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CLIMATE SCIENCE
Climate Models Show Potential 21st Century Temperature and Precipitation Changes
by Staff Writers
Greenbelt MD (SPX) Oct 01, 2013


Models used by the IPCC estimate global temperature and precipitation patterns will change throughout the 21st century given current rising greenhouse gas levels. This video depicts a scenario in which carbon dioxide concentrations reach 670 parts per million by 2100, up from around 400 ppm today. Image Credit: NASA Center for Climate Simulation/NASA Goddard SVS.

New data visualizations from the NASA Center for Climate Simulation and NASA's Scientific Visualization Studio at Goddard Space Flight Center, Greenbelt, Md., show how climate models used in the new report from the United Nations' Intergovernmental Panel on Climate Change (IPCC) estimate possible temperature and precipitation pattern changes throughout the 21st century.

For the IPCC's Physical Science Basis and Summary for Policymakers reports, scientists referenced an international climate modeling effort to study how the Earth might respond to four different scenarios of carbon dioxide and other greenhouse gas emissions throughout the 21st century.

The Summary for Policymakers, the first official piece of the group's Fifth Assessment Report, was released Fri., Sept. 27.

This modeling effort, called the Coupled Model Intercomparison Project Phase 5 (CMIP5), includes dozens of climate models from institutions around the world, including from NASA's Goddard Institute for Space Studies.

To produce visualizations that show temperature and precipitation changes similar to those included in the IPCC report, the NASA Center for Climate Simulation calculated average temperature and precipitation changes from models that ran the four different emissions scenarios.

The final products are visual representations of how much temperature and precipitation patterns would change through 2100 compared to the historical average from the end of the 20th century.

The changes shown in these maps compare an average of the model projections to the average temperature and precipitation benchmarks observed from 1971-2000. This baseline is slightly different from the baseline used in the IPCC report, which was 1986-2005.

Because the reference period from 1986-2005 was slightly warmer than 1971-2000, the visualizations are slightly different than those in the report, even though the same model data is used.

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Related Links
Climate Models Project 21st Century Temperature Changes
Climate Science News - Modeling, Mitigation Adaptation






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