Physics in the mesosphere/lower thermosphere: A personal perspective

Lübken, Franz‐Josef

doi:10.3389/fspas.2022.1000766

Cited by 2 publications

(3 citation statements)

References 49 publications

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“…This results in substantial effects on the local HO x and O x chemistry (Murray and Plane, 2005;Siskind et al, 2018). Lübken (2022) suggests additional effects in other parts of the middle atmosphere, as absorption of solar ultraviolet radiation by NLCs may lead to changes in photochemical processes at lower altitudes.…”

Section: Trends In Mesospheric Cloudsmentioning

confidence: 99%

Opinion: Recent developments and future directions in studying the mesosphere and lower thermosphere

Plane,

Gumbel,

Kalogerakis

et al. 2023

Atmos. Chem. Phys.

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Abstract. This article begins with a review of important advances in the chemistry and related physics of the mesosphere and lower thermosphere (MLT) region of the atmosphere that have occurred over the past 2 decades, since the founding of Atmospheric Chemistry and Physics. The emphasis here is on chemistry, but we also discuss recent findings on atmospheric dynamics and forcings to the extent that these are important for understanding MLT composition and chemistry. Topics that are covered include observations, with satellite, rocket and ground-based techniques; the variability and connectedness of the MLT on various length scales and timescales; airglow emissions; the cosmic dust input and meteoric metal layers; and noctilucent/polar mesospheric ice clouds. The paper then concludes with a discussion of important unanswered questions and likely future directions for the field over the next decade.

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Section: Trends In Mesospheric Cloudsmentioning

confidence: 99%

Opinion: Recent developments and future directions in studying the mesosphere and lower thermosphere

Plane,

Gumbel,

Kalogerakis

et al. 2023

Atmos. Chem. Phys.

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“…The region comprising the mesosphere and the lower thermosphere (MLT, located between 50 and 150 km), remains the least known of the atmosphere, due to a lack of observations and knowledge of vertical dynamic coupling [1]. Our current knowledge of stratosphere-troposphere coupling processes and fine-scale numerical modeling in the lower atmosphere allows the inclusion of the stratosphere in meteorological models, thereby improving the Brewer-Dobson circulation, winds near the tropopause, the representation of the quasi-biennial oscillation (QBO) in the equatorial region [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the simulation of MILs with WACCM, France et al [29] pointed at either a warm bias in the mesosphere or a too-large planetary wave activity to explain an overestimation of MIL occurrences within WACCM. Discrepancies between observations and modeling in the upper atmosphere are also a motivation to investigate the physical reasons and to improve climate models [1]. on 11 April 2023) and stored at LATMOS (UMR 8190).…”

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confidence: 99%

Case Study of a Mesospheric Temperature Inversion over Maïdo Observatory through a Multi-Instrumental Observation

et al. 2023

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The dynamic vertical coupling in the middle and lower thermosphere (MLT) is documented over the Maïdo observatory at La Réunion island (21°S, 55°E). The investigation uses data obtained in the framework of the Atmospheric dynamics Research InfraStructure in Europe (ARISE) project. In particular, Rayleigh lidar and nightglow measurements combined with other observations and modeling provide information on a mesospheric inversion layer (MIL) and the related gravity waves (GWs) on 9 and 10 October 2017. A Rossby wave breaking (RWB) produced instabilities in the sheared background wind and a strong tropospheric activity of GWs on 9–11 October above La Réunion. The MIL was observed on the night of 9 October when a large amount of tropospheric GWs propagated upward into the middle atmosphere and disappeared on 11 October when the stratospheric zonal wind filtering became a significant blocking. Among other results, dominant mesospheric GW modes with vertical wavelengths of about 4–6 km and 10–13 km can be traced down to the troposphere and up to the mesopause. Dominant GWs with a wavelength of ~2–3 km and 6 km also propagated upward and eastward from the tropospheric source into the stratosphere on 9–11 October. Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature and OH profiles indicate that GW activity in the middle atmosphere affects the upper atmosphere with waves breaking at heights below the MIL and in the mesopause. Several techniques are illustrated on nightglow images to access GW activity and spectral characteristics at the mesopause for high and low frequency GWs on the nights of 9–10 October. In conclusion, intense tropospheric activity of GWs induced by RWB events can be linked with MILs at the subtropical barrier in the South-West Indian Ocean during austral winter.

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Physics in the mesosphere/lower thermosphere: A personal perspective

Cited by 2 publications

References 49 publications

Opinion: Recent developments and future directions in studying the mesosphere and lower thermosphere

Opinion: Recent developments and future directions in studying the mesosphere and lower thermosphere

Case Study of a Mesospheric Temperature Inversion over Maïdo Observatory through a Multi-Instrumental Observation

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