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High Model Temperature Bias

Hello, I'm currently running a version of CESM 1.2.2 using the fully coupled B_2000_STRATMAM7_CN componet set configureation. My research group has also added several new aerosol and cloud interaction treatments to the model but we have noticed that our global mean temperature bias compared to NCDC observation is around -2.9 deg C. This is bias is greater than what is typically accepted for global climate models and I was wondering if there are any parameters or namelist options that can be tuned or adjusted to bring the model into better agreement with the observations? Thanks,Tim Glotfelty
 
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