Dataset: Chlorophyll

Name: Chlorophyll a and pheopigment concentrations from R/V New Horizon cruise NH1008 in Monterey Bay, near MBARI buoy M1 (36.747?N, 122.022?W); 2010 (GATEKEEPERS project)
Published: 2012-09-20
Keywords: oceans

Cite This Dataset

Spatial Extent: N:37.029 E:-122.016167 S:36.4375 W:-123.453667

Project:

Zooplankton feeding at the base of the particle maximum: Gatekeepers of the Vertical Flux? (GATEKEEPERS)

Principal Investigator:

David M. Checkley (University of California-San Diego Scripps, UCSD-SIO)

Co-Principal Investigator:

Michael Dagg (Louisiana Universities Marine Consortium, LUMCON)

George A. Jackson (Texas A&M University, TAMU)

Contact:

David M. Checkley (University of California-San Diego Scripps, UCSD-SIO)

BCO-DMO Data Manager:

Stephen R. Gegg (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

20 September 20120

Version Date:

2012-09-20

Validated:

Current State:

Final no updates expected

Chlorophyll a and pheopigment concentrations from R/V New Horizon cruise NH1008 in Monterey Bay, near MBARI buoy M1 (36.747?N, 122.022?W); 2010 (GATEKEEPERS project)

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Description

Chlorophyll a and Pheopigment Concentrations

Methods & Sampling

Chlorophyll a concentration was determined in two size classes: > 20 um and 0.7 – 20 um.
Each water sample was filtered with a cascade filtration system fitted with a 20 mm polycarbonate
filter, and a GF/F glass-fiber filter. Filters were placed in 90% acetone for 24 h at 20 oC and
the extract was measured with a Turner Designs fluorometer before and after acidification to
determine chlorophyll a and pheopigment concentrations (Strickland and Parsons, 1972).

Strickland, J.D.H., Parsons, T.R., 1972. A practical handbook of seawater analysis, second ed., vol. 167. Fisheries Research Board of Canada, Ottawa, Canada, pp. 21–26.

Data Processing Description

Strickland, J.D.H., Parsons, T.R., 1972. A practical handbook of seawater analysis, second ed., vol. 167. Fisheries Research Board of Canada, Ottawa, Canada, pp. 21–26.

BCO-DMO Processing/Edits
- Generated from original file "Gatekeeper_chlorophyll.xls" contributed by Jessica Forrest-Baldini
- CTD Date, Time, Lat, Lon inserted from CTD station data (CTD headers)
- Parameter names modified to conform to BCO-DMO conventions (blanks to underscores, etc.)
- "nd" (no data) inserted in black cells

Data Files

File
Chlorophyll.csv (Comma Separated Values (.csv), 78.45 KB) MD5:5debaeb1c6edca0329dc3aef6368cf1b Primary data file for dataset ID 3724

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0927863
NSF Division of Ocean Sciences	OCE-0928139
NSF Division of Ocean Sciences	OCE-0928425

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
NH1008	GATEKEEPERS	2010-07-08	R/V New Horizon	David M. Checkley (Chief Scientist)	data info

Instruments

CTD Sea-Bird SBE 911plus

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird SBE 911plus

Acronym: CTD SBE 911plus

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0058/

Generic Description:

The Sea-Bird SBE 911 plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911 plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 plus and SBE 11 plus is called a SBE 911 plus. The SBE 9 plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 plus and SBE 4). The SBE 9 plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics

Fluorometer

Supplied Description:

Turner Designs

Instrument Type

Generic Name: Fluorometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/113/

Generic Description:

A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.

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

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

Supplied Name	Supplied description	Supplied Units	Standard Name
CTD_Cast	CTD Cast Number/Id	Dimensionless	cast
ISO_DateTime_UTC	CTD Date/Time from Header File (UTC) ISO formatted	YYYY-MM-DDTHH:MM:SS.xxZ	ISO_DateTime_UTC
Date	CTD Date from Header File (UTC)	YYYYMMDD	date
Time	CTD Time from Header File (UTC)	HHMMSS	time
Latitude	CTD Latitude from Header File (South is negative)	decimal degrees	lat
Longitude	CTD Longitude from Header File (West is negative)	decimal degrees	lon
depth	Sample Depth	meters	depth
vol_filt	Volume filtered	mL	vol_filt
filter	Filter pore size	microns	filter_size
fo	Fluorometer reading before acidification (millivolts)	millivolts	fluor_mV
fa	Fluorometer reading after acidification (millivolts)	millivolts	fluor_mV
chl	Chlorophyll a concentration	micrograms/L	chl_a
phaeo	Phaeopigment concentration	micrograms/L	phaeo
comments	Sample comments	text	activity_and_comments

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Dataset: Chlorophyll