摘要
COSMIC(Constellation Observation System for Meteorology,Ionosphere and Climate)每天可以提供全球2000～3000条从40 km高空到近地面的大气温、压、湿的廓线资料,有效地弥补了常规探空资料在时间和空间上分辨率的不足。通过对2008年5月20日至2008年11月26日COSMIC资料与L波段探空秒数据进行比对,结果表明,在10 km高度以下,COSMIC反演的湿廓线资料与L波段探空数据偏差较小,温度偏差为-0.5℃,均方根误差为1.5℃;折射率偏差为1.4N,均方根误差为5.9N;气压偏差为2.0 hPa,均方根误差为4.7 hPa;水汽压偏差为0.1 hPa,均方根误差为1.1 hPa。COSMIC干廓线资料与L波段探空相比,在10～30 km高度内,温度偏差为-0.3℃,均方根误差为1.9℃;折射率偏差为0.4N,均方根误差为0.9N;气压偏差为1.4 hPa,均方根误差为2.6 hPa。表明COSMIC资料既具有较高的时空分辨率,又具有较好的精度,在数值模式中具有重要的潜在应用。
COSMIC（Constellation Observation System for Meteorology,Ionosphere and Climate）,a spacebased GPS constellation observing system of six low-earth-orbit satellites,provides approximately 2000 to 3000 profiles of atmospheric temperature,pressure,humidity from 40 km to the ground each day,and greatly enhances the atmospheric observation in spatial and temporal resolution.To evaluate the accuracy, the COSMIC observations were compared with the L band radiosonde from May 20 to November 26,2008. The comparison of the wet profiles below 10 km showed that the deviation is -0.5℃for temperature, 1.4N for refractivity index,2.0 hPa for pressure,0.1 hPa for vapor pressure;while their root mean square errors（RMS） are 1.5℃,5.9N,4.7 hPa,1.1 hPa,respectively.As for the dry profiles,between 10 km and 30 km,the deviations are -0.3℃in temperature,0.4N in refractivity index,1.4 hPa in vapor pressure,while the RMSs are 1.9℃,0.9N and 2.6 hPa,respectively,which implies their potential applications in numerical weather prediction owing to the high spatial and temporal resolution and high accuracy.
出处
《气象》
CSCD
北大核心
2010年第9期14-20,共7页
Meteorological Monthly
基金
国家气象中心"面向业务数值预报的重点资料关键应用技术研究(GYHY200806003)"
气象探测中心"地基遥感与雷达定量测量降水实验"资助
关键词
COSMIC
探空
误差分析
同化
COSMIC
L band radiosonde
error analysis
assimilation
