We present a “nudged” version of the Met Office general circulation model, the Unified Model. We constrain this global climate model using ERA-40 re-analysis data with the aim of reproducing the observed “weather” over a year from September 1999. Quantitative assessments are made of its performance, focusing on dynamical aspects of nudging and demonstrating that the “weather” is well simulated.

We present a Python-based framework for the complete operation of robotic telescope observatory. It provides out-of-the-box support many popular camera types while other hardware like telescopes, domes, and weather stations can easily be added via thin abstraction layer to existing code. Common functionality focusing, acquisition, auto-guiding, sky-flat pipeline calibration are ready use. A rem...

Taking advantage of the advent of massively parallel computers, sophisticated solution-adaptive techniques, and recent fundamental advances in basic numerical methods we have developed a high performance, adaptive-scale MHD code capable of resolving many of the critical processes in the Sun–Earth system which range over more than nine orders of magnitude. The development of such models are of i...

BACKGROUND Prior research has examined access to syringe exchange program (SEP) services among persons who inject drugs (PWID), but no research has been conducted to evaluate variations in SEP access based on season. This is an important gap in the literature given that seasonal weather patterns and inclement weather may affect SEP service utilization. The purpose of this research is to examine...

Images of outdoor scenes captured in bad weather suffer from poor contrast. Under bad weather conditions, the light reaching a camera is severely scattered by the atmosphere. The resulting decay in contrast varies across the scene and is exponential in the depths of scene points. Therefore, traditional space invariant image processing techniques are not sufficient to remove weather effects from...

Over the last two decades, processor speeds have been improving much faster than memory speeds. As a result, memory access delay is a major performance bottleneck in today’s systems. Because compilers often fail to automatically choreograph data and computation to avoid memory access delay, we have developed a source-to-source transformation tool for this purpose. To use our tool, developers an...

We present a series of results acquired at a 2-kilometer distance using our lidar system under several weather conditions, clear, cloudy, light rain, moderately foggy, and night. The experimental results show that ghost imaging lidar via spar-sity constraints can realize imaging in all these weather conditions.

This paper reviews the cumulative effect of land-cover change on local, regional, and global weather and climate. Documented land-cover changes from 1700 to the present are shown to be particularly significant in the tropics. Model results are presented which show the teleconnection of weather patterns worldwide result from these landscape changes.

Within the new meteorological workstation project NinJo, a comprehensive Automatic Monitoring and Alerting system (AutoMON) has been introduced at the Deutscher Wetterdienst (DWD). This system is able to permanently monitor significant weather situations in observations and model forecasts, and it automatically alerts the forecaster in case of critical (hazardous) weather events. Furthermore, i...

The performance attained by parallel programs executed on multiprocessor sys tems is largely in uenced both by the characteristics of the code and by those of the system architecture Indeed parallel machines are typically message passing systems consisting of hundreds of processing elements Implementing high perfor mance parallel applications is a di cult task and understanding sources of poor ...