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.

Instrumentation:

Microwave radiometerFor the measurement of integrated water vapor and liquid water path (PIs: Zuidema/Fairall)
M-AERIIR sea surface skin temperature (PIs: Minnett/Zuidema)
DisdrometersTwo disdrometers will measure the size, fall speed, and precipitation intensity of the different types of precipiation encountered (PI: Zuidema)
CameraAll sky visible camera
RadiosondesSoundings will be conducted 4 times per day. The Vaisala RS41 radiosondes will provide high-resolution temperature, RH, P, and wind profiles up to the 50 - 100 mb level  (PI: deSzoeke)
Stable Water IsotopologuesContinuous measurements of H2O, δD, δ180 water vapor and discrete sea water and precipitation samples from a Picarro gas analyzer (PI:Noone)
SWIFTS (IFT drifters)Six SWIFTS will be deployed and recovered every few days. All models will have bulk winds, air temperature, RH, pressure and ocean surface currents at 0.3 meters. The v3 models will measure ocean turbulence in the upper 0.5 meters. The v4s will measure ocean turbulence in the upper 2 meters along with ADCP profiles of currents down to 20 meters (Pis: Thompson/Thomson)
WaveglidersTwo wavegliders will be equipped with bulk winds, air temperature, RH, pressure, long wave and short wave radiation, sky cameras, wave motion sensors, downlooking ADCPs, and ocean currents at 0.3 and 8 meters depth (Pis: Thompson/Thomson)
Doppler lidarNOAA CSD's doppler lidar for the measurement of atmospheric velocities and backscatter. The measurements yield information about boundary layer turbulence  (PI: Brewer)
Air-sea flux systemFlux system consists of Licor fast humidity, motion system, optical rainguage, lidar wave gauge, mean T/RH/pressure sensors, GPS heading (PI: Fairall)
Broadband radiometersSurface radiation (LW & SW) irradiances
Sea SnakeSea surface temperature (PI: Fairall)
Unmanned aerosol systems (UAS)Vertical profiling will be conducted with 3 different payloads for one flight per payload per day. The Clear Sky payload measures aerosol size distribution, total number concentration and composition and aerosol optical depth (PIs: Quinn/Bates). The Cloudy Sky payload measures aerosol size distribution, total number, and cloud drop number concentration (PIs: Quinn/Bates). The mini-Flux payload measures atmospheric thermodynamic state, turbulence, 3D winds, and surface and sky IR temperature (PI: de Boer).
Underway CTDFor the measurement of surface water conductivity and temperature while the ship is underway (PI: Bigorre)
ThermosalinographUnderway sensor package to sample near surface temperature and salinity (Ship)
Cloud RadarNOAA PSD's W-band radar (95 GHz) for the measurement of the extent and composition of clouds (PI: Fairall)
CeilometerCloud-base fraction as a function of altitude and backscatter (PI: Fairall)
Sun photometerHand held microtops sunphotometer for the measurement of aerosol optical depth (PI:Quinn)
In situ aerosol instrumentationAerosol number concentration, size distribution, chemical composition, volatility at 230C,  light scattering and backscattering at 3 wavelengths, light absorption at 3 wavelengths, f(RH) for scattering, and cloud condensation nuclei concentration (PIs: Quinn/Bates).

PI/Contact:

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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