DOI QR코드

DOI QR Code

Wind Vector Quality Control Using Symmetry of Doppler Spectral Peak

도플러 스펙트럼 대칭성을 이용한 바람 벡터 품질 관리

  • 김민성 (부경대학교 환경대기과학과) ;
  • 이경훈 (부경대학교 환경대기과학과) ;
  • 권병혁 (부경대학교 환경대기과학과) ;
  • 윤홍주 (부경대학교 공간정보시스템공학과)
  • Received : 2020.08.31
  • Accepted : 2020.10.15
  • Published : 2020.10.31

Abstract

The 1.29 GHz wind profiler radar is a remote observation device that is useful not only for calculating wind vectors in clear air, but also for detecting rainfall. The Doppler spectrum symmetry test is essential in the horizontal wind treatment process. Since asymmetry may be detected in rainfall cases, it is necessary to reflect in the wind calculation algorithm that the sign of the radial velocity is the same according to the magnitude of the vertical velocity. In the summer of 2017 (June, July), a wind vector calculation algorithm by Bragg scattering and Rayleigh scattering was developed using Changwon wind profiler data, and verified by comparing it with radiosonde data at 6 hour intervals.

1.29 GHz 윈드프로파일러 레이더는 청천의 바람 벡터 산출뿐만 아니라 강우 탐지에도 유용한 원격 관측 장비이다. 수평 바람 처리 과정에서 도플러 스펙트럼의 대칭성 검사는 필수 사항이다. 강우가 있을 때는 대칭성이 나타나지 않을 수 있기 때문에 연직속도의 크기에 따라 시선속도의 부호가 같아지는 것을 바람 산출 알고리즘에 반영하여야 한다. 2017년 여름철(6월, 7월) 창원 윈드프로파일러 자료로 브래그 산란과 레일리 산란에 의한 바람 벡터 산출 알고리즘을 개발하고, 대칭성을 고려하여 품질 관리된 윈드프로파일러 바람벡터를 6시간 간격의 라디오존데 자료와 비교하여 검증하였다.

Keywords

References

  1. F. Ralph, P. Neiman, and D. Ruffieux, "Precipitation identification from Radar wind profiler spectral moment data: Vertical velocity histograms, velocity variance, and signal power-vertical velocity correlations", Journal of Atmospheric and Oceanic Technology, vol. 13, no. 3, 1996, pp. 545-559. https://doi.org/10.1175/1520-0426(1996)013<0545:PIFRWP>2.0.CO;2
  2. S. Baek, C. Cho, and H. Song, "Analyses of Precipitation Cases Using Wind Profiler," Journal of Korean Meteorological Society, vol. 41, no. 1, 2005, pp. 1-16.
  3. K. Gage, C. Williams, and W. Ecklund, "UHF wind profilers: A new tool for diagnosing tropical convective cloud systems", Bulletin of the American meteorological society, vol. 75, no. 12, 1994, pp. 2289-2294. https://doi.org/10.1175/1520-0477(1994)075<2289:UWPANT>2.0.CO;2
  4. K. Gage, C. Williams, and W. Ecklund, "Application of the 915 MHz profiler for diagnosing and classifying tropical convective cloud systems," Meteorology and Atmospheric Physics, vol. 59, no. 1, 1995, pp. 141-151. https://doi.org/10.1007/BF01032005
  5. W. Ecklund, K. Gage, and C. Williams, "Tropical precipitation studies using 915 MHz wind profilers," Radio scienc, vol. 30, no. 4, 1995, pp. 1055-1064. https://doi.org/10.1029/95RS00640
  6. K. Reddy, T. Kozu, Y. Ohno, K. Nakamura, A. Higuchi, K. Reddy, P. Srinivasulu, V. Anandan, A. Jain, P. Rao, R. Rao, G. Viswanthan, and D. Rao, "Planetary boundary layer and precipitation studies using Lower atmospheric wind profiler over Tropical India," Radio scienc, vol. 37, no. 4, 2002, pp. 1-30 https://doi.org/10.1029/2000RS002569
  7. D. Atlas and C. Williams, "The Anatomy of a continental tropical convective storm," Journal of the atmospheric sciences, vol. 60, no. 1, 2003, pp. 3-15. https://doi.org/10.1175/1520-0469(2003)060<0003:TAOACT>2.0.CO;2
  8. W. Jo, B. Kwon, and H. Yoon, "Partitioning Bimodal Spectrum Peak in Raw Data of UHF Wind Profiler," J. of the Korea Institute of Electronic Communication Sciences, vol. 14, no. 1, 2019, pp. 61-68. https://doi.org/10.13067/JKIECS.2019.14.1.61
  9. W. Jo, B. Kwon, and H. Yoon, "Retrieval of Radial Velocity and Moment Based on the Power Spectrum Density of Scattered 1290 MHz Signals with Altitude," J. of the Korea Institute of Electronic Communication Sciences, vol. 13, no. 6, 2018, pp. 1191-1198. https://doi.org/10.13067/JKIECS.2018.13.6.1191
  10. W. Jo, B. Kwon, and H. Yoon, "Clutter Fence Effect on Data Quality of Ultra High Frequency Radar," J. of the Korea Institute of Electronic Communication Sciences, vol. 14, no. 2, 2019, pp. 275-282. https://doi.org/10.13067/JKIECS.2019.14.2.275
  11. R. Gunn and G. Kinzer, "The terminal velocity of fall for water droplets in stagnant air," Journal of Meteorology, vol. 6, 1949, pp. 243-248 https://doi.org/10.1175/1520-0469(1949)006<0243:TTVOFF>2.0.CO;2