TIMED/SABER observations of lower mesospheric inversion layers at low and middle latitudes
文献类型：期刊论文
| 作者 | Gan, Quan; Zhang, Shao Dong; Yi, Fan |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
 |
| 出版日期 | 2012 |
| 卷号 | 117页码:D07109 |
| ISSN号 | 2169-897X |
| 通讯作者 | Gan, Q (reprint author), Wuhan Univ, Sch Elect Informat, Wuhan 430072, Hubei, Peoples R China. |
| 中文摘要 | 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. |
| 英文摘要 | 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. |
| 学科主题 | 空间物理 |
| 收录类别 | SCI ; EI |
| 资助信息 | National Natural Science Foundation of China [40825013, 40731055, 40974082]; National Basic Research Program of China [2012CB825605]; State Oceanic Administration of the People's Republic of China [201005017]; China Meteorological Administration [GYHY201106011]; State Key Laboratory of Space Weather; Fundamental Research Funds for the Central Universities |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3287]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Gan, Quan,Zhang, Shao Dong,Yi, Fan. 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.(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. |
入库方式： OAI收割
来源：国家空间科学中心
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