中大機構典藏-NCU Institutional Repository-提供博碩士論文、考古題、期刊論文、研究計畫等下載:Item 987654321/5026
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 70585/70585 (100%)
造访人次 : 23152502      在线人数 : 487
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/5026


    题名: 雨滴粒徑分布模擬─雙偏極化雷達驗證;Simulation of Raindrop Size Distribution:Verification using the Dual-polarization Radar
    作者: 曾威仁;Wei-ren Tseng
    贡献者: 大氣物理研究所
    关键词: 雲模式;雷達;雨滴粒徑分布;cloud model;bin model;raindrop size distribution;radar;DSD
    日期: 2007-07-06
    上传时间: 2009-09-22 09:43:19 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 大學雙偏極化雷達反演空中雨滴粒徑分布之技術,模擬台灣山區夏季午後天氣系統中,層狀區與對流區之雨滴粒徑分布的演化過程,並以雷達觀測產品作為驗證。 研究結果發現,在沒有考慮水平方向空氣平流的情況下,透過給予一組層狀區上空3.5公里處的雨滴粒徑分布,一維雲模式能夠順利掌握到該區域的中值體積直徑向下逐漸增加、高低層差值隨時間逐漸減小的趨勢。此外模擬9至10分鐘後其模擬之垂直分布即相當接近雷達的反演場。強度逐漸減弱的對流區,模式計算出來的中值體積直徑在離地3.5至2.5公里的1公里內有減小的趨勢、在2.5公里以下則維持平衡的狀況不再變化。而雷達反演的中值體積直徑在3.5公里以下則是一直保持定值。推論主要的原因包含對流區可能存在本實驗並未內入模式計算的空氣平流運動;並且不論是雷達反演雨滴粒徑分布、或者一維雲模式均以無冰相粒子的暖雨過程作為前提,倘若該區域為冰水混相的狀態,則需要經由濾除冰粒子的數量方能有效進行應用。 Along the long history of the microphysical model development, the distrometer is one of the main tools to verify the evolution of the raindrop size distribution from the model calculation. In this research, the advantages of the dual-polarization radar, such as, the greater spatial and temporal resolution, and the ability of retrieving the raindrop size distribution using the reflectivity (ZH) , differential reflectivity (ZDR), and a given μ - Λ relationship in the gamma form distribution. So, the major purpose of this research is to use radar data to confirm the output of the one dimensional cloud model during the real case. In order to understand the characteristics in both the stratiform and convective zones of a summer thunderstorm in North Taiwan, the raindrop size distribution in both regions were carefully retrieved from the dual-polarization radar data. There are distinct results in the stratiform and convective zones. In the stratiform zone, the median volume diameter (D0) retrieved from the NCU radar is increasing downward. Although lacking the advection information in the model, the outputs agree well with the observation data. In the convective zone, the median volume diameter computed from the model is decreasing at first 1 km decent and then near constant along the rest of the fall. The radar retrieval were also near constant below 3.5 km however. The possible explanations are the existence of ice or supercooled water in the convective area; it causes the error in both radar retrieval and model calculations because of the default warm rain assumption.
    显示于类别:[大氣物理研究所 ] 博碩士論文

    文件中的档案:

    档案 大小格式浏览次数


    在NCUIR中所有的数据项都受到原著作权保护.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈  - 隱私權政策聲明