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2020 Vol.55, Issue 2

Research Article

Types and Characteristics of the Foehn Phenomena over the Young-seo Region of Central Korea

영서지방 푄 현상의 유형과 특성

Byong Ik Park*a
박 병익*a
aFormer Professor, Department of Geography Education, Seoul National University
a전 서울대 지리교육과 교수
* Corresponding Author
30 April 2020. pp. 67-81
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Abstract

This study aims to investigate the characteristics of occurrence frequency and types of foehn phenomena over the Young-seo region in Korea using surface weather data and NCEP Climate Forecast System Reanalysis(CFSR, 4 times per day) for 24 years(1994-2017, Mar.-Aug.). There were 3 groups in the histogram of the temperature differences(TDGW) between Gangneung(St. No. 105) and Wonju(114) for the selected 124 cases of foehn phenomena. Almost all of the group of largest TDGW were occurred in 15KST(06Z). In this study foehn cases were classified into thermodynamical foehn(90%) and dynamic foehn(10%). The TDGW are larger in thermodynamic foehn than that of dynamic foehn. The largest TDGW case(2016. 4. 26. 06UTC) shows that the thermodynamic foehn happened by northeasterly at lowest level over the Taebaek Mountains. The TDGW increased as the temperature had decreased of the Eastern coastal region from lower northeasterly after forenoon time. From this results we know that the large TDGW comes from the warming from foehn phenomena, local heating of afternoon, and cooling of the Eastern coastal region from lower northeasterly.

Keywords
foehn
type of foehn
thermodynamic foehn
dynamic foehn
CFSR

본 연구는 최근 24년(1994~2017년)의 3~8월의 지상자료와 6시간 간격의 NCEP 기후예측시스템 재분석자료(CFSR)을 이용하여 영서지방의 푄 사례를 선정하고 이의 출현 특성, 푄 유형을 분류하고 그 특성을 살펴보았다. 선정된 124 사례의 영서지방 푄에 대해 조사한 강릉-원주 기온차의 출현빈도는 3개 그룹으로 분류할 수 있었고 이중 기온차가 큰 그룹(기온차 10.5℃ 이상)은 주로 오후 3시에 출현하였다. 영서지방의 푄은 주로 열역학적 푄으로 나타났고(약 90%) 일부 역학적 푄이 나타났다(약 10%). 열역학적 푄에서 강릉- 원주 기온차의 평균과 표준편차가 역학적 푄보다 더 컸다. 열역학적 푄에서 영동지방에 강수가 나타난 사례가 적었다(약 18%). 강릉-원주의 기온차가 가장 큰 사례(2016년 4월 26일 15시)에서는 하층의 북동풍에 의해 열역학적 푄이 나타났는데, 영동의 기온이 오전 이후 계속 하강하여 동서의 기온차가 매우 커졌다. 이상의 결과에서 강릉-원주의 기온차는 푄에 의한 가열 외에 영서지방의 국지 가열, 하층 북동풍에 의한 영동지방의 냉각 등과 관련되어 있다.

키워드
푄
푄의 유형
열역학적 푄
역학적 푄
CFSR
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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 : 55
  • No :2
  • Pages :67-81
  • Received Date : 2019-12-31
  • Revised Date : 2020-04-20
  • Accepted Date : 2020-04-21
  • DOI :https://doi.org/10.22776/kgs.2020.55.2.67
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