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Research Article

Changing Periodicity of the Winter Temperature Variability in the Korean Peninsula

한반도 겨울철 기온 변동의 주기성 변화

Sanghyeon Yuna
,
Namyoung Kanga*
윤 상현a
,
강 남영a*
aPh.D. Student, Department of Geography, Kyungpook National University
aAssoc. Professor, Department of Geography, Kyungpook National University
a경북대학교 지리학과 박사과정
a경북대학교 지리학과 부교수
*Corresponding Author
31 August 2024. pp. 461-470
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Abstract

By using wavelet transform, this study investigates the periodicity of winter temperature variability in the Korean Peninsula reflecting recent climate trends. The winter temperatures in the Korean Peninsula exhibit large fluctuations depending on the variability of the Arctic Oscillation and the Siberian High. We examine the periodicity of the winter temperatures in the Korean Peninsula and how these periods respond to ENSO and global warming. It is confirmed that the variability of winter temperatures shows different responses depending on the ENSO status. In an El Niño environment, the wavelet power shows that the periodicity is likely to be longer than of 10 days, whereas the La Niña environment exhibits the shoter periodicity. Furthermore, a warmer environment tends to extend the periodicity during the study period (1991~2020). When the environmental conditions are combined with ENSO and global warming, the significant decreases in the shorter-term periodicity of 5 to 6 days are found under the warm La Niña conditions.

Keywords
Winter temperature
Korea Peninsula
periodicity
wavelet transform

본 연구는 최근 기후 평년 기간(1991~2020년) 동안의 지상 기온 자료에 대한 웨이블릿 변환 분석을 수행함으로써 한반도 겨울철(12~2월) 기온 변동의 주기성을 분석하고 이러한 주기가 엘니뇨-남방진동(El Niño-Southern Oscillation, ENSO) 및 지구온난화에 어떻게 반응 하는지 진단하였다. 결과적으로 ENSO에 따른 겨울철 기온 변동은 엘니뇨와 라니냐 두 시기에 따라 상이하게 나타나며, 엘니뇨 시기에 10일 이상의 장주기가 우세한 반면 라니냐 시기에는 1주일의 경험적인 주기를 포함하는 10일 이내 주기의 변동이 우세한 것으로 파악되었다. 또한 온난해지는 최근 기후에서 한반도 겨울철 기온의 주기는 과거에 비해 길어지는 것으로 나타났다. ENSO와 지구 온난 정도가 조합하여 보다 세부적인 환경에 대해 그 반응을 분석한 결과, 온난한 라니냐 환경에서 겨울철 기온 변동 주기성은 특히 상대적으로 짧은 5-6일 구간에서 유의하게 감소하는 것으로 나타났다.

키워드
겨울철 기온
한반도
주기성
웨이블릿 변환
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Information
  • Publisher :The Korean Geographical Society
  • Publisher(Ko) :대한지리학회
  • Journal Title :Journal of the Korean Geographical Society
  • Journal Title(Ko) :대한지리학회지
  • Volume : 59
  • No :4
  • Pages :461-470
  • Received Date : 2024-05-10
  • Revised Date : 2024-07-04
  • Accepted Date : 2024-07-05
  • DOI :https://doi.org/10.22776/kgs.2024.59.4.461
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