Climate Modeling Jamie Anderson May 2014. Monitoring tells us how the current climate has/is changing Climate Monitoring vs Climate Modeling Modeling.

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Presentation transcript:

Climate Modeling Jamie Anderson May 2014

Monitoring tells us how the current climate has/is changing Climate Monitoring vs Climate Modeling Modeling tells us how the future climate might change Lower future GHG emissions Higher future GHG emissions Surface Temperature Change 2100 vs present Precipitation Change 2100 vs present N. Hemisphere Sept. Sea Ice 2100 vs present Ocean Surface pH Change 2100 vs present Adapted from IPCC 5 th Assessment Summary for Policy Makers

Why are climate models important for DWR?

What is a model?

Mathematical representation on a computer

Building a Global Climate Model National Earth Science Teachers Association

IPCC 1990 IPCC 1995 IPCC 2007 IPCC 2001 IPCC = Intergovernmental Panel on Climate Change Climate Change Assessment reports every 5 years IPCC 1990 IPCC 1995 IPCC 2001 IPCC 2007 More Spatial ResolutionMore Land/Ocean/Atmosphere Processes

Processes in Climate Models Image from National Center for Atmospheric Research

 Future Uncertainty  Data collection  Computational resources needed  Computer model variability  Feedback mechanisms  Spatial Resolution Why so hard to do? Trivia Time: How long does it take a modern global climate model to simulate 150 years?

Climate models are used to explore possible future changes in climate Climate models don’t predict future changes in climate

Weather Modeling vs Climate Modeling Weather Forecasting What will the weather be on a specific day in a specific place Short term (7-10 days) Future Climate Simulations What will the climate trends be in a region in the future Long term (100 years)

Climate models are used to explore possible future changes in climate Climate models don’t predict future changes in climate Scientists & planners use information from many models to make decisions

Mercury Venus Earth Mars Which planet is the warmest? Why?

How will these greenhouse gases change in the future?

Greenhouse Gases in Climate Models IPCC AR5 = Intergovernmental Panel on Climate Change 5 th Assessment Report on Climate Change RCP = Representative Concentration Pathway for future greenhouse gas concentrations, 2.6, 4.5, 6.0, and 8.5 W/m 2 in 2100 RCP overview: Higher GHG concentration RCP8.5 RCP6 RCP4.5 Lower GHG conc. RCP2.6 Concentration CO 2 equivalent from all greenhouse gases (GHG) Representative Concentration Pathways (RCP) used in IPCC AR scenarios for future Greenhouse Gas Concentrations

Climate models are used to explore possible future changes in climate. Global Climate ModelEstimate of Future Greenhouse Gases

Climate Change Scenario Activity 4 volunteers needed

Available Climate Change Scenarios From 2007 IPCC [CMIP3] 112 available scenarios (GCM x Greenhouse Gas) Subset of 12 scenarios recommended by California’s Climate Action Team From 2014 IPCC [CMIP5] More available scenarios (200+) More variables available Higher spatial and temporal resolution Models include improved representations of processes Regional impacts in California are similar to CMIP3 IPCC=Intergovernmental Panel on Climate Change, CMIP=Coupled Model Intercomparison Project

Future Climate Projections National Center for Atmospheric Research

Downscaling Converting Global model output into Regional or Local information into Regional or Local information More specific, Higher resolution, More useful Images from Mike Dettinger, Scripps/USGS Demonstration: Climate Modeling and Legos

Website for Downscaled Climate Change Scenarios

Climate scientists and modelers explore possible future climate conditions DWR staff assess potential impacts and risks that those climate change conditions could have on California’s water resources

Climate Change Technical Advisory Group

What Climate Change Scenarios/Models Should We Use? Bookends scenarios that represent high/middle/low changes Ensemble - Use information from a group of models/scenarios - One way to address variability and uncertainty Other?

UNCERTAINTY Climate Projections Converting global data to local/regional scales Changes in societal values $$$$ Ecosystem response Water cycle changes Future water demands Sea level rise Adaptation Strategies Population Land use changes

Take Home Messages Global climate models explore possible future climate conditions, they don’t predict future climate conditions DWR uses results from global climate models to evaluate possible impacts of climate change on CA’s water resources DWR has a Climate Change Technical Advisory Group to provide us with guidance

27 Thank You!