Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
권호 표지
DOI QR코드

DOI QR Code

Impact of Topographic Forcing and Variation of Lower-level Jet on Local Precipitation in Southeast Region of Korean Peninsula

지형 강제력과 하층제트 변화가 한반도 남동 지역 국지 강수에 미치는 영향 분석 연구

  • Chae, Da Eun (Department of Earth Science, The Graduate School Pusan National University) ;
  • Kim, Eun Ji (Department of Earth Science, The Graduate School Pusan National University) ;
  • Kim, Ji Seon (Department of Earth Science, The Graduate School Pusan National University) ;
  • Lee, Soon-Hwan (Department of Earth Science Education, Pusan National University)
  • 채다은 (부산대학교 지구과학과) ;
  • 김은지 (부산대학교 지구과학과) ;
  • 김지선 (부산대학교 지구과학과) ;
  • 이순환 (부산대학교 지구과학교육과)
  • Received : 2019.07.27
  • Accepted : 2019.11.19
  • Published : 2020.01.31
Download PDF
⟨ Previous Next ⟩

Abstract

Recently, a heavy rainfall with high spatial variation occurred frequently in the Korean Peninsula. The meteorological event that occurred in Busan on 3 May 2016 is characterized by heavy rain in a limited area. In order to clarify the reason of large spatial variation associated with mountain height and location of low level jet, several numerical experiments were carried out using the dynamic meteorological Weather Research and Forecasting (WRF) model. In this case study, the raised topography of Mount Geumjeong increased a barrier effect and air uplifting due to topographic forcing on the windward side. As a result, wind speed reduced and precipitation increased. In contrast, on the downwind side, the wind speed was slightly faster and since the total amount of water vapor is limited, the precipitation on the downwind side reduced. Numerical experiments on shifting the location of the lower jet demonstrated that if the lower jet is close to the mountain, its core becomes higher due to the effect of friction. Additionally, the water vapor convergence around the mountain increased and eventually the precipitation also increased in the area near the mountain. Hence, the location information of the lower jet is an important factor for accurately predicting precipitation.

Keywords

References

  1. Chakraborty, A., Nanjundiah, R. S., Srinivasan, J., 2009, Impact of African orography and the Indian summer monsoon on the low-level Somali jet, Int. J. Climatol., 29, 983-992. https://doi.org/10.1002/joc.1720
  2. Chen, C. S., Lin, Y. L., Peng, W. C., Liu., C. L., 2010, Investigation of a heavy rainfall event over southwestern Taiwan associated with a subsynoptic cyclone during the 2003 Mei-Yu season, Atmos. Res., 95(2-3), 235-254. https://doi.org/10.1016/j.atmosres.2009.10.003
  3. Flesch, T. K., Reuter, G. W., 2012, WRF model simulation of two Alberta flooding events and the impact of topograpy, J. Hydrometeor., 13(2), 695-708. https://doi.org/10.1175/JHM-D-11-035.1
  4. Hong, S. Y., Lee, J. W., 2009, Assessment of the WRF model in reproducing a flash-flood heavy rainfall event over Korea, Atmos. Res., 93(4), 818-831. https://doi.org/10.1016/j.atmosres.2009.03.015
  5. Hwang, S. O., Lee, D. K., 1993, A Study on the relationship between heavy rainfalls and associated low-level jets in the Korean Peninsula, J. Korean Meteor. Soc., 29(2), 133-146.
  6. Jeong, G. Y., Ryu, C. S., 2008, The synoptic characteristic of heavy rain in South Korea, J. of the Chosun Natural Science, 2(1), 89-114.
  7. Jung, S. P., Kwon, T. Y., Han, S., O., 2014, Thermodynamic characteristics associated with localized torrential rainfall events in the middle west region of Korean Peninsula, J. Korean Meteor. Soc., 24(4), 457-470.
  8. Kim, A. H., Lee, T. Y., 2016, A Study of a heavy rainfall event in the middle Korean Peninsula in a situation of a synoptic-scale ridge over the Korean Peninsula, J. Korean Meteor. Soc., 26(4), 577-598.
  9. Kim, S., H., 2014, Topography of Busan. http://busan.grandculture.net/ Contents?local=busan&dataType=01&contents_id=GC04213428.
  10. Lowery, M. R. K., Yang, Z. L., 2008, Multiscale convective overturning in mesoscale convective systems: reconciling observations, simulations, and theory, Wea. Forecasting, 23, 1102-1126. https://doi.org/10.1175/2008WAF2006082.1
  11. Park, C. H., 2000, The effect of low-level jet and topography associated with heavy rainfalls occurred over southern Korea, M. A. Dissertation, Pusan University.
  12. Park, C. H., Lee, H. W., Jung, W. S., 2003, The effects of low-level jet and topography on heavy rainfall near Mt. Jirisan, J. Korean Meteor. Soc., 39(4), 441-458.
  13. Park, S. U., Kim, S. S., Lim, G. H., 1983, Low level jets associated with severe storms over Korea, J. Korean Meteor. Soc., 19(2), 20-36.
  14. Rebora, N., Molini, L., Casella, E., Comellas, A., Fiori, E., Pignone, F., Siccardi, F., Silvestro, F., Tanelli, S., Parodi, A., 2013, Extreme rainfall in the Mediterranean: What can we learn from obaservation?, J. Hydrometeor., 14(3), 906-922. https://doi.org/10.1175/JHM-D-12-083.1
  15. Ting, M., Wang, H., 2005, The role of the north American topography on the maintenance of the Great Plains summer low-level jet, J. Atmos. Sci., 63, 1056-1068. https://doi.org/10.1175/JAS3664.1
  16. Wang, D., Zhang, Y., Huang, A., 2013, Climatic features of the south-westerlylow-level jet over Southeast China and its association with precipitation over East China, Asia-Pac. J. Atmos. Sci., 49(3), 259-270. https://doi.org/10.1007/s13143-013-0025-y
  17. Woo, S., H., Yim, S., Y., Kwon, M., H., Kim, D., J., 2017, Decadal change in rainfall during the changma period in early-2000s, J. Korean Meteor. Soc., 27(3), 345-358.