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The alongtrack data from RV/Atlantis cruise 15-61 were recorded by the shipboard data acquisition system (Calliope).
The research objectives and planned science activities on this cruise include upper water column biogeochemistry and shallow and deep sediment trap deployment at six major (> 24h) stations and 6 minor (< 24h) stations in the Peru Basin.
Gill WindObserver II Ultrasonic Anemometer
An anemometer is a device for measuring the velocity or the pressure of the wind. It is commonly used to measure wind speed. Aboard research vessels, it is often mounted with other meteorological instruments and sensors.
WetLabs Wet-Star fluorometer located in the Hydro Lab clean seawater piping. A MetraByte A/D converter is used to convert the 0-5 vdc fluorometer output to serial data. This device sets the output decimal point as necessary for best resolution, which results in a 1 vdc fluorometer value being represented as +01000.00 in the raw MetraByte serial stream.
A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.
NorthStar 941 GPS receiver NMEA (National Marine Electronics Association) output
Format: $--RMC,hhmmss.ss,S,lat,a,lon,a,x.x,y.y,ddmmyy,m.m,d*hh<cr><lf> Time = UTC of position fix S = Status ("A" = valid, "V" = receiver warning) Lat & Lon x.x = speed over ground (knots) y.y = Course over ground (degrees true) ddmmyy = date m.m,d = magnetic variation, degrees ("E" subtracts from true, "W" adds to true)
The Global Positioning System (GPS) is a U.S. space-based radionavigation system that provides reliable positioning, navigation, and timing services to civilian users on a continuous worldwide basis. The U.S. Air Force develops, maintains, and operates the space and control segments of the NAVSTAR GPS transmitter system. Ships use a variety of receivers (e.g. Trimble and Ashtech) to interpret the GPS signal and determine accurate latitude and longitude.
Sensors mounted on the bow mast at a height of 20 m above the waterline.
http://www.whoi.edu/page.do?cid=11368&pid=8415&tid=282
An IMET Recorder is an instrument package that can be mounted on a ship or buoy to record mean weather data including air and sea-surface temperature, incoming short and long-wave radiation, precipitation, humidity, wind velocity and barometric pressure. Each sensor in the system communicates digitally and returns calibrated values to a central data recorder.
Knudsen bathymetry ( Knudsen) Depth to surface (meters). Format: $PKEL99,HF,xx.xx,cc.cc,LF,yy.yy,cc.cc,ssss,lat,lon "HF" High freq header xx.xx 12 kHz depth to surface using cc.cc & ssss corrections (meters) cc.cc depth of 12 kHz transducer (meters) "LF" Low freq header yy.yy 3.5 kHz depth to surface using cc.cc & ssss corrections (meters) cc.cc depth of 3.5 kHz transducer (meters) ssss sound speed used for depth calculations (m/s) Lat Latitude Lon Longitude Note - 12 kHz and 3.5 kHz transducers are at 5.95m (19.5 ft) depth on Atlantis.
The Knudsen 320 B/R deepwater echosounder is a digital data logging system used to measure water depth (e.g. depth of the seafloor). The system is configured to work with different frequency transducers. For example, the Edo 323 B is a 12 kHz High Frequency (HF) transducer or it can be configured to work with an array of 3.5 kHz Low Frequency (LF) transducers mounted in the hull of a vessel.
Seabird SBE 45 MicroTSG -or- Falmouth Scientific TSG. Located in bow thruster room; intake ~5m BWL
A thermosalinograph (TSG) is used to obtain a continuous record of sea surface temperature and salinity. On many research vessels the TSG is integrated into the ship's underway seawater sampling system and reported with the underway or alongtrack data.
The ship-mounted Vaisala Weather Transmitter WXT520 measures: Wind speed and direction; Liquid precipitation: rainfall, duration, intensity; Barometric pressure; Air temperature and Relative humidity. (for more information see http://www.vaisala.com/en/products/multiweathersensors/Pages/WXT520.aspx)
GPS course over ground
Sea Surface Conductivity (FSI)
GMT day and decimal time, as 326.5 for the 326th day of the year, or November 22 at 1200 hours (noon).
Fluorescence
Ship's heading
ship's heading using Phins
IMET % relative humidity
Relative humidity from port side using WXT520
Decimal Latitude; South is negative
Decimal Longitude; West is negative
Barometric pressure; not corrected for 19.5m height above waterline
Barometric pressure from port side using WXT520
IMET Shortwave Radiation
Rain accumulation from port side using WXT520
Rain intensity from port side using WXT520
Salinity calculated from SST and SSC
GPS speed over ground
Sound velocity
Air Temp
Air temperature from port side using WXT520
Sea Surface Temperature
GMT Time
True Wind Direction
Relative wind direction from port side using WXT520
True Wind Speed
Relative wind speed from port side using WXT520
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