Articles | Volume 14, issue 5
Atmos. Meas. Tech., 14, 3427–3447, 2021
https://doi.org/10.5194/amt-14-3427-2021
Atmos. Meas. Tech., 14, 3427–3447, 2021
https://doi.org/10.5194/amt-14-3427-2021

Research article 12 May 2021

Research article | 12 May 2021

Introducing hydrometeor orientation into all-sky microwave and submillimeter assimilation

Vasileios Barlakas et al.

Data sets

The ERA5 global reanalysis (https://cds.climate.copernicus.eu/\#!/home) H. Hersbach, B. Bell, P. Berrisford, S. Hirahara, A. Horányi, J. Muñoz-Sabater, J. Nicolas, C. Peubey, R. Radu, D. Schepers, A. Simmons, C. Soci, S. Abdalla, X. Abellan, G. Balsamo, P. Bechtold, G. Biavati, J. Bidlot, M. Bonavita, G. De Chiara, P. Dahlgren, D. Dee, M. Diamantakis, R. Dragani, J. Flemming, R. Forbes, M. Fuentes, A. Geer, L. Haimberger, S. Healy, R. J. Hogan, E. Hólm, M. Janisková, S. Keeley, P. Laloyaux, P. Lopez, C. Lupu, G. Radnoti, P. de Rosnay, I. Rozum, F. Vamborg, S. Villaume, S., and J.-N. Thépaut https://doi.org/10.1002/qj.3803

Model code and software

An update on the RTTOV fast radiative transfer model (currently at version 12) (https://nwp-saf.eumetsat.int/site/software/rttov/) R. Saunders, J. Hocking, E. Turner, P., Rayer, D. Rundle, P. Brunel, J. Vidot, P. Roquet, M. Matricardi, A. Geer, N. Bormann, N., and C. Lupu https://doi.org/10.5194/gmd-11-2717-2018

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Short summary
Oriented nonspherical ice particles induce polarization that is ignored when cloud-sensitive satellite observations are used in numerical weather prediction systems. We present a simple approach for approximating particle orientation, requiring minor adaption of software and no additional calculation burden. With this approach, the system realistically simulates the observed polarization patterns, increasing the physical consistency between instruments with different polarizations.