Abstract: rrors caused by discrete time stepping may be an important component of total model error in contemporary atmospheric and oceanic simulations. To reduce time-stepping errors in leapfrog integrations, the Robert?Asselin?Williams ...

Abstract: he leapfrog time-stepping scheme makes no amplitude errors when integrating linear oscillations. Unfortunately, the Robert?Asselin filter, which is used to damp the computational mode, introduces first-order amplitude ...

Abstract: The Robert?Asselin time filter is widely used in numerical models of weather and climate. It successfully suppresses the spurious computational mode associated with the leapfrog time-stepping scheme. Unfortunately, it also ...

Abstract: Sudden stratospheric warmings (SSWs) are usually considered to be initiated by planetary wave activity. Here it is asked whether small-scale variability (e.g., related to gravity waves) can lead to SSWs given a certain ...

Abstract: ultiple alternating zonal jets are a ubiquitous feature of planetary atmospheres and oceans. However, most studies to date have focused on the special case of barotropic jets. Here, the dynamics of freely evolving baroclinic ...

Abstract: In a recent study, Williams introduced a simple modification to the widely used Robert?Asselin (RA) filter for numerical integration. The main purpose of the Robert?Asselin?Williams (RAW) filter is to avoid the undesired ...

Abstract: A new method of clear-air turbulence (CAT) forecasting based on the Lighthill?Ford theory of spontaneous imbalance and emission of inertia?gravity waves has been derived and applied on episodic and seasonal time scales. A ...

Abstract: This paper describes laboratory observations of inertia?gravity waves emitted from balanced fluid flow. In a rotating two-layer annulus experiment, the wavelength of the inertia?gravity waves is very close to the deformation ...

Abstract: he variation of wind-optimal transatlantic flight routes and their turbulence potential is investigated to understand how upper-level winds and large-scale flow patterns can affect the efficiency and safety of long-haul ...