论文摘要
Reconciling upper-air temperature trends derived from radiosonde and satellite observations is a necessary step to confidently determine the global warming rate. This study examines the raw and homogenized radiosonde observations over China and compares them with layer-mean atmospheric temperatures derived from satellite microwave observations for the lower-troposphere（TLT）, mid-troposphere（TMT）, upper-troposphere（TUT）, and lower-stratosphere（TLS） by three research groups. Comparisons are for averages over China, excluding the Tibetan Plateau, and at individual stations where metadata contain information on radiosonde instrument changes. It is found that major differences between the satellite and radiosonde observations are related to artificial systematic changes. The radiosonde system updates in the early 2000 s over China caused significant discontinuities and led the radiosonde temperature trends to exhibit less warming in the middle and upper troposphere and more cooling in the lower stratosphere than satellite temperatures. Homogenized radiosonde data have been further adjusted by using the shift-point adjustment approaches to match with satellite products for China averages. The obtained trends during 1979–2015 from the re-adjusted radiosonde observation are respectively 0.203 ± 0.066, 0.128 ± 0.044, 0.034 ± 0.039, and –0.329 ± 0.135 K decade–1 for TLT, TMT, TUT, and TLS equivalents. Compared to satellite trends, the re-adjusted radiosonde trends are within 0.01 K decade–1 for TMT and TUT, 0.054 K decade–1 warmer for TLT, and 0.051 K decade–1 cooler for TLS. The results suggest that the use of satellite data as a reference is helpful in identifying and removing inhomogeneities of radiosonde temperatures over China and reconciling their trends to satellite microwave observations. Future efforts are to homogenize radiosonde temperatures at individual stations over China by using similar approaches.
论文目录
文章来源
类型: 期刊论文
作者: Yanjun GUO,Chengzhi ZOU,Panmao ZHAI,Guofu WANG
来源: Journal of Meteorological Research 2019年02期
年度: 2019
分类: 基础科学
专业: 气象学
单位: National Climate Center China Meteorological Administration,Center for Satellite Applications and Research, National Oceanic and Atmospheric Administration/National Environmental Satellite, Data, and Information Service,Chinese Academy of Meteorolgical Sciences China Meteorological Administration
基金: Supported by the National Key Research and Development Progtam of China(2018YFC1509002 and 2016YFA0600301-05),China Meteorological Administration Special Public Welfare Research Fund(GYHY201406017,GYHY201506002,and GYHY201506019),National Natural Science Foundation of China(41675094 and 41775082),Climate Change Special Fund of China Meteorological Administration(CCSF201803)
分类号: P412.27
页码: 289-306
总页数: 18
文件大小: 2539K
下载量: 14
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