Dataset: AR16 in situ Chl a

Name: Chlorophyll a concentrations along the cruise track of AR16 from May 2017 in the Sargasso Sea
Published: 2019-08-21
Keywords: oceans

View Data: Data not available yet

Cite This Dataset

Spatial Extent: N:40.366 E:-64.3812 S:29.0625 W:-71.2761

Temporal Extent: 2017-05-04 - 2017-05-20

Project:

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

Principal Investigator:

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

Co-Principal Investigator:

Sonya T. Dyhrman (Columbia University)

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

BCO-DMO Data Manager:

Mathew Biddle (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2019-08-21

Restricted:

Validated:

Current State:

Data not available

Chlorophyll a concentrations along the cruise track of AR16 from May 2017 in the Sargasso Sea

Expand/Collapse All

Description

Chlorophyll a concentrations along the cruise track of AR16.

Methods & Sampling

In situ Chlorophyll a was measured at each station along the AR16 cruise track. A CTD was deployed to collect water from the deep chlorophyll maximum and filtered in triplicate onto GF/F and 5µm polycarbonate filters.

Chl a was extracted from filters in 100% 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

Data was processed in R 3.4.1 (R-Core-Team 2017).

BCO-DMO Processing Notes:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- removed greater than symbol (>) from size_fraction field.
- reformatted date from mm/dd/yy HH:MM to yyyy-mm-ddTHH:MM:SS to conform with the ISO 8601 convention
- converted the latitude and longitude fields from degrees decimal minutes to decimal degrees.

More Information about this dataset

Funding Sources

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

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
AR16	PHAT – Phosphorus, Hydrocarbons, and Trichodesmium	2017-05-03	R/V Neil Armstrong	Benjamin A.S. Van Mooy (Chief Scientist)	data info

Instruments

Turner Designs Fluorometer 10-AU

Supplied Name: 10AU Fluorometer

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

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

Supplied Name	Supplied description	Supplied Units	Standard Name
blank_subt_Fa	Blank corrected fluorescence after acidification	RFU	fluor
blank_subt_Fb	Blank corrected fluorescence before acidification	RFU	fluor
cast	CTD cast number	unitless	cast
chla	Chlorophyll a concentration	micrograms per liter (ug/L)	chl_a
datetime	Date and time of incubation conclusion in UTC following ISO 8601 format	unitless	ISO_DateTime_UTC
depth	depth of sample collection	meters (m)	depth
Fa	Fluroescence after acidification	RFU	fluor
Fb	Fluorescence before acidification	RFU	fluor
latitude	Latitude of sample collection	decimal degrees	lat
longitude	Longitude of sample collection	decimal degrees	lon
Notes	Notes regarding sample	unitless	comment
phaeo	Phaeophytin concentration	micrograms per liter (ug/L)	phaeo
size_fraction	greater than size fraction analyzed based on pore size of filter	micrometers (um)	no_bcodmo_term
station	Station of CTD cast	unitless	sta
tube_no	tube number	unitless	tube_num
vol_extracted	Volume of ethanol used to extract chla a	milliliters (ml)	volume
vol_filtered	Volume of seawater filtered for chl a analysis	milliliters (ml)	vol_filt

Status message

Database

Contribute Data

Dataset: AR16 in situ Chl a