Dataset: CTD data - Eastern Tropical Pacific

Name: CTD data from R/V Seward Johnson and R/V Knorr cruises collected in the Tropical Eastern Pacific from 2007-2009 (ETP project)
Published: 2016-07-05
Keywords: oceans

Cite This Dataset

Spatial Extent: N:13.01877 E:-89.99778 S:8.99468 W:-105.01878

Temporal Extent: 2007-10-24

Project:

Collaborative Research: Zooplankton in the Redoxcline of the Cariaco Basin: Impact on Biogeochemical Cycling (ETP)

Program:

Ocean Carbon and Biogeochemistry (OCB)

Principal Investigator:

Kendra L. Daly (University of South Florida, USF)

Contact:

Kendra L. Daly (University of South Florida, USF)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

final

Version Date:

2016-07-05

Restricted:

Validated:

Yes

Current State:

Final no updates expected

CTD data from R/V Seward Johnson and R/V Knorr cruises collected in the Tropical Eastern Pacific from 2007-2009 (ETP project)

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Description

CTD profiles containing temperature, salinity, oxygen, fluorescence, beam attenuation & transmission, PAR and SPAR.

Methods & Sampling

A CTD-rosette was deployed between the surface (2 m) and up to a maximum depth depending on the bottom depth of the station. The CTD was deployed to ~ 2 m depth, the power turned on, and allowed to sit a few minutes until the pumps turned on and sensors stabilized and equilibrated. The CTD was then lowered at a rate of 30 m/min for the first 100 m, and thereafter at 60 m/min. Water column profiles and water sample collection often were made using two different CTD casts. Other CTD casts were for primary productivity measurements and to support McLane large volume filtration pump deployments.

Data Processing Description

Raw data were saved as hex files and converted to 1 m bin averaged data using the Sea-Bird Electronics Inc. Data Processing Software v.7.23.1.

BCO-DMO Processing Notes:
Lat and lon were corrected when there were errors in the data entry or they were changed to 'nd' when the GPS stream failed.

Data Files

File
etp_ctd.csv (Comma Separated Values (.csv), 29.52 MB) MD5:bc60cff6669e7a0365fd14c8f0144072 Primary data file for dataset ID 651131

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0526545

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KN195-02	KN0819502	2008-12-08	R/V Knorr	Kendra L. Daly (Chief Scientist)	data info
SJ07		2007-10-18	R/V Seward Johnson	Kendra L. Daly (Chief Scientist)	data info

Instruments

CTD Sea-Bird 9

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird 9

Acronym: CTD SBE 9

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

The Sea-Bird SBE 9 is a type of CTD instrument package. The SBE 9 is the Underwater Unit and is most often combined with the SBE 11 Deck Unit (for real-time readout using conductive wire) when deployed from a research vessel. The combination of the SBE 9 and SBE 11 is called a SBE 911. The SBE 9 uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 and SBE 4). The SBE 9 CTD can be configured with auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorometer, altimeter, etc.). Note that in most cases, it is more accurate to specify SBE 911 than SBE 9 since it is likely a SBE 11 deck unit was used. more information from Sea-Bird Electronics

Fluorometer

Supplied Name: C-Point chlorophyll fluorescence sensor

Supplied Description:

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.

Photosynthetically Available Radiation Sensor

Supplied Name: Biospherical underwater PAR QSP2300

Supplied Description:

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.

Photosynthetically Available Radiation Sensor

Supplied Name: Biospherical surface PAR QSR220

Supplied Description:

Instrument Type

Generic Name: Photosynthetically Available Radiation Sensor

Acronym: PAR sensor

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

Generic Description:

Pressure Sensor

Supplied Name: Seabird 9+ digital quartz pressure sensor

Supplied Description:

Instrument Type

Generic Name: Pressure Sensor

Generic Description:

A pressure sensor is a device used to measure absolute, differential, or gauge pressures. It is used only when detailed instrument documentation is not available.

