The Korean Journal of Quaternary Research (한국제4기학회지)

Korea Association For Quaternary Research (한국제4기학회)
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Effect of Arctic Oscillation and Sea Surface Temperature on Cold Surges over the Korean Peninsula

북극진동과 해수면온도가 한반도 한파에 미치는 영향

  • Sang-Hyun An (Department of Atmospheric Sciences, Kongju National University) ;
  • Da-Huin Chong (Department of Atmospheric Sciences, Kongju National University) ;
  • Sung-Min Yeo (Department of Atmospheric Sciences, Kongju National University) ;
  • El Noh (Department of Atmospheric Sciences, Kongju National University) ;
  • Joowan Kim (Department of Atmospheric Sciences, Kongju National University)
  • 안상현 (공주대학교 대기과학과) ;
  • 정다흰 (공주대학교 대기과학과) ;
  • 여성민 (공주대학교 대기과학과) ;
  • 노엘 (공주대학교 대기과학과) ;
  • 김주완 (공주대학교 대기과학과)
  • Received : 2021.10.04
  • Accepted : 2021.12.30
  • Published : 2021.12.31
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Abstract

The cold surge is an important extreme weather in East Asia during winter, and is largely affected by behavior of the Siberian high Arctic Oscillation, which represents undulation of large-scale pressure pattern in the Arctic region. Recent studies also revealed that the synoptic low pressure system developing in the eastern boundary of the Asian continent is sensitive to sea surface temperature (SST) and plays an important role in strengthening the cold advection over the Korean Peninsula during cold surges. In this study, we analyzed the Arctic Oscillation affecting the large-scale background of cold surge in East Asia, and the sea surface temperature in the coast of East Asia is examined focusing on its role on synoptic low-inducing cold advection. For the analysis, the days with the bottom 3% of the average daily temperature, measured at five surface stations in Korean Peninsula during 49 years (1969/70-2017/18), were used for the cold surge cases. During the negative phase of the Arctic Oscillation, a strong trough is observed over East Asia, and the inflow of cold air from the polar region is strengthened, which lead to frequent cold surges. In addition, anomalously high SST in the eastern coast of Asia increases sensible and latent heat release from the ocean, therefore, it enlarges the likelihood of synoptic low-inducing extreme cold surges.

한파는 겨울철 동아시아 지역의 대표적인 위험 기상 현상으로, 시베리아 고기압에 지배적인 영향을 받으며, 북극 지역의 기압장이 일정 주기로 강약을 되풀이하는 북극진동의 위상과도 밀접한 관련이 있다. 또한, 한반도-일본 동쪽 해상에서 발달하는 저기압은 해수면 온도에 민감하고 한파발생 시 한반도로 유입되는 한랭 이류의 강화에 중요한 역할을 한다. 본 연구에서는 겨울철 동아시아 한파의 대규모 배경장에 영향을 미치는 북극진동과 저기압과 관련된 급격한 기온 변화에 기여하는 동아시아 해안 지역의 해수면 온도를 분석하였다. 분석을 위해 49년(1969/70-2017/18) 동안 한반도 5개의 관측소에서 측정된 일 평균기온 중 하위 3%에 해당하는 날을 한파 사례로 선택하였다. 북극진동이 음의 위상일 때, 동아시아 지역에 위치한 기압골이 강해지며 극 지역의 한랭한 공기 유입이 강화되어 한파가 빈번하게 발생함을 확인하였다. 또한, 동아시아 주변의 해수면 온도가 평균보다 높은 경우 대기와 해양의 온도 및 습도 차이로 인해 현열 및 잠열 방출이 강화되며, 종관 저기압이 더 강하게 발달하여 기온이 빠르게 하강하는 극심한 한파가 발생할 가능성을 보였다.

Keywords

Acknowledgement

이 논문은 2021년 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구임(아북극-서태평양 기인 한반도 주변 고수온 현상 규명 및 예측시스템 구축)(20190344).

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