Dataset: McMurdo Sound CTDs
Deployment: McMurdo_CTDs_2012-2014

CTD casts in McMurdo Sound

Principal Investigator:

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

Co-Principal Investigator:

David G. Ainley (H.T. Harvey & Associates)

Grant Ballard (Point Blue Conservation Science)

Stacy Kim (Moss Landing Marine Laboratories, MLML)

Contact:

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

BCO-DMO Data Manager:

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

Project:

Food web dynamics in an intact ecosystem: the role of top predators in McMurdo Sound (McMurdo Predator Prey)

Data URL:

https://www.bco-dmo.org/dataset-deployment/680971/data

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Description

This dataset includes temperature, salinity, conductivity, oxygen, depth, sound velocity, chlorophyll fluorescence, and pH measurements from McMurdo Sound, Antarctica. Data were collected by CTD, fluorescence, and pH sensors during austral years 2012/2013 and 2014/2015

Methods & Sampling

Dataset acquisition description

A small hole was drilled in the McMurdo Sound fast ice. The CTD was deployed below the fast ice to ~ 2 m depth. The CTD was then powered on and allowed to sit a few minutes until the pumps turned on and sensors stabilized and equilibrated. The CTD was then lowered using a hand winch to depths between 97 and 175 m.

Deployment-specific acquisition description

CTD casts in McMurdo Sound. For calibration information and specific instrument models used please consult the CTD header files (ZIP, 131 files, 440 KB total)

Data Processing Description

Dataset Processing Description

These data are not quality controlled. The oxygen sensor failed at some point during both 2012 and 2014. The conductivity sensor calibrations did not show significant drift, however, a bad cable in 2014 likely caused intermittent data spikes.

There are no fluorescence values in these data for 2012 and the beginning of 2014. The first station with fluorescence is station 108 in 2014. There are no pH values in the 2014 data.

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. For calibration and instrument information please consult the CTD header files (ZIP, 131 files, 440 KB total). The header files contain header lines generated by Sea-Bird processing software for each cast.

The "Parameter" section of this dataset landing page provides the data parameter names currently used in this data version as well as the original name used in the Sea-Bird Data Processing Software.

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values replaced with no data value 'nd'
* data from Jan 02 2013 15:00 had some trailing commas and/or extra values at end of lines (0.0). Characters after the last comma were removed.
* v0 Voltage 0 was duplicated with same variable name, values, and description. Removed second instance
* For station 212, austral season 2014 the time was in elapsed seconds so added the time in hh:mm instead to match other files. Got the time from a date time string column (timeJ) in the original file.
* Date format converted to ISO Date format (source timeJ)
* Data version 2017-05-04 is an update of version 2017-02-08 that includes variable name changes in the data and a timestamp change from local to UTC. Time and date now called time_local, date_local. Other variables are now more descriptive for example "depSM" is now "depth." Added time zone offset parameter.

More information about this dataset deployment

Funding

Award Number	Funding Source
PLR-0944511	NSF Division of Polar Programs

Instruments

CTD Sea-Bird SBE SEACAT 19plus

Supplied Name: Seabird SBE 19 Plus

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird SBE SEACAT 19plus

Acronym: Sea-Bird SEACAT 19 Plus

Generic Description:

Self contained self powered CTD profiler. Measures conductivity, temperature and pressure in both profiling (samples at 4 scans/sec) and moored (sample rates of once every 5 seconds to once every 9 hours) mode. Available in plastic or titanium housing with depth ranges of 600m and 7000m respectively. Minature submersible pump provides water to conductivity cell.

Niskin bottle

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

pH Sensor

Supplied Name: Sea-Bird SBE-27 pH sensor

Supplied Description:

Instrument Type

Generic Name: pH Sensor

Generic Description:

An instrument that measures the hydrogen ion activity in solutions.

The overall concentration of hydrogen ions is inversely related to its pH. The pH scale ranges from 0 to 14 and indicates whether acidic (more H+) or basic (less H+).

