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1
題名:An Improved Estimate of Layer Thickness in the Atmosphere Using Dual-Frequency Interferometry Method of MST-VHF Radar    
著者:Jenn-Shyong ChenYen-Hsyang Chu
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:Atmospheric layer structure ; Chung-Li VHF radar ; Frequency domain interferometry
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:15卷4期(2004.11)
頁碼:743-756
語言:英語
摘要: 英文摘要PDF

The purpose of this study was to obtain a more precise estimate of the thickness of an atmospheric layer structure, based on the theoretical works of Chen and Chu (2001), using a modified dual-frequency interferometry method of MST radar. Horizontal layer structures in the atmosphere are frequently formed due to vertically confined refractivity irregularities. The thickness and position of a layer structure can be measured by Frequency Domain Interferometry (FDI) technique, using two or more carrier frequencies. The condition of a single-Gaussian layer is generally assumed to facilitate the mathematical manipulation in the FDI method but this rigorous condition is very difficult to satisfy due to multiple layers and varied atmospheric structures. Consequently, the thickness and position of a layer, obtained by the FDI method, may differ from true ones. Chen and Chu (2001) verified this, in results obtained from their theoretical/numerical examination. Moreover, they found various kinds of relationships between the thickness and position of a layer. These findings have been attributed to the coupling of various layer structures and the range weighting function of the radar system. The thickness-position relationship indicates that the estimated layer thickness might be closer to the true one at some places more than others, depending on the layer structure involved in the radar volume. This study examined dual-frequency observations carried out with the Chung-Li VHF radar, to reveal the prevailing thickness-position relationship and deduce the potential layer structure. In general, a thickness-position relationship with a smaller thickness at the central height of the radar volume was obtained. This result was possibly due to multiple layers (more than two layers) or a single layer in company with significant background scatterers. According to numerical calculations, this kind of thickness-position relationship indicates that the thickness at the central height of the radar volume is closer to the true one. A quasi-linear relationship between layer thickness and radar pulse length was also observed, which demonstrated further that multiple layers and background scatterers have a significant impact on the thickness-position relationship of a layer. Since the radar volume for a short pulse length might contain just a single layer and fewer background scatterers, the data of 1-μs pulse length were adopted to estimate approximate layer thickness. Using this approximation and taking into account the thickness around the central height of the sampling gate, the estimated layer thicknesses were found to be around 30 meters and approximately 70% of them were smaller than 60 meters.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 15卷4期 (2004.11)
Morphology and Dynamic Sedimentology in front of the Retreating Tsengwen Delta, Southwestern Taiwan/ Eason HongTien-Chi HuangHo-Shing Yu
Improvement of GPS/MET Ionospheric Profiling and Validation Using the Chung-Li Ionosonde Measurements and the IRI model/ Lung-Chih TsaiWei-Hsiung Tsai
Investigating Subsurface Structures and P- and S-wave Velocities in the Taipei Basin/ Chien-Ying WangYi-Hen LeeMang-Long GerYi-Ling Chen
Analyzing the Relationship between Terminal Velocity of Raindrops and VHF Backscatter from Precipitation/ Ching-Lun SuYen-Hsyang ChuChun-Yi Chen
Relocation of Eastern Taiwan Earthquakes and Tectonic Implications/ Hao KuochenYih-Min WuChien-Hsin ChangJyr-Ching HuWen-Shan Chen
Multi-station Studies on Spread-F and VHF Scintillations in the Indian Sector/ P. V. S. Rama RaoD. S. V. V. D. PrasadK. NiranjanG. UmaS. Gopi KrishnaK. Venkateswarlu
Coseismic Movement and Seismic Ground Motion Associated with the 31 March 2002 off Hualien, Taiwan, Earthquake/ Horng-Yue ChenLong-Chen KuoShui-Beih Yu
Assessment of Traffic Contribution to Hydrocarbons Using 2,2-Dimethylbutane as a Vehicular Indicator/ Chih-Chung ChangTai-Yih ChenClock ChouShaw-Chen Liu
Ethology of the Zoophycos-Producer: Arguments Against the Gardening Model from δ13Corg Evidences of the Spreiten Material/ Ludvig LowemarkIn-Tian LinChung-Ho WangChih-An HuhKuo-Yen WeiChih-Wei Chen
Source Parameters of Regional Earthquakes in Taiwan: January-December, 2002/ Wen-Tzong LiangYu-Hua LiuHonn Kao
An Improved Estimate of Layer Thickness in the Atmosphere Using Dual-Frequency Interferometry Method of MST-VHF Radar/ Jenn-Shyong ChenYen-Hsyang Chu
 
   
 
   

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