Dataset: CTD hydrocast data

Name: CTD casts collected at station Kahe and ALOHA between June 15 and June 24, 2019 onboard R/V Kilo Moana cruise KM1910.
Published: 2022-01-12
Keywords: Chief Scientist Training, EAGER, CTD, ALOHA, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.854106.1

Spatial Extent: N:22.8327 E:-157.922 S:21.3433 W:-158.424

Temporal Extent: 2019-06-16 - 2019-06-24

Project:

EAGER Collaborative Research: Early career chief scientist training for biological and chemical oceanographers (Chief Sci KM1910)

Principal Investigator:

Matthew J. Church (University of Montana)

Co-Principal Investigator:

Erica Goetze (University of Hawai'i, UH)

Contact:

Matthew J. Church (University of Montana)

BCO-DMO Data Manager:

Karen Soenen (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2022-01-12

Restricted:

Validated:

Yes

Current State:

Final no updates expected

CTD casts collected at station Kahe and ALOHA between June 15 and June 24, 2019 onboard R/V Kilo Moana cruise KM1910.

Abstract:

CTD hydrocast data from KM1910. Dataset includes up- and down-cast vertical profiles of pressure, temperature, salinity, dissolved oxygen, chloropigment fluorescence, beam transmissometry, and photosynthetically active radiation from all CTD rosette casts conducted during the cruise (22 discrete casts).

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2022-01-12	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.854106.1	2022-01-12

Methods & Sampling

The CTD rosette package consisted of a 24-place carousel and an aluminum rosette frame equipped with 24 12-L PVC bottles. The CTD and rosette were deployed on a 3-conductor cable (0.322 cm) collecting data at 24 Hz. Raw data were stored on both a shipboard server and laptop computer.

The CTD rosette was equipped with: SeaBird CTD (conductivity, temperature, depth), SeaPoint chlorophyll fluorometer, SBE dissolved oxygen, beam tranmissometer (C-star) and PAR sensor.

Data Processing Description

CTD data were processed and quality controlled following Hawaii Ocean Time-series protocols.

CTD data were quality controlled and screened for spikes when the CTD rosette speed was less than 0.25 m s-1 or its acceleration was greater than 0.25 m s. Data were averaged into 2 dbar pressure bins.

CTD-based dissolved oxygen measurements were calibrated to discrete oxygen samples measured on the ship by Winkler titration. Discrete bottle oxygen samples were collected and analyzed using a computer-controlled potentiometric end-point titration procedure. Precision of the Winkler titration method averages ~0.2%. The calibration procedure consists of fitting a non-linear equation to the CTD oxygen current and oxygen temperature.

Similarly, the SeaPoint fluorescence measurements were calibrated, post-cruise, to discrete bottle samples collected from selected hydrocasts. CTD sensor drift was corrected via calibration with bottle fluorometric chlorophyll a plus accessory pheopigments analyzed at the shore based laboratory using a Turner Designs Model 10-AU fluorometer. A linear relationship of the form, Vchl = b·Vfluor + a, was used to convert all fluorescence data to chloropigment.

BCO-DMO Processing Description:

* Merged all individual CTD files
* Combined CTD files with the eventlog, adding the latitude, longitude, times, cast number, station number and event number.
* Converted times to ISO format and Zulu times (HST to UTC time).
* Adjusted column names to comply with database requirements.

Data Files

File
ctd_casts_all.csv (Comma Separated Values (.csv), 4.65 MB) MD5:d5e1d748998327c6a128ac961f3adf0c Primary data file for dataset ID 854106

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1911831

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KM1910	EAGER Chief Sci cruise 2019 Chief Scientist Training Cruise	2019-06-15	R/V Kilo Moana	Matthew J. Church (Chief Scientist) Erica Goetze (Co-Chief Scientist) Angelicque E. White (Co-Chief Scientist)	data info

Instruments

Biospherical PAR sensor

Supplied Name: Biospherical QSP-2300 Log Scalar PAR sensor

Supplied Description:

Instrument Type

Generic Name: Biospherical PAR sensor

Generic Description:

An irradiance sensor designed to measure Photosynthetically Active Radiation (PAR), manufactured by Biospherical Instruments Inc.

Sea-Bird SBE 43 Dissolved Oxygen Sensor

Supplied Name: Conductivity Sensor - SBE Model 4-02/0 (dual)

Supplied Description:

Conductivity Sensor - SBE Model 4-02/0 (dual)

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: Temperature Probe – SBE Model 3-02/F (dual)

Supplied Description:

Temperature Probe – SBE Model 3-02/F (dual)

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: Conductivity Sensor - SBE Model 4-02/0 (dual)

Supplied Description:

Conductivity Sensor - SBE Model 4-02/0 (dual)

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 C-Star 25cm

Supplied Description:

Wetlabs C-Star 25cm

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
event_id	Cruise number (KM1910), Station number, CTD Cast number	unitless	ev_code
ctd_direction	Up or down cast	unitless	sample_descrip
event_number	Cruise event number	unitless	ev_code
station_number	Station 1 = Kahe, Station 2= ALOHA	unitless	station
cast_number	CTD cast number	unitless	cast
latitude_in	Latitude at beginning of CTD cast, south is negative	decimal degrees	lat
longitude_out	Longitude at end of CTD cast, west is negative	decimal degrees	lon
ISO_DateTime_UTC_In	Date/Time (UTC) at beginning of CTD cast in ISO format (YYYY-MM-DDTHH:MMZ) Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
ISO_DateTime_UTC_Out	Date/Time (UTC) at end of CTD cast in ISO format (YYYY-MM-DDTHH:MMZ) Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
CHLPIG	Chloropigment	micrograms/L	pigment_conc
CTDPRS	Pressure	decibar	press
CTDTMP	Temperature	ITS-90	temp
CTDSA	Salinity	PSS-78	sal
CTDOXY	Dissolved Oxygen	umole/L	O2
PAR	Photosynthetically active radiation	Volts	PAR
BEAM_AT	Beam transmission	per meter	trans
XMISS	Percent transmission	percentage (%)	trans
NUMBER	Number of observations	unitless	numb_obs
QUALT1	Quality flags	unitless	q_flag

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Database

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Dataset: CTD hydrocast data