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

Wet Labs ECO-AFL/FL Fluorometer

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Wet Labs ECO-AFL/FL Fluorometer

Acronym: ECO AFL/FL

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0172/

Generic Description:

The Environmental Characterization Optics (ECO) series of single channel fluorometers delivers both high resolution and wide ranges across the entire line of parameters using 14 bit digital processing. The ECO series excels in biological monitoring and dye trace studies. The potted optics block results in long term stability of the instrument and the optional anti-biofouling technology delivers truly long term field measurements.
more information from Wet Labs

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
austral_year	Austral season sampled	unitless	year
station	Sampling station identifier	unitless	station
cast	CTD cast identifier	unitless	cast
lat	Latitude of sample; north is positive	decimal degrees	lat
lon	Longitude of sample; west is negative	decimal degrees	lon
depth	Depth of sample. Originally named "depSM."	meters	depth
ISO_DateTime_UTC	ISO timestamp based on the ISO 8601:2004(E) standard in format YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC)	unitless	ISO_DateTime_UTC
date_local	Local date in format yyyy-mm-dd	unitless	date
time_local	Local time in format hh:mm:ss	unitless	time
time_zone_offset	Time offset in hours from UTC to local time at McMurdo Station.	unitless	time_zone
temp	Temperature (ITS-90). Originally named "tv290C."	degrees Celsius	temp
potemp	Primary potential temperature (ITS-90). Originally named "potemp090C."	degrees Celsius	potemp
sal	Salinity. Originally named "sal00."	practical salinity unit (PSU)	sal
cond_S_m	Conductivity. Originally named "c0S/m."	Siemens per meter (S/m)	cond
cond_mS_cm	Conductivity. Originally named "c0mS/cm."	millisiemens per centimeter (mS/cm)	cond
density	Density. Originally named "density00."	kilograms per meter cubed (kg/m^3)	density
sigma_theta	Sigma-theta density. Originally named "sigma_e00."	kilograms per meters cubed	sigma_theta
sigma_t	Sigma-t density. Originally named "sigma_t00."	kilograms per meters cubed	sigma_t
press	Pressure (Strain Gauge). Originally named "prdM."	decibars (db)	press
O2_mL_L	Dissolved oxygen. Originally named "sbeox0ML/L."	milliliters per liter (ml/l)	O2_ml_L
O2_mg_L	Dissolved oxygen. Originally named "sbeox0Mg/L."	milligrams per liter (mg/l)	O2_mg_L
O2_umol_kg	Dissolved oxygen. Originally named "sbeox0Mm/Kg."	micromoles per kilogram (umol/kg)	O2_umol_kg
O2_sat	Oxygen saturation. Originally named "sbeox0PS."	percent	O2sat
fluor	Fluorescence (from WET Labs ECO-AFL/FL). Originally named "flECO-AFL."	milligrams per meter cubed (mg/m^3)	fluor
pH	pH. Originally named "ph."	pH units	pH
flag	Quality flag	unitless	flag
sound_vel_CM	Sound velocity. Calculated using Chen and Millero (1977) formula. Originally named "svCM."	meters per second	sound_vel
sound_vel_DM	Sound velocity. Calculated using Del Grosso (1974) formula. Originally named "svDM."	meters per second	sound_vel
sound_vel_WM	Sound velocity. Calculated using Wilson (1960) formula. Originally named "svWM."	meters per second	sound_vel
avg_sound_vel_CM	Average sound velocity. Calculated using Chen and Millero (1977) formula. Originally named "avgsvCM."	meters per second	sound_vel
avg_sound_vel_DM	Average sound velocity. Calculated using Del Grosso (1974) formula. Originally named "avgsvDM."	meters per second	sound_vel
avg_sound_vel_WM	Average sound velocity. Calculated using Wilson (1960) formula. Originally named "avgsvWM."	meters per second	sound_vel

Database

Contribute Data

Dataset: McMurdo Sound CTDs
Deployment: McMurdo_CTDs_2012-2014

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: McMurdo Sound CTDsDeployment: McMurdo_CTDs_2012-2014

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Dataset: McMurdo Sound CTDs
Deployment: McMurdo_CTDs_2012-2014