Dataset: alongtrack
Deployment: LMG1110

Data collected along the ship's track for LMG1110, Antarctic.

Chief Scientist:

Ann Bucklin (University of Connecticut, UConn)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Population ecology of Salpa thompsoni based on molecular indicators (Salp_Antarctic)

Current State:

Final no updates expected

Version:

20120402

Version Date:

2012-04-02

Data URL:

https://www.bco-dmo.org/dataset-deployment/455060/data

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Description

This alongtrack data set consists of a single file produced for each day of the LMG1110 cruise, from 11/2/2011 to 12/1/2011. Data were obtained primarily by applying calibrations to raw data and decimating to whole point intervals. However, several fields are derived measurements from more than a single raw input.

IEDA has published a DOI for another version of this dataset: 'Underway Hydrographic, Weather and Ship-state Data (JGOFS) from Laurence M. Gould expedition LMG1110 (2011)' 10.1594/IEDA/318148

Methods & Sampling

Dataset acquisition description

The LMG alongtrack data acquisition systems continuously log data from a suite of instruments throughout the cruise.

For information about events and known problems with acquisition, see the Cruise Data Report.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing Notes and Edits: BCO-DMO obtained the data in .dat format and made the following edits: Space and tab delimiters were replaced with commas. Values originally used to indicate null, unusued, or unknown values (i.e. "9999" or "999.99") were replaced with "nd". Two columns that were labeled "Not used" were omitted from display (these were columns 11 and 20 in original .dat files). Original time in format of hh:mm:ss was removed from display. "time_gmt", "month_gmt", "day_gmt" and "yrday" were calculated and added to the display.

More information about this dataset deployment

Funding

Award Number	Funding Source
ANT-1044982	NSF Antarctic Sciences

Instruments

Anemometer

Supplied Description:

Gill Ultrasonic Wind Observer II; provided continuous measurement of port wind speed and direction. Further informaiton is in the instrument datasheet.

Instrument Type

Generic Name: Anemometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/101/

Generic Description:

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.

Barometer

Supplied Description:

R.M. Young 61201

Instrument Type

Generic Name: Barometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0281/

Generic Description:

A barometer is an instrument used to measure atmospheric pressure. There are many types of barometers identified by make and model and method of measurement.

Eppley Longwave Radiometer

Supplied Description:

Eppley PIR; measures longwave radiation

Instrument Type

Generic Name: Eppley Longwave Radiometer

Acronym: Eppley PIR

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0083/

Generic Description:

The Eppley Precision Infrared Radiometer (PIR) pyrgeometer measures longwave (infrared) radiation. It is housed in a weatherproof titanium canister that has been painted with a very flat black paint that absorbs radiation. A small glass dome at the top of the instrument is covered with an 'interference coating' which allows only infrared radiation to come through. Light levels are detected as temperature changes creating voltages in fine wire coil detectors. more from Eppley Labs

Fluorometer

Supplied Description:

WET Labs ECO-FL (Serial Number FLRTD-399); provides continuous operation when powered, with 6,000-m depth rating. Further information about this instrument is in the user's guide.

Instrument Type

Generic Name: Fluorometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/113/

Generic Description:

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.

Global Positioning System Receiver

Supplied Description:

Trimble 20636-00SM, Seapath 330, Garmin 17

Instrument Type

Generic Name: Global Positioning System Receiver

Acronym: GPS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/POS03/

Generic Description:

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.

Gyro

Supplied Description:

Raytheon Anschutz gyro.

Instrument Type

Generic Name: Gyro

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0079/

Generic Description:

Compass with a motorized gyroscope that tracks true north (heading).

Hygrometer

Supplied Description:

Model: R.M. Young 41372LC; Probe used to measure Air Temp and Relative Humidity on LMG1110 cruise. Calibrated range: -50 to 50 degrees C. More information on this instrument is available from Campbell Scientific.

Instrument Type

Generic Name: Hygrometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0282/

Generic Description:

Hygrometers are used for measuring relative humidity. This term is used when details of the make, model number and measurement principle are not known.

MicroTSG Thermosalinograph

Supplied Description:

SeaBird 45; used for continuous measure of salinity. For further information, see the spec sheet.

Instrument Type

Generic Name: MicroTSG Thermosalinograph

Acronym: MicroTSG

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/133/

Generic Description:

An externally powered, high-accuracy instrument, designed for shipboard determination of sea surface (pumped-water) conductivity and temperature. Salinity and sound velocity can also be computed.

Photosynthetically Available Radiation Sensor

Supplied Description:

Biosph. Instr. QSR-240P

Instrument Type

Generic Name: Photosynthetically Available Radiation Sensor

Acronym: PAR sensor

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/122/

Generic Description:

A PAR sensor measures photosynthetically available (or active) radiation. The sensor measures photon flux density (photons per second per square meter) within the visible wavelength range (typically 400 to 700 nanometers). PAR gives an indication of the total energy available to plants for photosynthesis. This instrument name is used when specific type, make and model are not known.

Precision Spectral Pyranometer

Supplied Description:

Eppley PSP; measures shortwave radiation

Instrument Type

Generic Name: Precision Spectral Pyranometer

Acronym: Eppley PSP

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/112/

Generic Description:

This radiometer measures sun and sky irradiance in the range of wavelengths 0.285 to 2.8 microns, including most of the solar spectrum. The PSP is intended to weight the energy flux in all wavelengths equally. It is a "hemispheric receiver" intended to approximate the
cosine response for oblique rays. The Eppley Precision Spectral Pyranometer (PSP) is primarily used where high accuracy is required or where it is used to calibrate other pyranometers. The PSP outputs a low level voltage ranging from 0 to a maximum of about 12mV depending on sensor calibration and radiation level. An instruction manual provided by Eppley contains the sensor calibration constant and serial number. The Precision Spectral Pyranometer is a World Meteorological Organization First Class Radiometer and comes with a calibration certificate traceable to the World Radiation Reference and a temperature compensation curve. More information is available from Eppley Labs.

