Atmosphere (대기)

Korean Meteorological Society (한국기상학회)
권호 표지
DOI QR코드

DOI QR Code

Influence of Local Wind on Occurrence of Fog at Inland Areas

국지풍이 내륙의 안개발생에 미치는 영향

  • Shim, Hwa-Nam (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Lee, Young-Hee (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
  • 심화남 (경북대학교 천문대기과학과) ;
  • 이영희 (경북대학교 천문대기과학과)
  • Received : 2017.03.10
  • Accepted : 2017.06.14
  • Published : 2017.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

We have examined the influence of local wind on occurrence of fog at two inland areas, Chuncheon and Andong, in Korea. The surrounding topography of two inland areas shows significant difference: Chuncheon is located in the basin surrounded by ridges with north-south axis while Andong is located in the valley between the ridges with east-west axis. Occurrence of fog shows maximum in October at both sites but high occurrence of fog at Chuncheon is also noted in the winter. Occurrence of fog at Andong in October is much larger than that at Chuncheon. High occurrence of fog in October is due to favorable synoptic condition for fog formation such as weak wind, clear day and small depression of the dew-point. Fog occurrence at Chuncheon is closely related to very weak wind condition where wind speed is less than $0.5m\;s^{-1}$. The weak wind at Chuncheon in winter is due that pressure driven channeling wind (southerly) cancels out partly downslope northerly flow during nighttime. On the other hand, fog at Andong occurs well when wind is southeasterly which is thermally forced flow during nighttime. Southeasterly provides cold, moist air from the narrow valley to Andong during nighttime, leading to favorable condition for formation of fog.

Keywords

References

  1. Ahrens, C. D., 2009: Meteorology today. 9th Ed. Brooks/ Cole, 549 pp.
  2. Arya, S. P., 2001: Introduction to micrometeorology. 2nd Ed. Academic Press, 420 pp.
  3. Belorid, M., C. B. Lee, J.-C. Kim, and T.-H. Cheon, 2015: Distribution and long-term trends in various fog types over South Korea. Theor. Appl. Climatol., 122, 699-710, doi:10.1007/s00704-014-1321-x.
  4. Carrera, M. L., J. R. Gyakum, and C. A. Lin, 2009: Observational study of wind channeling within the St. Lawrence River Valley. J. Appl. Meteor. Climatol. 48, 2341-2361. https://doi.org/10.1175/2009JAMC2061.1
  5. Clark, P. A., and W. P. Hopwood, 2001: One-dimensional site-specific forecasting of radiation fog. Part I: Model formulation and idealised sensitivity studies. Meteor. Appl., 8, 279-286. https://doi.org/10.1017/S1350482701003036
  6. Jhun, J.-G., E.-J. Lee, S.-A. Ryu, and S.-H. Yoo, 1998: Characteristics of regional fog occurrence and its relation to concentration of air pollutants in South Korea. J. Korean Meteor. Soc., 34, 486-496.
  7. Kim, D.-W., and H.-R. Byun, 2008: Spatial and temporal distribution of wind resources over Korea. Atmosphere, 18, 171-182 (In Korean with English abstract).
  8. KoROAD, 2015: Fog zone - Road traffic safety management measures, Report 2015. 3, 17 pp.
  9. Lee, H.-D., and J.-B. Ahn, 2013: Study on classification of fog type based on its generation mechanism and fog predictability using empirical method. Atmosphere, 23, 103-112, doi:10.14191/Atmos.2013.23.1.103 (In Korean with English abstract).
  10. Lee, K.-M., and M.-S. Suh, 2011: A study on the characteristics of fog and development of prediction technique in the Chung-Cheong area. J. Clim. Res., 6, 200-218.
  11. Lee, S., 1998: The impacts of the Chungju lake on the fog characteristics of its surrounding area. J. Korean Geographic. Soc., 33, 165-177 (in Korean with English abstract).
  12. Park, S.-Y., H.-W. Lee, D.-H. Kim, and S.-H. Lee, 2010: Numerical study on wind resources and forecast around coastal area applying inhomogeneous data to variational data assimilation. J. Environ. Sci. Int., 19, 983-999, doi:10.5322/JES.2010.19.8.983 (in Korean with English abstract).
  13. Prabha, T. V., A. Karipot, and M. W. Binford, 2007: Characteristics of secondary circulations over an inhomogeneous surface simulated with large-eddy simulation. Bound.-Layer Meteor., 123, 239-261, doi:10.1007/s10546-006-9137-6.
  14. Raasch, S., and G. Harbusch, 2001: An analysis of secondary circulations and their effects caused by smallscale surface inhomogeneities using large-eddy simulation. Bound.-Layer Meteor., 101, 31-59. https://doi.org/10.1023/A:1019297504109
  15. Reuter, H. I., A. Nelson, and A. Jarvis, 2007: An evaluation of void-filling interpolation methods for SRTM data. Int. J. Geogr. Inf. Sys., 21, 983-1008. https://doi.org/10.1080/13658810601169899
  16. Sun, J., R. Desjardins, L. Mahrt, and I. MacPherson, 1998: Transport of carbon dioxide, water vapor, and ozone by turbulence and local circulations. J. Geophys. Res., 103, 25873-25885. https://doi.org/10.1029/98JD02439
  17. Tardif, R., and R. M. Rasmussen, 2007: Event-based climatology and typology of fog in the New York City region. J. Appl. Meteor. Climatol., 46, 1141-1168. https://doi.org/10.1175/JAM2516.1
  18. Vidale, P. L., R. A. Pielke Sr., L. T. Steyaert, and A. Barr, 1997: Case study modelling of turbulent and mesoscale fluxes over the BOREAS region. J. Geophys. Res., 102, 29167-29188. https://doi.org/10.1029/97JD02561
  19. Whiteman, C. D., 1990: Observations of thermally developed wind systems in mountainous terrain. In W. Blumen Ed., Atmospheric Processes over Complex Terrain, Meteorological Monographs. No. 23, Amer. Meteor. Soc., 5-42.
  20. Whiteman, C. D., and J. C. Doran, 1993: The relationship between overlying synoptic-scale flow and winds within a valley. J. Appl. Meteor., 32, 1669-1682. https://doi.org/10.1175/1520-0450(1993)032<1669:TRBOSS>2.0.CO;2