REFERENCES Maria Val Martin 1 C. L. Heald 1, J.-F. Lamarque 2, S. Tilmes 2 and L. Emmons 2 1 Colorado State University 2 NCAR.

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REFERENCES Maria Val Martin 1 C. L. Heald 1, J.-F. Lamarque 2, S. Tilmes 2 and L. Emmons 2 1 Colorado State University 2 NCAR 1. Introduction 3. Model Evaluation: CASTNET and IMPROVE Obs. (c) 5. Effects of Global Change on Air Quality Poor air quality in national parks adversely affects park ecosystems, staff and visitors. To develop air quality management and mitigation plans, the National Park Service needs to understand the contributions of current emission sources as well as contributions from projected future emission scenarios. Here, we present a preliminary modeling analysis using the NCAR Community Earth System Model (CESM). The objective is to assess the potential future consequences of climate and emission changes on ozone (O 3 ) and particulate matter (PM2.5) over the US National Parks. [1] Lamarque et al, CAM-Chem: Description and evaluation of interactive atmospheric chemistry in CESM, GMDD, [2] Oleson et al., Technical Description of version 4.0 of the Community Land Model (CLM). NCAR Technical Note NCAR/TN- 478+STR, National Center for Atmospheric Research, Boulder, CO, 257 pp., [3] Fiore et al., Characterizing the tropospheric ozone response to methane emission controls and the benefits to climate and air quality, JGR [4] Murazaki and Hess, How does climate change contribute to surface ozone change over the United States? JGR, [5] Brown-Steiner and Hess, Asian influence on surface ozone in the United States: A comparison of chemistry, seasonality, and transport mechanism, JGR, EFFECTS OF THE CHANGING CLIMATE AND EMISSIONS ON THE AIR QUALITY IN THE U.S. NATIONAL PARKS ACKNOWLEDGEMENTS This work is supported by the National Park Service (grant H /J ). We thank GEIA/ACCENT for providing the gridded RCP emission data. 2. CESM and Setup CESM ( CESM is driven by emissions (anthropogenic and biomass burning) and meteorological scenarios predicted for 2050 by the IPCC AR5 Representative Concentration Pathways (RCP) inventory IPCC AR5 Scenarios: RCP 4.5 and RCP 8.5 ( 6. Future work Simulated O 3 (2000) compared to CASTNET sites ( ) Annual Average Model simulations performed (and planned) for 2000 and 2050 Coupler CAM-Chem [1] (CAM-5) 1.9x2.5 spatial resolution 26 vertical levels to ~3 hPa Prescribed sea-ice and ocean data CLM-4 [2] RCP Main GHGs Projections ( ) 4. Effects on Changes in Climate Alone Future simulations were performed for RCP4.5 and RCP 8.5. We will repeat the runs for 10 different meteorological scenarios to estimate the effect of interannual climate variability. Results from 2050 Clim simulation are not shown here. O 3 is simulated well over western US, and overestimated over eastern US by about 20 ppb. This strong positive bias in CESM and other models is well documented in previous work [e.g., 3,4,5]. Simulated PM2.5 (2000) compared to IMPROVE sites ( ) Good agreement between model and observations. Fine sea salt (SSLT) and dust (DST) emissions were adjusted in the model to match surface observations. Temperature Annual Average in 2000 Precipitation This project is still on-going. The next steps include: Quantify changes resulting from climate, anthropogenic and natural emissions alone. Focus on the air quality over the U.S. National Parks. Study the effect of nitrogen deposition. Consider the effects of land cover/land changes. Perform high resolution (1x1) simulations and analyze the effect of spatial resolution on the results RCP RCP Annual Average in RCP RCP Annual Average Chemical Speciation of Annual Average Summer Daily Max 8-hr Avg Surface O 3 Changes in Summer Daily Max 8-hr Average (MDA8) O RCP 4.5 – RCP 8.5 – 2000 Annual mean temp increases by 1 o C with RCP4.5, and by as much as 3 o C with RCP8.5 Annual mean precipitation increases by 13% Annual mean precipitation increases by 7% and by up to 70% over the northwest. It decreases by 20% over the east Changes in Annual Average PM RCP 4.5 – 2000* Larger decrease in average summer MDA8 O 3 with RCP4.5 (-14 ppb) than RCP8.5 (-7 ppb), mainly as result of climate penalty. Chemical Speciation East West Larger decrease in annual PM2.5, in particular over eastern US, due mainly from a decrease in SO 4 (70%) and NH 4 NO 3 (60%). This is mostly the result of strong emission reductions Trends in Anthropogenic Main Emissions over the U.S (Tg species/yr). Climate Penalty * (∆Climate= Anthro) RCP4.5 RCP8.5 *It may include the effect of natural emissions in response to climate *2050 RCP shows very similar spatial pattern *CO and NMVOCs in Tg C/yr; NO and NH 3 in Tg N/yr and SO 2 in Tg S/yr. Also, indicated % decrease ( ↓) or increase ( ↑)