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Aerosol Optical Depth Measurements Available as Value-Added Product
Cloud-screened AOD at five wavelengths (top) and Angstrom exponent (bottom) over a three-month time period at the Black Forest, Germany deployment. Aerosol optical depth (AOD) measures total aerosol burden in the atmosphere. The spectral dependence of AOD, typically described by the Angstrom exponent, is also an indicator of particle size. Small Angstrom exponent values (near…
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ARM Cloud Retrieval Ensemble Data Set Available for Evaluation
Multiple long-term cloud retrievals are now available for five ARM sites in the ACRED data set. A new ARM evaluation product, the ARM Cloud Retrieval Ensemble Data Set (ACRED), is now available for testing by the science community. ACRED was developed with the motivation to provide a rough estimate of the uncertainties in current retrieved…
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Lidar Value-Added Product Provides Cloud Measurements
Sample plot generated by MPLCMASK. Click to enlarge. Lidar cloud boundaries are a useful tool for identifying cloud base height and cloud thickness in optically thin clouds. The Micropulse Lidar Cloud Mask (MPLCMASK) value-added product (VAP) provides cloud base height, cloud top height, and backscatter coefficient for non-polarized micropulse lidar measurements. In addition, depolarization ratio…
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Microwave Radiometer Retrieval Data Available for ARM Sites
An example plot from the MWRRET VAP for 10/8/1999 at SGP. (top) Brightness temperatures measured by the MWR; orange and blue lines indicate potential measurement spikes due to precipitation, (middle) retrieved precipitable water vapor from the new physical method (blue) and the original statistical method (green), (bottom) retrieved liquid water path from the new physical…
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More Climate Modeling Best Estimate Data Available for More Sites
Soundings and surface meteorological measurements are now available for five ARM sites in the CMBE data set.The latest release of the Climate Modeling Best Estimate (CMBE) data set has added soundings and surface meteorological measurements in the CMBE-ATM datastream for Barrow, Alaska, and all three Tropical Western Pacific sites. For these four sites, the cloud…
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Shortwave Flux Analysis Extended to North Slope of Alaska
This summer, the ARM Radiative Processes Working Group released an extension of the Shortwave Flux Analysis value-added product to include data from the ARM North Slope of Alaska locale. Originally released in 2004, the Shortwave Flux Analysis VAP was developed to infer clear-sky shortwave, shortwave cloud effects, and fractional sky cover from shortwave measurements at…
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Long-Term Best Estimate Data Available for Climate Modelers
CMBE data plot example. To better serve the needs of climate model development, the ARM Climate Research Facility has devoted significant effort to assemble a “climate modeling best estimate” (CMBE) of the highest-quality cloud and radiation measurements. This data set, specifically tailored for use in evaluating global climate models, includes long-term best estimates from selected…
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Data from the NOAA Climate Reference Network for Barrow, AK, and Stillwater, OK, are Available Through the External Data Center
The ARM Climate Research Facility is providing data in netCDF format from the U.S. Climate Reference Network (USCRN), a network of climate change monitoring stations developed by the National Oceanic and Atmospheric Administration (NOAA). This network provides long-term observations of temperature and precipitation that can be paired with long-term historical observations for the detection and…
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Arctic Surface Radiation Data Now Available at the ARM Data Archive
Researchers lead by principal investigator Ellsworth Dutton used more than 30 years of surface irradiance data obtained from Barrow, Alaska, in a study of temporal and spatial variations (Dutton et al. 2006). The high-temporal-resolution (1- to 3-minute averages) data and the quality-assured hourly averages are now available from the ARM Data Archive. See http://www.arm.gov/xdc/xds/noaarad for…