Dataset: OC473 alongtrack
Deployment: OC473

Data collected along the ship's track for OC473.

Chief Scientist:

Gareth Lawson (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

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

Project:

Horizontal and Vertical Distribution of Thecosome Pteropods in Relation to Carbonate Chemistry in the Northwest Atlantic and Northeast Pacific (OAPS)

Current State:

Final no updates expected

Version:

20120410

Version Date:

2012-04-10

Data URL:

https://www.bco-dmo.org/dataset-deployment/455070/data

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Description

This alongtrack data set contains information on environmental conditions for each day of the OC473 cruise, from 8/4/2011 to 9/1/2011.

Methods & Sampling

Dataset acquisition description

Alongtrack measurements were made continuously during the course of the cruise. Data collection was handled by a number of computers and custom software programs, including Calliope, the central program which collects, logs, and distributes the data. Sea surface temperature, salinity, and fluorescence data were collected once per minute upon leaving port. Atmospheric measurements of air temperature, barometric pressure, wind speed and direction, and other meteorological variables were also collected along with time, latitude, and longitude once per minute. These data were saved on the ship’s server on a daily basis in several different file formats.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing Notes and Edits: Parameter names were modified to conform to BCO-DMO convention. Replaced 'nan' and '-999' with 'nd', where applicable. Leading spaces in front of values were deleted. Time was converted from HH:MM:SS format to GMT format. day_gmt, month_gmt, year, and yrday_new were added (computed based on date column).

The following parameters were removed from display:

hour, min, sec - redundant; time_gmt contains this information
ydTime - redundant; yrday_new and time_gmt contain this information
AT (temp_air) - redundant; column contained same values and precision as temp_air_port
HRH (humidity) - redundant; column contained same values and precision as humidity_port
IMET_PRC (precip_rate) - column contained no data for all rows
PRC - redundant; values were derived from precip_port
SBE45T - Calliope metadata states that temp_ss column is best source of sea surface temperature
Salinity - values recorded with less precision than sal_ss column
SSCND - values recorded with less precision than cond_mS column
SSTMP - values recorded with less precision than temp_ss column
SPD - Calliope metadata states that sog column is best source of speed-over-ground in knots
HdChkSum=2F - column used for QC only

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1041068	NSF Division of Ocean Sciences

Instruments

Fluorometer

Supplied Description:

Sea surface fluorometer, WetLabs Wet-Star fluorometer located in the Wet Lab clean seawater piping. A MetraByte A/D converter is used to convert the 0-5 vdc fluorometer output to serial data.

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:

The Furuno GP-1850W (primary GPS) and Furuno GP-90D receivers are the navigation devices for the ship. All GPS units are located on the bridge and are operated by the ship’s watch officer. Typical data provided are Time, Position, Velocity, Course-Over-Ground and Speed-Over-Ground. Heading and altitude from Ashtech GPS.

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:

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).

Knudsen 320 BR deepwater echosounder

Supplied Description:

Depth data was obtained from the Knudsen bathymetry system. Values have been corrected for transducer depth (4 meters). Bathymetric systems (3.5 kHz and 12.0 kHz) include: Knudsen 320B/R with digital data logging and EPC graphic recorder, Knudsen 3260 Chirp echsounder, Edo 323 B 12 kHz transducer, and an array of 12 3.5 kHz transducers.

Instrument Type

Generic Name: Knudsen 320 BR deepwater echosounder

Acronym: Knudsen 320

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/156/

Generic Description:

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.

MicroTSG Thermosalinograph

Supplied Description:

SBE45 MicroTSG sensor connected to the clean seawater system in the Wet Lab. See SBE48 for best sea surface temperature data. More information on this instrument is available on its 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.

Sea-Bird SBE 48 Hull Temperature Sensor

Supplied Name: SBE 48 Hull Temperature Sensor

Supplied Description:

Hull Temperature Sensor; magnetically coupled SBE48 to measure sea surface temperature (C) through the hull. Sensor is located in the bow. Sensor housing is contained in an insulation jacket to limit effect of ambient bow chamber air.

