Dataset: SECM_nutrients_points
Deployment: jc0018

Nutrients and ctd data, 1997-2006 in Southeastern Alaska

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)

Lead Principal Investigator:

Joseph A Orsi (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)

Data Manager:

Emily A. Fergusson (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)

Project:

U.S. GLOBEC Northeast Pacific (NEP)

Current State:

Final no updates expected

Version:

SECM_dec_2007.mdb from H. Batchelder, {date}

Version Date:

2010-05-24

Data URL:

https://www.bco-dmo.org/dataset-deployment/453284/data

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Description

Note: This dataset is identical to SECM_nutrients_all, however, this version is configured so that the data are mapped as individual points (one per cruise) in the MapServer interface. See SECM_nutrients_all to map the data as a time series by station.

Nutrient data collected in conjunction with juvenile salmon studies in the Gulf of Alaska from 1999-2005 by the Southeast Coastal Monitoring Project. Measurements include settling volume, displacement volume, composition of taxa.

Methods & Sampling

Dataset acquisition description

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.

One shallow vertical haul (20-m) was made at each station (except three at ABM) with a 50-cm, 243-micron mesh NORPAC net.

One deep vertical haul (to 200 m or within 10 m of bottom) was made at ABM and the Icy Point stations with a 57-cm, 202-micron mesh WP-2 net.

One double oblique bongo haul was made at stations along the Icy Strait and Lower Clarence Strait transects and at ABM to a depth of 200 m or within 20 m of the bottom, using a 60-cm diameter tandem frame with 505-micron and 333-micron mesh nets. A VEMCO ML-08-TDR time-depth recorder was used with the oblique bongo hauls to record the maximum sampling depth of each haul. General Oceanics model 2031 or Rigosha flow meters were placed inside the bongo and deep conical nets for calculation of filtered water volumes.

Also see related SECM datasets:
station data
ctd
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

Dataset Processing Description

Surface water samples were taken at each station for later nutrient and chlorophyll analysis contracted to the Marine Chemistry Laboratory at the University of Washington School of Oceanography.

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 souce. 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.

More information about this dataset deployment

Funding

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

Instruments

Niskin bottle

Supplied Name: 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.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
chl_a	chlorophyll	mg/m3	chl_a
day_local	day of month	integer	day_local
depth_ctd	CTD wire out	meters	no_bcodmo_term
depth_nuts	depth that nutrients water sample was taken normally @ surface (0m); 2005 has 20m samples	meters	no_bcodmo_term
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_haul	latitude at start of haul; North is positive; negative denotes South	decimal degrees	lat
lat	latitude for station; North is positive; negative denotes South	decimal degrees	lat
light	light level at surface	watts/meter square	no_bcodmo_term
lon_haul	longitude at start of haul; East is positive; negative denotes West	decimal degrees	lon
lon	longitude at station; East is positive; negative denotes West	decimal degrees	lon
month_local	month of year	1-12	month_local
NH4	ammonium	nd	NH4
NO2	nitrites	nd	NO2
NO3	nitrates	nd	NO3
phaeo	phaeopigment	mg/m3	phaeo
PO4	phosphates	nd	PO4
region	Northern (NSE) or Southern SE Alaska (SSE).	text	region
sal	salinity at 3 m depth	parts per thousand	sal
SiO4	silicate; Si(OH)4	nd	SiO4
station	station code; see table above	text	station
temp	temperature at 3 m depth	degrees Celsius	temp
time_local	time of day; local time; using 2400 clock format	HHmm	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)	jjj.ddd	yrday_local
cruise_id	cruise identification: jc=John Cobb; next two numbers = year; last 2 numbers = cruise # ('x' means cruise # is not known)	text	cruise_id

Database

Contribute Data

Dataset: SECM_nutrients_points
Deployment: jc0018

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: SECM_nutrients_pointsDeployment: jc0018

Dataset acquisition description

Dataset Processing Description

Dataset: SECM_nutrients_points
Deployment: jc0018