Hello, A yearly allocation for the LCRC cluster has been requested with the following updated information: Submitter/PI: Yan Feng Project Name: wrfchem_for_aerprof Division: EVS Project title: Investigation of Cloud-Aerosol Interactions Associated funding: NASA Earth Science Division Other Systems: NERSC Science: Marine low clouds have been recognized as a key component of the Earth’s energy budget due to their strong albedo and cooling effects. The radiative properties of these marine low clouds can be substantially altered by atmospheric aerosols, through changes in the cloud droplet number concentration and cloud optical thickness. Although these aerosol-mediated indirect effects have been widely observed and represented in models, their magnitudes constitute one of the largest uncertainties in our current understanding of radiative forcing. The goal of the project is to investigate aerosol-cloud interactions and the aerosol indirect effect in marine low clouds using NASA satellite datasets. High-resolution regional climate model WRF simulations will be conducted to provide the physical interpretation of the satellite-observed correlations and evaluate the relative importance of free tropospheric and boundary layer aerosols. Particular emphasis will be given to the aero sol vertical variability, aerosol humidification, and entrainment rate. Project description: In FY17, we have completed the model configuration and several test runs of the latest version of WRF model (3.9.1) and its precursor model WPS (3.9.1) on Blues. The latest WRF model is optimized and uses domain decomposition to divide total work load on distributed-memory systems. We have test-run WRF-Chem at three resolutions: 30km, 12km, and 4km for a 30°×40° domain (~20 50°N; ~152°W–112°W). Total grid number in the 4-km configuration is up to 19 millions, currently scaled to 36 nodes. The initial results are being processed and evaluated before longer simulations. In FY18, we plan to perform 5-10 ensemble simulations with the new WRF model at 12 km and 4 km resolutions each. Those simulation experiments will be three-month for May-June-July of 2013. This is the season when marine low clouds off the California coast are most abundant. We will scale the WRF model to more node numbers, especially for 4 km resolution runs. In addition, we will work on testing the chemistry module with WRF. Chemistry initial and boundary conditions will be obtained from the MOZART-4 global chemical transport model outputs. The default anthropogenic emissions in the U.S. are based on the 4-km the Environmental Protection Agency (EPA) 1999 National Emissions Inventory (NEI) dataset in WRF-Chem and will be updated for sulfate, organic carbon (OC), and black carbon (BC) from the NEI 2011 inventory. Industry partnership: Project URL: Current FY Hours Used: undetermined amount New FY Requested allocation: 90000 Q1: 25000 Q2: 20000 Q3: 25000 Q4: 20000 Justification: Storage requirements: 1 TB is suffient Thank You, The LCRC Accounts System