Preparing for a future satellite mission to measure wind and improve climate forecasts

Cavicchioli, Niccolò (2021) Preparing for a future satellite mission to measure wind and improve climate forecasts. [Laurea magistrale], Università di Bologna, Corso di Studio in Aerospace engineering / ingegneria aerospaziale [LM-DM270] - Forli'
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Stratospheric Inferred Winds (SIW) is a future satellite mission, which has been selected by the Swedish Space Agency to become the next Swedish research satellite, to be launched in 2024. It will consist of a sub-millimetre radiometer instrument, optimised for wind measurements in the middle atmosphere, and orbiting the Earth aboard a microsatellite platform. The goal of this master thesis was to carry out a preliminary study to assess the potential of the mission to contribute to a better understanding of the middle atmospheric dynamical events, and thus to improve weather and climate forecasts. The analysis of zonal mean eastward wind from two five-year-long reanalysis data sets, namely ERA5 and MERRA-2, is described and compared to SIW estimated performances. The areas of major disagreement are investigated in details. It appears that the models have important difficulties to accurately reproduce the dynamical phenomena in the regions out of geostrophic balance due to wave forcing processes. The results show that a significant contribution can be provided by the SIW mission particularly at low latitudes, where the effects related to the Semi-Annual Oscillation can be studied, and at high latitudes during winter-time, where the effects of Sudden Stratospheric Warming events can be investigated. In those regions, at mesospheric altitudes, SIW estimated precision is most of the time significantly lower than the observed differences.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Cavicchioli, Niccolò
Relatore della tesi
Corso di studio
Ordinamento Cds
Parole chiave
SIW, wind measurement, climate forecast, middle atmosphere, atmospheric dynamics
Data di discussione della Tesi
18 Marzo 2021

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