Dataset: LB_2012_Glider_CTD

Name: CTD data from gliders on the R/V Savannah in the South Atlantic Bight (SAB) continental shelf off Long Bay (-79W, 32N; -77W, 34 N) collected from January to April 2012 (Long Bay Wintertime Bloom project)
Published: 2014-12-18
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.544615.1

Spatial Extent: N:32.95739 E:-78.05085 S:32.84347 W:-78.14255

Temporal Extent: 2012-01-25

Project:

Mechanisms of nutrient input at the shelf margin supporting persistent winter phytoplankton blooms downstream of the Charleston Bump (Long Bay Wintertime Bloom)

Principal Investigator:

James Nelson (Skidaway Institute of Oceanography, SkIO)

Co-Principal Investigator:

Catherine Edwards (Skidaway Institute of Oceanography, SkIO)

Harvey E. Seim (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

Contact:

Sara Haines (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2014-12-18

Restricted:

Validated:

Yes

Current State:

Final no updates expected

CTD data from gliders on the R/V Savannah in the South Atlantic Bight (SAB) continental shelf off Long Bay (-79W, 32N; -77W, 34 N) collected from January to April 2012 (Long Bay Wintertime Bloom project)

Abstract:

Two Webb Slocum gliders were used to measure salinity, temperature, and depth. Glider 'Pelagia' was deployed in Long Bay, S. Carolina, South Atlantic Bight and glider 'Ramses' was deployed along the upper slope of S. Carolina. in 2012. Data were collected in a time series from January to April, 2012.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2014-12-18	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.544615.1	2021-03-01

Data Processing Description

Data was read from glider stored memory after recovery.

Quality control (QC) steps applied to CTD data (bad flag means values were replaced with NaN in the matlab files):

1. data when glider was in testing modes or at the surface were bad flagged.
2. obvious spikes in temperature and conductivity were bad flagged based on a difference threshold
3. salinity errors were significant due to the unpumped conductivity cell and were corrected following Garau et al., 2011. Matlab scripts available at http:// www.socib.es/;glider/doco/gliderToolbox/ctdTools/ thermalLagTools) were used with modified parameters as specified in the data file under config.thermal_lag_correction_parameters to create salinCorrected and densCorrected.
4. poor flushing of the conductivity cell and thus invalid salinity data were found to occur when the glider forward speed fell below 10 cm/s or the pitch was between +5 and +15 degrees (on an upcast). All CTD output values were bad flagged during these times.

Salinity (salin) was calculated from conductivity using PSS-78, as well as water density (dens) using the seawater routines.

Normally, density should not be archived with data submission to national repository. However since this parameter is integral to the main study, density is being reported with other measured parameters but with caveat that it is derived based on older conventions.

BCO-DMO Processing:
-extracted data from MatLab .mat files
-added conventional header with dataset name, PI name, version date, reference information
-renamed parameters to BCO-DMO standard
-added yrday_utc and ISO_DateTime_UTC to served view
-reduced number of significant digits

Data Files

File
glider_CTD_jgof.csv (Comma Separated Values (.csv), 418.52 MB) MD5:3ba63383fbc333c3313fcb5b3f59ca1c Primary data file for dataset ID 544615

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1032276
NSF Division of Ocean Sciences	OCE-1032285

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
LB_2012_Pelagia-1		2012-01-26	AUV Slocum Glider Pelagia	Catherine Edwards (Co-Chief Scientist) James Nelson (Co-Chief Scientist)	data info
LB_2012_Pelagia-2		2012-02-16	AUV Slocum Glider Pelagia	James Nelson (Principal Investigator)	data info
LB_2012_Pelagia-3		2012-03-16	AUV Slocum Glider Pelagia	Catherine Edwards (Chief Scientist) James Nelson (Co-Chief Scientist)	data info
LB_2012_Ramses-1		2012-01-26	AUV Slocum Glider Ramses	Catherine Edwards (Co-Chief Scientist) James Nelson (Co-Chief Scientist)	data info
LB_2012_Ramses-2		2012-02-15	AUV Slocum Glider Ramses	Catherine Edwards (Co-Chief Scientist) James Nelson (Co-Chief Scientist)	data info
LB_2012_Ramses-3		2012-03-16	AUV Slocum Glider Ramses	Catherine Edwards (Co-Chief Scientist) James Nelson (Co-Chief Scientist)	data info
SAV-12-03	LB 2012 Leg 1 Cruise	2012-01-24	R/V Savannah	James Nelson (Chief Scientist) Catherine Edwards (Co-Chief Scientist)	data info
SAV-12-05	LB 2012 Leg 2 Cruise	2012-02-13	R/V Savannah	James Nelson (Chief Scientist) Catherine Edwards (Co-Chief Scientist)	data info
SAV-12-11	LB 2012 Leg 3 Cruise	2012-03-13	R/V Savannah	James Nelson (Chief Scientist) Catherine Edwards (Co-Chief Scientist)	data info
SAV-12-14	LB 2012 Recovery Cruise	2012-04-02	R/V Savannah	James Nelson (Chief Scientist) Catherine Edwards (Co-Chief Scientist)	data info

Instruments

CTD Sea-Bird

Supplied Description:

The CTD is a component of the Slocum glider used for this dataset.

Instrument Type

Generic Name: CTD Sea-Bird

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

Generic Description:

Conductivity, Temperature, Depth (CTD) sensor package from SeaBird Electronics, no specific unit identified. This instrument designation is used when specific make and model are not known. See also other SeaBird instruments listed under CTD. More information from Sea-Bird Electronics.

Global Positioning System Receiver

Supplied Name: GPS

Supplied Description:

GPS is a component of the Slocum glider used for this dataset.

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.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
glider_id	glider identification	unitless	Glider_ID
year	year	yyyy	year
month_utc	UTC month	1-12	month_utc
day_utc	UTC day	1-31	day_utc
yrday_utc	UTC day and decimal time: e.g. 326.5 for the 326th day of the year or November 22 at 1200 hours (noon)	unitless	yrday_utc
hour	UTC hour	HH	hour_gmt
min	UTC minute	MM	minute_gmt
sec	UTC second	SS.fraction of second	seconds_gmt
lat	latitude; north is positive	decimal degrees	lat
lon	longitude; east is positive	decimal degrees	lon
depth	depth	meters	depth
press	pressure	decibars	press
temp	temperature	degrees Celsius	temp
dens_corr	corrected density	kilograms/meter^3	density
sal_corr	corrected salinity	PSU	sal
ISO_DateTime_UTC	Date/Time (UTC) ISO formatted	yyyy-mm-ddTHH:MM:SS[.xx]Z	ISO_DateTime_UTC
lat_start	latitude at start of glider deployment.	decimal degrees	lat_start
lon_start	longitude at start of glider deployment; east is positive.	decimal degrees	lon_start

Status message

Database

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Dataset: LB_2012_Glider_CTD