Dataset: alongtrack

Name: Alongtrack data collected continuously by the ship's underway acquisition system from R/V Knorr cruise KN207-01 in the southern tip of Nova Scotia to Bermuda in 2012 (SargassoSeaLipids project)
Published: 2012-07-17
Keywords: oceans

Cite This Dataset

Spatial Extent: N:41.523952 E:-64.47653 S:32.377586 W:-70.920534

Project:

Biogeochemical Impact and Fate of Non-phosphorus Membrane Lipids in the Sargasso Sea (SargassoSeaLipids)

Program:

Ocean Carbon and Biogeochemistry (OCB)

Chief Scientist:

Benjamin A.S. Van Mooy (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

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

Version:

17 July 2012

Version Date:

2012-07-17

Validated:

Yes

Current State:

Final no updates expected

Alongtrack data collected continuously by the ship's underway acquisition system from R/V Knorr cruise KN207-01 in the southern tip of Nova Scotia to Bermuda in 2012 (SargassoSeaLipids project)

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Description

This alongtrack data was recorded by the R/V Knorr's data logging system, Calliope, during the KN207-01 cruise from 04/21/12 to 05/04/12.

Methods & Sampling

A .csv file was generated for each day of the cruise. Each file normally starts at midnight GMT and data is added approximately once per minute. The following were known problems with data acquisition:

(1) Data should be considered faulty from 16:30 GMT until 22:00 GMT on April 21, 2012 due to a failure of the Science Saltwater System pump for the following parameters: sal_ss_SBE, temp_ss5_2, sal_ss, cond_mS, and flr.
(2) Surface PAR (par_scalar_s) readings may be artificially low during the period from 12:20 to 12:40 GMT on April 26, 2012. (The sensor was covered during this time with double-thick window screen mesh as part of an experiment.)
(3) On April 30, 2012 from 10:40 to 11:00 GMT, underway fluorometer and SBE45 sensors were flushed with freshwater and the fluorometer cell was cleaned. Parameters effected are: sal_ss_SBE, temp_ss5_2, sal_ss, cond_mS, and flr.

Data Processing Description

BCO-DMO retrieved the .csv files from the ship's hard drive and the following edits were made: blank values were replaced with 'nd' to indicate 'no data'; time_gmt, month_gmt, and day_gmt were reformatted; yrday was calculated and added based on the date; parameter names were changed to conform to BCO-DMO conventions; the following parameters were removed from display:
Depth35 (3.5 kHz depth) - all values were 0 or nd.
SBE45C - duplication of cond_mS; both parameters are sea surface conductivity from the primary source (SBE45).
SBE48T - duplication of temp_ss; both parameters are sea surface temp from the primary sensor (SBE48).
WXTS_Ta (air temp starboard) - values are identical to temp_air.
WXTS_Pa (press_bar starboard) - values are identical to press_bar.
WXTP_Ua (humidity port) - values are identical to humidity.

Data Files

File
KN207-01_alongtrack.csv (Comma Separated Values (.csv), 4.74 MB) MD5:3ce3e6c73d38c852fed8552e30b24080 Primary data file for dataset ID 3663

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1031143

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KN207-01	BLATZ II	2012-04-21	R/V Knorr	Benjamin A.S. Van Mooy (Chief Scientist)	data info

Instruments

Fluorometer

Supplied Description:

Wetlabs Wet-Star fluorometer located in the Hydro Lab clean seawater piping. A MetraByte A/D converter is used to convert the 0 - 5 volt dc fluorometer output to serial (count) data. Output: 0 - 5 VDC; 0 - 4095 counts.

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:

Simrad MX512 GPS receiver.

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.

Improved Meteorological Recorder

Supplied Description:

humidity, air_temp, press_bar, true wind speed (wind_speed_c), and true wind direction (wind_dir_c) are obtained from the IMET sensors, mounted on the forward mast 15.5 meters about the waterline.

