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2020 Vol.25, Issue 3

Article

Effects of Typhoon and Mesoscale Eddy on Generation and Distribution of Near-Inertial Wave Energy in the East Sea

동해에서 태풍과 중규모 소용돌이가 준관성주기파 에너지 생성과 분포에 미치는 영향

HAJIN SONG1
,
CHANHYUNG JEON2
,
JEONG-YEOB CHAE1
,
EUN-JOO LEE1
,
KANG-NYEONG LEE1
,
TAKAYAMA KATSUMI3
,
YOUNGSEOK CHOI14
,
AND JAE-HUN PARK5
송 하진1
,
전 찬형2
,
채 정엽1
,
이 은주1
,
이 강녕1
,
Takayama Katsumi3
,
최 영석14
,
박 재훈5
1Graduate Student, Department of Marine Science and Biological Engineering, Inha University
2Postdoctoral Associate, Department of Mechanical Engineering, Massachusetts Institute of Technology
3Post-doctoral Fellow, Research Institute for Applied Mechanics, Kyushu University
4Engineer, Department of Ocean Information Analysis, Geosystem Research Corporation
5Professor, Department of Ocean Sciences, Inha University
1인하대학교 해양과학‧생물공학과 대학원생
2매사추세츠 공과대학 기계공학과 박사후연구원
3큐슈대학교 응용역학연구소 학술연구원
4(주)지오시스템리서치 해양정보분석부 전임연구원
5인하대학교 해양과학과 교수
* Corresponding Author
31 August 2020. pp. 55-66
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Abstract

준관성주기파(NIW)는 주로 바람에 의해 생성되며, 해양 연직혼합에 중요한 요소이다. 태풍의 빠른 풍속과 이동경로에 따른 풍향 변화는 NIW 생성에 충분한 조건을 제공한다. 본 연구에서는 동해 실시간 해황예보모형 출력자료를 이용하여 태풍의 영향으로 인한 NIW의 생성과 분포 그리고 동해 중규모 소용돌이가 NIW의 심층 전파에 주는 영향에 대해 검토하였다. 이용한 출력자료 기간은 2013년부터 2017년까지 총 5개년이며, 이 기간 중 동해에 강한 NIW에너지를 만든 3개 태풍(할롱, 고니, 차바)에 초점을 맞추었다. 태풍에 의한 NIW 변동을 검토하기 위하여 강제력으로 작용하는 태풍의 바람에너지유입(W¯I)과 함께 NIW 에너지의 지표인 혼합층 및 심층 수평운동에너지(HKE¯MLD,HKE¯DEEP)를 계산하였다. HKE¯MLD는 W¯I와 밀접한 관련을 보였으며 태풍 경로의 오른편에서 강하게 나타났다. HKE¯DEEP는 주로 동해 남부에서 패치형태로 강하게 나타났으며, 음의 상대 소용돌이도를 가지는 난수성 소용돌이와의 상관성이 확인되었다. NIW에너지에 태풍이 주는 영향을 확인하기 위해, 태풍이 없는 여름철과 12월의 에너지와 상호 비교하였다. 그 결과, 태풍에 의한 HKE¯MLD는 태풍이 없는 여름에 비해 2.5~5.7배, NIW가 가장 큰 12월 평균대비 0.4~1.0배였고, 태풍에 의한 HKE¯DEEP는 태풍이 없는 여름대비 1.2~1.6배, 12월 평균대비 0.8~1.0배로 태풍에 의한 NIW가 혼합층과 심층의 해양 연직혼합 모두에 상당한 영향을 줄 수 있음을 확인하였다.

Near-inertial waves (NIW) which are primarily generated by wind can contribute to vertical mixing in the ocean. The energetic NIW can be generated by typhoon due to its strong wind and preferable wind direction changes especially on the right-hand side of the typhoon. Here we investigate the generation and distribution of NIW using the output of a real-time ocean forecasting system. Five-year model outputs during 2013-2017 are analyzed with a focus on cases of energetic NIW generation by the passage of three typhoons (Halong, Goni, and Chaba) over the East Sea. Calculations of wind energy input (W¯I), and horizontal kinetic energy in the mixed layer (HKE¯MLD) reveal that the spatial distribution of HKE¯MLD, which is strengthened at the right-hand side of typhoon tracks, is closely related with W¯I. Horizontal kinetic energy in the deep layer (HKE¯DEEP) shows patch-shaped distribution mainly located at the southern side of the East Sea. Spatial distribution of HKE¯DEEP shows a close relationship with negative relative vorticity regions caused by warm eddies in the upper layer. Monthly-mean HKE¯MLD and HKE¯DEEP during a typhoon passing over the East Sea shows about 2.5-5.7 times and 1.2-1.6 times larger values than those during summer with no typhoons, respectively. In addition, their magnitudes are respectively about 0.4-1.0 and 0.8-1.0 times from those during winter, suggesting that the typhoon-induced NIW can provide a significant energy to enhance vertical mixing at both the mixed and deep layers during summer.

Keywords
Near-inertial waves
Typhoon
Mesoscale eddy
East Sea

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Information
  • Publisher :The Korean Society of Oceanography
  • Publisher(Ko) :한국해양학회
  • Journal Title :The Sea Journal of the Korean Society of Oceanography
  • Journal Title(Ko) :한국해양학회지 바다
  • Volume : 25
  • No :3
  • Pages :55-66
  • Received Date : 2020-05-19
  • Revised Date : 2020-07-21
  • Accepted Date : 2020-07-24
  • DOI :https://doi.org/10.7850/jkso.2020.25.3.055
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