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조건희,장은철 한국지구과학회 2017 한국지구과학회지 Vol.38 No.3
A typical snowfall pattern occurs over the east coastal region of the Korean Peninsula, known as the Yeongdong region. The precipitation over the Yeongdong region is influenced by the cold and dry northeasterly wind which advects over warm and moist sea surface of the East Sea of Korea. This study reveals the influence of large-scale factors, affecting local to remote areas, on the mesoscale snowfall system over the Yeongdong region. The National Centers for Environmental Prediction-Department of Energy reanalysis dataset, Extended Reconstructed sea surface temperature, and observed snowfall data are analyzed to reveal the relationship between February snowfall and large-scale factors from 1981 to 2014. The Yeongdong snowfall is associated with the sea level pressure patterns over the Gaema Plateau and North Pacific near the Bering Sea, which is remotely associated to the sea surface temperature (SST) variability over the North Pacific. It is presented that the relationship between the Yeongdong snowfall and large-scale factors is strengthened after 1999 when the central north Pacific has warm anomalous SST. These enhanced relationships explain the atmospheric patterns of recent strong snowfall years (2010, 2011, and 2014). It is suggested that the newly defined index in this study based on related SST variability can be used for a seasonal predictor of the Yeongdong snowfall with 2-month leading.
겨울철 북서 태평양에서 발생하는 고위도 블로킹과 중앙 태평양 기압능이한반도 한파에 미치는 영향 연구
조건희,이은희,김백민 한국기상학회 2023 대기 Vol.33 No.1
Blocking refers to a class of weather phenomena appearing in the mid and high latitudes,whose characteristics are blocked airflow of persistence. Frequently found over thePacific and Atlantic regions of the Northern Hemisphere, blocking affects severe weather in thesurrounding areas with different mechanisms depending on the type of blocking patterns. Alongwith lots of studies about persistent weather extremes focusing on the specific types of blocking,a new categorization using Rossby wave breaking has emerged. This study aims to applythis concept to the classification of blockings over the Pacific and examine how different wavebreakings specify the associated cold weather in the Korean peninsula. At the same time, weinvestigate a strongly developing ridge around the Pacific by designing a new detection algorithm,where a reversal method is modified to distinguish ridge-type blocking patterns. As result,Kamchatka blocking (KB) and strong ridge over the Central Pacific are observed the most frequentlyduring 20 years (2001~2020) of the studied period, and anomalous low pressures withcold air over the Korean Peninsula are accompanied by blocking events. When it considers theRossby wave breaking, cyclonic wave-breaking is dominant in KB, which generates low-pressureanomalies over the Korean Peninsula. However, KB with anticyclone wave breakingappears with the high-pressure anomalies over the Korean Peninsula and it generates the warmtemperature anomaly. Lastly, the low-pressure anomalies are also generated by the strong ridgeover the Central Pacific, which persists for approximately three days and give a significantimpact on cold surge on the Korean Peninsula.