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国家自然科学基金(40975014)

作品数:5 被引量:51H指数:4
相关作者:王改利赵翠光王红艳刘黎平王德旺更多>>
相关机构:中国气象科学研究院中国气象局成都信息工程大学更多>>
发文基金:国家自然科学基金中央级公益性科研院所基本科研业务费专项更多>>
相关领域:天文地球自动化与计算机技术电子电信更多>>

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Retrieving Microphysical Properties and Air Motion of Cirrus Clouds Based on the Doppler Moments Method Using Cloud Radar被引量:4
2012年
Radar parameters including radar reflectivity, Doppler velocity, and Doppler spectrum width were obtained from Doppler spectrum moments. The Doppler spectrum moment is the convolution of both the particle spectrum and the mean air vertical motion. Unlike strong precipitation, the motion of particles in cirrus clouds is quite close to the air motion around them. In this study, a method of Doppler moments was developed and used to retrieve cirrus cloud microphysical properties such as the mean air vertical velocity, mass-weighted diameter, effective particle size, and ice content. Ice content values were retrieved using both the Doppler spectrum method and classic Z-IWC (radar reflectivity-ice water content) relationships; however, the former is a more reasonable method.
仲凌志刘黎平邓敏周秀骥
关键词:RADARCLOUD
自适应中值滤波在云雷达数据预处理的应用被引量:6
2012年
为了解决毫米波雷达回波噪声的污染,剔除Ka波段雷达探测数据中的散点噪声,得到雷达真实的探测大气云粒子回波,采用自适应滤波方法,改进并使其适用于Ka波段雷达资料的噪声剔除,同时进行了理论分析和实验论证。结果表明,相对于传统的中值滤波,自适应滤波具有明显的滤波性能,不仅可以剔除噪声,并有效地保留了雷达探测数据的局部细节。
王德旺王改利
关键词:激光技术信号处理毫米波雷达自适应滤波
Improvement of Radar Quantitative Precipitation Estimation Based on Real-Time Adjustments to Z-R Relationships and Inverse Distance Weighting Correction Schemes被引量:17
2012年
The errors in radar quantitative precipitation estimations consist not only of systematic biases caused by random noises but also spatially nonuniform biases in radar rainfall at individual rain-gauge stations. In this study, a real-time adjustment to the radar reflectivity rainfall rates (Z R) relationship scheme and the gauge-corrected, radar-based, estimation scheme with inverse distance weighting interpolation was devel- oped. Based on the characteristics of the two schemes, the two-step correction technique of radar quantitative precipitation estimation is proposed. To minimize the errors between radar quantitative precipitation es- timations and rain gauge observations, a real-time adjustment to the Z R relationship scheme is used to remove systematic bias on the time-domain. The gauge-corrected, radar-based, estimation scheme is then used to eliminate non-uniform errors in space. Based on radar data and rain gauge observations near the Huaihe River, the two-step correction technique was evaluated using two heavy-precipitation events. The results show that the proposed scheme improved not only in the underestimation of rainfall but also reduced the root-mean-square error and the mean relative error of radar-rain gauge pairs.
王改利刘黎平丁媛媛
雷达回波外推预报的误差分析被引量:16
2013年
基于天气雷达资料的外推预报是灾害天气临近预报的基础,选取4次强降水过程分析了外推预报的误差。主要分析方法包括3个步骤:(1)采用多尺度回波跟踪方法确定雷达回波的运动场;(2)采用半拉格朗日平流方案对雷达回波进行外推;(3)预报结果和观测结果进行对比。利用去相关时间方法分析了雷达回波的可预报性,利用预报技巧评分和相对绝对误差对外推预报的误差进行了定量分析。此外,还分析了外推预报的误差与尺度之间的关系,以及外推预报中的不确定因素——回波强度变化和回波运动场变化在预报误差中的相对重要性。这4次强降水过程的误差分析表明,预报误差随预报时效的变化基本上是以指数规律递减的,大尺度的降水系统对应较长的持续性,对于发展演变较快、尺度较小的风暴,其持续性较短。
王改利赵翠光刘黎平王红艳
关键词:可预报性
A Quality Assurance Procedure and Evaluation of Rainfall Estimates for C-Band Polarimetric Radar被引量:8
2012年
A mobile C-band dual polarimetric weather radar J type (PCDJ), which adopts simultaneous transmission and simultaneous reception (STSR) of horizontally and vertically polarized signals, was first developed in China in 2008. It was deployed in the radar observation plan in the South China Heavy Rainfall Experiment (SCHeREX) in the summer of 2008 and 2009, as well as in Tropical Western Pacific Ocean Observation Experiments and Research on the Predictability of High Impact Weather Events from 2008 to 2010 in China (TWPOR). Using the observation data collected in these experiments, the radar systematic error and its sources were analyzed in depth. Meanwhile an algorithm that can smooth differential propagation phase (~Dp) for estimating the high-resolution specific differential phase (KDP) was developed. After attenuation correction of reflectivity in horizontal polarization (ZH) and differential reflectivity (ZDR) of PCDJ radar by means of KDP, the data quality was improved significantly. Using quality-controlled radar data, quantitative rainfall estimation was performed, and the resutls were compared with rain-gauge measurements. A synthetic ZH /KDp-based method was analyzed. The results the traditional ZH-based method when the rain suggest that the synthetic method has the advantage over rate is 〉5 mm h^-1. The more intensive the rain rates, the higher accuracy of the estimation.
HU ZhiqunLIU LipingWANG Lirong
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