ARM

Tag: MFRSR

  • Cloud Droplet Number Concentration Product Updated

    This sample plot from the Southern Great Plains Central Facility shows the droplet number concentration for October 30, 2019. New data are available from the Droplet Number Concentration value-added product (NDROP VAP), which has been updated to use additional inputs. This will allow NDROP to be available quicker with better retrievals and to be applied…

  • Updated Surface Spectral Albedo Data Released

    This example quicklook from the SURFSPECALB value-added product shows the estimated spectral albedo for the 10- and 25-meter towers at ARM’s Southern Great Plains atmospheric observatory on June 2, 2016. On that date, the surface type for both towers was all vegetation. Updated data from the Surface Spectral Albedo value-added product (SURFSPECALB VAP) are available…

  • New Journal Article Highlights ARM Aerosol Data Set

    Value-added product leverages long-term Southern Great Plains data The Quality Control Aerosol Optical Depth (QCAOD) value-added product combines individual aerosol optical depth records provided by the Cimel sunphotometer (left), multifilter rotating shadowband radiometers (middle), and normal incidence multifilter radiometer (right). A March 2021 article in the journal Scientific Data presents two decades of aerosol data…

  • Areal Average Albedo VAP Evaluation Data Now Available

    Shown here are (top) screened areal daily average albedo and (bottom) quality check results on field.A new value-added product (VAP) estimating the surface albedo at Multifilter Rotating Shadowband Radiometer (MFRSR) spectral wavelengths is now available from the Southern Great Plains (SGP). The Areal Average Albedo (AREALAVEALB) VAP data set is unique in that it gives…

  • Droplet Number Concentration Value-Added Product Now Operational

    As aerosol concentration increases, droplet number concentration will increase and droplet size will decrease. Cloud droplet number concentration is an important factor in understanding aerosol-cloud interactions. As aerosol concentration increases, it is expected that droplet number concentration will increase and droplet size will decrease for a given liquid water path. This will greatly affect cloud…

  • Aerosol Data From Pico Observatory Now Part of Value-Added Product

    Day with moderate aerosol loading (22 June 2010): AOD at five wavelengths (top) and Angstrom exponent (bottom) at the Pico Observatory site.Aerosol optical depth (AOD) measurements have been provided for the Above-Cloud Radiation Budget field campaign at Pico Observatory, Azores, held in conjunction with the 2010 deployment of the ARM Mobile Facility (AMF) in Graciosa…

  • 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…

  • 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…

  • 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…

  • 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…