The data used within Cal-Adapt have been contributed from a variety of research labs around the State of California. Information about where specific data sets are from can be found in our Data Sources page.
The term "projection" is used in two senses in the climate change literature. In general usage, a projection can be regarded as any description of the future and the pathway leading to it. However, a more specific interpretation has been attached to the term "climate projection" by the IPCC when referring to model-derived estimates of future climate.
A coherent, internally consistent and plausible description of a possible future state of the world. It is not a forecast; rather, each scenario is one alternative image of how the future can unfold. A set of scenarios is often adopted to reflect, as well as possible, the range of uncertainty in projections. Other terms that have been used as synonyms for scenario are "characterization", "storyline" and "construction".
The future climate data available, and used within Cal-Adapt, represent a projection of potential future climate scenarios, they are not predictions. These data are meant to illustrate how the climate may change based on a variety of different potential social and economic factors. A thorough examination of model performance and evaluations can be found in the IPCC's Third Assessment Report.
Acronym for Intergovernmental Panel on Climate Change. IPCC is the leading international body for the assessment of climate change. It was established by the United Nations Environment Programme (UNEP) and the World Meteorological Organization (WMO) to provide the world with a clear scientific view on the current state of knowledge in climate change and its potential environmental and socio-economic impacts. More Info »
The .tgz files are zipped packages that contain multiple climate data layer files. You can use an application such as 7zip to extract the data files.