ARM

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  • New England Winter No Match for Science on the Cape

    Winter snowfall in the Boston area is not uncommon, and in February they got it in spades—just in time for the second phase of research flights for the Two-Column Aerosol Project at Cape Cod, Massachusetts. Despite a few “snow days” the ARM Aerial Facility (AAF) team completed a very full and successful schedule of research…

  • Reprocessed Raman Lidar Data Now Available

    Raman Lidar data obtained at the Darwin site have been reprocessed with an improved cloud mask, attenuation flag, and extended height range to 20 kilometers. Data are now available at 2-minute and 10-minute resolution for the Raman Lidar Profiles – Depolarization Ratio (RLPROFDEP) value-added product (VAP), which includes the following primary variables: cloud mask depolarization…

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

    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 Island, Azores. AOD measures the total aerosol burden in the atmosphere. The spectral dependence of AOD, typically described by the Angstrom…

  • Large-Scale Forcing Data Set for SPARTICUS Available

    A new large-scale forcing data set is now available for the Variational Analysis (VARANAL) value-added product (VAP) using data from the Small Particles in Cirrus (SPARTICUS) field campaign. The constrained variational objective analysis approach described in Zhang and Lin (1997) and Zhang et al. (2001) was used to derive the large-scale single-column/cloud-resolving model forcing and…

  • Vertical Air Motion Profiles Available Through New Value-Added Product

    The Vertical Air Motion during Large-Scale Stratiform Rain (VERVELSR) value-added product (VAP) uses the unique properties of a 95-GHz radar Doppler velocity spectra to produce vertical profiles of air motion during low-to-moderate (1–20 mm/hr) rainfall events. It is designed to run at ARM sites that include a W-band ARM cloud radar (WACR) radar with spectra…

  • Evaluation Value-Added Product Estimates Droplet Number Concentration

    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 albedo as smaller droplets reflect more shortwave radiation. However, the magnitude and variability of…

  • Scanning Precipitation Radar Data Corrected and Standardized in New Evaluation Product

    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 raw data and fields that have been processed to: correct for velocity aliasing unfold and generate a cross-polarimetric…

  • Rain Rates Provided by Radar in New Evaluation Product

    Precipitation rates from cloud systems can give a fundamental insight into in-cloud processes. While rain gauges and disdrometers can give information at a single point, remote sensors such as radars can provide rainfall information over a defined area. The Quantitative Precipitation Experiment (QPE) value-added product (VAP) contains precipitation rates gathered by the C-band scanning ARM…

  • A Homecoming Party at the Los Angeles Shipping Dock

    Early this January, ARM’s second mobile facility completed its first extended marine operation. Curious workers at the Los Angeles shipping dock watched as engineers using cranes unloaded the scientific instruments from a cargo ship after finishing eight round trips between Los Angeles, California, and Honolulu, Hawaii.

  • Abstracts Requested for Second China-U.S. Symposium on Meteorology

    The Second China-U.S. Symposium: Severe Weather and Regional Climate Variability and Predictability will be held in Qingdao, China, on June 25-27, 2013. This Symposium is the second in a series; the first having occurred at The University of Oklahoma in February 2007. Symposium goals include defining the current state of the China-U.S. knowledge base and…