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Objective To understand how much natural decadal variations in dust affect clouds Approach

Dust Increases Low Cloud Cover. Objective To understand how much natural decadal variations in dust affect clouds Approach Run the Community Earth System Model for 150 years under pre-industrial conditions, with no emissions from human activity

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Objective To understand how much natural decadal variations in dust affect clouds Approach

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  1. Dust Increases Low Cloud Cover • Objective • To understand how much natural decadal variations in dust affect clouds • Approach • Run the Community Earth System Model for 150 years under pre-industrial conditions, with no emissions from human activity • Examine cloud-aerosol relationships across inter-annual timescales Interannual correlation between June – August mean dust burden and lower tropospheric cloud fraction anomalies simulated by the CESM over the tropical/subtropical Atlantic Ocean. Impact • Found a strong enhancement of cloud cover below plumes of dust transported from Africa • The mechanism is identified to be suppression of vertical mixing due to absorption of sunlight by the dust. DeFlorio MJ, SJ Ghan, B Singh, AJ Miller, DR Cayan, LM Russell and RCJ Somerville. 2014 “Semi-Direct Dynamical and Radiative Impact of North African Dust Transport on Lower Tropospheric Clouds over the Subtropical North Atlantic in CESM 1.0.” Journal of Geophysical Research, early online. DOI: 10.1002/2013JD020997

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