[1] Off-line chemistry and transport models (CTMs) use meteorological information from a general circulation model (GCM) or from a data assimilation system (DAS) to calculate the evolution of stratospheric constituents. Here constituent fields from two CTM simulations are compared with each other and with observations from satellite, aircraft, and sondes to judge the realism of the tropical tra...

This document contains the benchmarking and unit test results for the message passing God dard Earth Observing System General Circulation Model MP GEOS GCM The MP GEOS GCM is an atmospheric model which operates on uniform and stretched latitude longitude grids and is closely related to the shared memory parallel GEOS GCM which is currently in production at the Data Assimilation O ce The unit te...

in agricultural meteorology, the growing season is the period within each year when crops can be grown from a view of thermal conditions. this period is in general, between the last and first frost dates in spring and autumn when temperature is above a specific threshold. there are two other definitions when using a 5 °c as threshold. one of the methods employed in studying future climate is us...

We participate in the Atmospheric Radiation Measurement (ARM) Program with two objectives: 1) to improve general circulation model (GCM) cloud/radiation treatment with focus on cloud vertical overlapping and layer cloud optical properties, and 2) to study the effects of cloud-radiation climate interaction on GCM climate simulations. This report summarizes the recent findings in sub-grid scale v...

Diabatic heating plays a crucial role in the formation and maintenance of the West African Monsoon. A dynamical core configuration of a General Circulation Model (GCM) is used to test the influence of diabatic heating from different sources and regions on the strength and northward penetration of the monsoon circulation. The dynamical core is able to capture the main features of the monsoon flo...

To estimate the sea level rise (SLR) originating from changes in surface mass balance (SMB) of the Greenland ice sheet (GrIS), we present 21st century climate projections obtained with the regional climate model MAR (Modèle Atmosphérique Régional), forced by output of three CMIP5 (Coupled Model Intercomparison Project Phase 5) general circulation models (GCMs). Our results indicate that in a wa...

abstract in this paper, we modeled the climate of iran for future periods. each period is a 30-years period centered on a year. the range of periods is from 2000 (i.e., 1986-2015) to 2100 (i.e., 2086-2115). this was made using 2 general circulation models (echam4 and hadcm2) and 18 ipcc scenarios. magicc-scengen was used as a tool for downscaling gcm low resolution output data. result of hadcm2...

When correcting for biases in general circulation model (GCM) output, for example when statistically downscaling for regional and local impacts studies, a common assumption is that the GCM biases can be characterized by comparing model simulations and observations for a historical period. We demonstrate some complications in this assumption, with GCM biases varying between mean and extreme valu...

Interest in estimating the potential socioeconomic costs of climate change has led to the increasing use of dynamical downscaling--nested modeling in which regional climate models (RCMs) are driven with general circulation model (GCM) output--to produce fine-spatial-scale climate projections for impacts assessments. We evaluate here whether this computationally intensive approach significantly ...