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| 利用COSMIC掩星资料计算平流层大气风场方法分析 | |
| 引用本文： | 肖卫华,符养,杜晓勇,高太长.利用COSMIC掩星资料计算平流层大气风场方法分析[J].武汉大学学报(信息科学版),2012,37(2):199-204,253,254. |
| 作者姓名： | 肖卫华 符养 杜晓勇 高太长 |
| 作者单位： | 1. 解放军理工大学气象学院,南京市双龙街60号211101／北京应用气象研究所,北京市民族园路8号100029 2. 北京应用气象研究所,北京市民族园路8号,100029 3. 解放军理工大学气象学院,南京市双龙街60号,211101 |
| 基金项目： | 中国博士后科学基金资助项目 |
| 摘 要： | 利用大气压强、温度、密度等与风场之间的关系,通过大气折射指数、高度及温度数据均可以推算出大气风场,选用2007年1、4、7和10月COSMIC掩星观测的压强和折射率、高度、温度等月平均数据,构建了三种推算大气风场的方法。从风场的纬度高度分布、经度纬度分布及纬圈平均纬向风在不同季节的特性等方面,将计算结果与ECMWF ERA-interim再分析风场结果进行对比,发现计算结果与模式风场基本一致,能够反映出中高纬度大气风场的变化规律,偏差随高度的增高而逐渐增大,1hPa等压面以下偏差在10m/s以内。采用不同掩星数据推算出的大气风场之间的彼此差别很小,折射率与温度资料推算的大气风场几乎相同,高度数据推算出的风场相对前两者偏差稍大,但一般不超过2m/s。 |
| 关 键 词： | 平流层 大气平均风场 COSMIC掩星 ECMWF |
Analysis of Deriving Stratospheric Atmospheric Winds from COSMIC Radio Occultation Data |
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| XIAO Weihua,FU Yang,DU Xiaoyong,GAO Taichang.Analysis of Deriving Stratospheric Atmospheric Winds from COSMIC Radio Occultation Data[J].Geomatics and Information Science of Wuhan University,2012,37(2):199-204,253,254. | |
| Authors: | XIAO Weihua FU Yang DU Xiaoyong GAO Taichang |
| Institution: | 1(1 Institute of Meteorology,PLA Univ of Sci & Tech,60 Shuanglong Street,Nanjing 211101,China)(2 Beijing Institute of Applied Meteorology,8 Minzuyuan Road,Beijing 100029,China) |
| Abstract: | Three different calculation methods are constructed with the newly launched COSMIC/ FORMOSAT-3 system.The analysis is based on the radio occultation data sample collected the observation during Jan.,Apr.,July and Oct.2007.For the validation,the data is compared with monthly average wind data of ECMWF’s ERA-interim data sets.The comparisons are done in terms of mean winds profiles for various latitudes,longitudinal-latitudinal winds variations for particular pressure level and latitude-height distributions of zonal mean winds for different seasons,and reveal excellent resemblance between the COSMIC measurements and the model outputs in stratosphere.The bias is larger in upper stratosphere than in lower stratosphere,however,the error is less than 10 m/s below 1 hPa.The differences of the three calculated winds field are very small,the winds field derived from refractive index and temperature data is nearly the same,the bias of winds derived from height is relatively larger,but the differences of error is less than 2 m/s than the two fields infered before. |
| Keywords: | stratosphere mean winds field COSMIC occultation ECMWF |
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