Articles | Volume 21, issue 8
Atmos. Chem. Phys., 21, 6347–6364, 2021

Special issue: Arctic mixed-phase clouds as studied during the ACLOUD/PASCAL...

Atmos. Chem. Phys., 21, 6347–6364, 2021
Research article
27 Apr 2021
Research article | 27 Apr 2021

Case study of a humidity layer above Arctic stratocumulus and potential turbulent coupling with the cloud top

Ulrike Egerer et al.

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Subject: Clouds and Precipitation | Research Activity: Field Measurements | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
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Cited articles

Albrecht, B. A., Penc, R. S., and Schubert, W. H.: An Observational Study of Cloud-Topped Mixed Layers, J. Atmos. Sci., 42, 800–822,<0800:AOSOCT>2.0.CO;2, 1985. a
Brooks, I. M., Tjernström, M., Persson, P. O. G., Shupe, M. D., Atkinson, R. A., Canut, G., Birch, C. E., Mauritsen, T., Sedlar, J., and Brooks, B. J.: The Turbulent Structure of the Arctic Summer Boundary Layer During The Arctic Summer Cloud-Ocean Study, J. Geophys. Res.-Atmos., 122, 9685–9704,, 2017. a
Brunke, M. A., Stegall, S. T., and Zeng, X.: A climatology of tropospheric humidity inversions in five reanalyses, Atmos. Res., 153, 165–187,, 2015. a
Bruun, H. H.: Hot-Wire Anemometry, Oxford University Press, Oxford, UK, 1995. a
Bühl, J., Ansmann, A., Seifert, P., Baars, H., and Engelmann, R.: Toward a quantitative characterization of heterogeneous ice formation with lidar/radar: Comparison of CALIPSO/CloudSat with ground-based observations, Geophys. Res. Lett., 40, 4404–4408,, 2013. a
Short summary
This paper describes a case study of a three-day period with a persistent humidity inversion above a mixed-phase cloud layer in the Arctic. It is based on measurements with a tethered balloon, complemented with results from a dedicated high-resolution large-eddy simulation. Both methods show that the humidity layer acts to provide moisture to the cloud layer through downward turbulent transport. This supply of additional moisture can contribute to the persistence of Arctic clouds.
Final-revised paper