Asia-Pacific Journal of Atmospheric Sciences

Korean Meteorological Society (한국기상학회)
권호 표지

A Numerical Study of Yeongdong Heavy Snowfall Events Associated with Easterly

동풍계열의 기류와 관련된 영동대설 사례에 대한 수치모의 연구

Lee, Jae Gyoo;Lee, Jae Sung
이재규;이재성

  • Published : 20030800
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Abstract

The accumulated precipitation distributions of case A (a heavy snowfall event occurred on 14-16 January 1998) and case B (a heavy snowfall event occurred on 3 February 1997) differed from each other, particularly in the Yeongdong mountain area and Yeongdong coastal area, even though the two cases showed similar easterly flow pattern on the surface weather charts. Numerical simulations for these cases have been done to study mesoscale structure and to find out the main reasons for the large difference in snowfall amount between the Yeongdong mountain area and the Yeongdong coastal area. The simulations showed that the main reasons for the major difference in snowfall amount in the two areas between case A and case B were as follows: For case A, the angle of the inflow toward the mountains with respect to the axis of the mountains was nearly normal, and the wind flow was not prohibited from crossing the mountains in relatively high Froude number (~1.8). So the maximum upward velocity zone was located at around 2 km height above the slope of the mountain, leading to the heavy snowfall in the mountain area. Meanwhile, for case B the wind flow was inhibited from crossing the mountains due to the blocking effect in low Froude number (~0.2), so that the northeast flow over the adjacent sea changed to the northwest flow as it approached the mountains, and was trapped by the mountains. Furthermore, this northwesterly was of downward motion along the slope. Thus this lead the maximum upward velocity zone located at around 1 km height above the coastal area instead of the mountain area. In the result, the snowfall amount in the Yeongdong coastal area was more than that in the mountain area for case B.

Keywords

References

  1. 박용대, 성학중, 박종탁, 1979: 영동고속도로 기상특성. 기상연구소 연구보고서, MR-79-7, 79-88
  2. 송병현, 1993: 우리 나라 동해안 지역과 서해안 지역의 강설 특성 비교 연구. 서울대학교 대학원 석사학위논문, 32pp
  3. 안중배, 조익현, 1998: 한반도 주변 해수면 온도에 따른 중규모 대기 모델 반응.한국기상학회지, 34(4), 643-651
  4. 이재규, 1999: 영동 대설시 대관령과 강릉 지역의 강설량 차이를 일으키는 종관 구조: 사례 연구. 한국기상학회지, 35(3), 319-334
  5. 이재규, 2001: 영동해안 대설사례의 수치모의 연구. 한국기상학회지, 37(1), 293-308
  6. 이훈, 이태영, 1994: 영동 지역의 폭설 요인. 한국기상학회지, 30(2), 197-218
  7. 전종갑, 이동규, 이현아, 1994: 우리 나라에서 발생한 대설에 관한 연구. 한국기상학회지, 30(1), 97-117
  8. 홍성길, 윤종남, 임신자, 서원효, 홍율기, 1980: 태백산맥의 폭우와 폭설. 기상연구소 MR-80-1, 45-47
  9. Baker, D. G., 1970: A study of high pressure ridges to the east of the Appalachian Mountains. Ph. D. thesis, MIT, 127pp
  10. Bell, G. D. and L. F. Bosart, 1988: Appalachian cold-air damming. Mon. Wea. Rev., 116, 137-161 https://doi.org/10.1175/1520-0493(1988)116<0137:ACAD>2.0.CO;2
  11. Bluestein, H. B., 1993: Synoptic-dynamic meteorology in midlatitudes: Observations and theory of weather systems (Vol II). Oxford University Press, New York, 594pp
  12. Bosart, L. F., 1981: The presidents' day snowstorm of 18-19 February 1979: A sub-synoptic scale event. Mon. Wea. Rev., 109, 1542-1566 https://doi.org/10.1175/1520-0493(1981)109<1542:TPDSOF>2.0.CO;2
  13. _____, D. J. Vaudo and J. H. Heldson, Jr., 1972: Coastal frontogenesis. J. Appl. Meteor., 11, 1236-1258 https://doi.org/10.1175/1520-0450(1972)011<1236:CF>2.0.CO;2
  14. Dudhia, J., 1989: Numerical study of convection observed during the Winter Monsoon Experiment using a mesoscale two-dimensional model. J. Atmos. Sci., 46, 3077-3107 https://doi.org/10.1175/1520-0469(1989)046<3077:NSOCOD>2.0.CO;2
  15. Forbes, G. S., R. A. Anthes and D. W. Thomson, 1987: Synoptic and mesoscale aspects of an Appalachian ice storm associated with cold-air damming. Mon. Wea. Rev., 115, 564-591 https://doi.org/10.1175/1520-0493(1987)115<0564:SAMAOA>2.0.CO;2
  16. Hong, S.-Y., and H.-L. Pan, 1996: Nonlocal boundary layer vertical diffusion in a medium-range forecast model. Mon. Wea. Rev., 124, 2322-2339 https://doi.org/10.1175/1520-0493(1996)124<2322:NBLVDI>2.0.CO;2
  17. Kain, J. S., and J. M. Fritsch, 1990: A one dimensional entraining/detraining plume model and its application in convective parameterization. J. Atmos. Sci., 47, 2784-2802 https://doi.org/10.1175/1520-0469(1990)047<2784:AODEPM>2.0.CO;2
  18. Kibayashi, K., 1977: Wind tunnel and field studies of stagnant flow upstream of a ridge. J. Meteor. Soc. Japan, 55, 193-203 https://doi.org/10.2151/jmsj1965.55.2_193
  19. Klemp, J.B, and D.R. Durain, 1983: An upper boundary condition permitting internal gravity wave radiation in numerical mesoscale model. Mon. Wea. Rev., 111, 430-444 https://doi.org/10.1175/1520-0493(1983)111<0430:AUBCPI>2.0.CO;2
  20. Lee, T.-Y., and Y.-Y. Park, 1996: Formation of a mesoscale trough over the Korean peninsula during an excursion of Siberian high. J. Meteor. Soc. Japan, 74, 299-323
  21. Manins, P. C., and B. L. Sawford, 1982: Mesoscale observations of upstream blocking. Quart. J. Roy. Meteor. Soc., 108, 427-434 https://doi.org/10.1002/qj.49710845608
  22. Mason, P. J., and R. I. Skyes, 1978: On the interaction of topography and Ekman boundary layer pumping in a stratified atmosphere. Quart. J. Roy. Meteor. Soc., 104, 475-490 https://doi.org/10.1002/qj.49710444018
  23. Park, S. U. and C. H. Joung, 1984: Air modification over the Yellow Sea during cold-air outbreaks in winter. J. Kor. Meteor. Soc., 20, 35-50
  24. Reynolds, R. W., and T. M. Smith, 1994: Improved Global Sea Surface Temperature Analyses Using Optimum Interpolation. Mon. Wea. Rev., 929-948
  25. Smith, R. B., 1982: Synoptic observations and theory of orographically disturbed wind and pressure. J. Atmos. Sci., 39, 60-70 https://doi.org/10.1175/1520-0469(1982)039<0060:SOATOO>2.0.CO;2
  26. Stauffer, D. R. and T. T. Warner, 1987: A numerical study of Appalachian cold-air damming and coastal frontogenesis. Mon. Wea. Rev., 115, 799-821 https://doi.org/10.1175/1520-0493(1987)115<0799:ANSOAC>2.0.CO;2