Dataset: SECM_CTD_all

Name: Time series of CTD data from SECM stations from R/V John N. Cobb SECM in the Gulf of Alaska from 1997-2006 (NEP project)
Published: 2010-02-23
Keywords: oceans

Cite This Dataset

Spatial Extent: N:58.8934 E:-131.0158 S:55.1052 W:-137.7252

Project:

U.S. GLOBEC Northeast Pacific (NEP)

Program:

U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)

Co-Chief Scientist:

Emily A. Fergusson (National Oceanic and Atmospheric Administration - Alaska Fisheries Science Center, NOAA-AFSC-Auke)

Joseph A Orsi (National Oceanic and Atmospheric Administration - Alaska Fisheries Science Center, NOAA-AFSC-Auke)

Molly V. Sturdevant (National Oceanic and Atmospheric Administration - Alaska Fisheries Science Center, NOAA-AFSC-Auke)

Alex C. Wertheimer (National Oceanic and Atmospheric Administration - Alaska Fisheries Science Center, NOAA-AFSC-Auke)

BCO-DMO Data Manager:

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

Version:

2010-02-23

Version Date:

2010-02-23

Validated:

Yes

Current State:

Final no updates expected

Time series of CTD data from SECM stations from R/V John N. Cobb SECM in the Gulf of Alaska from 1997-2006 (NEP project)

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Description

Note: This dataset is identical to SECM_CTD_points, however, this version is configured so that the data can be plotted as a time series in the MapServer interface (data for individual cruises cannot be mapped). To map the data by cruise number, see SECM_CTD_points.

This coastal monitoring study in the northern region of southeastern Alaska, known as the Southeast Coastal Monitoring Project (SECM), was initiated in 1997 and repeated from 1998 to 2006 (Orsi et al. 1997, 1998, 2000, 2001, 2002) to develop our understanding of the relationships between annual time series of biophysical data and stock-specific information.

CTD data was collected in conjunction with juvenile salmon studies in the Gulf of Alaska from 1997-2006 by the Southeast Coastal Monitoring Project.

Methods & Sampling

The CTD data were collected with a Sea-Bird1 SBE 19 Seacat profiler to 200 m or within 10 m of the bottom. Surface (3-m) temperature and salinity data were collected at 1-minute intervals with an onboard thermosalinograph (Sea-Bird SBE 21).

Surface (bucket) and 20-m (Niskin bottle) water samples were taken once at each station for later nutrient and chlorophyll analysis.

To quantify ambient light levels, light intensities (W * m-2) were recorded at each station with a Li-Cor Model 189 radiometer.

To quantify relative water clarity, the CTD was used in lieu of a Secchi disk; depth measurements (m) were made by observing the visual disappearance of the CTD following deployment.

Also see related SECM datasets:
station data
nutrients
zooplankton
fish catch data
fish length and stomach contents

Station Codes:

station	locality
ABM	Auke Bay Monitor
CS A-D	Cross Sound
ED A-D	Cape Edward
FPR	False Point Retreat
IP A-D	Icy Point
IS A-D	Icy Strait
LC A-D	Lower Clarence
LFC	Lower Favorite Channel
MC A-D	Middle Clarence
TK G-I	Taku Inlet transect
UC A-D	Upper Chatham Strait

Data Processing Description

Use constraints: User must read and fully comprehend the metadata prior to use. User must acknowledge the Originator when using the data set as a source. User must share data products developed using the source data set with the Originator. Data should not be used beyond the limits of the source scale.

Data Files

File
secm_ctd.csv (Comma Separated Values (.csv), 111.26 KB) MD5:7b78186e3286a041f46a7aa86a0652d8 Primary data file for dataset ID 3741

More Information about this dataset

Funding Sources

Funding Source	Award Number
National Oceanic and Atmospheric Administration	unknown NEP NOAA
National Science Foundation	unknown NEP NSF

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
SECM		1997-05-20	R/V John N. Cobb	Alex C. Wertheimer (Chief Scientist)	data info

Instruments

CTD Sea-Bird SEACAT 19

Supplied Description:

The CTD data were collected with a Sea-Bird1 SBE 19 Seacat profiler to 200 m or within 10 m of the bottom.

Instrument Type

Generic Name: CTD Sea-Bird SEACAT 19

Acronym: CTD SBE 19

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0042/

Generic Description:

The Sea-Bird SBE 19 SEACAT Recorder measures conductivity, temperature, and pressure (depth). The SEACAT is self-powered and self-contained and can be deployed in profiling or moored mode. The SBE 19 SEACAT was replaced in 2001 by the 19plus. more information from Sea-Bird Electronics

Niskin bottle

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.

Radiometer

Supplied Description:

To quantify ambient light levels, light intensities (W* m-2) were recorded at each station with a Li-Cor Model 189 radiometer.

Instrument Type

Generic Name: Radiometer

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

Generic Description:

Radiometer is a generic term for a range of instruments used to measure electromagnetic radiation (radiance and irradiance) in the atmosphere or the water column. For example, this instrument category includes free-fall spectral radiometer (SPMR/SMSR System, Satlantic, Inc), profiling or deck cosine PAR units (PUV-500 and 510, Biospherical Instruments, Inc). This is a generic term used when specific type, make and model were not specified.

Thermosalinograph

Supplied Description:

Surface (3-m) temperature and salinity data were collected at 1-minute intervals with an onboard thermosalinograph (Sea-Bird SBE 21).

Instrument Type

Generic Name: Thermosalinograph

Acronym: TSG

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/133/

Generic Description:

A thermosalinograph (TSG) is used to obtain a continuous record of sea surface temperature and salinity. On many research vessels the TSG is integrated into the ship's underway seawater sampling system and reported with the underway or alongtrack data.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
depth_ctd	CTD wire out	meters	depth_cast
depth_secchi	depth that CTD disappears	meters	no_bcodmo_term
depth_w	water depth	meters	depth_w
haul_id	haul number	integer	haul_id
lat	latitude of station, North is positive	in decimal degrees	lat
light	light level at surface	watts/meter square	no_bcodmo_term
lon	longitude of station. West is negative.	in decimal degrees	lon
month_local	month of year	1-12	month_local
region	Northern vs Southern SE Alaska (NSE and SSE)	text	region
sal	salinity at 3 m depth	parts per thousand	sal
station	Station code. See Acquisition Description (above).	see table above	station
temp	temperature at 3 m depth	degrees Celsius	temp
time_local	time of day	local time	time_local
year	year of sampling	YYYY	year
yrday_local	local day and decimal time, as 326.5 for the 326th day of the year, or November 22 at 1200 hours (noon)	day of year (local)	yrday_local
day_local	day of month, local time	1-31	day_local
lat_haul	latitude at start of haul; North is positive	decimal degrees	lat
lon_haul	longitude at start of haul; West is negative.	decimal degrees	lon
cruise_id	cruise identification: jc=John Cobb; next two numbers = year; last 2 numbers = cruise # ('x' means cruise # is not known)	text	cruise_id

Status message

Database

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Dataset: SECM_CTD_all