Sea-Bird SBE 43 Dissolved Oxygen Sensor

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Sea-Bird SBE 43 Dissolved Oxygen Sensor

Acronym: SBE-43 DO

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0036/

Generic Description:

The Sea-Bird SBE 43 dissolved oxygen sensor is a redesign of the Clark polarographic membrane type of dissolved oxygen sensors. more information from Sea-Bird Electronics

Sea-Bird SBE-3 Temperature Sensor

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Sea-Bird SBE-3 Temperature Sensor

Acronym: SBE-3 Temperature

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

Generic Description:

The SBE-3 is a slow response, frequency output temperature sensor manufactured by Sea-Bird Electronics, Inc. (Bellevue, Washington, USA). It has an initial accuracy of +/- 0.001 degrees Celsius with a stability of +/- 0.002 degrees Celsius per year and measures seawater temperature in the range of -5.0 to +35 degrees Celsius. more information from Sea-Bird Electronics

Sea-Bird SBE-4 Conductivity Sensor

Supplied Name: Seabird 4C conductivity sensor

Supplied Description:

Instrument Type

Generic Name: Sea-Bird SBE-4 Conductivity Sensor

Acronym: SBE-4 Conductivity

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0417/

Generic Description:

The Sea-Bird SBE-4 conductivity sensor is a modular, self-contained instrument that measures conductivity from 0 to 7 Siemens/meter. The sensors (Version 2; S/N 2000 and higher) have electrically isolated power circuits and optically coupled outputs to eliminate any possibility of noise and corrosion caused by ground loops. The sensing element is a cylindrical, flow-through, borosilicate glass cell with three internal platinum electrodes. Because the outer electrodes are connected together, electric fields are confined inside the cell, making the measured resistance (and instrument calibration) independent of calibration bath size or proximity to protective cages or other objects.

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

Supplied Name: Wetlabs CST-721DR 25 cm pathlength transmissometer

Supplied Description:

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

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Cruise identifier	unitless	cruise_id
station	Station number	unitless	station
castno	Cast number	unitless	cast
lat_start	Latitude of station at time of cast	decimal degrees	lat_start
lon_start	Longitude of station at time of cast. West is negative	decimal degrees	lon_start
date_start	Date at start of cast. UTC	unitless	date_start
time_start	Time at start of cast. UTC	unitless	time
date	Date of sample. UTC	unitless	date
time	Time of sample. UTC	unitless	time
lon	Longitude of sample. West is negative	decimal degrees	lon
lat	Latitude of sample	decimal degrees	lat
depth	Depth of sample	meters	depth
temp	Primary temperature (ITS-90). Originally named t090C	degrees Celcius	temp
temp2	Secondary temperature (ITS-90). Originally named t190C	degrees Celcius	temp
potemp	Primary potential temperature (ITS-90). Originally named potemp090C	degrees Celcius	potemp
potemp2	Secondary potential temperature (ITS-90). Originally named potemp190C	degrees Celcius	potemp
sal	Salinity. Originally named sal00	practical salinity unit (PSU)	sal
cond	Primary conductivity. Originally named c0S/m	Siemens per meter	cond
cond2	Secondary conductivity. Originally named c1S/m	Siemens per meter	cond
sigma_e00	Primary sigma theta.	kilograms per meters cubed	sigma_theta
sigma_e11	Secondary sigma theta.	kilograms per meters cubed	sigma_theta
press	Pressure	decibars	press
O2_ml_L	Oxygen. Originally named sbeox0ML/L	mililiters per liter	O2_ml_L
O2_mg_L	Oxygen. Originally named sbeox0Mg/L	miligrams per liter	O2_mg_L
O2_sat_pcnt	Oxygen saturation. Originally named sbeox0PS	percent	O2_sat_pcnt
O2_umol_kg	Oxygen. Originally named sbeox0Mm/Kg	micromoles per kilogram	O2_umol_kg
sound_vel_Chen	Sound velocity. Calculated using Chen and Millero (1977) formula. Parameter originally named svCM.	meters per second	sound_vel
sound_vel_Delgrosso	Sound velocity. Calculated using Del Grosso (1974) formula. Parameter originally named svDM.	meters per second	sound_vel
sound_vel_Wilson	Sound velocity. Calculated using Chen and Millero (1977) formula. Parameter originally named svCM.	meters per second	sound_vel
beam_c	Beam Attenuation Chelsea/Seatech. Parameter orginally named bat.	per meter	beam_c
trans	Beam Transmission. Parameter originally named xmiss.	percent	trans
cpar	Corrected Irradiance	percent	no_bcodmo_term
fluor	Fluorescence (Seapoint). Parameter originally named flSP	miligrams per meter cubed	fluor
par	Photosynthetically Active Radiation (Biospherical/Licor)	microEinsteins per meter squared per second	PAR
spar	Surficial Photosynthetically Active Radiation	microEinsteins per meter squared per second	SPAR
ISO_DateTime_UTC	UTC date and time at start of cast. Formatted using the ISO standard (YYYY-MM-DDTHH:MM:SS[.xx]Z)	unitless	ISO_DateTime_UTC

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Database

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Dataset: CTD data - Eastern Tropical Pacific