Title page for 986203019


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Student Number 986203019
Author Ren-hao Kel(柯人豪)
Author's Email Address No Public.
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Department Graduate Institute of Space Science
Year 2010
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Analysis of Precipitation Melting layer by Wind Profilers' data at Taiwan and Palau.
Date of Defense 2011-07-04
Page Count 89
Keyword
  • bright band
  • melting layer
  • precipitation
  • radar
  • wind profiler
  • Abstract We used an algorithm to pick out the data with melting layer signal produced by straitiform precipitations from the data observed by the UHF Wind Profilers at Taiwan, 2006 and Palau, 2003–2006. Then we defined the “bright band” heights by range-corrected SNR data and the “rain top” heights by Doppler vertical velocity (DVV) data and averaged them monthly, comparing to the bright band heights data by the TRMM satellite and 0 degree C isothermal heights data by radiosonde. We found the notable phenomenon of seasonal variation at Taiwan but none at Palau. Then we classified these data at Taiwan into 5 categories: (1) spring frontal system, (2) Mei-Yu frontal system, (3) Typhoon and (4) afternoon shower, and (5) autumn frontal system. Using the
    zonal wind data we divided the data at Palau into easterly regime and westerly regime then analysed them.
      On the other hand we used three methods to define the thickness of melting layer: (1) Taking differences of 0degree C isotherm heights by radiosonde and rain top heights by wind profiler within one hour after each launching. (2) Taking differences of bright band heights and rain top heights both by wind profiler. (3) Taking differences between the upper bound and lower bound of
    each SNR profiles using an algorithm. We found the better results at Palau by first method due to the nearer distance between radiosonde and wind profiler. And the second, third method we haven’t found the notable phenomenon of monthly variation both at Taiwan and Palau.
    Table of Content 摘要 ............................................ i
    Abstract ........................................ ii
    誌謝 ............................................ iii
    目錄 ............................................ iv
    圖目錄 .......................................... vi
    表目錄 .......................................... viii
    第一章 緒論 ..................................... 1
     1-1 研究回顧及介紹 ............................ 1
     1-2 研究動機 .................................. 4
     1-3 論文內容概述 .............................. 5
    第二章 儀器介紹與資料處理 ....................... 7
     2-1 儀器簡介 .................................. 7
      2-1.1 剖風儀 ................................ 7
      2-1.2 無線電探空儀 .......................... 9
      2-1.3 Tropical Rainfall Measuring Mission(TRMM)衛星 ................................................. 10
     2-2 資料處理流程 .............................. 11
    第三章 台灣地區的融解層特性 ..................... 14
     3-1 資料取得 .................................. 14
     3-2 降雨資料 .................................. 16
     3-3 融解層高度變化 ............................ 18
      3-3.1 颱風以外的其他類型降水 ................ 20
      3-3.2 颱風 .................................. 24
     3-4 分析與探討 ................................ 27
     3-5 融解層厚度變化 ............................ 32
     3-6 分析與探討 ................................ 36
     3-7 小結 ...................................... 38
    第四章 帛琉地區的融解層特性 ..................... 40
     4-1 資料取得 .................................. 40
      4-1.1 亮帶資料 .............................. 40
      4-1.2 帛琉探空站風場資料與剖風儀風場風資料比對 ................................................. 42
     4-2 定義東風時期和西風時期 .................... 44
     4-3 降雨資料 .................................. 47
     4-4 融解層高度變化 ............................ 51
     4-5 分析與探討 ................................ 62
     4-6 融解層厚度變化 ............................ 65
     4-7 分析與探討 ................................ 69
     4-8 小結 ...................................... 71
    第五章 總結 ..................................... 73
    參考文獻 ........................................ 76
    Reference 〔1〕 Chen, C. -S. and Y.-L. Chen, “The rainfall characteristics of Taiwan”, Mon. Wea. Rev., 131, 1323–1341, 2003
    〔2〕 Chen, C.-S., Y.-L. Chen, C.-L. Liu, P.-L. Lin and W.-C. Chen, “The statistics of heavy rainfall occurrences in Taiwan”, Weather Forecasting.
    22, 981-1002, 2007b
    〔3〕 Harris, G. N. Jr., K. P. Bowman, and D.-B. Shin, “Comparison of freezing-level altitudes from the NCEP reanalysis with TRMM precipitation radar brightband data”, J. Climate, 13, 4137–4148, 2000.
    〔4〕 Kummerow, C., W. Barnes, T. Kozu, J. Shiue, and J. Simpson, “The tropical rainfall measuring mission (TRMM) sensor package”, J. Atmo. Ocean. Tech., 15, 809-817, 1998
    〔5〕 Kubota, H., R. Shirooka, T. Ushiyama, T. Chuda, S. Iwasaki, and K. Takeuchi, “Seasonal Variations of Precipitation Properties Associated with the Monsoon over Palau in the Western Pacific”, J. Hydrometeor., 6:518–531, 2005
    〔6〕 Pan, C. J., H. C. Lai, S. S. Yang, K. K. Reddy, and, S.-C. Chang, “Wind profiler radar investigation on typhoonorography interaction”, Geophys. Res. Lett., 35, L24812, doi:10.1029/2008GL036368, 2008
    〔7〕 Pan , C. J., K. Krishna Reddy, H. -C. Lai, and, S. -S. Yang, “Role of mixed precipitating cloud systems on the typhoon rainfall”, Ann. Geophys., 28, 11–16, 2010.
    〔8〕 Soman, M. K., and K. K. Kumar, “Space time evolution of meteorological features associated with the onset of Indian summer monsoon”, Mon. Weather Rev., 21, 1177–1194, 1993.
    〔9〕 Waliser, D. E. and C. Gauter, “A Satellite-Derived Climatology of the ITCZ”, J. Climate, 6, 2162-2174, 1993
    〔10〕 White, A. B., D. J. Gottas, E. T. Strem, F. M. Ralph, and P. J. Neiman, “An automated brightband height detection algorithm for use with Doppler radar spectral moments”, J. Atmos. Oceanic Technol., 19, 687–697, 2002.
    〔11〕 Williams, C. R., W. L. Ecklund, and K. S. Gage, “Classification of precipitating clouds in the tropics using 915-MHz wind profilers”, J. Atmos. Oceanic Technol., 12, 996–1012, 1995.
    〔12〕 Wilson, C. L. and J. Tan, “Melting Layer Studies in Singapore, “Experimental Results from an S-Band Doppler Polarisation-Diversity Radar”, Phys. Chem. Earth (B), Vol. 25, No. 10-12, pp. 1129-1132, 2000.
    〔13〕 Wu, R., and B. Wang, “Interannual variability of summer monsoon onset over the western North Pacific and the underlying processes”, J. Climate, 13, 2483–2501, 2000
    〔14〕 http://www.prh.noaa.gov/peac/update-past.php
    Advisor
  • Chen-Jeih Pan(潘貞杰)
  • Files
  • 986203019.pdf
  • approve immediately
    Date of Submission 2011-07-21

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