National Aeronautics and Space Administration (NASA)
The climate program involves basic research on the nature of climate change and climatic processes, mostly based on the development of three-dimensional coupled general circulation models (GCMs) and their evaluation against a variety of observations. Emphasis is placed on analysis of climate changes on multiple time-scales including simulations of recent (20th and 21st Century) climate change, investigations of climate sensitivity including paleoclimatic studies, and on projections of potential future anthropogenic impacts on the climate. Comparisons to observational data from ongoing field campaigns, remote sensing and in situ modern and paleoclimate sources provide fundamental climate data for evaluating global climate model predictions. GCM developmental research focuses on sensitivity to parameterizations of clouds and moist convection, land surface processes, terrestrial ecosystem-atmosphere interactions, ocean processes, ocean-atmosphere interactions, and ice sheet-climate interactions as well as investigations of more accurate numerical methods.