Radiometer

Supplied Description:

Biosh. Inst. GUV-2511. For more information, search on "GUV Series" at Biospherical Instruments.

Instrument Type

Generic Name: Radiometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/122/

Generic Description:

Radiometer is a generic term for a range of instruments used to measure electromagnetic radiation (radiance and irradiance) in the atmosphere or the water column. For example, this instrument category includes free-fall spectral radiometer (SPMR/SMSR System, Satlantic, Inc), profiling or deck cosine PAR units (PUV-500 and 510, Biospherical Instruments, Inc). This is a generic term used when specific type, make and model were not specified.

Water Temperature Sensor

Supplied Name: Thermometer

Supplied Description:

SeaBird 38 Digital Remote Thermometer used to measure sea surface temperature. For further information, see the spec sheet.

Instrument Type

Generic Name: Water Temperature Sensor

Acronym: Water Temp Sensor

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/134/

Generic Description:

General term for an instrument that measures the temperature of the water with which it is in contact (thermometer).

WET Labs {Sea-Bird WETLabs} C-Star transmissometer

Supplied Name: Wet Labs CSTAR Transmissometer

Supplied Description:

Wet Labs C-Star 25 cm deep. For more information, see the spec sheet.

Instrument Type

Generic Name: WET Labs {Sea-Bird WETLabs} C-Star transmissometer

Acronym: WL CSTAR Trans

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0160/

Generic Description:

The C-Star transmissometer has a novel monolithic housing with a highly intgrated opto-electronic design to provide a low cost, compact solution for underwater measurements of beam transmittance. The C-Star is capable of free space measurements or flow-through sampling when used with a pump and optical flow tubes. The sensor can be used in profiling, moored, or underway applications. Available with a 6000 m depth rating.

More information on Sea-Bird website: https://www.seabird.com/c-star-transmissometer/product?id=60762467717

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
date	day, month, year (GMT time) e.g. 26/11/11. Name changed from "GMT date" to "date" during data processing. Format is dd/mm/yy.	dd/mm/yy	date
time_gmt	Time GMT, 24 hour clock. Name changed from "GMT time" to "time_gmt" during data processing. Values converted from hh:mm:ss format to hhmm.ss format.	decimal hours	time_gmt
lat	Latitude, negative = South. Name changed from "PCOD latitude" to "lat" during data processing.	decimal degrees	lat
lon	Longitude, negative = West. Name changed from "PCOD longitude" to "lon" during data processing.	decimal degrees	lon
sog	Speed over ground. Name changed from "Ships speed" to "sog" during data processing.	knots	sog
gps_hdop	Horizontal Dilution of Position is an indicator of the precision of the GPS measurement. The lower the number, the more precise the position. Name changed from "GPS HDOP" to "gps_hdop" during data processing.	-	no_bcodmo_term
head	The ship's heading, measured by the Gyroscope. Name changed from "Gyro Heading" to "head" during data processing.	Degrees(azimuth)	heading
cog	Course over ground. Name changed from "Course over ground" to "cog" during data processing.	Degrees(azimuth)	cog
PAR_mast	Downwelled Photosynthetically Available Radiation 400-700nm (PAR), sensor package mounted on ship's science mast. Name changed from "Mast PAR" to "PAR_mast" during data processing.	uE/m<sup>2</sup>/sec	PAR
temp_ss	Sea surface temperature. Name changed from "Sea surface temperature" to "temp_ss" during data processing.	degrees C	SST
sal_ss	Sea surface salinity. Name changed from "Sea surface salinity" to "sal_ss" during data processing.	PSU	sal_ss
wind_speed	Wind speed (true, port windbird). Name changed from "True wind speed" to "wind_speed" during data processing.	meters/sec	wind_speed
wind_dir	Wind direction (true, port windbird). Name changed from "True wind direction" to "wind_dir" during data processing.	degrees(azimuth)	wind_dir
temp_air	Ambient air temperature. Name changed from "Ambient air temperature" to "temp_air" during data processing.	degrees C	temp_air
rel_hum	Relative humidity. Name changed from "Relative humidity" to "rel_hum" during data processing.	%	humidity
air_press	Barometric pressure. Name changed from "barometric pressure" to "air_press" during data processing.	milliBars	press_bar
PIR	Long wave radiation, using a Precision Infrared Radiometer.	watts/meters<sup>2</sup>	radiation_l
PSP	Short wave radiation, using a Precision Spectral Pyranometer.	watts/meters<sup>2</sup>	radiation_s
yrday	Jan. 1 = yrday 0. GMT day and decimal time, as 325.5 for the 326th day of the year, or November 22 at 1200 hours (noon). Values derived from the "date" field.	integer	yrday
depth_w	Sea depth, uncorrected, calc. sw sound vel. 1500 m/s. Name changed from "Sea depth" to "depth_w" during data processing.	m	depth_w
fluor_ss	Sea surface fluorometry. Name changed from "Sea surface fluorometry" to "fluor_ss" during data processing.	volts (0-5 FSO)	flvolt
month_gmt	Month, GMT. Values derived from the "date" field.	mm	month_gmt
day_gmt	Day, GMT. Values derived from the "date" field.	dd	day_gmt
year	year in yyyy format	unitless	year

Database

Contribute Data

Dataset: alongtrack
Deployment: LMG1110

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: alongtrackDeployment: LMG1110

Dataset acquisition description

Dataset Processing Description

Dataset: alongtrack
Deployment: LMG1110