겨울철 북서 태평양에서 발생하는 고위도 블로킹과 중앙 태평양 기압능이한반도 한파에 미치는 영향 연구
A Study of the Blocking and Ridge over the Western North Pacific in Winter and its Impact on Cold Surge on the Korean Peninsula
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초록
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.
Abstract
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.
참고문헌 (22)
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