Dataset: CTD_fv

Name: CTD data from the Gulf of Maine in 1998 from three cruises on the R/V Susan and Caitlyn - SC9801, SC9802, and SC9803 - in the Gulf of Maine and Georges Bank as part of the U.S. GLOBEC program (GB project)
Published: 2005-03-16
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.2419.1

Spatial Extent: N:43.6182 E:-69.5615 S:42.6162 W:-69.7167

Temporal Extent: 1998-02-21 - 1998-06-02

Project:

U.S. GLOBEC Georges Bank (GB)

Program:

U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)

Co-Principal Investigator:

Frank Bub (University of New Hampshire, UNH/OPAL)

Ann Bucklin (University of New Hampshire, UNH/OPAL)

James P. Manning (Northeast Fisheries Science Center - Woods Hole, NOAA NEFSC)

BCO-DMO Data Manager:

Ms Dicky Allison (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2005-03-16

Restricted:

Validated:

Yes

Current State:

Final no updates expected

CTD data from the Gulf of Maine in 1998 from three cruises on the R/V Susan and Caitlyn - SC9801, SC9802, and SC9803 - in the Gulf of Maine and Georges Bank as part of the U.S. GLOBEC program (GB project)

Abstract:

CTD data from the Gulf of Maine in 1998 from three cruises on the R/V Susan and Caitlyn - SC9801, SC9802, and SC9803 - in the Gulf of Maine and Georges Bank as part of the U.S. GLOBEC program.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2005-03-16	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.2419.1	2019-10-28

Description

The UNH SeaBird SBE-25 SeaLogger measures:

Temperature (degrees C) with a SeaBird SBE-3F.
Conductivity (Siemens/m) with a SeaBird SBE-4C.
Pressure (decibars) with a SBE 29 strain gage sensor.
Percent light transmission with a Wet Labs CST-126R transmissometer across a 25 cm distance at the red light wavelength 660 nm. Data are presented as a percentage relative to pure water.
Chlorophyll concentration in micrograms/liter with a Wet Labs WETStar Fluorometer model 9607003.
PAR (photosynthetically active radiation) with a Biospherical QPS-200PD which observes an upper hemispherical total irradiance in quanta/sq-cm/sec.
Dissolved oxygen with a SBE-23Y (Yellow Springs Instrument) in milliliters/liter.

During a cast, sensors are flushed with a SBE-5T pump at approximately 25 ml/s. The system samples and stores all data at 8 Hz (8 samples/ second). Profiling rates should be 20 meters/minute for an average of 24 samples/1 m pressure level. Normally only the downcasts are analyzed (unless a problem is noted). Sensors are factory calibrated annually.

Derived data are calculated using Matlab and/or UNH algorithms developed in accordance with standards prescribed by Fofonoff and Millard, 1983.

For additional information about the SC9801 cruise see the NOAA Coastal Ocean Program Progress Report

Additional data processing notes were provided by the contributor. Note: These notes reflect the CTD processing steps for data collected during the UNH CONVEX progam. However, they are indicative of the processing performed on the data reported here. Parameter names have been changed to agree with GLOBEC requirements.

Methods & Sampling

The UNH SeaBird SBE-25 SeaLogger measures:

Temperature (degrees C) with a SeaBird SBE-3F.
Conductivity (Siemens/m) with a SeaBird SBE-4C.
Pressure (decibars) with a SBE 29 strain gage sensor.
Percent light transmission with a Wet Labs CST-126R transmissometer across a 25 cm distance at the red light wavelength 660 nm. Data are presented as a percentage relative to pure water.
Chlorophyll concentration in micrograms/liter with a Wet Labs WETStar Fluorometer model 9607003.
PAR (photosynthetically active radiation) with a Biospherical QPS-200PD which observes an upper hemispherical total irradiance in quanta/sq-cm/sec.
Dissolved oxygen with a SBE-23Y (Yellow Springs Instrument) in milliliters/liter.

Data Processing Description

Note: The Brunt-Vaisala Frequency (N-squared) data were reprocessed by Frank Bub with raw data calculated over 1 m intervals, rather than smoothed over 5 m bins. The 5 m bins did not work well with inshore profiles. Negative numbers indicate instability. Use data with caution.

Derived data are calculated using Matlab and/or UNH algorithms developed in accordance with standards prescribed by Fofonoff and Millard, 1983.

