Verification of multiple-Doppler-radar derived vertical velocity using profiler data and high resolution examination over complex terrain
碩士 === 國立中央大學 === 大氣科學學系 === 107 === The retrieval of vertical velocity using Doppler radar data always contains large uncertainty. In this study the quality of the vertical velocity retrieved by a 3DVar-based multiple-Doppler wind analysis system named WISSDOM (WInd Synthesis System using DOppler M...
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ndltd-TW-107NCU050210172019-10-22T05:28:15Z http://ndltd.ncl.edu.tw/handle/y9kz9c Verification of multiple-Doppler-radar derived vertical velocity using profiler data and high resolution examination over complex terrain 多都卜勒氣象雷達反演之垂直速度的 剖風儀驗證及高解析度三維風場反演 能力的測試 Yi-An Chen 陳奕安 碩士 國立中央大學 大氣科學學系 107 The retrieval of vertical velocity using Doppler radar data always contains large uncertainty. In this study the quality of the vertical velocity retrieved by a 3DVar-based multiple-Doppler wind analysis system named WISSDOM (WInd Synthesis System using DOppler Measurement) is investigated. Data from one S-band (RCWF) radar and two C-band radars (RCTP and NCU) in northern Taiwan are utilized. The accuracy of the vertical velocity from WISSDOM is examined using two profilers (L-band and UHF) observations. The inter-comparison shows that WISSDOM-derived vertical velocity agrees reasonably well with the profiler data. The highest correlation and the smallest RMSD (Root-Mean-Square Deviation) take place when comparing against the L-band profiler data obtained under vertical beam scanning mode. The WISSDOM-derived results are generally better than those reported in a previous study using ARM scanning radar network in Oklahoma. The winds from the L-band profiler are also merged into WISSDOM, resulting in an overall improvement of the three-dimension wind field at low levels. UHF and RCTP are applied to verify the accuracy of the method. It is shown that WISSDOM assimilating the L-band can reduce RMSD and enhance correlation with UHF and RCTP. The result suggests that the method can get better three-dimension wind field. Finally, WISSDOM retrieved wind field in different terrain with high resolution (100m) is tested. A true wind field is simulated by WRF and two virtual radars are put outside the domain in an OSSE experiment. Both the domain set in a plain and in a mountain show that WISSDOM can retrieve a well-organized wind field. Yu-Chieng Liou 廖宇慶 2019 學位論文 ; thesis 109 zh-TW |
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碩士 === 國立中央大學 === 大氣科學學系 === 107 === The retrieval of vertical velocity using Doppler radar data always contains large uncertainty. In this study the quality of the vertical velocity retrieved by a 3DVar-based multiple-Doppler wind analysis system named WISSDOM (WInd Synthesis System using DOppler Measurement) is investigated. Data from one S-band (RCWF) radar and two C-band radars (RCTP and NCU) in northern Taiwan are utilized.
The accuracy of the vertical velocity from WISSDOM is examined using two profilers (L-band and UHF) observations. The inter-comparison shows that WISSDOM-derived vertical velocity agrees reasonably well with the profiler data. The highest correlation and the smallest RMSD (Root-Mean-Square Deviation) take place when comparing against the L-band profiler data obtained under vertical beam scanning mode. The WISSDOM-derived results are generally better than those reported in a previous study using ARM scanning radar network in Oklahoma.
The winds from the L-band profiler are also merged into WISSDOM, resulting in an overall improvement of the three-dimension wind field at low levels. UHF and RCTP are applied to verify the accuracy of the method. It is shown that WISSDOM assimilating the L-band can reduce RMSD and enhance correlation with UHF and RCTP. The result suggests that the method can get better three-dimension wind field.
Finally, WISSDOM retrieved wind field in different terrain with high resolution (100m) is tested. A true wind field is simulated by WRF and two virtual radars are put outside the domain in an OSSE experiment. Both the domain set in a plain and in a mountain show that WISSDOM can retrieve a well-organized wind field.
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author2 |
Yu-Chieng Liou |
author_facet |
Yu-Chieng Liou Yi-An Chen 陳奕安 |
author |
Yi-An Chen 陳奕安 |
spellingShingle |
Yi-An Chen 陳奕安 Verification of multiple-Doppler-radar derived vertical velocity using profiler data and high resolution examination over complex terrain |
author_sort |
Yi-An Chen |
title |
Verification of multiple-Doppler-radar derived vertical velocity using profiler data and high resolution examination over complex terrain |
title_short |
Verification of multiple-Doppler-radar derived vertical velocity using profiler data and high resolution examination over complex terrain |
title_full |
Verification of multiple-Doppler-radar derived vertical velocity using profiler data and high resolution examination over complex terrain |
title_fullStr |
Verification of multiple-Doppler-radar derived vertical velocity using profiler data and high resolution examination over complex terrain |
title_full_unstemmed |
Verification of multiple-Doppler-radar derived vertical velocity using profiler data and high resolution examination over complex terrain |
title_sort |
verification of multiple-doppler-radar derived vertical velocity using profiler data and high resolution examination over complex terrain |
publishDate |
2019 |
url |
http://ndltd.ncl.edu.tw/handle/y9kz9c |
work_keys_str_mv |
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