Although the Mesoscale Community Compressible (MC2) model successfully reproduces the wind climate (for wind energy development purposes) of the Gaspé region, equivalent simulations for the steep mountainous southern Yukon have been unsatisfactory. An important part of the problem lies in the provision of suitable boundary conditions in the lower troposphere. This paper will describe an alterna...

The Thermosphere Ionosphere General Circulation Model developed at the National Center for Atmospheric Research, (NCAR TIGcM), has been used to simulate the time—dependent variations of global thermosphere and ionosphere structure and dynamics during the 20-30 March 1979 time period. Therinospheric density variations predicted by the TIGCM during this period are statistically compared to satell...

The low-frequency time variations of the Northern Hemisphere 500-hPa heights have been investigated using the orthogonal rotated principal component analysis applied to the data provided by the NCEP/NCAR reanalysis for the period 1958-1998. The major modes for the climate in the Euro-Atlantic sector are described in detail. Their relations with the 11 climatic elements in the Czech Republic are...

The Institute of Mathematics Applied to Geosciences (IMAGe) and the National Center for Atmospheric Research (NCAR) has an active research program in the statistical analysis of large numerical simulation of the climate over North America. What is unique about these simulations is their high resolution (50 km) which approaches the scale needed to assess local effects of climate change. The goal...

a Cloud Physics and Severe Weather Research Section, Environment Canada, Toronto, Ontario, Canada b I.M. Systems Group, USA c NOAA/NWS/NCEP, USA d RPN, CMC, Environment Canada, Dorval, Quebec, Canada e Meteorolooieches lnstitut, University of Bonn, Auf dem Hügel 20, 53121 Bonn, Germany f Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China g NCAR, Boulder, CO, USA h Rad...

A recalculation of the global changes of thermospheric gas composition, resulting from strong heat inputs in the aurora1 ovals, shows that (contrary to some previous suggestions) widespread increases of mean molecular mass are produced at mid-latitudes. in summer and at equinox. Decreases of mean molecular mass occur at mid-latitudes in winter. Similar results are given by both the ‘UCL’ and ‘N...

Some ice nucleation characteristics of Asian and Saharan desert dust P. R. Field, O. Möhler, P. Connolly, M. Krämer, R. Cotton, A. J. Heymsfield, H. Saathoff, and M. Schnaiter Met Office, OBR (Observations Based Research), UK Forschungszentrum Karlsruhe, Institute for Meteorology and Climate Research (IMK-AAF), Germany University of Manchester, School of Earth, Atmospheric and Environmental Sci...

We are developing a high-performance broadband radiation code for the current generation of computational architectures. This code, called RRTMGP, will be a completely restructured and modern version of the accurate RRTMG radiation code (Mlawer et al., 1997; Iacono et al., 2008) that has been implemented in many General Circulation Models (GCMs) including the Navy Global Environmental Model (NA...