Dataset: LB_2012_Mooring_CTD

Name: CTD data from moorings in the South Atlantic Bight (SAB) continental shelf off Long Bay, collected from December 2011 to April 2012 (Long Bay Wintertime Bloom project)
Published: 2014-12-18
Keywords: oceans

Cite This Dataset

Spatial Extent: N:33.1695 E:-78.0132 S:32.8524 W:-78.3334

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:

2014-12-18

Version Date:

2014-12-18

Validated:

Yes

Current State:

Final no updates expected

CTD data from moorings in the South Atlantic Bight (SAB) continental shelf off Long Bay, collected from December 2011 to April 2012 (Long Bay Wintertime Bloom project)

Expand/Collapse All

Description

Time series of near-bottom salinity, temperature, and depth measured every 5 minutes (300sec) by a SeaBird Electronics CTD (SBE-SMP37) mounted on bottom frame of three moorings located at Long Bay, S. Carolina in the South Atlantic Bight.

Data Processing Description

Data read from SeaBird SMP37 ascii format downloaded from each CTD.

Quality control (QC) steps applied to CTD data using flag of Not-a-Number (NaN) are as follows:

1. removed data when bottom frame not at deployment depth (trim beginning and end values)
2. evaluate sensors (cond, depth, temperature within tolerances), and flagged when outside tolerance
3. manually flagged data when particular sensor exhibited obvious biofouling or failure.
a. Specifically for LB1 CTD at 30m the conductivity cell was fouled on Feb 12, 2012

After QC, salinity (sal) converted from conductivity using PSS-78, water density (dens) calculated from Absolute Salinity, in situ temperature and pressure using TEOS-10 and depth from pressure at the original sampling interval of 300 seconds (5min). These conversions and derived density were calculated using gsw Oceanographic Toolbox (version 3.01) for MATLAB (IOC, SCOR and IAPSO, 2010).

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 TEOS-10.

References:

IOC, SCOR and IAPSO, 2010: The international thermodynamic equation of seawater - 2010: Calculation and use of thermodynamic properties. Intergovernmental Oceanographic Commission, Manuals and Guides No. 56, UNESCO (English), 196 pp. Available from http://www.TEOS-10.org.

BCO-DMO Processing:

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

Data Files

File
moorings_CTD.csv (Comma Separated Values (.csv), 7.33 MB) MD5:2566a1bbb26b5965598096f085ed57fa Primary data file for dataset ID 544697

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	Start Date	Platform	Investigator
LB_2012_LB1	2012-01-20	LB1 Mooring	James Nelson (Chief Scientist) Catherine Edwards (Co-Chief Scientist)	data info
LB_2012_LB2	2012-01-19	LB2 Mooring	James Nelson (Chief Scientist) Catherine Edwards (Co-Chief Scientist)	data info
LB_2012_LB3	2011-12-14	LB3 Mooring	James Nelson (Chief Scientist) Catherine Edwards (Co-Chief Scientist) Harvey E. Seim (Contact)	data info

Instruments

CTD Sea-Bird MicroCAT 37

Supplied Name: CTD MicroCAT 37

Supplied Description:

SeaBird Electronics CTD (SBE-SMP37). Sampling was set for every 300 seconds (5min).
LB1: s/n 1602, mounted on a bottom frame at nominal depth of 30m.
LB2: s/n 1670 was mounted on a bottom frame at nominal depth of 76m.
LB3: s/n 1986 was mounted on a bottom frame at nominal depth of 171m.

Instrument Type

Generic Name: CTD Sea-Bird MicroCAT 37

Acronym: CTD MicroCAT 37

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/350/

Generic Description:

The Sea-Bird MicroCAT CTD unit is a high-accuracy conductivity and temperature recorder based on the Sea-Bird SBE 37 MicroCAT series of products. It can be configured with optional pressure sensor, internal batteries, memory, built-in Inductive Modem, integral Pump, and/or SBE-43 Integrated Dissolved Oxygen sensor. Constructed of titanium and other non-corroding materials for long life with minimal maintenance, the MicroCAT is designed for long duration on moorings.

In a typical mooring, a modem module housed in the buoy communicates with underwater instruments and is interfaced to a computer or data logger via serial port. The computer or data logger is programmed to poll each instrument on the mooring for its data, and send the data to a telemetry transmitter (satellite link, cell phone, RF modem, etc.). The MicroCAT saves data in memory for upload after recovery, providing a data backup if real-time telemetry is interrupted.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
mooring_id	mooring identification	unitless	mooring
year	year	yyyy	year
month_utc	UTC month	mm	month_utc
day_utc	UTC day	dd	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	density	kilograms/meter^3	density
sal	salinity	PSU	sal
ISO_DateTime_UTC	Date/Time (UTC) ISO formatted	yyyy-mm-ddTHH:MM:SS[.xx]Z	ISO_DateTime_UTC
cond	conductivity	Siemens/meter	cond

Status message

Database

Contribute Data

Dataset: LB_2012_Mooring_CTD