Amf2 instruments and measurements aos
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The following instruments are planned to be deployed aboard the R/V Ron Brown: Aerosol Observing System (AOS) consisting of Cloud Condensation Nuclei Counter (CCN100) . Measures the concentrations of CCNs as a function of supersaturation .

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AMF2 Instruments and Measurements: AOS

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Amf2 instruments and measurements aos

  • The following instruments are planned to be deployed aboard the R/V Ron Brown:

  • Aerosol Observing System (AOS) consisting of

    • Cloud Condensation Nuclei Counter (CCN100). Measures the concentrations of CCNs as a function of supersaturation.

    • Condensation Particle Counter (CPC model 3772). Determines the concentration of aerosol particles down to an aerodynamic diameter of 10 nm.

    • Hygroscopic Tandem Differential Mobility Analyzer (HTDMA). Measures the aerosol (size, mass or number) distribution as a function of relative humidity.

    • Ambient Nephelometer. Measures the light scattering coefficient of aerosols at ambient relative humidity.

    • Wet Nephelometer/f(RH) (humidigraph). Measures the light scattering coefficient of aerosols over a range of relative humidities.

    • Particle Soot Absorption Photometer (PSAP), 3 wavelength. Measures the optical transmittance of particles deposited on a filter and three wavelengths.

    • Ozone. Measures the concentration (range) by absorption.

    • Meteorology at intake height. Wind speed, direction, T/RH, pressureand precip.

AMF2 Instruments and Measurements: AOS


Amf2 instruments and measurement cloud radars

AMF2 Instruments and Measurement: Cloud Radars

  • Ka/X-band Scanning ARM Cloud Radar (Ka/X-SACR). Fully coherent dual-frequency, dual polarization Doppler radars with Ka band (2kW peak power) and X-band (20 kW peak power). The Ka/X radars use Range Height Indicators (RHI) scans at numerous azimuths to obtain cloud volume data instead of Plan Position Indicators (PPI) scans. Primary measurements are; cloud particle size distribution, hydrometeor fall velocity, radar polarization, radar reflectivity.

  • Marine W-band ARM Cloud Radar (MWACR). The 95-GHz radar is mounted pointing vertically on a stabilized platform. The primary measurements are radar Doppler (the power spectrum and moments of the radar signal expressed as a function of Doppler frequency or Doppler velocity) and radar reflectivity.

  • Ka-Band Zenith Pointing Radar (KAZR). A zenith pointing Doppler radar operating and 35 GHz. Used to determine the first three Doppler moments (reflectivity, vertical velocity, and spectral width) at a range resolution of ~30m from near-ground to ~20km.

  • Roll, Pitch and Heave (RPH) stable platform. This hydraulic controlled platform, using data provided by the SEANAV system, compensates for ship’s motion for the vertically pointing w-band radar.

CALWATER 2015 – ACAPEX Campaign Planning Workshop 4/22-24/2014 La Jolla, Ca


Amf2 instruments and measurements cloud macrophysics and aod

AMF2 Instruments and Measurements(cloud macrophysics and AOD)

  • MicropulseLidar (MPL). It is a ground based optical remote sensing system designed to primarily detect the altitude of clouds.

  • Microwave Radiometer (MWR). Provide a time series of the measurements of column integrated amounts of water vapor and liquid water at 23.8 and 31.4 GHz.

  • Microwave Radiometer, 3-channel (MWR3C). Provide a time series of the brightness temperature from three channels centered at 23.834, 30 and 89 GHz.

  • High Spectral Resolution Lidar (HSRL). Provides calibrated measurements of aerosol optical depth, volume backscatter coefficient, cross section and depolarization.

  • Total Sky Imager (TSI). Provides a time series of hemispheric sky images during daylight hours and retrievals of fractional sky cover when solar elevation above 10 degress.

  • Vaisala Ceilometer (VCEIL). Provides the cloud base height, vertical visibility and potential backscatter signals by aerosols. The maximum vertical range is 7700m.

CALWATER 2015 – ACAPEX Campaign Planning Workshop 4/22-24/2014 La Jolla, Ca


Amf2 instruments and measurements winds ts emissivity

AMF2 Instruments and Measurements(Winds, Ts/emissivity)

  • Beam Steerable Radar Wind Profiler (BSRWP). Measures wind profiles and backscattered signal strength. It operates at 1290 MHz and has beam steering capability to correct for ship motion. Primary variables are backscattered radiation, horizontal winds, radar Doppler, radar reflectivity, virtual temperature.

  • Marine Atmospheric Emitted Radiance Interferometer (M-AERI). Measures the absolute thermal infrared spectral radiance emitted by the atmosphere down to the instruments. The MAERI has additional functionality to observe off-zenith scenes and measures surface temperature and emissivity (ocean skin temp).

  • Inertial Navigation System (SEANAV). Laser ring gyro GPS aided Inertial Navigation System (INS) provides high accuracy motion data in three translational frames and three rotational frames of reference: surge, sway, and heave; roll, pitch and yaw.

CALWATER 2015 – ACAPEX Campaign Planning Workshop 4/22-24/2014 La Jolla, Ca


Amf2 instruments and measurements meteorology radiation

AMF2 Instruments and Measurements(Meteorology, radiation)

  • Marine Meteorological Instrumentation (MarineMET). Wind speed, direction, up to two Optical Rain Gauges and two Present Weather Detectors, Siphon rain gauge, two WXT520 multi-parameter weather sensors and HMP-155 T/RH probes are available. Each deployment is unique and this system is configurable. If the vessel has meteorological sensors already available this system may not be deployed.

  • Portable Radiation Package (PRP) and Sun Pyranometer (SPN). The PRP is an instrument that allows for relaxation of some of the stability requirements for ship-based deployments. It consists of an unshaded Precision Spectral Pyranometer (PSP) and Precision Infrared Radiometer (PIR) and a Fast Rotating Shadow Band Radiometer (FRSR). The FRSR uses the same detector as a Multi-filter Rotating Shadowband Radiometer (MFRSR). A Sun Pyranometer is available to be deployed along side the PRP.

  • CIMEL Sunphotometer (CSPHOT). For ocean deployments the CSPHOT sensor is put in a zenith-only mode. No scanning of other sectors of the sky is provided

  • More info can be found at http://www.arm.gov/sites/amf/amf2

CALWATER 2015 – ACAPEX Campaign Planning Workshop 4/22-24/2014 La Jolla, Ca


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