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Station Information

• Photos of CVI at CMDL
• Photos of CVI in the field (July, 2005)

The Counterflow Virtual Impactor (CVI) is a device for preferentially sampling cloud droplets, while not sampling interstitial aerosol particles. The CVI will be deployed this summer at Pt. Reyes, CA as part of an experiment funded by DOE's Atmospheric Science Program (ASP) to study cloud-aerosol interactions. The CVI will be located at the ARM Mobile Facility (AMF) and operate in tandem with a GMD-mentored aerosol observing system (AOS). Results from CVI-related research have been described in a multitude of publications.

CVI in lab at CMDL

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CVI Aerosol Properties Plots

These plots are designed to provide a quick look at the measured aerosol properties. They display raw unedited data, but known corrections for instrument errors have been applied.

Do not quote or cite.

Atmospheric Properties

Short Term Plots (smoothed corrected, 6 min. averages, includes up to last 48 hours of data transferred to GMD):

Long-term Plots (smoothed corrected, hourly averages, last 30 days of data):

Extensive Parameter Summary(scattering, absorption, condensation nuclei) Intensive Parameter Summary(single scattering albedo, backscattering fraction, Ångström exponent) Light Scattering and Absorption Coefficients Light scattering, Humidified Nephelometer Aerosol Intensive Properties, Humidified Nephelometer f(RH) (ratio of wet to dry nephelometer scattering coefficients vs. time) Fitted f(RH) Humidograph (ratio of wet to dry nephelometer scattering coefficients vs. relative humidity) CN concentrations Wind speed and direction 3w_Bap

Extensive Parameter Summary(scattering, absorption, condensation nuclei) Intensive Parameter Summary(single scattering albedo, backscattering fraction, Ångström exponent) Light Scattering and Absorption Coefficients Light scattering, Humidified Nephelometer Aerosol Intensive Properties, Humidified Nephelometer f(RH) (ratio of wet to dry nephelometer scattering coefficients vs. time) Fitted f(RH) Humidograph (ratio of wet to dry nephelometer scattering coefficients vs. relative humidity) CN concentrations Wind speed and direction 3w_Bap

CVI System Status

These plots are designed to allow NOAA/ESRL/GMD staff to review current station operations. Feel free to browse these plots, but be aware that they are raw unedited data.

Most Recent Atmospheric Properties:

Extensive Parameter Summary (scattering, absorption, condensation nuclei) Intensive Parameter Summary (single scattering albedo, backscattering fraction, Ångström exponent) Light Scattering and Absorption Coefficients Light scattering, Humidified Nephelometer Aerosol Intensive Properties, Humidified Nephelometer f(RH)(ratio of wet to dry nephelometer scattering coefficients vs. time) Fitted f(RH) Humidograph (ratio of wet to dry nephelometer scattering coefficients vs. relative humidity) CN concentrations Wind speed and direction 3w_Bap

Short Term Status Plots	Long Term Status Plots
CN Status Temperature CLAP Status Delta Pressure Neph_Bkg_RefG Neph Bkg RefG, Humidified Nephelometer Nephelometer Lamp Nephelometer Lamp, Humidified Nephelometer Neph T, P, RH Neph T, P, RH, Humified Nephelometer RH, Temperature, Dew Point Temperature uMac Status Airflows Active Filter UPS Status 3w_bap	CN Status Temperature CLAP Status Delta Pressure Neph_Bkg_RefG Neph Bkg RefG, Humidified Nephelometer Nephelometer Lamp Nephelometer Lamp, Humidified Nephelometer Neph T, P, RH Neph T, P, RH, Humified Nephelometer RH, Temperature, Dew Point Temperature uMac Status Airflows Active Filter UPS Status 3w_bap