Research Vessel Ronald H. Brown


As part of ATOMIC, NOAA's R/V Ronald H Brown will be deployed during EUREC4A between 6 January and 13 February.  The R/V Ron Brown will focus on air-sea interaction with an emphasis on the mesoscale, primarily operating in the area between the R/V Meteor (upwind of Barbados) and the NTAS buoy near 51 ºW. Presently it is scheduled to leave Barbados on 6 January for its first leg, which will initially be spent in an active eddy region, likely south of Barbados, where it will deploy SWIFTS, wave-gliders and conduct UAV flights. Thereafter it will transit to the NTAS buoy where it will spend 3-5 days replacing the buoy and making measurements. The leg will conclude by recovering the SWIFT buoys and returning to Barbados on 26 January.  Leg has a scheduled to begin on 28 January and presently intends to focus on an inter-comparison with BCO and other ATOMIC and EUREC4A platforms in the region and measuring in a region mid-way between the HALO circle and NTAS thus serving as an upwind point of observation for the EUREC4A campaign.  The R/V Ron Brown will conclude its mission upon returning to Barbados on 13 February.


Drifting BuoysUp to 12 drifting buoys in line across gradients in current, SST, and sea-surface salinity (Elizabeth Thompson, U. Colorado, Jim Thomson, NOAA APL).
Wave GlidersUp to 2 SV3 Wave Gliders (Elizabeth Thompson, U. Colorado, Jim Thomson, NOAA APL).
Atmospheric SoundingsThree times daily (minimum) Vaisala RS41-SGP radiosondes measuring pressure, temperature, humidity and GPS position (Simon deSzoeke U. Oregon).
Microwave cloud radar & radiometerW-band 94 GHz polarized cloud radar on a stabilized platform provides vertical profiles of reflectivities, doppler velocity, spectral width, linear depolarization ratio, and full Doppler spectra. Microwave radiometer (MWR) with retrievals of liquid water path and integrated water vapor. Synergistic retrievals with lidar and solar spectrometer provide estimates of cloud droplet number concentration. Within the Cloudnet framework cloud boundaries, hydrometeor classification (including cloud phase), ice water content, and liquid water content are retrieved (Paquite Zuidema, U. Miami and Chris Fairall, NOAA PSD).
Near surface aerosol propertiesAerosol chemical, microphysical and optical propeerties and CCN and sea spray aerosol number production flux (Trish Quinn NOAA APL).
Boundary layer profilingAutonomous vehicle profiling with clear and cloudy sky payloads.  UAV Clear Sky payload: microphysical, optical, and chemical properties. UAV Cloudy sky payload: Cloud droplet probe and aerosol size distribution.
Raman LidarScanning Water Vapor Raman lidar (tentative) for high-temporal resolution profiling of water vapor, temperature and aerosol optical properties.
Turbulent Surface FluxesAn air-sea flux system on the forward mast.  This consistes of a Licor fast humidity, motion system, optical raingauge, Lidar wave gauge, mean air-temperature, relative humidity, pressure sensors, GPS heading and O2 rail.
Hyper-spectral IRHyper-spectral infrared measurements for FTIR measurements and trace-gas/water vapor retrievals.  (Paquita Zuidema, U. Miami)
Wind-lidarVector winds in the lower atmosphere (Louise Nuijens, U.Delft).
Eddy covariance Mast based measurements will provide surface momentum, and enthalpy fluxes.
Stable isotopologuesL2140-i7 Picarro instrument for stable water isotopologue measurements (David Noone, U Colorado, Simon deSzoeke, U Oregon).


Patricia (Trish) Quinn, NOAA Applied Physics Laboratory, Seattle Washington. All general questions should be directed to her. For instrument specific questions, contact the instrument PIs identified above.

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