Lower-mesospheric inversion layers over brazilian equatorial region using TIMED/SABER temperature profiles |
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| Authors: | J Fechine CM Wrasse H Takahashi MG Mlynczak JM Russell |
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| Institution: | 1. Instituto Nacional de Pesquisas Espaciais (INPE), Zip Code: 12.227-010, São José dos Campos, SP, Brazil;2. Atmospheric Sciences Division, NASA Langley Research Center, Hampton, VA, USA;3. Center for Atmospheric Sciences, Hampton University, Hampton, VA, USA;4. Instituto de Pesquisa e Desenvolvimento – Universidade do Vale do Para?´ba (UNIVAP/IP&D), São José dos Campos, SP, Brazil |
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| Abstract: | Lower-mesospheric inversion layers (MILs) were studied using the temperature profiles observed by TIMED/SABER over Cariri (7.5°S, 36.5°W), Brazil, in 2005. A total 175 MILs were identified with the maximum occurrence in April and October and the minimum in January and July. The lower MIL is located in a height region from 70 to 90 km, with the peak at around 83 ± 4 km with the temperature of 205 ± 5 K, and the thickness of 4–10 km. The results show large amplitudes of MILs during equinoxes and minimum in solstices, with a clear semiannual variation. A general feature of lower MIL in monthly mean profile was observed twice a year, one from February to May, and the other from August to October with a downward shift of the top level. These results suggest that formation and long persistence of MIL is an important factor to investigate propagation of atmospheric gravity waves in the mesosphere-lower thermosphere (MLT) region. |
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| Keywords: | Mesospheric inversion layer Atmospheric thermal structure Middle atmosphere Remote sensing |
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