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Scanning Precipitation Radar Data Corrected and Standardized in New Evaluation Product
a) Attenuation corrected reflectivity filtered for second trip returns. b) Rainfall rates calculated from specific attenuation. Click to enlarge.Raw moments from the scanning ARM precipitation radars (SAPRs) are subject to a number of instrument and atmospheric phenomena that must be retrieved and corrected for. The Corrected Moments in Antenna Coordinates (CMAC) value-added product contains both…
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Rain Rates Provided by Radar in New Evaluation Product
a) Validation of rainfall totals against the Oklahoma Mesonet and b) a single time step showing the ability of the algorithm to capture rain rates from the convective line and trailing stratiform. Precipitation rates from cloud systems can give a fundamental insight into in-cloud processes. While rain gauges and disdrometers can give information at a…
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New VAP Yields Aerosol Optical Depth from Irradiance Measurements
This plot shows spectral AOD versus time of day from the SASHE at the AMF1 Cape Cod site. The plot shows a cloudy morning (gray symbols) followed by cloud-free conditions (colored symbols in a “rainbow” pattern) with aerosol burden evolving over the course of the day. The Shortwave Array Spectroradiometer-Hemispheric (SASHE) is a ground-based instrument…
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Rejected! Update to Langley VAP Dismisses Outliers
An example of a clear day where most values made it through the cloud screening algorithm.A Langley plot is a regression of log (signal) versus airmass. Under appropriate conditions, the Langley regression yields values that represent the response of an instrument in absence of atmosphere (i.e., at the top of atmosphere), and these values are…
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New Value-Added Product Provides Tropospheric Temperature Measurements
Sample output from the RLPROFTEMP VAP showing four selected months. Results are shown for (a) January 2009, (b) April 2009, (c) July 2009, and (d) October 2009.Temperature is one of the most fundamental atmospheric state variables and is crucial to the understanding of many meteorological processes. The Raman lidars at the ARM Climate Research Facility…
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Additional Data Added to Aerosol Optical Depth Product
AOD at five wavelengths (top) and Angstrom exponent (bottom) at the Gan Island site on November 5, 2011.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 zero) indicate presence of…
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New Data from Greenland for Arctic Climate Research
Initial data from the Integrated Characterization of Energy, Clouds, Atmospheric State, and Precipitation over Summit, or ICECAPS, are now available through the ARM Data Archive.
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Toolkit for ARM Radar Data Previewed at Workshop
This data plot shows the height and north/south displacement of rain relative to the ARM Southern Great Plains site’s Central Facility in Oklahoma. This retrieval used information from all three X-band Scanning ARM Precipitation Radars at the SGP site and was performed using tools in the Python-ARM radar toolkit. Click on image to enlarge. In…
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New Flagship Data Product Launched
The new flagship product ARM Best Estimate (ARMBE) has launched with the release of ARM Best Estimate Cloud Radiation (ARMBECLDRAD) and ARM Best Estimate Atmospheric Measurements (ARMBEATM) data sets, formerly under the Climate Modeling Best Estimate VAP. ARMBE will represent all of the ARM best estimate value-added products (VAP).
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Surface Cloud Condensation Nuclei Average Evaluation Product Available
This plot shows the concentration of CCN measured by the cloud condensation particle counter versus the concentration measured by the condensation particle counter.Aerosol observing systems (AOS) at ARM’s sites measure cloud condensation nuclei (CCN) at several supersaturations using a single-column CCN counter. The Average of Cloud Condensation Nuclei from AOS (AOSCCNAVG) value-added product (VAP) was…