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TIMED/SABER observations of lower mesospheric inversion layers at low and middle latitudes
Gan, Quan; Zhang, Shao Dong; Yi, Fan; Gan, Q (reprint author), Wuhan Univ, Sch Elect Informat, Wuhan 430072, Hubei, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
2012
Volume117Pages:D07109
ISSN2169-897X
Language英语
AbstractWe present the global distribution, seasonal, and interannual variations of the lower mesospheric inversion layers (MILs) using SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) temperature data. We show that both the characteristics and the formation mechanisms of large spatiotemporal-scale lower MILs are latitude dependent. At low latitudes, the monthly zonal mean amplitude of the lower MILs exhibits a semi-annual cycle and reaches a maximum of similar to 40 K in spring and a secondary maximum of similar to 30 K in autumn. On the equator, the semi-annual oscillations in the background and diurnal-migrating-tide temperatures could contribute more than 12 and 25 K, respectively, suggesting they are the key causes of large spatiotemporal-scale lower MILs at low latitudes. At middle latitudes, the monthly zonal mean amplitude of the lower MILs exhibits an annual cycle with its maximum in the range 24-33 K in winter. In addition, their longitudinal distribution and daily variation in winter are closely correlated with the transient structure of a composite wave composed of stationary and westward-propagating quasi-16-day planetary waves with zonal wave number 1. The correlation coefficient between the lower MILs and the composite wave can sometimes reach unity. The composite planetary wave could contribute temperature enhancements of at least 15-20 K to the lower MILs. Thus, we believe that the transient structure of planetary waves is also an important cause of the large spatiotemporal-scale lower MILs in winter at middle latitudes, in addition to previously proposed mechanisms.; We present the global distribution, seasonal, and interannual variations of the lower mesospheric inversion layers (MILs) using SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) temperature data. We show that both the characteristics and the formation mechanisms of large spatiotemporal-scale lower MILs are latitude dependent. At low latitudes, the monthly zonal mean amplitude of the lower MILs exhibits a semi-annual cycle and reaches a maximum of similar to 40 K in spring and a secondary maximum of similar to 30 K in autumn. On the equator, the semi-annual oscillations in the background and diurnal-migrating-tide temperatures could contribute more than 12 and 25 K, respectively, suggesting they are the key causes of large spatiotemporal-scale lower MILs at low latitudes. At middle latitudes, the monthly zonal mean amplitude of the lower MILs exhibits an annual cycle with its maximum in the range 24-33 K in winter. In addition, their longitudinal distribution and daily variation in winter are closely correlated with the transient structure of a composite wave composed of stationary and westward-propagating quasi-16-day planetary waves with zonal wave number 1. The correlation coefficient between the lower MILs and the composite wave can sometimes reach unity. The composite planetary wave could contribute temperature enhancements of at least 15-20 K to the lower MILs. Thus, we believe that the transient structure of planetary waves is also an important cause of the large spatiotemporal-scale lower MILs in winter at middle latitudes, in addition to previously proposed mechanisms.
Indexed BySCI ; EI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3287
Collection空间科学部
Corresponding AuthorGan, Q (reprint author), Wuhan Univ, Sch Elect Informat, Wuhan 430072, Hubei, Peoples R China.
Recommended Citation
GB/T 7714
Gan, Quan,Zhang, Shao Dong,Yi, Fan,et al. TIMED/SABER observations of lower mesospheric inversion layers at low and middle latitudes[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2012,117:D07109.
APA Gan, Quan,Zhang, Shao Dong,Yi, Fan,&Gan, Q .(2012).TIMED/SABER observations of lower mesospheric inversion layers at low and middle latitudes.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,117,D07109.
MLA Gan, Quan,et al."TIMED/SABER observations of lower mesospheric inversion layers at low and middle latitudes".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 117(2012):D07109.
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