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Student Number 966201001
Author Ting-Chi Wu(吳婷琦)
Author's Email Address chi9350709@gmail.com
Statistics This thesis had been viewed 923 times. Download 455 times.
Department Graduate Institute of Atmospheric Physics
Year 2008
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Impacts of meteorological surface nudging on air quality simulation in Taiwan
Date of Defense 2009-06-10
Page Count 106
Keyword
  • analysis nudging
  • Abstract Meteorological fields are necessary input for air quality modeling. Wind field is responsible for pollutant transport and turbulent mixing in the troposphere. In this work we studied the impact of analysis nudging of meteorological variables on model performance both for meteorological variables and for air quality variables.
         Taiwan Environmental Administration has maintained a network of densely distributed monitoring stations for air quality with associated meteorological observations. We applied this network of 72 meteorological observations to nudge hourly wind speed, wind direction and temperature. Then we used the new meteorological data to conduct air quality study. We first noted that the standard analysis nudging technique as in MM5 and WRF models needs to be modified in order to be applicable to simulation domains such as Taiwan where nudging observations are all located near the center of the simulation domain. In such case surface nudging with the MQD method leads to undesirable changes in oceanic areas around Taiwan. With our modified MQD technique we are able to develop physically acceptable nudging meteorological fields.
         We first studied the impact of variations of the three surface nudging constraints, nudging coefficients, nudging variables and nudging domain on meteorological simulation. We found that surface nudging of wind field every 6 hours can reduce hourly surface wind speed to near observations for most of the simulation period. But temperature nudging can lead to unacceptable results if the nudging coefficient is too large. We found this is mostly due to unreasonably fast and deep planetary boundary layer development in the morning and at the evening. Such nudging will while improves surface temperature simulation does lead to overly strong vertical mixing and highly reduced surface pollutant mixing ratios very different from actual observation. Careful structuring of 3-D nudging domains also can improve meteorological simulations such as for the Typhoon Nockten period in 2004 which happens to be within the early part of our selected study period. 
         For air quality study we found that surface nudging while improved simulation of surface wind field it did not change surface ozone simulation significantly, at least around the land based monitoring stations. But the change in 3-D wind structure did change local circulations that led to differences in off shore flow of pollutants and deposition of acidic materials.
    Table of Content 目錄
    摘要i
    Abstractiii
    致謝v
    目錄vii
    附表說明x
    附圖說明xiii
    第一章 前言1
    1-1 研究背景1
    1-2 研究動機2
    第二章 文獻回顧4
    2-1 納進法於氣象模擬的應用4
    2-1-1 Analysis nudging4
    2-1-2 Multiquadric Interpolation5
    2-2. 納進法對於大氣化學模擬的影響6
    第三章 研究方法8
    3-1 資料來源9
    3-1-1 台灣環保署地面監測站9
    3-1-2 NCEP GFS (AVN)9
    3-2 模式簡介10
    3-2-1 氣象模式10
    3-2-2 空氣品質模式11
    3-3 分析納進法12
    3-3-1 分析納進步驟12
    3-3-2 改良分析納進法13
    3-4 實驗設計16
    3-4-1 個案選擇與模式設定16
    3-4-2 實驗設計17
    3-5 納進策略與氣象場評估18
    3-5-1 納進係數與納進係數延伸實驗18
    3-5-2 納進變數實驗19
    3-5-3 納進網域實驗19
    3-5-4 氣象場驗證20
    第四章 模擬結果與討論22
    4-1 納進實驗氣象場模擬結果22
    4-1-1 測站風向、風速、氣溫與模擬的比較22
    4-1-1a 與環保署 72 個測站相比22
    4-1-1b 與氣象局 26 個測站相比23
    4-1-2 地面風場24
    4-2 納進實驗化學場模擬結果25
    4-2-1 測站臭氧、NOx、NMHC 與模擬的比較25
    4-2-2 臭氧的空間分布30
    4-2-3 臭氧前驅物 NOx 的空間分布31
    4-2-4 臭氧前驅物 NMHC 的空間分布32
    4-3 討論納進係數實驗33
    4-3-1邊界層高度分布33
    4-3-2 地面溫度分布34
    4-4 討論納進變數實驗34
    4-4-1 垂直運動與累積降雨34
    4-4-2 硝酸、硫酸鹽類濕沈降量36
    4-5 討論納進網域實驗36
    4-5-1 納坦颱風地面風場36
    第五章 結論與未來展望38
    5-1 結論38
    5-2 未來展望39
    參考文獻41
    附表44
    附圖64
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    Advisor
  • Julius S. Chang(張時禹)
  • Files
  • 966201001.pdf
  • approve immediately
    Date of Submission 2009-07-01

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