Atmosphere (대기)

Korean Meteorological Society (한국기상학회)
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Analysis of Spatial Variability of Surface Wind during the Gangwon Yeongdong Wind Experiments (G-WEX) in 2020

2020 강원영동 강풍 관측에서 지상 바람의 공간 변동성 분석

  • Kim, Yu-Jeong (High Impact Weather Research Department, National Institute of Meteorological Sciences) ;
  • Kwon, Tae-Yong (Department of Atmospheric and Environmental Sciences, Gangeneung-Wonju National University)
  • 김유정 (국립기상과학원 재해기상연구부) ;
  • 권태영 (강릉원주대학교 대기환경과학과)
  • Received : 2021.05.13
  • Accepted : 2021.07.27
  • Published : 2021.11.30
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Abstract

The recent largest forest fire in the Yeongdong region, Goseung/Okgae fires of 2019 occurred during YangGang wind event. The wind can be locally gusty and extremely dry, particularly in the complex terrain of Yeongdong. These winds can cause and/or rapidly spread wildfires, the threat of which is serious during the dry spring season. This study examines the spatial variability of the surface wind and its coupling with the upper atmospheric wind using the data during the IOP of the Gangwon Yeongdong Wind Experiments (G-WEX) conducted in 2020 and the data during YangGang wind event on 4~5 April 2019. In the case of IOPs, strong wind at the surface with a constant wind direction appears in the mountain area, and weak wind with large variability in wind direction appears from foothill to the coast in the vicinity of Gangneung region. However, in the 2019 event, strong wind at the surface with a constant wind direction appears in the entire region from the mountain to the coast, even with the stronger wind in the coast than in some part of the mountain area. The characteristics of the upper atmospheric wind related with the spatial distribution of surface wind show that during IOPs of G-WEX, a strong downdraft exists near the mountaintop in the level of about 1 to 4 km. However, in the 2019 event a strong downdraft is reinforced, when its location moves toward the coast and descends close to the ground. These downdrafts are generated by the breaking of mountain waves.

Keywords

Acknowledgement

이 연구는 국립기상과학원 재해기상연구부 용역사업 '강원영동 동풍·강풍의 특화된 관측·예보기술 개발 II(KMA2018-00123)'의 지원으로 수행되었습니다.

References

  1. Brinkmann, W. A. R., 1974: Strong downslope winds at Boulder, Colorado. Mon. Wea. Rev., 102, 592-602. https://doi.org/10.1175/1520-0493(1974)102<0592:SDWABC>2.0.CO;2
  2. Carvalho, L., and Coauthors, 2020: The sundowner winds experiment (SWEX) pilot study: Understanding downslope windstorms in the Santa Ynez Mountains, Santa Barbara, California. Mon. Wea. Rev., 148, 1519-1539, doi:10.1175/MWR-D-19-0207.1.
  3. Cheang, E.-H., C.-J. Moon, M.-S. Jeong, K.-P. Jo, and G.-Y. Park, 2010: The study for calculating the geometric average height of Deacon equation suitable to the domestic wind correction methodology. J. Korean Sol. Energy Soc., 30, 9-14 (in Korean with English abstract).
  4. Cho, Y.-J., T.-Y. Kwon, and B.-C. Choi, 2015: Characteristics of meteorological variables in the leeward side associated with the downslope windstorm over the Yeongdong region. J. Korean Earth Sci. Soc., 36, 315-329, doi:10.5467/JKESS.2015.36.4.315 (in Korean with English abstract).
  5. Clark, T. L., and W. R. Peltier, 1984: Critical level reflection and the resonant growth of nonlinear mountain waves. J. Atmos. Sci., 41, 3122-3134. https://doi.org/10.1175/1520-0469(1984)041<3122:CLRATR>2.0.CO;2
  6. Durran, D. R., 1986: Another look at downslope windstorms. Part I: The development of analogs to supercritical flow in an infinitely deep, continuously stratified fluid. J. Atmos. Sci., 43, 2527-2543. https://doi.org/10.1175/1520-0469(1986)043<2527:ALADWP>2.0.CO;2
  7. Jang, W., and H.-Y. Chun, 2008: Severe downslope windstorms of Gangneung in the springtime. Atmosphere, 18, 207-224 (in Korean with English abstract).
  8. Jang, W., and H.-Y. Chun, 2010: A numerical study on severe downslope windstorms occurred on 5 April 2005 at Gangneung and Yangyang, Korea. Asia-Pac. J. Atmos. Sci., 46, 155-172, doi:10.1007/s13143-010-0015-2.
  9. Kim, J.-H., and I.-U. Chung, 2006: Study on mechanisms and orographic effect for the springtime downslope windstorm over the Yeongdong region. Atmosphere, 16, 67-83 (in Korean with English abstract).
  10. Kim, Y.-S., and S.-G. Hong, 1996: A study of quasi-Foehn in the Youngdong-district in late spring of early summer. J. Korean Meteor. Soc., 32, 593-600 (in Korean with English abstract).
  11. Klemp, J. B., and D. K. Lilly, 1975: The dynamics of wave-induced downslope winds. J. Atmos. Sci., 32, 320-339. https://doi.org/10.1175/1520-0469(1975)032<0320:TDOWID>2.0.CO;2
  12. Lee, J. G., 2003: A numerical study of the orographic effect of the Taebak mountains on the increase of the downslope wind speed near Gangnung area. J. Environ. Sci., 12, 1245-1254 (in Korean with English abstract).
  13. Long, R. R., 1953: Some aspects of the flow of stratified fluids: I. A theoretical investigation. Tellus, 5, 42-58. https://doi.org/10.1111/j.2153-3490.1953.tb01035.x
  14. Miller, P. P., and D. R. Durran, 1991: On the sensitivity of downslope windstorms to the asymmetry of the mountain profile. J. Atmos. Sci., 48, 1457-1473. https://doi.org/10.1175/1520-0469(1991)048<1457:OTSODW>2.0.CO;2
  15. Queney, P., G. A. Corby, N. Gerbier, H. Koschmieder, and J. Zierep, 1960: The airflow over mountains. WMO Tech. Note 34, 135 pp.
  16. Stull, R. B., 1988: An Introduction to Boundary Layer Meteorology. Kluwer Academic Publishers, 666 pp.