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Hydrometeor Field Spatial Statistics Derived From Radar Scans
A new evaluation data set, Plan Position Indicator (PPI) Hydrometeor Field Statistics (PPIHYD), provides spatial statistics based on distinct (clustered) hydrometeor fields from radar scans. By leveraging information harvested from Atmospheric Radiation Measurement (ARM) user facility scanning radar measurements, statistics such as spatial moments and percentiles are calculated for radar reflectivity and Doppler spectral width…
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Micropulse Lidar Cloud Mask Machine Learning VAP Released for 2 ARM Campaigns
This sample quicklook plot from the TRACER ARM Mobile Facility site shows the log of the normalized relative backscatter (log10 NRB), linear depolarization ratio (LDR), and cloud mask from the MPLCMASKML value-added product for September 6, 2022. In addition, the plot contains the machine learning model’s confidence in its prediction, as well as cloud base…
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Updated: Access New Gridded Cloud Radar Product for COMBLE Campaign
Editor’s note (July 20, 2023): A new KASACRGRIDPPI evaluation release for COMBLE, which uses b1-level calibrated PPI data as input, is now available. Output data from KASACRGRIDPPI are uncalibrated c1-level netCDF files, each comprising gridded observations for a single azimuthal scan. Surveillance scans are gridded for elevations of 0, 0.5, 1, and 2 degrees. Output…
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New ARM Data Epoch Assembled From COMBLE Campaign
In this satellite image of the Norwegian Sea on March 28, 2020, a cold-air outbreak spurs the formation of “cloud streets.” As these broken cloud decks stream southward, they evolve into cellular patterns. In red are the two instrument locations in Norway during ARM’s Cold-Air Outbreaks in the Marine Boundary Layer Experiment (COMBLE). This event…
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New Data Product Determines Thermodynamic Phase of Cloud Hydrometeors
Thermodynamic cloud phase identification is important to understand many cloud processes such as ice particle production, precipitation formation, and cloud life-cycle evolution, and it is essential to improve our understanding of cloud radiative properties and the atmospheric radiative budget. Because ice particles and liquid droplets have distinct sizes, shapes, fall velocities, and refractive indexes, clouds…
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Doppler Lidar Data Products Released for 3 ARM Campaigns
Time-height displays show Doppler lidar data from April 14, 2020, during the Cold-Air Outbreaks in the Marine Boundary Experiment (COMBLE). The top plot indicates wind speed (color) and wind vector direction (arrows), and the bottom plot provides vertical velocity. The Atmospheric Radiation Measurement (ARM) user facility operates Doppler lidars around the globe to provide measurements…
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Cloud Type Classification Product Released for COMBLE Campaign
Time-height displays show reflectivity (top) and cloud types (bottom) on April 14, 2020, near Andenes, Norway, during the Cold-Air Outbreaks in the Marine Boundary Layer Experiment (COMBLE). The Cloud Type Classification value-added product (CLDTYPE VAP) is now available for the 2019–2020 Cold-Air Outbreaks in the Marine Boundary Layer Experiment (COMBLE) deployment near Andenes, Norway. CLDTYPE…
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New Aerosol Hygroscopicity Kappa Data Ready for Evaluation
Sample CCNSMPSKAPPA plots from the Surface Atmosphere Integrated Field Laboratory (SAIL) field campaign in Colorado show kappa values within critical diameter-supersaturation field space (top) and a time series of kappa (bottom) on March 15, 2022, at the Crested Butte Mountain Resort site. Hygroscopicity is the ability of a particle to take up moisture from the…
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New Data Set Available From COMBLE Campaign
Top image: Reflectance from the Aqua MODIS satellite visible channel shows cloud streets extending from the ice edge southward to Norway on March 13, 2020. The black star marks the location of the ARM Mobile Facility site near Andenes, Norway, with red, blue, green, and yellow lines indicating back trajectories at 500 meters, 1,000 meters,…
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Large-Scale Forcing Data Released for COMBLE Campaign
The map shows the variational analysis domain (enclosed by the red circle) for the Cold-Air Outbreaks in the Marine Boundary Layer Experiment (COMBLE). The domain is centered at 14.9oE, 70.6oN. The first ARM Mobile Facility (AMF1), sited near Andenes, Norway, is located at the edge of the domain. Continuous large-scale forcing data are now available…