| 风廓线雷达对大气折射率结构常数的探测研究 |
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| 引用本文： | 阮征,何平,葛润生.风廓线雷达对大气折射率结构常数的探测研究[J].大气科学,2008,32(1):133-140. |
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| 作者姓名： | 阮征 何平 葛润生 |
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| 作者单位： | 中国气象科学研究院,北京,100081 |
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| 基金项目： | 国家自然科学基金资助项目40675019，国家重点基础研究发展规划项目 2004CB418306，中国气象局气象科技术推广项目 CMATG2005M13 |
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| 摘 要： | 基于湍流散射理论，构建了风廓线雷达（WPR）强度信息对大气折射率结构常数的估算方法。经过对WPR多种探测模式探测数据的估算分析，发现雷达参数的确切选用、信噪比(SNR)测量方法的合理性以及信号累积得益的认定对大气折射率结构常数的准确估算有较大的影响，为此提出适合WPR多种探测模式对该估算值规范化处理方法。利用北京两部对流层风廓线雷达五种探测模式于2005年获取的部分观测数据，进行了规范化计算及对比分析。结果表明，邻近时刻的不同风廓线雷达探测估算结果有较好的一致性，其垂直分布结构合理，呈指数形式, 统计结果与国内外的分析研究结果较为吻合。
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| 关 键 词： | 风廓线雷达 大气折射率结构常数 探测模式 规范化处理 |
| 文章编号： | 1006-9895（2008）01-0133-08 |
| 收稿时间： | 2006-06-09 |
| 修稿时间： | 2006-10-12 |
Determination of Refractive Index Structure Constant with Wind Profile Radar Data |
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| RUAN Zheng,HE Ping and GE Run-Sheng.Determination of Refractive Index Structure Constant with Wind Profile Radar Data[J].Chinese Journal of Atmospheric Sciences,2008,32(1):133-140. |
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| Authors: | RUAN Zheng HE Ping and GE Run-Sheng |
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| Abstract: | Based on the turbulent backscattering theory,the calculation method of the refractive index structure constant(RISC) is devised.Through analyzing the different data from Wind Profile Radar(WPR) with different observing modes,it is found that the result of the RISC depends on the adequacy of radar parameters,the method for determining the Signal-to-Noise Ratio(SNR) and the confirmation of the integral accumulated gain.The standardized processing method is put forward for the different observing modes of WPR.This method is used to process the data from two tropospheric WPRs with five observing modes in Beijing in 2005.After consistency checking for data,the vertical RISC profiles is obtained by using the processing method.The rationality analysis is conducted,including the vertical structure and seasonal change analysis and the comparison with results of other simplified models and radiosonde data.It is concluded:(1) The RISC vertical profiles from different tropospheric WPRs are identical by using the standardized processing method of considering the accurate return signal power and SNR.(2) The analysis of the RISC vertical profiles retrieved from the data of two tropospheric WPRs in Beijing in 2005 indicates that the RISC decreases as exponential function with altitude,and the vertical decrease rate is 2.6 dB/km in summer,similar to the results of other detecting methods home and abroad.The RISC simplified models in Beijing have been gotten.The result of vertical RISC distribution in winter of Beijing is close to the winder result of Doviak's in Denver.(3) There is obvious seasonal variation in the RISC vertical structure retrieved from WPRs at different altitudes.It is mainly because that RISC is one or two orders of magnitude larger in the warm and humidity season than in the dry and cold season in the middle layer of troposphere,but there is little difference between lower and upper layers.(4) A comparison case study was conducted with the output by using radiosonde data at the same location.The structures of the profiles are similar and there is obvious discontinuous stratification at the same altitude. |
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| Keywords: | wind profile radar refractive index structure constant detection mode standardized processing method |
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