EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

A Microphysics Guide to Cirrus -- Part II: Climatologies of Clouds and Humidity from Observations

Martina Krämer1,2, Christian Rolf1, and the Cirrus Guide II Team*
Martina Krämer and Christian Rolf and the Cirrus Guide II Team
  • 1Research Center Jülich, Institute for Energy and Climate Research 7: Stratosphere (IEK-7), Jülich, Germany (
  • 2Institute for Atmospheric Physics (IPA), Johannes Gutenberg University, Mainz, Germany (
  • *A full list of authors appears at the end of the abstract

This study presents airborne in-situ and satellite remote sensing climatologies of cirrus clouds and humidity. The climatologies serve as a guide to the properties of cirrus clouds, with the new in-situ data base providing detailed insights into boreal mid-latitudes and the tropics, while the satellite-borne data set offers a global overview.

To this end, an extensive, quality checked data archive, the Cirrus Guide II in-situ data base, is created from airborne in-situ measurements during 150 flights in 24 campaigns. The archive contains meteorological parameters, IWC, Nice, Rice , RHice and H2O (IWC: ice water content, Nice: number concentration of ice crystals, Rice : ice crystal mean mass radius, RHice: relative humidity with respect to ice, H2O: water vapor mixing ratio) for each of the flights. Depending on the specific parameter, the data base has extended by about a factor of 5-10 compared to the previous studies of Schiller et al. (2008), JGR, and Krämer et al. (2009), ACP.

An important step in completing the Cirrus Guide II is the provision of the global cirrus Nice climatology, derived by means of the retrieval algorithm DARDAR-Nice from 10 years of cirrus remote sensing observations from satellite. The in-situ data base has been used to evaluate and adjust the satellite observations.

A specific highlight of the study is the in-situ observations of tropical tropopause layer (TTL) cirrus and humidity in the Asian monsoon anticyclone and the comparison to the surrounding tropics.

Cirrus Guide II Team:

N. Spelten 1, A. Afchine 1, D. Fahey 3, E. Jensen 4, S. Khaykin 5, Th. Kuhn 6, P. Lawson 7, A. Lykov 8, L. L. Pan 4, M. Riese 1, A.Rollins 3, F. Stroh 1, T. Thornberry 3, V. Wolf 6, S. Woods 7, P. Spichtinger 2, J. Quaas 9, and O. Sourdeval 10. 3 NOAA ESRL CSD, Boulder, USA; 4 NCAR, Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, USA; 5 LATMOS/IPSL, UVSQ Université Paris-Saclay, UPMC University Paris 06, CNRS, Guyancourt, France; 6 Luleå University of Technology, Division of Space Technology, Kiruna, Sweden; 7 SPEC Inc., Boulder, CO, USA; 8 Central Aerological Observatory (CAO), Department of Upper Atmospheric Layers Physics, Moscow, Russia; 9 Leipzig Institute for Meteorology (LIM), Universität Leipzig, Leipzig, Germany; 10 Univ. Lille, CNRS, UMR 8518 - LOA - Laboratoire d’Optique Atmosphérique, F-59000 Lille, France;

How to cite: Krämer, M. and Rolf, C. and the Cirrus Guide II Team: A Microphysics Guide to Cirrus -- Part II: Climatologies of Clouds and Humidity from Observations, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-12982,, 2020


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