Data Files

File
ctd_fv.csv (Comma Separated Values (.csv), 259.56 KB) MD5:14edbe4cc12c450265ac7d0ec65b6226 Primary data file for dataset ID 2419

More Information about this dataset

Funding Sources

Funding Source	Award Number
National Science Foundation	unknown GB NSF
National Oceanic and Atmospheric Administration	unknown GB NOAA

Deployments

Deployment	Start Date	Platform	Investigator
SC9801	1998-02-21	R/V Susan and Caitlyn	James J. Pierson (Chief Scientist) Frank Bub (Co-Principal Investigator) Ann Bucklin (Co-Principal Investigator) James P. Manning (Co-Principal Investigator) Craig Pendleton (Captain) James J. Pierson (Technician)	data info
SC9802	1998-04-26	R/V Susan and Caitlyn	James J. Pierson (Chief Scientist) Frank Bub (Co-Principal Investigator) Ann Bucklin (Co-Principal Investigator) James P. Manning (Co-Principal Investigator) Craig Pendleton (Captain) James J. Pierson (Technician)	data info
SC9803	1998-06-02	R/V Susan and Caitlyn	James J. Pierson (Chief Scientist) Frank Bub (Co-Principal Investigator) Ann Bucklin (Co-Principal Investigator) James P. Manning (Co-Principal Investigator) Craig Pendleton (Captain) James J. Pierson (Technician)	data info

Instruments

CTD Sea-Bird 25

Supplied Name: CTD Seabird 25

Supplied Description:

The UNH SeaBird SBE-25 SeaLogger measures - Temperature (degrees C) with a SeaBird SBE-3F. Conductivity (Siemens/m) with a SeaBird SBE-4C. Pressure (decibars) with a SBE 29 strain gage sensor. Percent light transmission with a Wet Labs CST-126R transmissometer across a 25 cm distance at the red light wavelength 660 nm. Data are presented as a percentage relative to pure water. Chlorophyll concentration in micrograms/liter with a Wet Labs WETStar Fluorometer model 9607003. PAR (photosynthetically active radiation) with a Biospherical QPS-200PD which observes an upper hemispherical total irradiance in quanta/sq-cm/sec. Dissolved oxygen with a SBE-23Y (Yellow Springs Instrument) in milliliters/liter.During a cast, sensors are flushed with a SBE-5T pump at approximately 25 ml/s. The system samples and stores all data at 8 Hz (8 samples/ second). Profiling rates should be 20 meters/minute for an average of 24 samples/1 m pressure level. Normally only the downcasts are analyzed (unless a problem is noted). Sensors are factory calibrated annually.

Instrument Type

Generic Name: CTD Sea-Bird 25

Acronym: CTD SBE 25

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0040/

Generic Description:

The Sea-Bird SBE 25 SEALOGGER CTD is battery powered and is typically used to record data in memory, eliminating the need for a large vessel, electrical sea cable, and on-board computer. All SBE 25s can also operate in real-time, transmitting data via an opto-isolated RS-232 serial port. Temperature and conductivity are measured by the SBE 3F Temperature sensor and SBE 4 Conductivity sensor (same as those used on the premium SBE 9plus CTD). The SBE 25 also includes the SBE 5P (plastic) or 5T (titanium) Submersible Pump and TC Duct. The pump-controlled, TC-ducted flow configuration significantly reduces salinity spiking caused by ship heave, and in calm waters allows slower descent rates for improved resolution of water column features. Pressure is measured by the modular SBE 29 Temperature Compensated Strain-Gauge Pressure sensor (available in eight depth ranges to suit the operating depth requirement). The SBE 25's modular design makes it easy to configure in the field for a wide range of auxiliary sensors, including optional dissolved oxygen (SBE 43), pH (SBE 18 or SBE 27), fluorescence, transmissivity, PAR, and optical backscatter sensors. More information from Sea-Bird Electronics: http:www.seabird.com.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruiseid	cruise identification, i.e. SC9801		no_bcodmo_term
si	scientific investigator's name		no_bcodmo_term
station	station number		station
lat	latitude, negative = South	decimal degrees	lat
lon	longitude, negative = West	decimal degrees	lon
time_gmt	time, at bottom of cast	HHmm, GMT	time_gmt
day_gmt	day of month	GMT	day_gmt
month_gmt	month of year	GMT	month_gmt
year	year	GMT	year
depth_w	depth of water	meters	depth_w
nbin	number of data cycles per press/bin average		nbin
press	depth of sample as pressure	decibars	press
temp	temperature	degrees centigrade	temp
sal	salinitiy	PSU	sal
sigma_0	sigma-theta, potential density	kilograms/meter³	sigma_0
depth	sample depth	decimal meters	depth
potemp	potential temperature	degrees centigrade	potemp
cond	conductivity	siemens/meter	cond
light_trans	light transmission, using a transmissometer	per cent	no_bcodmo_term
fluor	fluorescence, chlorophyll conc.	micrograms/liter	fluor
par_scalar	photosynthetically active radiation, scalar (400-700nm)	microEinsteins/second/meter²	par_scalar
o2	dissolved oxygen	milliliters/liter	O2
bvfq	Brunt-Vaisaila Frequency (N-squared)	1/second²	bvfq
dynh_0	dynamic height, ref. to surface	meters	dynh_0
sound_vel			sound_vel

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