Instrument Type

Generic Name: Improved Meteorological Recorder

Acronym: IMET

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

Generic Description:

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 320 BR deepwater echosounder

Supplied Description:

Knudsen 320B/R with digital data logging and EPC graphic recorder. 12 kHz and 3.5 kHz transducers are 5 meters below the surface.

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 Name: SBE45 Thermosalinograph

Supplied Description:

The SBE45 Thermosalinograph is mounted in the main lab and connected to the clean seawater system. The intake for the system in in the bow dome ~5 meters below water level. 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.

Photosynthetically Available Radiation Sensor

Supplied Name: QSR 2200 Biospherical Instruments

Supplied Description:

Surface irradiance (or surface PAR) measured by Biospherical Instruments Inc. Model QSR-2240A.

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.

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 through the hull. Sensor is located in the bow chamber outboard of the UCSW pump, a few feet aft of the UCSW intake. Sensor housing is contained in an insulation jacket to limit the 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.

Speedlog

Supplied Description:

Model: Furuno DS-50 Doppler. The DS50 measures and displays the ship's over-the-ground or through-the-water speed based on the Doppler effect.

Instrument Type

Generic Name: Speedlog

Generic Description:

Measures Doppler near surface vessel speed through the water.

Weather Transmitter

Supplied Description:

Vaisala WXT520 MET sensors mounted on both port and starborad side of the forward mast 15.5 meters above the water line.

