Federal Office of Meteorology and Climatology MeteoSwiss

A life cycle definition of year-round weather regimes in the North Atlantic European region

Abstract. Weather regimes are quasi-stationary, persistent, and recurrent states of the large-scale extratropical circulation. Weather regimes explain most of the multi-day atmospheric variability on sub-seasonal time scales of 5 to 30 d. While regime definitions have been explor...

The benefit of neighborhood methods for the assimilation of cloud‐affected radiances evaluated in observing‐system simulation experiments

Abstract Deficiencies in the representation of hydrometeors and subgrid‐scale motions in numerical weather prediction models cause systematic differences between satellite observations and their model equivalents, which pose a significant challenge for the assimilation of cloud‐a...

Long range transport of Canadian wildfire smoke to Europe in 2023: aerosol properties and spectral features of smoke particles

Abstract. The Canadian wildfires of 2023 had an unprecedented biomass burning season spanning from mid-April to late October. Towards the end of this long biomass burning season, there was a rare observation of smoke properties that occurred in about a week interval, that were di...