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Vertical Air Motion Profiles Available Through New Value-Added Product
In the top figure, evidence of stratiform precipitation is observed in the WACR reflectivity profiles. Vertical air motion is retrieved from the WACR velocity spectra for hours 900 to 1200 as depicted on the lower left. An overview of the VAP algorithm is displayed on the lower right. Click to enlarge.The Vertical Air Motion during…
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Evaluation Value-Added Product Estimates Droplet Number Concentration
Adiabaticity parameter and quality check flags for August 15, 2010, at the Southern Great Plains.Cloud droplet number concentration is an important factor in understanding aerosol-cloud interactions. As aerosol concentration increases, it is expected that droplet number concentration, Nd, will increase and droplet size decrease for a given liquid water path, which will greatly affect cloud…
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Announcing: ARM’s New Data Discovery Browser
Now showing on a computer near you is a completely new and dynamic tool for accessing and ordering ARM data!
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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.