Preprints
https://doi.org/10.5194/acp-2021-128
https://doi.org/10.5194/acp-2021-128

  12 Mar 2021

12 Mar 2021

Review status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Impact of wind pattern and complex topography on snow microphysics during ICE-POP 2018

Kwonil Kim1, Wonbae Bang1, Eun-Chul Chang2, Francisco J. Tapiador3, Chia-Lun Tsai1, Eunsil Jung4, and Gyuwon Lee1 Kwonil Kim et al.
  • 1Department of Astronomy and Atmospheric Sciences, Center for Atmospheric REmote sensing (CARE), Kyungpook National University, Daegu, Republic of Korea
  • 2Department of Atmospheric Sciences, Kongju National University, Gongju, Republic of Korea
  • 3Earth and Space Sciences Research Group, Institute of Environmental Sciences, University of Castilla-La Mancha, Spain
  • 4Department of Advanced Science and Technology Convergence, Kyungpook National University, Sangju, Republic of Korea

Abstract. Snowfall in north-eastern part of South Korea is the result of complex snowfall mechanisms due to a highly-contrasting terrain combined with nearby warm waters and three synoptic pressure patterns. All these factors together create unique combinations, whose disentangling can provide new insights into the microphysics of snow in the planet. This study focuses on the impact of wind flow and topography on the microphysics drawing of twenty snowfall events during the ICE-POP 2018 (International Collaborative Experiment for Pyeongchang 2018 Olympic and Paralympic winter games) field campaign in the Gangwon region. The vertical structure of precipitation and size distribution characteristics are investigated with collocated MRR (Micro Rain Radar) and PARSIVEL (PARticle SIze VELocity) disdrometers installed across the mountain range. The results indicate that wind shear and embedded turbulence were the cause of the riming process dominating the mountainous region. As the strength of these processes weaken from the mountainous region to the coastal region, riming became less significant and gave way to aggregation. This study specifically analyzes the microphysical characteristics under three major synoptic patterns: air-sea interaction, cold low, and warm low. Air–sea interaction pattern is characterized by more frequent snowfall and vertically deeper precipitation systems in the windward side, resulting in significant aggregation in the coastal region, with riming featuring as a primary growth mechanism in both mountainous and coastal regions. The cold low pattern is characterized by a higher snowfall rate and vertically deep systems in mountainous region, with the precipitation system becoming shallower in the coastal region and strong turbulence being found in the layer below 2 km in the mountainous upstream region (linked with dominant aggregation). The warm low pattern features the deepest system: precipitation here is enhanced by the seeder–feeder mechanism with two different precipitation systems divided by the transition zone (easterly below and westerly above). Overall, it is found that strong shear and turbulence in the transition zone is a likely reason for the dominant riming process in mountainous region, with aggregation being important in both mountainous and coastal regions.

Kwonil Kim et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-128', Anonymous Referee #1, 13 Apr 2021
  • RC2: 'Comment on acp-2021-128', Anonymous Referee #2, 12 May 2021
  • AC1: 'Reply to both reviewers', GyuWon Lee, 23 Jun 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-128', Anonymous Referee #1, 13 Apr 2021
  • RC2: 'Comment on acp-2021-128', Anonymous Referee #2, 12 May 2021
  • AC1: 'Reply to both reviewers', GyuWon Lee, 23 Jun 2021

Kwonil Kim et al.

Kwonil Kim et al.

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Short summary
This study analyzed the microphysical characteristics of snow in complex terrain and nearby ocean according to topography and wind pattern during the ICE-POP 2018. The observations from collocated vertically pointing radars and disdrometers indicate the riming in the mountainous region is likely caused by a strong shear and turbulence. The different behaviors of aggregation and riming were found by three different synoptic patterns (air-sea interaction, cold low, and warm low).
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