Climatology of Mesosphere and Lower Thermosphere Residual Circulations and Mesopause Height Derived From SABER Observations.

Autor: Wang N; Center for Atmospheric Sciences Hampton University Hampton VA USA., Qian L; High Altitude Observatory National Center for Atmospheric Research Boulder CO USA., Yue J; Catholic University of America Washington DC USA.; NASA Goddard Space Flight Center Greenbelt MD USA., Wang W; High Altitude Observatory National Center for Atmospheric Research Boulder CO USA., Mlynczak MG; NASA Langley Research Center Hampton VA USA., Russell JM 3rd; Center for Atmospheric Sciences Hampton University Hampton VA USA.
Jazyk: angličtina
Zdroj: Journal of geophysical research. Atmospheres : JGR [J Geophys Res Atmos] 2022 Feb 27; Vol. 127 (4), pp. e2021JD035666. Date of Electronic Publication: 2022 Feb 22.
DOI: 10.1029/2021JD035666
Abstrakt: In the mesosphere and lower thermosphere (MLT) region, residual circulations driven by gravity wave breaking and dissipation significantly impact constituent distribution and the height and temperature of the mesopause. The distribution of CO 2 can be used as a proxy for the residual circulations. Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) CO 2 volume mixing ratio (VMR) and temperature measurements from 2003 to 2020 are used to study the monthly climatology of MLT residual circulations and the mesopause height. Our analyses show that (a) mesopause height strongly correlates with the CO 2 VMR vertical gradient during solstices; (b) mesopause height has a discontinuity at midlatitude in the summer hemisphere, with a lower mesopause height at mid-to-high latitudes as a result of adiabatic cooling driven by strong adiabatic upwelling; (c) the residual circulations have strong seasonal variations at mid-to-high latitudes, but they are more uniform at low latitudes; and (d) the interannual variability of the residual circulations and mesopause height is larger in the Southern Hemisphere (SH; 4-5 km) than in the Northern Hemisphere (NH; 0.5-1 km).
(© 2022. The Authors.)
Databáze: MEDLINE
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