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ARM Releases Products for Evaluating Climate Model and Radar and Lidar Simulator Outputs
The left and right panels show differences between the original and CloudSat-aligned Ka-Band ARM Zenith Radar reflectivities (top) and contoured frequency altitude diagrams (CFADs) generated with those reflectivities (bottom) for January 5, 2014, at ARM’s Southern Great Plains atmospheric observatory. Image is courtesy of Yuying Zhang, Lawrence Livermore National Laboratory. To facilitate the direct comparison…
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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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New Broadband Irradiance Data Produced for 2 ARM Sites
This collection of radiometers at Oliktok Point, Alaska, provided continuous measurements of broadband shortwave (solar) and longwave (infrared) irradiances for downwelling components. ARM stopped collecting data at Oliktok Point in June 2021 after almost eight years. New c2-level data are available from the Data Quality Assessment for ARM Radiation Data (QCRAD) product at Oliktok Point,…
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Raman Lidar Vertical Profiles Product Expands to Oliktok Point, Alaska
Plots from top to bottom show particulate backscatter coefficient profile; particulate extinction coefficient profile; particulate depolarization ratio profile; and detected features at the ARM site in Oliktok Point, Alaska, on July 18, 2018. In the bottom plot, HOI refers to horizontally oriented ice crystals. Data at Oliktok Point, Alaska, are now available from the Raman…
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Micropulse Lidar Cloud Mask Machine Learning VAP Now In Production
This sample quicklook plot from the Southern Great Plains atmospheric observatory shows the log of the normalized relative backscatter (log10 NRB), linear depolarization ratio (LDR), and cloud mask from the MPLCMASKML value-added product for January 1, 2015. In addition, the plot contains the machine learning model’s confidence in its prediction, and cloud base and cloud…
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ARM Best Estimate Data Available From Oliktok Point, Alaska
ARMBEATM relative humidity (top) and surface precipitation (bottom) are shown from the first 120 days of 2020 at Oliktok Point, Alaska. The Atmospheric Radiation Measurement (ARM) user facility provides tailored datastreams known as ARM Best Estimate (ARMBE) data products for use in the evaluation of global climate models. Two ARMBE data sets are now available…
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Satellite-Aligned Version of Ka-Band ARM Zenith Radar Product Now Available
The top image shows best-estimate reflectivity from the Ka-Band ARM Zenith Radar Active Remote Sensing of CLouds (KAZRARSCL) product for a sample day at the Southern Great Plains atmospheric observatory. The middle image provides the KAZRARSCL best-estimate reflectivity after statistical alignment with CloudSat. The bottom image shows the CloudSat reflectivity offset that was applied at…
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First Routine Ice-Nucleating Particle Data Available From ARM Sites in Alaska, Oklahoma
The ice nucleation spectrometer, seen here at ARM’s Southern Great Plains atmospheric observatory, measures the number concentration of ice-nucleating particles. Photo is by Chris Martin, ARM. The Atmospheric Radiation Measurement (ARM) user facility now provides routine data sets on ice-nucleating particles (INPs) from the third ARM Mobile Facility (AMF3) at Oliktok Point, Alaska, and from…
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New Micropulse Lidar Cloud Mask Machine Learning VAP Released
This sample MPLCMASKML plot from the Southern Great Plains atmospheric observatory shows the log of the normalized relative backscatter (log10 NRB), linear depolarization ratio (LDR), and cloud masks from the MPLCMASKML and MPLCMASK value-added products for December 24, 2017. The strength of the machine learning approach is apparent on this day when moderate aerosol loading…
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Aerosol Optical Depth Product Generates New Data
The colors represent aerosol optical depths measured at five different wavelengths with the multifilter rotating shadowband radiometer on June 19, 2019, at Oliktok Point, Alaska. New data are now available from the Aerosol Optical Depth value-added product derived from multifilter rotating shadowband radiometer measurements (AOD-MFRSR VAP). AOD is the measure of the total aerosol burden…