Instrument Type

Generic Name: Sea-Bird SBE 48 Hull Temperature Sensor

Acronym: SBE 48

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

Generic Description:

The SBE 48 is a high-accuracy temperature recorder with non-volatile memory, designed for shipboard determination of sea surface temperature. Installed with magnets just below the water line, the SBE 48's temperature sensor is in contact with the inside of the ship's hull. For more information, see the SBE48 Manual.

Weather Transmitter

Supplied Description:

Vaisala WXT520 weather transmitters mounted on the forward mast, one each on port side and stbd side, 14.5 meters above sea level.

Instrument Type

Generic Name: Weather Transmitter

Acronym: WXT520

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/102/

Generic Description:

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)

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
date	month, day, year (GMT time) e.g. 8/4/2011. Month and day may be 1 or 2 digits. in m/d/yyyy format	unitless	date
time_gmt	Time GMT, 24 hour clock. Values converted from HH:MM:SS format to HHMM.SS format.	decimal hours	time_gmt
lat	Latitude, negative = South.	decimal degrees	lat
lon	Longitude, negative = West.	decimal degrees	lon
sog	Speed over ground (best source) obtained from primary GPS receiver. Name changed from 'SOG' during processing.	knots	sog
head	The ship's heading obtained from primary true heading source (gyro). Name changed from 'HDT' during processing.	Degrees(azimuth)	heading
cog	Course over ground (true), best source, obtained from primary GPS receiver.	Degrees(azimuth)	cog
temp_ss	Sea surface temperature measured by SBE48 sensor. Name changed from 'SBE48T' during processing.	degrees C	SST
sal_ss	Sea surface salinity measured by SBE45 thermosalinograph. Name changed from 'SBE45S' during processing.	PSU	sal_ss
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
cond_mS	Surface conductivity from the SBE45 thermosalinograph. Name changed from 'SBE45C' during processing.	mS/cm	cond_mS
sound_vel	Surface sound velocity from the SBE45 thermosalinograph. Name changed from 'SBE45V' during processing.	m/s	sound_vel
SSC_FSI	Sea surface conductivity measured by FSI sensor.	mS/cm	cond_mS
SST_FSI	Sea surface temperature measured by FSI instrument.	degrees C	SST
wind_speed_r_port	Relative wind speed, port side, obtained from Vaisala WXT520. Wind speed average in m/s (2 Hz, 10 sec sample period). Name changed from 'WXTP_Sm' during processing.	m/s	wind_speed_r
wind_speed_r_stbd	Relative wind speed, stbd side, obtained from Vaisala WXT520. Wind speed average in m/s (2 Hz, 10 sec sample period). Name changed from 'WXTS_Sm' during processing.	m/s	wind_speed_r
wind_speed_c_port	True wind speed, port side. Values calculated from the Vaisala WXT520. Raw data corrected for sensor alignment error and combined with the ship's heading, sog, and cog values. Name changed from "WXTP_TS" during processing.	m/s	wind_speed_c
wind_speed_c_stbd	True wind speed, stbd side. Values calculated from the Vaisala WXT520. Raw data corrected for sensor alignment error and combined with the ship's heading, sog, and cog values. Name changed from 'WXTS_TS' during processing.	m/s	wind_speed_c
wind_speed_kts	True wind speed from primary source (WXT520's). Name changed from 'Wnd_TS' during processing.	knots	wind_speed_kts
year	year (YYYY format); derived from date column.	dimensionless	year
yrday_new	yearday; derived from date column.	dimensionless	yrday
temp_air_port	Air temperature in degrees C. Obtained from Vaisala WXT520 mounted on forward mast, port side, 15 m above waterline. Name changed from 'WXTP_Ta' during processing.	degrees C	temp_air
temp_air_stbd	Air temperature in degrees C. Obtained from Vaisala WXT520 mounted on forward mast, stbd side, 15 m above waterline. Name changed from 'WXTS_Ta' during processing.	degrees C	temp_air
depth_w_12	Depth in meters obtained from the Knudsen 12 kHz channel. 4 meter transducer depth correction has been applied. Name changed from 'Depth12' during processing.	m	depth_w
