Convective precipitation-localized, short-lived, intense, and sometimes violent-is at the root of challenges associated with observation, simulation, and prediction of precipitation. The understanding of long-term changes in convective precipitation characteristics and their role in precipitation extremes and intensity over extratropical regions are imperative to future water resource managemen...

[1] A new convective parameterization is introduced that can make use of a large variety of assumptions previously introduced in earlier formulations. The assumptions are chosen so that they will generate a large spread in the solution. We then show two methods in which ensemble and data assimilation techniques may be used to find the best value to feed back to the larger scale model. First, we...

This paper provides a brief summary of some of the recent research completed using radar observations of convective cloud systems associated with the North-Australian monsoon. The key focus is to describe the variability of convective cloud system properties as a function of the large scale regimes characterizing the region. This latter work is linked with the evaluation of the ACCESS model and...

Spiros Alexakis, Markus Bauer, Albina Pace, Alexa Schumacher CAS Software AG, Wilhelm-Schickard-Str. 10-12, 76131 Karlsruhe, GERMANY [email protected] [email protected] [email protected] [email protected] Andreas Friesen SAP Research, CEC Karlsruhe, Vincenz-Prießnitz-Str. 1, 76131 Karlsruhe, GERMANY [email protected] Athanassios Bouras Institute of Communication and Computer...

We develop lowest-order asymptotic approximations for the eigenfrequencies and eigenfunctions of linear, isentropic, low-frequency g-modes in stars consisting of a convective core and radiative envelope. The approximations are derived from a fourth-order system of differential equations in the divergence and radial component of the Lagrangian displacement without neglecting the Eulerian perturb...

The stratification near the base of the Sun’s convective envelope is governed by processes of convective overshooting and element diffusion, and the region is widely believed to play a key role in the solar dynamo. The stratification in that region gives rise to a characteristic signal in the frequencies of solar p modes, which has been used to determine the depth of the solar convection zone a...

This paper presents a new scheme that classifies convective and stratiform (C/S) precipitation areas over oceans using microwave brightness temperature. In this scheme, data are first screened to eliminate nonraining pixels. For raining pixels, C/S indices are computed from brightness temperatures and their variability for emission (19 and 37 GHz) and scattering (85 GHz). Since lower-resolution...

Direct numerical simulation (DNS) and dynamic mode decomposition (DMD) are used to study the shear layer characteristics of a jet in a crossflow. Experimental observations by Megerian et al. (J. Fluid Mech., vol. 593, 2007, pp. 93–129) at velocity ratios (R = vj/u∞) of 2 and 4 and Reynolds number (Re = vjD/ν) of 2000 on the transition from absolute to convective instability of the upstream shea...

[1] Wind stress variability over the Benguela upwelling system is considered using 16 months (01 August 1999 to 29 November 2000) of satellite-derived QuikSCAT wind data. Variability is investigated using a type of artificial neural network, the selforganizing map (SOM), and a wavelet analysis. The SOM and wavelet analysis are applied to an extracted data set to find that the system may be divi...