Research Highlights

Why Do General Circulation Models Overestimate the Aerosol Cloud Lifetime Effect?
Mar 21, 2017       
Traditionally, aerosols have been thought to lengthen cloud lifetime by increasing droplet number and reducing droplet size, thereby delaying and reducing the formation of rain in clouds. These longer-lived clouds would then increase cloud cover and reflect more sunlight. Yet observational evidence for these lifetime effects is limited and contradictory. Moreover, observations of ship tracks [...]

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Low-aerosol Conditions over the Azores Occur During Marine Cold Air Outbreaks.
Mar 20, 2017       
Current estimates suggest that between one-quarter and two-thirds of all cloud condensation nuclei in the atmosphere may be a direct result of human activities. Climate models suggest that brighter clouds are masking a significant fraction of the global warming that the Earth would be experiencing if aerosol particle concentrations had not increased. These aerosol-cloud interactions [...]

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High-resolution Photos of Clouds from the Surface Reveal Structure Down to Centimeter Level.
Mar 10, 2017       
Even thin clouds exert strong radiative influences that must be accurately represented in models. This study examines optical depth of thin clouds at unprecedentedly high resolution to examine this important cloud property at scales down to a few centimeters.

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Seasonal and Diurnal Variations of Large-scale Budgets Observed in the GoAmazon2014/15 Experiment
Mar 10, 2017       
Amazonia is one of the major tropical convective regions in the global climate system, providing moisture to the global hydrological cycle and energy to drive the global atmospheric circulation.  This study aims to improve our understanding of the seasonal and diurnal variation of convective systems over the Amazon region and their associated large-scale structures through [...]

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Gone with the Wind: the Trans-Pacific Journey of Atmospheric Particles
Mar 08, 2017       
Dust particles from African and Asian deserts can travel long distances through the atmosphere, but a lack of integrated observations has made it difficult to assess the complex and size-dependent processes associated with dust emission, transport, and removal.

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