depth_w_3d5	Depth in meters obtained from the Knudsen 3.5 kHz channel. 4 meter transducer depth correction has been applied. Name changed from 'Depth35' during processing.	m	depth_w
wind_dir_r_port	Relative wind direction, port side. Data obtained from Vaisala WXT520 and has not been corrected for sensor mounting alignment error. A 0-degree wind comes over the bow; 90-degree wind comes over the stbd side. Name changed from 'WXTP_Dm' during processing.	degrees	wind_dir_r
wind_dir_r_stbd	Relative wind direction, stbd side. Data obtained from Vaisala WXT520 and has not been corrected for sensor mounting alignment error. A 0-degree wind comes over the bow; 90-degree wind comes over the stbd side. Name changed from "WXTS_Dm" during processing.	degrees	wind_dir_r
wind_dir_c_port	True wind direction in degrees, port side. Values are calculated from the Vaisala WXT520. Raw data corrected for sensor alignment error and combined with the ship's gyro heading, sog, and cog values. A 0-degree wind comes from the north. Name changed from 'WXTP_TD' during processing.	degrees	wind_dir_c
wind_dir_c_stbd	True wind direction in degrees, stbd side. Values are calculated from the Vaisala WXT520. Raw data corrected for sensor alignment error and combined with the ship's gyro heading, sog, and cog values. A 0-degree wind comes from the north. Name changed from 'WXTS_TD' during processing.	degrees	wind_dir_c
wind_dir_c	True wind direction from the primary source (WXT520's). Name changed from 'Wnd_TD' during processing.	degrees	wind_dir_c
press_bar_port	Barometric pressure obtained from WXT520 mounted on the forward mast, port side, 14.5 m above sea level. Data has been corrected for sensor altitude. Name changed from 'WXTP_Pa' during processing.	hPa	press_bar
press_bar_stbd	Barometric pressure obtained from WXT520 mounted on the forward mast, stbd side, 14.5 m above sea level. Data has been corrected for sensor altitude. Name changed from 'WXTS_Pa' during processing.	hPa	press_bar
press_bar	Barometric pressure obtained from primary source (WXT520's). Values have been corrected for sensor height above sea level (.1185 hPa per meter, Oceanus = 14.5 m). Name changed from 'BPR' during processing.	hPa	press_bar
precip_port	Rain accumulation in mm. Data obtained from Vaisala WXT520 mounted on forward mast, port side, 15 m above waterline. The accumulation value is reset only when the sensor power is reset. Name changed from 'WXTP_Rc' during processing.	mm	precip_level
precip_stbd	Rain accumulation in mm. Data obtained from Vaisala WXT520 mounted on forward mast, stbd side, 15 m above waterline. The accumulation value is reset only when the sensor power is reset. Name changed from 'WXTS_Rc' during processing.	mm	precip_level
precip_rate_port	Rain intensity in mm/hour obtained from Vaisala WXT520 mounted on forward mast, port side, 15 m above waterline. Name changed from 'WXTP_Ri' during processing.	mm/hr	precip_rate
precip_rate_stbd	Rain intensity in mm/hour obtained from Vaisala WXT520 mounted on forward mast, stbd side, 15 m above waterline. Name changed from 'WXTS_Ri' during processing.	mm/hr	precip_rate
humidity_port	Relative humidity (%) obtained from Vaisala WXT520 mounted on forward mast, port side, 15 m above water line. Name changed from 'WXTP_Ua' during processing.	%	humidity
humidity_stbd	Relative humidity (%) obtained from Vaisala WXT520 mounted on forward mast, stbd side, 15 m above water line. Name changed from 'WXTS_Ua' during processing.	%	humidity
FLR	Fluorescence measured by WetLabs Wet-Star fluorometer located in the Wet Lab clean seawater piping. Units are counts (1 volt dc = 1000).	counts	flr
radiation_s	Short wave radiation in watts/square-meter. Raw data is in micro-volts. Raw/8.38 = watts/square-meter. Sensor is mounted on bow mast 15 m above the waterline. Name changed from 'SWR' during processing.	watts/square-meter	radiation_s

Database

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Dataset: OC473 alongtrack
Deployment: OC473

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: OC473 alongtrackDeployment: OC473

Dataset acquisition description

Dataset Processing Description

Dataset: OC473 alongtrack
Deployment: OC473