Large-scale secondary circulations in a limited area model – the impact
                        of lateral boundaries and resolution

Becker, Nico; Ulbrich, Uwe; Klein, Rupert

doi:10.1080/16000870.2018.1548869

Tellus A: Dynamic Meteorology and Oceanography

2018

DOI: 10.1080/16000870.2018.1548869

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Large-scale secondary circulations in a limited area model – the impact of lateral boundaries and resolution

Nico Becker¹,

Uwe Ulbrich²,

Rupert Klein

Abstract: View related articles View Crossmark data Citing articles: 1 View citing articles Large-scale secondary circulations in a limited area modelthe impact of lateral boundaries and resolution

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Cited by 2 publications

References 36 publications

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Present and future diurnal hourly precipitation in 0.11° EURO-CORDEX models and at convection-permitting resolution

Meredith¹,

Ulbrich²,

Rust³

et al. 2021

Environ. Res. Commun.

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The diurnal cycle of precipitation (DCP) is a core mode of precipitation variability in regions and seasons where the dominant precipitation type is convective. The occurrence of extreme precipitation is often closely linked to the DCP. Future changes in extreme precipitation may furthermore, in certain regions, exhibit a strong diurnal signal. Here we investigate the present and future diurnal cycle of hourly precipitation in the state-of-the-art 0.11°C EURO-CORDEX (EC-11) ensemble and in a convection-permitting model (CPM), with a focus on extremes. For the present climate, long-standing timing and frequency biases in the DCP found in lower-resolution models persist in the EC-11 ensemble. In the CPM, however, these biases are largely absent, particularly the diurnal distribution of extremes, which the EC-11 ensemble misrepresents. For future changes to hourly precipitation, we find clear diurnal signals in the CPM and in EC-11 models, with high regional and intra-ensemble variability. The diurnal signal typically peaks in the morning. Interestingly, the EC-11 ensemble mean shows reasonable agreement with the CPM on the diurnal signal’s timing, showing that this feature is representable by models with parametrized convection. Comparison with the CPM suggests that EC-11 models greatly underestimate the amplitude of this diurnal signal. Our study highlights the advantages of CPMs for investigating future precipitation change at the diurnal scale, while also showing the EC-11 ensemble capable of detecting a diurnal signal in future precipitation change.

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Present and future diurnal hourly precipitation in 0.11° EURO-CORDEX models and at convection-permitting resolution

Meredith¹,

Ulbrich²,

Rust³

et al. 2021

Environ. Res. Commun.

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Assessing the impact of sea surface temperatures on a simulated medicane using ensemble simulations

Noyelle

Ulbrich

Becker

et al. 2019

Nat. Hazards Earth Syst. Sci.

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Abstract. The sensitivity of the October 1996 Medicane in the western Mediterranean basin to sea surface temperatures (SSTs) is investigated with a regional climate model via ensemble sensitivity simulations. For 11 SST states, ranging from −4 K below to +6 K above the observed SST field (in 1 K steps), 24-member ensembles of the medicane are simulated. By using a modified phase space diagram and a simple compositing method, it is shown that the SST state has a minor influence on the tracks of the cyclones but a strong influence on their intensities. Increased SSTs lead to greater probabilities of tropical transitions, to stronger lower- and upper-level warm cores and to lower pressure minima. The tropical transition occurs sooner and lasts longer, which enables a greater number of transitioning cyclones to survive landfall over Sardinia and re-intensify in the Tyrrhenian Sea. The results demonstrate that SSTs influence the intensity of fluxes from the sea, which leads to greater convective activity before the storms reach their maturity. These results suggest that the processes at steady state for medicanes are very similar to tropical cyclones.

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Large-scale secondary circulations in a limited area model – the impact of lateral boundaries and resolution

Abstract: View related articles View Crossmark data Citing articles: 1 View citing articles Large-scale secondary circulations in a limited area modelthe impact of lateral boundaries and resolution

Cited by 2 publications

References 36 publications

Present and future diurnal hourly precipitation in 0.11° EURO-CORDEX models and at convection-permitting resolution

Present and future diurnal hourly precipitation in 0.11° EURO-CORDEX models and at convection-permitting resolution

Assessing the impact of sea surface temperatures on a simulated medicane using ensemble simulations

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