Articles | Volume 41, issue 2
Regular paper
24 Jul 2023
Regular paper |  | 24 Jul 2023

Greenhouse gas effects on the solar cycle response of water vapour and noctilucent clouds

Ashique Vellalassery, Gerd Baumgarten, Mykhaylo Grygalashvyly, and Franz-Josef Lübken

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Cited articles

Bardeen, C. G., Toon, O. B., Jensen, E. J., Harvig, M. E., Randall, C. E., Benze, S., Marsh, D. R., and Merkel, A.: Numerical simulations of the three‐dimensional distribution of polar mesospheric clouds and comparisons with Cloud Imaging and Particle Size (CIPS) experiment and the Solar Occultation For Ice Experiment (SOFIE) observations, J. Geophy. Res., 115, D10204,, 2010. 
Berger, U. and Lübken, F. J.: Mesospheric temperature trends at mid-latitudes in summer, Geophys. Res. Lett., 38, L22804,, 2011. 
Berger, U. and Lübken, F. J.: Trends in mesospheric ice layers in the Northern Hemisphere during 1961–2013, J. Geophys. Res., 120, 11277–11298,, 2015. 
Berger, U. and von Zahn, U.: Icy particles in the summer mesopause region: Three-dimensional modeling of their environment and two-dimensional modeling of their transport, J. Geophys. Res.-Space, 107, SIA 10-1–SIA 10-32,, 2002. 
Berger, U.: Modeling of middle atmosphere dynamics with LIMA, J. Atmos. Sol.-Terr. Phys., 70, 1170–1200,, 2008. 
Short summary
The solar cycle affects the H2O concentration in the upper mesosphere mainly in two ways: directly through photolysis and, at the time and place of NLC formation, indirectly through temperature changes. The H2O–Lyman-α response is modified by NLC formation, resulting in a positive response at the ice formation region (due to the temperature change effect on the ice formation rate) and a negative response at the sublimation zone (due to the photolysis effect).