Articles | Volume 24, issue 2
https://doi.org/10.5194/acp-24-1213-2024
https://doi.org/10.5194/acp-24-1213-2024
Research article
 | 
29 Jan 2024
Research article |  | 29 Jan 2024

Radiative effect of thin cirrus clouds in the extratropical lowermost stratosphere and tropopause region

Reinhold Spang, Rolf Müller, and Alexandru Rap

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This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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Cited articles

Avery, M., Winker, D., Heymsfield, A., Vaughan, M., Young, S., Hu, Y., and Trepte, C.: Cloud ice water content retrieved from the CALIOP space-based lidar, Geophys. Res. Lett., 39, L05808, https://doi.org/10.1029/2011GL050545, 2012. a
Balmes, K. A. and Fu, Q.: An Investigation of Optically Very Thin Ice Clouds from Ground-Based ARM Raman Lidars, Atmosphere, 9, 445, https://doi.org/10.3390/atmos9110445, 2018. a, b, c
Baran, A. J.: Simulation of infrared scattering from ice aggregates by use of a size-shape distribution of circular ice cylinders, Appl. Optics, 42, 2811–2818, https://doi.org/10.1364/AO.42.002811, 2003. a, b
Baran, A. J. and Francis, P. N.: On the radiative properties of cirrus cloud at solar and thermal wavelengths: A test of model consistency using high-resolution airborne radiance measurements, Q. J. Roy. Meteor. Soc., 130, 763–778, https://doi.org/10.1256/qj.03.151, 2004. a
Baran, A. J., Havemann, S., and Mackowski, D.: A database of hexagonal column optical properties for wavelengths ranging between 0.2 microns to 30  microns, produced for ANNEX 7. Contract No. 4b/3/02, DEFRA, UK, 2001. a
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Short summary
Cirrus clouds play an important role in the radiation budget of the Earth. Despite recent progress in their observation, the radiative impact of ultra-thin cirrus clouds (UTC) in the tropopause region and in the lowermost stratosphere remains poorly constrained. Sensitivity model simulations with different ice parameters provide an uncertainty range for the radiative effect of UTCs. There is a need for better observed UTCs to enable the simulation of their potentially large effect on climate.
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