Preprints
https://doi.org/10.5194/amt-2021-18
https://doi.org/10.5194/amt-2021-18

  01 Feb 2021

01 Feb 2021

Review status: this preprint is currently under review for the journal AMT.

Evaluating the use of Aeolus satellite observations in the regional NWP model Harmonie-Arome

Susanna Hagelin1, Roohollah Azad2, Magnus Lindskog1, Harald Schyberg2, and Heiner Körnich1 Susanna Hagelin et al.
  • 1SMHI, Norrköping, Sweden
  • 2Met Norway, Oslo, Norway

Abstract. The impact of using wind speed data from the Aeolus satellite in a limited area Numerical Weather Prediction (NWP) system is being investigated using the limited area NWP model Harmonie-Arome over the Nordic region. We assimilate the Horizontal Line of Sight (HLOS) winds observed by Aeolus using 3D-Var data assimilation for two different periods, one in Sept–Oct 2018 when the satellite was recently launched, and a later period in Apr–May 2020 to investigate the updated data processing of the HLOS winds. We find that the quality of the Aeolus observations have degraded between the first and second experiment period over our domain. However observations from Aeolus, in particular the Mie winds, have a clear impact on the analysis of the NWP model for both periods whereas the forecast impact is neutral when compared against radiosondes. Results from evaluation of observation minus background and observation minus analysis departures based on Desroziers diagnostics show that the observation error should be increased for Aeolus data in our experiments, but the impact of doing so is small. We also see that there is potential improvement in using 4D-Var data assimilation, which generate flow-dependent analysis increments, with the Aeolus data.

Susanna Hagelin et al.

Status: open (until 29 Mar 2021)

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Susanna Hagelin et al.

Susanna Hagelin et al.

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Short summary
In this paper we study the impact of using wind speed data from the Aeolus satellite, which provides wind speed profiles globally, in our Numerical Weather Prediction system using a regional model covering the Nordic countries. The wind speed profiles from Aeolus are assimilated by the model and we see that they have an impact on both the model analysis and forecast, though given the relatively few observations available the impact is often small.