摘要
COSMIC计划于2006年成功实施,该计划的设计寿命为5 a。由于实际运行期间COSMIC星座内卫星出现过技术故障,加上卫星姿态控制不稳定等原因,探测数据资料的质量存在一定的波动。为了对COSMIC掩星后期的数据质量进行评估,以全球无线电探空数据为参照,对COSMIC掩星折射率廓线数据进行了统计分析。分析结果表明:1)在两类观测资料观测时间和空间的配对标准上,随着时间差限值与距离差限值的增大,折射率的平均相对误差的变化趋势性不强,但相对误差标准偏差呈增加趋势。2)折射率偏差大值区集中在东南亚附近海域和墨西哥湾附近海域,在海陆交界处折射率平均相对误差要大于陆地和海洋上的平均相对误差。3)10 km以下,热带地区的正偏差最大,平均相对误差为0.849%,高于北半球的0.484%和南半球的0.492%。在10 km以上,三个区域平均相对误差的差异不明显。4)10 km以下,夏季折射率的平均相对误差最大,为0.663%;冬季折射率的平均相对误差最小,为0.365%;30—35 km冬季的平均相对误差最大,达到1.014%。
COSMIC was successfully launched in 2006,and its design life is 5 years. Factors such as technical faults during the practical operation along with instability of satellite attitude control,the quality of COSMIC occultation data is inconsistent during 2006—2011. In order to assess the quality of occultation data,data analysis has been done with the GPS occultation refractivity profile data using global radiosonde data as reference. The analysis results are as follows. 1） In term of time and space matching criteria in two kinds of observational data,with the limit values of time difference and the limit values of distance difference increases,there is no evident trend of the refractivity average relative error,but the increasing tendency of the standard deviation of the refractivity relative error is obvious. 2） The high value region of refractivity error happened in the waters near the Southeast Asia and the sea near the Gulf of Mexico. Compared to the refractivity average relative error on land or sea,the junction area of them has bigger error. 3） Below 10 km,the refractivity average relative error in tropical regions is 0. 849%,significantly larger than the 0. 484% in the northern hemisphere and the 0. 492% in the southern hemisphere.Above 10 km,the differences of average relative error of three areas have no notable difference. 4） Below10 km,the refractivity average relative error（ 0. 663%） is maximal in summer,and is minimal in winter（ 0. 365%）. But the refractivity average relative error is maximal in winter between 30—35 km,reached1. 014%.
作者
赵定池
潘晓滨
晋鹏
黑飞
钟俊杰
熊光洁
Zhao Dingchi Pan Xiaobin Jin Peng Hei Fei Zhong Junjie Xiong Guangjie(No. 75839 Troops of PLA, Guangzhou 510510, China School of Meteorology and Oceanography of PLA University of Science and Technology, Nanjing 211101 , China)
出处
《气象与环境科学》
2016年第4期30-37,共8页
Meteorological and Environmental Sciences
基金
国家自然科学基金项目(41275128)资助
关键词
COSMIC掩星
折射率
误差特性
COSMIC occultation data
refractivity
error characteristics
