|
|||||
|
|
| 数值模式预报延迟量与GPS测量的比较研究 | |
| 引用本文： | 袁招洪,顾松山,丁金才.数值模式预报延迟量与GPS测量的比较研究[J].南京气象学院学报,2006,29(5):581-590. |
| 作者姓名： | 袁招洪 顾松山 丁金才 |
| 作者单位： | 1. 上海市气象局,上海,200030 2. 南京信息工程大学,电子工程系,江苏,南京,210044 3. 上海中心气象台,上海,200030 |
| 基金项目： | 国家科技部世博专项;上海市科委世博专项;中国科学院知识创新工程项目 |
| 摘 要： | 利用长江三角洲地区GPS观测网中4个站点的资料，研究了2002年梅雨期静力延迟和湿延迟的时、空变化，以上海宝山站为例用探空资料对GPS资料进行了验证，并将MM5模式24h的预报结果与GPS测量资料进行比较，以检验MM5模式对静力延迟和湿延迟的预报能力，在此基础上提出了订正模式预报静力延迟误差的方法。研究结果表明：GPS是一种与探空观测有可比性的大气静力延迟和湿延迟测量手段。GPS站点测得的静力延迟和湿延迟呈现出不同特征，静力延迟有明显的周期变化，湿延迟的变化与天气过程相关联。模式初始场对静力延迟有很好的描述能力，而对湿延迟却存在低估现象。MM5模式24h滚动预报基本能反映出静力延迟的日变化趋势，而模式在预报静力延迟的逐时次变化方面还存在一定的偏差。模式对湿延迟变化有一定的预报能力，但也存在低估现象。模式对总延迟的预报总体偏低，偏差主要集中在-3cm附近。可以通过订正地面气压的方法减小模式对静力延迟的预报误差。 |
| 关 键 词： | 中尺度数值预报 延迟量 比较 |
| 文章编号： | 1000-2022（2006）05-0581-10 |
| 收稿时间： | 08 19 2005 12:00AM |
| 修稿时间： | 2005-08-192005-12-05 |
Comparison of MM5 Model-Simulated and GPS-Observed Zenith Delay |
|
| YUAN Zhao-hong,GU Song-shan,DING Jin-cai.Comparison of MM5 Model-Simulated and GPS-Observed Zenith Delay[J].Journal of Nanjing Institute of Meteorology,2006,29(5):581-590. | |
| Authors: | YUAN Zhao-hong GU Song-shan DING Jin-cai |
| Institution: | 1. Shanghai Meteorological Bureau, Shangai 200030, China ; 2. Department of Electronic and Engineering,NUIST,Nanjing 210044,China; 3. Shanghai Weather Center,Slaanghai 200030, China |
| Abstract: | The GPS data at 4 sites of GPS network in the Yangtze delta is used to investigate the spatial and temporal distribution of Zenith Hydrostatic Delay(ZHD) and Zenith Wet Delay(ZWD) over the Meiyu period of 2002.Radiosonde observations from Baoshan site are used to estimate ZHD and ZWD to validate the GPS data,and the ZHD and ZWD estimated by MM5 24-hour simulation also compared with the GPS observations to validate the ability of the ZHD and ZWD prediction of MM5.Then,a method for correcting the simulation bias of ZHD of the model is introduced.The results show that GPS is an instrument for detecting atmospheric ZHD and ZWD with a detection accuracy comparable with radiosonde.The ZHD and ZWD from different GPS sites exhibit their individual features that ZHD has an obvious periodic change and ZWD is related to weather.The reanalysis fields of MM5 on the whole are able to reveal the distribution of ZHD,but usually has an underestimation of ZWD.The 24h-simulation of MM5 can show the change tendency of ZHD with a bias in depicting its diurnal varation.MM5 has also an ability of simulating ZWD on the whole with a bias of underestimation.The Zenith Total Delay(ZTD) is underestimated by MM5 simulation and the bias is around3cm,which can be reduced by means of correcting the surface pressure. |
| Keywords: | GPS |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |