Research Highlights

 

Highlights will be written for high-level accomplishments and published journal articles of ASR research. Each ASR principal investigator (PI) is expected to submit at least one highlight per fiscal year.

Recent Highlights

E3SM parameterization of aged absorbing biomass burning evaluated using ARM and ASR observations

8 November 2019

Dubey, Manvendra K.; Aiken, Allison C

Supported by: ARM ASR

Research area: General Circulation and Single Column Models/Parameterizations

The paper validated and optimized simple parameterizations of aged absorbing aerosols from biomass burning used in the E3SM model by analyzing observations of tropical and southwestern US fire plumes made by ARM campaigns. 

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Near-unity mass accommodation coefficients for low/semi-volatile organic gases into diverse aerosols

6 November 2019

Jimenez, Jose-Luis; Day, Douglas A.

Supported by: ASR

Research area: Aerosol Processes

Accommodation coefficients (α, the probability of a gas molecule sticking to a particle upon collision) were directly measured for a wide range of oxidized organic molecules and particles of different compositions, phases, and polarities. Results showed that in all cases, α was close to unity. Values of ~0.001-0.01 that have [...]

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Partitioning of organic gases to tubing: Measurements, modeling, and software for lab and field sampling

6 November 2019

Jimenez, Jose-Luis; Ziemann, Paul J

Supported by: ASR

Research area: Aerosol Processes

A variety of tubings commonly used for gas and aerosol sampling in laboratory and field measurements in the atmospheric community were tested to determine sampling delays and partitioning mechanisms for organic gases with a wide range of volatilities and functionalities. Delays were quantitatively characterized as a function of volatility and [...]

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A theory for sub-cloud updrafts and cloud-base height

1 November 2019

Zheng, Youtong Youtong Zheng; Li, Zhanqing

Supported by: ARM ASR

Research area: Vertical Velocity

We develop a new theory that explains why air flows are more energetic under higher bases of oceanic shallow clouds

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Comparing antarctic and arctic stratiform mixed-phase clouds

17 October 2019

Zhang, Damao; Vogelmann, Andrew M.

Supported by: ARM ASR

Research area: Cloud Processes

Stratiform mixed-phase clouds—composed of a mixture of ice particles and liquid droplets—are prevalent at high latitudes and greatly impact the regional energy balance. However, climate models have difficulty simulating these clouds and need new observations for improvement. A new analysis compares polar mixed-phase cloud properties from an arctic and an [...]

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