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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 SAIL, CAPE-k
This sample quicklook plot from the SAIL 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 March 16, 2022. In addition, the plot contains the machine learning model’s confidence in its prediction, as well as cloud base…
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New 2- and 3-Channel Microwave Radiometer Retrieval Data Produced
This MWRRET quicklook image provides information from the 2-channel microwave radiometer that operated on the Ellen Browning Scripps Memorial Pier in La Jolla, California, during the EPCAPE campaign on December 14, 2023. The image shows, from top to bottom, observed brightness temperatures at 23.8 GHz (blue) and 31.4 GHz (red); retrieved precipitable water vapor from…
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Lagrangian Large-Scale Forcing Data Released for MOSAiC
The figure provides a time series of vertical velocity (top), horizontal temperature advection (middle), and horizontal moisture advection (bottom) produced by ARMLAGTRAJ for the MOSAiC expedition from November 11 to 21, 2019. Figure is from Cheng Tao, Lawrence Livermore National Laboratory. A new Lagrangian trajectory-based large-scale forcing data product from the Atmospheric Radiation Measurement (ARM)…
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New ARM Trajectory Value-Added Product Now Available for Evaluation
A new evaluation value-added product (VAP) from the Atmospheric Radiation Measurement (ARM) user facility provides back and forward trajectories for airmasses over ARM Mobile Facility deployments. Data from the multipurpose ARM trajectory (ARMTRAJ) VAP can provide information on the likely history of airmasses before they were observed over an ARM site, such as origin and…
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Historical Video Disdrometer Quantities Processed for Southern Great Plains
Time series of (a) rain rate, (b) radar reflectivity factor at S band, and (C) total droplet concentration from the VDISQUANTS value-added product are shown for August 24, 2012, at the Southern Great Plains Central Facility. Data plots are by Aifang Zhou, Brookhaven National Laboratory. The Atmospheric Radiation Measurement (ARM) user facility recently released more…
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Characterized and Calibrated Radar Data Now Available for TRACER Campaign
This map indicates the Houston-area radar locations during TRACER, including those of the second-generation C-Band Scanning ARM Precipitation Radar (CSAPR2), Ka- and X-band scanning ARM cloud radars (SACR), and Ka-Band ARM Zenith Radar (KAZR). ARM’s radar team cross-compared data from the ARM and NOAA NEXRAD Houston/Galveston (KHGX) radars to help determine reflectivity offsets. Map was…
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MOSAiC Doppler Lidar Motion Correction VAPs Now in Production
The location of ARM’s Doppler lidar on the R/V Polarstern during the MOSAiC expedition is indicated in this ARM file photo. Two value-added products (VAPs) specifically designed for the 2019–2020 Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition recently moved from evaluation to production. The Doppler Lidar Motion Correction (DLMC) VAP applies…
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ARM Provides World’s First Multi-Site Long-Term Data Record of Ice-Nucleating Particles
Editor’s note: Jessie Creamean, a research scientist at Colorado State University and an ARM mentor for ice-nucleating particle collection and analysis, sent in the following update. Here I am setting up a salad bowl ice-nucleating particle (INP) sampler in Tasmania for the CAPE-k campaign. (Literally, we use a salad bowl to protect our filters from rain…
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New Aerosol Optical Depth Data Available for TRACER Campaign
The colors represent aerosol optical depths measured at wavelengths of 415, 500, 615, 673, 870, and 1625 nanometers (nm) with the multifilter rotating shadowband radiometer on May 12, 2022, in La Porte, Texas, during the TRACER campaign. The time of day is in Coordinated Universal Time (UTC). Data plot is by Evgueni Kassianov, Pacific Northwest…