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

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
date	month, day, year in MM/DD/YY format (GMT time) e.g. 04/23/12 = April 23, 2012.	dimensionless	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 (knots) obtained from GPS (primary SOG data).	knots	sog
head	Ship's heading (degrees true); this is the ship's primary heading data. Originally named 'HDT'.	degrees true	heading
cog	Course-over-ground (true) in degrees obtained from the GPS.	degrees	cog
temp_ss5_2	Sea surface temperature measured by SBE45 sensor located in main lab. Intake located 5 meters below water level. Originally named'SBE45T'.	degrees C	temp_ss5
sal_ss	Sea surface salinity calculated from the temperature and conductivity values measured by the SBE45 (temp_ss5_2 and cond_mS). Calculations made in accordance with UNESCO 44. Originally named 'Salinity'.	PSU	sal_ss
month_gmt	Month of year (01-12), GMT. Values derived from the 'date' field.	dimensionless	month_gmt
day_gmt	Day of month (0-31), GMT. Values derived from the date field.	dimensionless	day_gmt
cond_mS	Sea surface conductivity from the primary source (SBE45). Originally named 'SSCND'.	mS/cm	cond_mS
sound_vel	Sea surface sound velocity calculated from salinity and temperature values (sal_ss and temp_ss5). Originally named 'SSV'.	m/s	sound_vel
wind_speed_r_port	Relative wind speed, port side, from the Vaisala WXT520. Wind sampling done at 2 Hz and averaged over 10 seconds. Originally named 'WXTP_Sm'.	m/s	wind_speed_r
wind_speed_r_stbd	Relative wind speed, stbd side, obtained from Vaisala WXT520. Wind sampling done at 2 Hz and averaged over 10 seconds. Originally named 'WXTS_Sm'.	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. Originally named 'WXTP_TS'.	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. Originally named 'WXTS_TS'.	m/s	wind_speed_c
wind_speed_c	True wind speed from primary wind sensor (IMET). Calculations use heading, sog, and cog values. Originally named 'Wnd_TS'.	m/s	wind_speed_c
year	year (YYYY format); derived from date column.	dimensionless	year
yrday	yearday; derived from date column.	dimensionless	yrday
temp_air_port	Air temperature in degrees C. Obtained from Vaisala WXT520 sensor mounted on forward mast, port side, 15.5 m above waterline. Originally named 'WXTP_TA'.	degrees C	temp_air
temp_air	Air temperature in degrees C. Originally named 'AT'.	degrees C	temp_air
depth_w_12	12 kHz depth (in meters) from sea surface obtained from the Knudsen bathymetry system. Originally named 'Depth12'.	m	depth_w
wind_dir_r_port	Relative wind direction from port-side Vaisala WXT520. Data 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. Originally named 'WXTP_Dm'.	degrees (ship relative)	wind_dir_r
wind_dir_r_stbd	Relative wind direction from stbd-side Vaisala WXT520. Data 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. Originally named 'WXTS_Dm'.	degrees (ship relative)	wind_dir_r
wind_dir_c_port	True wind direction in degrees, port side. Calculated from the Vaisala WXT520. Raw data corrected for sensor alignment error and combined with gyro heading, sog, and cog values. Originally named 'WXTP_TD'.	degrees	wind_dir_c
wind_dir_c_stbd	True wind direction in degrees, stbd side. Calculated from the Vaisala WXT520. Raw data corrected for sensor alignment error and combined with gyro heading, sog, and cog values. Originally named 'WXTS_TD'.	degrees	wind_dir_c
wind_dir_c	True wind direction from the primary sensor (IMET). Calculations use heading, sog, and cog data values. Originally named 'Wnd_TD'.	degrees	wind_dir_c
press_bar_port	Barometric pressure obtained from Vaisala WXT520. Data has been corrected for 15.5 meter mast height (0.1185 millibars per meter). Originally named 'WXTP_Pa'.	millibars	press_bar
press_bar	Barometric pressure obtained from primary source (IMET). Values have been corrected for 15.5 meter mast height (0.1185 millibars per meter). Originally named 'BPR'.	millibars	press_bar
precip_port	Rain accumulation in mm. Data obtained from Vaisala WXT520 mounted on forward mast, port side, 15.5 m above waterline. The accumulation value is reset only when the sensor power is reset. Originally named 'WXTP_Rc'.	mm	precip_level
precip_stbd	Rain accumulation in mm. Data obtained from Vaisala WXT520 mounted on forward mast, stbd side, 15.5 m above waterline. The accumulation value is reset only when the sensor power is reset. Originally named 'WXTS_Rc'.	mm	precip_level
precip_rate_port	Rain intensity in mm/hour obtained from Vaisala WXT520 mounted on forward mast, port side, 15.5 m above waterline. Originally named 'WXTP_Ri'.	mm/hr	precip_rate
precip_rate_stbd	Rain intensity in mm/hour obtained from Vaisala WXT520 mounted on forward mast, stbd side, 15.5 m above waterline. Originally named 'WXTS_Ri'.	mm/hr	precip_rate
humidity	Relative humidity (%) from best source. Sensor is mounted on the forward mast, 15.5 meters above the waterline. Originally named 'HRH'.	%	humidity
humidity_stbd	Relative humidity (%) obtained from Vaisala WXT520 mounted on forward mast, stbd side, 15.5 m above water line. Originally named 'WXTS_Ua'.	%	humidity
flr	Fluorescence measured by WetLabs Wet-Star fluorometer located in the Hydro Lab clean seawater piping. Measured in volts dc converted to MetraByte serial (count) data. 1 volt dc = +0100.00 counts.	counts	flr
radiation_s	Short wave radiation in watts/square-meter. The Eppley pyranometer has a wavelength range of 0.3 to 3 um. Sensor is mounted on bow mast 15.5 m above the waterline. Originally named 'SWR'.	watts/meter^2	radiation_s
radiation_l	Long wave radiation.	watts/meter^2	radiation_l
SPAR	Surface irradiance (or surface PAR) measured by QSR-2240A sensor. Surface irradiance values were calculated by dividing the net voltage reading by the calibration scale factor of 6.0452 V/(uE/cm^2/sec).	uE/cm^2/sec	SPAR
temp_ss5	Sea surface temperature from primary sensor (SBE48) located in the bow chamber ~5 meters below water level. Originally named 'SSTMP'.	degrees C	temp_ss5
sal_ss_SBE	Surface salinity from SBE45 located in main lab. This value is provided by the instrument rather than being calculated from the temperature and conductivity values. (For calculated salinity, see sal_ss.) Originally named 'SBE45S'.	PSU	sal_ss
speedlog	Ship speed through the water in knots, from the Furuno Speedlog. Originally named 'SPD'.	knots	speed_f_w

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Dataset: alongtrack