Preprints
https://doi.org/10.5194/egusphere-2022-1150
https://doi.org/10.5194/egusphere-2022-1150
 
03 Nov 2022
03 Nov 2022
Status: this preprint is open for discussion and under review for Weather and Climate Dynamics (WCD).

Investigation of dynamical scenarios leading to particularly high impact of Aeolus on NWP forecasts

Anne Martin1, Martin Weissmann2, and Alexander Cress3 Anne Martin et al.
  • 1Ludwig-Maximilians-Universität, Meteorologisches Institut, München, Germany
  • 2Universität Wien, Institut für Meteorologie und Geophysik, Wien, Austria
  • 3Deutscher Wetterdienst (DWD), Offenbach am Main, Germany

Abstract. Global wind profiles from the Aeolus satellite mission provide an important source of wind information for Numerical Weather Prediction (NWP). Data assimilation experiments show large mean changes in the analysis and a significant reduction of forecast errors. At Deutscher Wetterdienst (DWD), an Observing Systems Experiment (OSE) for three months, from July 2020 to October 2020, has been performed to evaluate the impact of the Aeolus horizontal line-of-sight (HLOS) wind observations in the operational data assimilation system of the ICOsahedral Nonhydrostatic (ICON) global model. To better understand the underlying dynamics leading to the overall beneficial impact, specific time periods and regions with particularly high impact of Aeolus are investigated. In this study, we illustrate three examples of atmospheric phenomena that constitute dynamical scenarios for significant forecast error reduction through the assimilation of Aeolus: The phase shift of large-scale tropical circulation systems, namely the quasi-biennial oscillation (QBO) and the El Niño–Southern Oscillation (ENSO), and the interaction of tropical cyclones undergoing extratropical transition (ET) with the midlatitude waveguide.

Anne Martin et al.

Status: open (until 30 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1150', Erland Kallen, 15 Nov 2022 reply
  • RC2: 'Comment on egusphere-2022-1150', Anonymous Referee #2, 02 Dec 2022 reply

Anne Martin et al.

Anne Martin et al.

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Short summary
Global wind profiles from the Aeolus satellite mission are an important recent substitute to the Global Observing System (GOS), showing an overall positive impact on NWP forecasts. This study highlights indications of atmospheric dynamic phenomena constituting pathways for significant improvement of Aeolus for future research studies, including large-scale tropical circulation systems and the interaction of tropical cyclones undergoing an extratropical transition with the mid-latitude waveguide.