Near-Global Occurrences of Mesospheric Inversion Layers Observed from 22 Years of TIMED/SABER Temperature Measurements.
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| Title: | Near-Global Occurrences of Mesospheric Inversion Layers Observed from 22 Years of TIMED/SABER Temperature Measurements. |
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| Authors: | Ayorinde, Toyese Tunde1 (AUTHOR) toyese.ayorinde@inpe.br, Wrasse, Cristiano Max1 (AUTHOR), Agyei-Yeboah, Ebenezer2 (AUTHOR), Takahashi, Hisao1 (AUTHOR), Figueiredo, Cosme Alexandre Oliveira Barros3 (AUTHOR), Barros, Diego1 (AUTHOR), Bilibio, Anderson Vestena1 (AUTHOR), Vital, Luiz Fillip Rodrigues1 (AUTHOR) |
| Source: | Journal of Climate. Feb2026, Vol. 39 Issue 3, p903-923. 21p. |
| Subjects: | Atmospheric waves, Temperature inversions, Geography, El Niño, Solar cycle, Quasi-biennial oscillation (Meteorology), Temperature measurements |
| Abstract: | The long-term occurrence of mesospheric inversion layers (MILs) was analyzed using 22 years (2002–23) of Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature data. The two types of MILs considered are those caused by dissipating waves and those caused by nondissipating waves. We examined MIL occurrence near-globally, monthly, and latitudinally, applying multiple linear regression (MLR) to assess trends and responses to El Niño–Southern Oscillation (ENSO), quasi-biennial oscillation (QBO), and solar flux (F10.7cm). MIL parameters (top/base heights and temperatures, height/temperature variations) exhibit clear hemispherical asymmetry. In general, MIL occurrences peak during equinoxes and decline during solstices. Latitudinally, tropical regions (30°N–30°S) show the highest MIL occurrences during equinoxes and the lowest ML occurrences during solstices. In midlatitudes and polar regions (30°–83°N/S), MILs peak in autumn and winter, with a minimum in spring and summer. Periodicities in MIL occurrences vary near-globally and by latitude. The tropics feature not only the smallest mean thickness variation (∼0.61 km) but also the largest mean temperature amplitude variation (∼23.72 K). The latitudinal patterns may reflect seasonal variations in dynamics that have a stronger influence on temperature inversions than on the vertical distributions in the mesosphere. Over 22 years, the analysis revealed a near-global MIL occurrence ratio increase of approximately 0.055% ± 0.016% yr−1, with the 11-yr solar cycle exerting significant control. The observed negative correlation with ENSO and positive correlation with QBO likely reflect their influence on atmospheric wave propagation and circulation, which indirectly modulates MIL formation. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The long-term occurrence of mesospheric inversion layers (MILs) was analyzed using 22 years (2002–23) of Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature data. The two types of MILs considered are those caused by dissipating waves and those caused by nondissipating waves. We examined MIL occurrence near-globally, monthly, and latitudinally, applying multiple linear regression (MLR) to assess trends and responses to El Niño–Southern Oscillation (ENSO), quasi-biennial oscillation (QBO), and solar flux (F10.7cm). MIL parameters (top/base heights and temperatures, height/temperature variations) exhibit clear hemispherical asymmetry. In general, MIL occurrences peak during equinoxes and decline during solstices. Latitudinally, tropical regions (30°N–30°S) show the highest MIL occurrences during equinoxes and the lowest ML occurrences during solstices. In midlatitudes and polar regions (30°–83°N/S), MILs peak in autumn and winter, with a minimum in spring and summer. Periodicities in MIL occurrences vary near-globally and by latitude. The tropics feature not only the smallest mean thickness variation (∼0.61 km) but also the largest mean temperature amplitude variation (∼23.72 K). The latitudinal patterns may reflect seasonal variations in dynamics that have a stronger influence on temperature inversions than on the vertical distributions in the mesosphere. Over 22 years, the analysis revealed a near-global MIL occurrence ratio increase of approximately 0.055% ± 0.016% yr−1, with the 11-yr solar cycle exerting significant control. The observed negative correlation with ENSO and positive correlation with QBO likely reflect their influence on atmospheric wave propagation and circulation, which indirectly modulates MIL formation. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 08948755 |
| DOI: | 10.1175/JCLI-D-25-0140.1 |
