Research Highlights

Highlights will be written for high-level accomplishments and published journal articles of ASR research. Each PI should submit one highlight per fiscal year. To send in a research highlight, please use the submittal form.

Aggregation of Spherical Carbonaceous Particles in Wildfire Smoke
Jun 30, 2018       
Tar balls are submicron carbonaceous spherical particles, commonly found in wildfire smoke. Their formation mechanisms and optical properties are still much debated, owing to contrasting results published in the literature. In addition, they are often analyzed as single particles; however, in our recent study, we found that they can frequently form fractal-like aggregates.

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Aerosol Swelling: a Major Source of Error When Estimating the Aerosol First Indirect Effect
Jun 27, 2018       
There are few measurements of the concentration of cloud condensation nuclei (CCN), so aerosol optical depth (AOD) is widely used as a proxy when estimating the aerosol first indirect effect (FIE), the foundation of aerosol-cloud interactions in numerous forms. Unlike CCN, AOD may be significantly influenced by the aerosol swelling effect. This can lead to [...]

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Analytical Expression of Marine Stratocumulus Virga Depth Evaluated with Observations
Jun 15, 2018       
Virga is drizzle below cloud base that evaporates before reaching the Earth’s surface. Virga results from the interaction of many different cloud processes with the environment. Researchers at Brookhaven National Laboratory and Michigan Technological University obtained virga statistics from observations and derived a new, simple analytical expression for drizzle virga depth. The expression is a [...]

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WRF Hindcasts of Cold Front Passages over the ARM Eastern North Atlantic Site
Jun 13, 2018       
Low-level clouds behind extratropical cyclone cold fronts are a significant source of biases in General Circulation Models (GCMs), and the ARM East North Atlantic (ARM-ENA) site offers a great opportunity to address this problem. In order to isolate and compare the cloud-scale physics involved in low-level clouds with observations from the site, it is useful [...]

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Global, Remotely Sensed Ice Production in Mid-level Stratiform Mixed-phase Clouds
Jun 12, 2018       
Ice particle production in supercooled liquid clouds has a dramatic impact on the clouds' radiative properties, but it is not well understood and parameterized in models. Mid-level stratiform mixed-phase clouds have a simple dynamic environment and straightforward ice growth trajectory that enables using radar reflectivity measurements to quantitatively infer variations in ice number concentration.

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