Overview of the Climate Impact on Regional Air Quality (CIRAQ) Project Ellen J. Cooter , Alice Gilliland , William Benjey , Robert Gilliam and Jenise.

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Presentation transcript:

Overview of the Climate Impact on Regional Air Quality (CIRAQ) Project Ellen J. Cooter *, Alice Gilliland *, William Benjey *, Robert Gilliam * and Jenise Swall * U.S. EPA, National Exposure Research Laboratory, Atmospheric Modeling Division, Research Triangle Park, NC 2004 Models-3 Conference October 18-20, 2004 * On assignment from NOAA Air Resources Laboratory

Objective: Examine potential climate change impacts on O 3 and PM using the regional scale Community Multiscale Air Quality (CMAQ) model linked with global scale climate and chemical transport models Supports U.S. Climate Change Science Program (CCSP) research goals and synthesis products AMD PIs include: Ellen Cooter Project management Climate assessment, landscape/vegetation change Alice GillilandCMAQ modeling and linkages with global CTMs Bill BenjeyAir quality emissions, future emission scenarios Robert GilliamRegional climate model evaluation Collaborators include:  Ruby LeungPacific Northwest National Laboratory (MM5 RCM)  Dan LoughlinEPA NRMRL (future emission scenarios)  Daniel JacobHarvard University (GISS, GEOS-CHEM) Loretta Mickley  Peter AdamsCarnegie Mellon University (global CTM)  Ron NeilsonUSDA-FS, Pacific Northwest Research Station Climate Impacts on Regional Air Quality (CIRAQ)

CIRAQ Information Flow and Responsibilities EPA /NRMRL EPA / NOAA(ASMD) Agency Key EPA / NCEA DOE / PNNL USDA /FS CCSP Synthesis Report 4.5 Air Quality Scenarios CCSP Base Program 3. Atmospheric Composition CCSP Synthesis Report 4.6 Socioeconomic Impacts of Climate Variability Vegetation Change Anthropogenic Emissions MM5/RCM Meteorology (GCM Downscaling) Biogenic emissions Air Quality (Ozone and PM) GCM (Harvard via STAR)

CIRAQ Project Timeline FY03-05 Understanding the global to regional climate linkage to support regional scale air quality simulations FY04-07 Understanding the impact of climate change on regional air quality (CIRAQ Phase 1) -Develop 5-yr current and future (fixed technology and landuse) emissions scenarios -Perform 5-yr current and future (2050) CMAQ simulations FY06-09 Understanding the impact of climate and emissions changes on regional air quality (CIRAQ Phase 2)

Downscaled Meteorology (linking global and regional scale climate) GCM (Harvard University)  GISS version II’  6hrly output saved for 10 present-day and 10 future years.  Used as boundary and initial conditions to MM5 Downscaling with MM5 (DOE/PNNL)  MM5 run in regional climate mode 23 layers, MRF planetary boundary layer parameterization, Grell cumulus cloud parameterization, RRTM radiation scheme and mixed phase microphysics  36km x36km horizontal resolution spanning continental US, northern Mexico and southern Canada

Smoke Emissions The Regional Climate Model Data Management and Quality Control Tool (Lead, Gilliam)

RCM Evaluation/Analysis The Goal: To understand climatological biases that could impact CMAQ model performance The Challenge: RCM scenarios characterize time periods under representative climatological conditions and will not necessarily reproduce day-to-day and exact year-to- year observations. The Solution: Base evaluation on temporal and spatial characteristics of model output means, extremes and variability.

MM5/RCM Obs

MM5/RCM/MCIP Evaluation Time Series Analysis (Leads, Gilliland and Swall) Meteorological conditions include annual, diurnal, and interannual cycles, in addition to stochastic variability These cyclical components can be isolated using time series analysis techniques (e.g., filtering techniques, Fourier analysis, etc.) Amplitude of these cycles and the extent of variability can be compared for observational data and model output Understanding these cyclical patterns allows for better detection of climate change signals and investigation of these changes

MM5/RCM/MCIP Evaluation Spatial Analysis (Lead, Cooter) Goal: Develop methods to compare spatial patterns of gridded meteorological (or other) means and extremes across datasets. Method: Cluster analysis –Wards (means) –Average linkage and k-means (extremes) Analysis: Visual – difference mappings Quantitative – frequency analysis Developed and tested using 10 years of NCEP and NCEP/AMIP reanalysis data

Question: Do average summer season 700mb transport patterns look similar? NCEP Reanalysis R-1 (black arrows) NCEP/AMIP Reanalysis R-2 (red arrows) (R2 – R1)

Question: Are the relative frequencies of average summer season 700mb transport patterns similar? NCEP Reanalysis R-1NCEP/AMIP Reanalysis R-2 Location and distribution of patterns 1 and 4 are similar. Location and distribution of patterns 2, 3 and 5 are different Pattern Number Relative Pattern Frequency

Question: How many unique (extreme) patterns can be identified? Ex, NCEP R-1 has 7 patterns; NCEP/AMIP R-2 has 7 patterns Are the patterns similar across datasets? Ex. Early summer drought pattern Do the patterns occur in a similar fashion across datasets? Ex., R-1 pattern found 112 times in R-1, R-1 pattern found 99 times in R-2 Ex, R-2 pattern found 272 times in R-2, R-2 pattern found 198 times in R-1 NCEP R1 NCEP/AMIP R2R2-R1

SMOKE Emission Modeling (Lead, Benjey) Biogenic Model Mobile Model Area Model Point Model Land Cover and Land Use Data RCM/MCIP Scenarios Emissions Inventories Hourly Emissions Factor Computation Hourly Layer Fractions Merge Processing CMAQ

MM5/RCM-Driven Isoprene Emissions

CMAQ Air Quality Simulations (Lead, Gilliland) Plan O 3, PM 2.5, PM 10, sulfate and nitrate deposition, … U.S. continental domain, 36 km horizontal resolution Linkages to global scale chemical transport simulations through boundary conditions  Two global CTMs (Harvard and Carnegie-Mellon)  Both driven by GISS II’ GCM Challenge Global CTM chemical mechanism matched to SAPRC (AMD) Temporal and spatial scale issues (Univ. of Houston) CMAQ simulations are expected to begin during FY05

Disclaimer Portions of the research presented here were performed under the Memorandum of Understanding between the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Commerce’s National Oceanic and Atmospheric Administration (NOAA) and under agreement number DW Although this work was reviewed by EPA and NOAA and approved for publication, it may not necessarily reflect official Agency policy.