Blar i forfatter "Stoll, Johannes Patrick"

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    • The global atmospheric energy transport analysed by a wavelength-based scale separation 

      Stoll, Johannes Patrick; Grand Graversen, Rune; Messori, Gabriele (Journal article; Tidsskriftartikkel; Peer reviewed, 2022)
      The global atmospheric circulation is fundamental for the local weather and climate by redistributing energy and moisture. To the present day, there is a knowledge gap at which spatial scales the energy and its components are transported. Therefore, we separate the meridional atmospheric energy transport in the ERA5 reanalysis by the spatial scales, the quasi-stationary and transient flow patterns, ...

    • A global climatology of polar lows investigated for local differences and wind-shear environments 

      Stoll, Johannes Patrick (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-11)
      Polar lows are intense mesoscale cyclones developing in marine polar air masses. This study presents a new global climatology of polar lows based on the ERA5 reanalysis for the years 1979–2020. Criteria for the detection of polar lows are derived based on a comparison of five polarlow archives with cyclones derived by a mesoscale tracking algorithm. The characteristics associated with polar lows are ...

    • Subseasonal Predictions of Polar Low Activity Using a Hybrid Statistical-Dynamical Approach 

      Boyd, Kevin; Wang, Zhuo; Walsh, John; Stoll, Johannes Patrick (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-21)
      The subseasonal prediction of polar low (PL) activity is explored using a hybrid statistical-dynamical approach. A previously developed PL genesis potential index is paired with ECMWF reforecasts and forecasts to predict regional statistics of PL activity across the sub-Arctic. Regional PL activity is skillfully predicted in all regions at forecast ranges of up to a month. Additionally, the ...