810.
