A Madden-Julian Oscillation (MJO) is a massive weather event consisting of deep convection coupled with atmospheric circulation, moving slowly eastward over the Indian and Pacific Oceans. Despite its enormous influence on many weather and climate systems worldwide, it has proven very difficult to simulate an MJO because of assumptions about cumulus clouds in global meteorological models. Using ...

Abstract Performance of global climate models (GCMs) is strongly affected by the cumulus parameterization (CP) used. Similar to approach in GFDL AM4, a double-plume CP, which unifies deep and shallow convection one framework, implemented tested NCAR Community Atmospheric Model version 5 (CAM5). Based on University Washington (UW) scheme, an additional plume was added represent convection. The p...

The advent of powerful computers has enabled atmospheric scientists to run weather forecast and climate models at ever increasing resolutions. Of particular interest are limited area models with high temporal and spatial resolution that can be run affordably on workstations. These models, initialized and forced at the boundaries with data from large-scale models with coarse resolution, resolve ...