Articles | Volume 18, issue 22
https://doi.org/10.5194/acp-18-16729-2018
https://doi.org/10.5194/acp-18-16729-2018
Research article
 | 
27 Nov 2018
Research article |  | 27 Nov 2018

Intercomparison of midlatitude tropospheric and lower-stratospheric water vapor measurements and comparison to ECMWF humidity data

Stefan Kaufmann, Christiane Voigt, Romy Heller, Tina Jurkat-Witschas, Martina Krämer, Christian Rolf, Martin Zöger, Andreas Giez, Bernhard Buchholz, Volker Ebert, Troy Thornberry, and Ulrich Schumann

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Cited articles

Afchine, A., Rolf, C., Costa, A., Spelten, N., Riese, M., Buchholz, B., Ebert, V., Heller, R., Kaufmann, S., Minikin, A., Voigt, C., Zöger, M., Smith, J., Lawson, P., Lykov, A., Khaykin, S., and Krämer, M.: Ice particle sampling from aircraft – influence of the probing position on the ice water content, Atmos. Meas. Tech., 11, 4015–4031, https://doi.org/10.5194/amt-11-4015-2018, 2018. 
Andersson, E., Hólm, E., Bauer, P., Beljaars, A., Kelly, G. A., McNally, A. P., Simmons, A. J., Thépaut, J. N., and Tompkins, A. M.: Analysis and forecast impact of the main humidity observing systems, Q. J. Roy. Meteorol. Soc., 133, 1473–1485, https://doi.org/10.1002/qj.112, 2007. 
Baumgardner, D., Jonsson, H., Dawson, W., O'Connor, D., and Newton, R.: The cloud, aerosol and precipitation spectrometer: a new instrument for cloud investigations, Atmos. Res., 59–60, 251–264, https://doi.org/10.1016/S0169-8095(01)00119-3, 2001. 
Birner, T., Dörnbrack, A., and Schumann, U.: How sharp is the tropopause at midlatitudes?, Geophys. Res. Lett., 29, 45-41–45-44, https://doi.org/10.1029/2002GL015142, 2002. 
Boer, G. J., Arpe, K., Blackburn, M., Déqué, M., Gates, W. L., Hart, T. L., Treut, H. l., Roeckner, E., Sheinin, D. A., Simmonds, I., Smith, R. N. B., Tokioka, T., Wetherald, R. T., and Williamson, D.: Some results from an intercomparison of the climates simulated by 14 atmospheric general circulation models, J. Geophys. Res.-Atmos., 97, 12771–12786, https://doi.org/10.1029/92JD00722, 1992. 
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We present an intercomparison of the airborne water vapor measurements during the ML-CIRRUS mission. Although the agreement of the hygrometers significantly improved compared to studies from recent decades, systematic differences remain under specific meteorological conditions. We compare the measurements to model data, where we observe a model wet bias in the lower stratosphere close to the tropopause, likely caused by a blurred humidity gradient in the model tropopause.
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