WANG Xu,CHEN Hua,HAO Yi-tian,et al.Identification of Bright-band in Nyingchi[J].Journal of Chengdu University of Information Technology,2017,(02):128-133.[doi:10.16836/j.cnki.jcuit.2017.02.004]
西藏林芝地区零度层亮带识别
- Title:
- Identification of Bright-band in Nyingchi
- 文章编号:
- 2096-1618(2017)02-0128-06
- 分类号:
- TN959.4
- 文献标志码:
- A
- 摘要:
- 西藏林芝地区地形复杂,雷达站周边群山环绕,导致了严重的雷达回波遮挡。林芝的新一代天气雷达是国内遮挡最严重的站点之一。在林芝CINRAD/CD雷达数据遮挡严重的情况下,结合该雷达的遮挡情况,通过计算某一高度所有无遮挡区方位的平均反射率因子获取垂直廓线的方法,得到零度层亮带的底高、顶高和峰值高度。为了交叉验证,提取同时刻的Ka波段全固态测云雷达数据,使用分级逐库订正法进行衰减订正,然后识别亮带所在位置并计算亮带参数。最后,将两部雷达的识别结果与最临近时刻探空数据的0 ℃层高度进行对比分析。结果表明:两部雷达都能有效识别亮带所在位置,且与其他低海拔地区相比,林芝地区的零度层亮带高度更接近于零度层高度,且其厚度较小。
- Abstract:
- Complex terrain around the radar station will seriously block the radar echo. New generation of weather radarlocated in Nyingchi, Tibet is one of the most blocked radar sites in China. Based on the volume radar data obtained from the new generation weather radar in Nyingchi area(CINRAD-CD), the vertical profile of the average reflectivityfactor is calculated at the unblocked azimuth. According to the vertical reflectivity factor profile of bright-band, the macrophysics parameters such as the top height, the bottom heightand the peak height the bright-band are calculated. For cross validation, the vertical reflectivity factor data of Karadar are extracted, the correction of attenuated reflectivity factor is firstly carried out with the method of bin-by-bin correction in the groups,and the corresponding macrophysics parameters of the bright-band are also calculated. Finally, the bright-band identification of the two kinds of radar are validated through temperature profile captured with radiosonde at the closest time. The results show that two radars are able to consistently identify the bright-band, and different from other low altitude areas, the bright-band peak height of Nyingchi is more closer to the height of 0℃ isotherm, and its thickness is smaller.
参考文献/References:
[1] 庄薇.青藏高原复杂地形雷达估测降水关键方法研究[D].北京:中国气象科学研究院,2013.
[2] 孙赫敏.青藏高原复杂地形雷达估测降水关键方法研究[D].北京:中国气象科学研究院,2013.
[3] 谢丽萍,王德旺,黄宁立,等.基于云雷达的大气0 ℃层亮带识别[J].干旱气象,2016,34(3):472-480.
[4] 张培昌,杜秉玉,戴铁丕.雷达气象学[M].北京:气象出版社,2001:306.
[5] 李艳芳.基于雷达资料质量控制的降水估测及外推预报[D].南京:南京信息工程大学,2013.
[6] Andrieu H,Creutin J D.Identification of Vertical Profiles of Radar Reflectivity for Hydrological Applications Using an Inverse Method,Part I:Formulation[J].Journal of Applied Meteorology,1995,34:225-239.
[7] 张乐坚,程明虎,陶岚.CINRAD-SA/B零度层亮带识别方法[J].应用气象学报,2010,21(2):171-179.
[8] 肖艳姣,刘黎平,李中华,等.雷达反射率因子数据中的亮带自动识别和抑制[J].高原气象,2010,219(1):197-205.
[9] 庄薇,刘黎平,余燕群,等.雷达地物回波模糊逻辑识别法的改进及效果检验[J].气象学报,2012,70(3):576-584.
[10] 庄薇,刘黎平,胡志群,等.青藏高原零度层亮带的识别订正方法及在雷达估测降水中的应用[J].气象,2013,(8):1004-1013.
[11] Zhang J,Langston C,Howard K.Bright Band Identification Based on Vertical Profiles of Radar Reflectivity form the WSR-88D[J].Journal of Atmospheric and Oceanic Technology,2008,25(10):1859-1872.
[12] 黄兴友,樊雅文,李峰,等.地基35 GHz测云雷达回波强度的衰减订正研究[J].红外与毫米波学报,2013,32(4):325-330.
[13] 张培昌,王振会.天气雷达回波衰减订正算法的研究(I):理论分析[J].高原气象,2001,20(1):1-5.
[14] 王传志,侯小宇,李学华,等.基于分级逐库方法的KA波段云雷达反射率因子衰减订正[J].成都信息工程大学学报,2016,31(4):358-362.
[15] 刘黎平,仲凌志,江源.毫米波测云雷达系统及其外场实验结果初步分析[J],气象科技,2009,37(5):567-571.
[16] 王德旺,刘黎平,仲凌志,等.毫米波雷达资料融化层亮带特征的分析及识别[J].气象,2012,38(6):712-721.
备注/Memo
收稿日期:2017-01-08 基金项目:四川省教育厅资助项目(15CZ0020,16ZA0209); 四川省科技厅资助项目(2016JY0106); 中国气象科学研究院灾害天气国家重点实验室开放课题面上资助项目(2015LASW-B06); 国家级大学生创新创业训练计划资助项目(201610621039)