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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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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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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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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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Micropulse Lidar Cloud Mask VAP Data Revised for High-Latitude Sites
Data reprocessed with a revised version of the Micropulse Lidar Cloud Mask value-added product (MPLCMASK VAP) are now available for four high-latitude sites. This reprocessing also includes periods of data previously listed as missing. The durations of missing data varied from several minutes to several hours and occurred periodically during the winter months. Affected fields…
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Large-Scale Forcing Data Released for West Antarctic Campaign
The map shows the variational analysis domain (enclosed by the red circle in the left bottom corner) for the ARM West Antarctic Radiation Experiment (AWARE). The domain is centered at 77oS, 168.25oE, near McMurdo Station on Ross Island. Four months of continuous large-scale forcing data are now available for the ARM Mobile Facility deployment at…
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ARM Best Estimate Data Available for African, Antarctic Campaigns
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 earth system models. ARMBE data sets are now available for the Radiative Divergence Using AMF, GERB, and AMMA Stations (RADAGAST) field campaign in Niamey, Niger, and the ARM West Antarctic Radiation…
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New Radiation Data Quality (QCRAD) VAP Release Available for AWARE Field Campaign
The top plot shows best estimates of global shortwave (GSW) downwelling radiation at McMurdo Station, Antarctica, on January 1, 2016, during the AWARE field campaign. The bottom plot shows quality control (QC) flag values indicating the sources of the best estimates for GSW. The Data Quality Assessment for ARM Radiation Data (QCRAD) value-added product (VAP)…
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New Microwave Radiometer Retrievals VAP Data Available for Several ARM Campaigns and Sites
Microwave radiometers, such as this one at ARM’s North Slope of Alaska atmospheric observatory, provide time-series measurements of column-integrated amounts of water vapor and liquid water. The Microwave Radiometer Retrievals (MWRRET) value-added product (VAP) has been processed for the following Atmospheric Radiation Measurement (ARM) user facility field campaigns and measurement sites: the ARM North Slope…