Dataset: AE1812 in situ Chl a
Deployment: AE1812

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/820948

Lead Principal Investigator:

Tatiana A. Rynearson (University of Rhode Island, URI-GSO)

Co-Principal Investigator:

Bethany D. Jenkins (University of Rhode Island, URI-GSO)

BCO-DMO Data Manager:

Christina Haskins (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: Defining the biogeochemical drivers of diatom physiological ecology in the North Atlantic (North Atlantic Diatoms)

Version:

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Description

Methods & Sampling

Dataset acquisition description

In situ Chlorophyll a was measured at each station along the AE1812 cruise track. A CTD was deployed to collect water from the euphotic zone. Samples were filtered in triplicate onto GF/F and 5µm and 20µm polycarbonate filters.

Chl a was extracted from filters in 100% denatured ethanol for 12 hours, measured on a 10-AU Fluorometer, and chlorophyll a and phaeophytin concentrations were calculated based on a predetermined calibration curve. Concentrations on each filter were used to determine total chl a within each size fraction.

Data Processing Description

Dataset Processing Description

Data was processed in R 3.6.2 (R-Core-Team 2019)

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values in this dataset are displayed as "nd" for "no data." nd is the default missing data identifier in the BCO-DMO system.
* converted datetime into ISO_DateTime_UTC format
* converted latitude and longitude from degrees decimal minutes to decimal degrees
* set types for each data column

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1558490	NSF Division of Ocean Sciences

Instruments

Turner Designs Fluorometer 10-AU

Supplied Name: 10AU Fluorometer (Turner Designs, San Jose, CA)

Supplied Description:

Instrument Type

Generic Name: Turner Designs Fluorometer 10-AU

Acronym: Turner Fluorometer 10-AU

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0393/

Generic Description:

The Turner Designs 10-AU Field Fluorometer is used to measure Chlorophyll fluorescence. The 10AU Fluorometer can be set up for continuous-flow monitoring or discrete sample analyses. A variety of compounds can be measured using application-specific optical filters available from the manufacturer. (read more from Turner Designs, turnerdesigns.com, Sunnyvale, CA, USA)

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
ISO_DateTime_UTC	Date and time of sample collection	YYYY-MM-DDTHH:MM:SS[.xx]Z	ISO_DateTime_UTC
lat_converted	Latitude of sample collection	degrees	lat
lon_converted	Longitude of sample collection	degrees	lon
station	Station of CTD cast	unitless	station
cast	CTD cast number	unitless	cast
niskin_bottle_ID	Bottle ID of niskin used to collect sample	unitless	bot_Nis
depth	depth of sample collection	m	depth
size_fraction	size fraction analyzed based on pore size of filter	m	no_bcodmo_term
tube_ID	ID of the tube	unitless	sample
vol_filtered	Volume of seawater filtered for chl a analysis	ml	vol_filt
vol_extracted	Volume of ethanol used to extract chl a	ml	sample_volume
Fb	Fluorescence before acidification	RFU	fluor
Fa	Fluorescence after acidification	RFU	fluor
blank_subt_Fb	Blank corrected fluorescence before acidification	RFU	instrument_blank
blank_subt_Fa	Blank corrected fluorescence after acidification	RFU	instrument_blank
chla	Chlorophyll a concentration	g/L	chl_a
phaeo	Phaeophytin concentration	g/L	phaeo

Database

Contribute Data

Dataset: AE1812 in situ Chl a
Deployment: AE1812

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: AE1812 in situ Chl aDeployment: AE1812

Dataset acquisition description

Dataset Processing Description

Dataset: AE1812 in situ Chl a
Deployment: AE1812