Dataset: Chlorophyll-a

Name: Size-fractionated chlorophyll-a data from samples collected during R/V Savannah cruises conducted in the South Atlantic Bight off the coast of Georgia from 2015-2017
Published: 2020-06-19
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.816278.1

Spatial Extent: N:31.42113 E:-76.343633 S:31.031829 W:-81.121513

Temporal Extent: 2015-03-16 - 2017-01-27

Project:

RUI: Vitamin B12 and nitrogen regulation of oceanic dimethylsulfoniopropionate and dimethylsulfide (B12 Impacts on DMSP)

Principal Investigator:

Peter Lee (College of Charleston - Hollings Marine Lab, CoC-HML)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2020-06-19

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Size-fractionated chlorophyll-a data from samples collected during R/V Savannah cruises conducted in the South Atlantic Bight off the coast of Georgia from 2015-2017

Abstract:

Size-fractionated chlorophyll-a data collected during several R/V Savannah cruises conducted from 2015 to 2017 along a transect from shelf waters to oligotrophic waters in the South Atlantic Bight off the coast of Georgia (Navy Op Area NA06).

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2020-06-19	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.816278.1	2020-06-23

Description

Methods & Sampling

All samples were pre-screened through a 202 µm Nitex mesh. Size-fractionated Chlorophyll a (Chl-a) samples were collected by passing discrete 1 L aliquots of seawater through Nitex with mesh sizes of 63 and 20 µm, and collecting the filtrate. The filtrate was then filtered under low vacuum through GF/F (Sterlitech) filters. An additional sample was directly filtered onto a GF/F filter for total Chl-a. The filters were extracted in 90% acetone overnight at -20°C and analyzed according to the protocol described by Welschmeyer (1994). The size classes were calculated by difference (total, > 63 µm, 63-20 µm, < 20 µm). nd = no data

Data Processing Description

BCO-DMO Processing:
- renamed fields;
- added date/time field in ISO8601 format.

Data Files

File
Chla.csv (Comma Separated Values (.csv), 70.61 KB) MD5:5f828f37cf5aa4664b36d9cbf0885250 Primary data file for dataset ID 816278

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1436458

Deployments

Deployment	Start Date	Platform	Investigator
SAV-15-04	2015-03-15	R/V Savannah	Peter Lee (Chief Scientist)	data info
SAV-15-16	2015-06-20	R/V Savannah	Peter Lee (Chief Scientist)	data info
SAV-15-20	2015-08-07	R/V Savannah	Peter Lee (Chief Scientist)	data info
SAV-15-26	2015-10-13	R/V Savannah	Peter Lee (Chief Scientist)	data info
SAV-16-06	2016-03-06	R/V Savannah	Peter Lee (Chief Scientist)	data info
SAV-16-22	2016-06-21	R/V Savannah	Peter Lee (Chief Scientist)	data info
SAV-16-28	2016-08-15	R/V Savannah	Peter Lee (Chief Scientist)	data info
SAV-17-02	2017-01-21	R/V Savannah	Peter Lee (Chief Scientist)	data info

Instruments

CTD Sea-Bird 911

Supplied Name: Sea-Bird Scientific SBE 911 CTD carousel

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird 911

Acronym: CTD SBE 911

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0035/

Generic Description:

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

Sea-Bird SBE 25 Sealogger CTD

Supplied Name: SBE-25 CTD

Supplied Description:

Instrument Type

Generic Name: Sea-Bird SBE 25 Sealogger CTD

Acronym: CTD SBE 25

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0040/

Generic Description:

The Sea-Bird SBE 25 SEALOGGER CTD is battery powered and is typically used to record data in memory, eliminating the need for a large vessel, electrical sea cable, and on-board computer. All SBE 25s can also operate in real-time, transmitting data via an opto-isolated RS-232 serial port. Temperature and conductivity are measured by the SBE 3F Temperature sensor and SBE 4 Conductivity sensor (same as those used on the premium SBE 9plus CTD). The SBE 25 also includes the SBE 5P (plastic) or 5T (titanium) Submersible Pump and TC Duct. The pump-controlled, TC-ducted flow configuration significantly reduces salinity spiking caused by ship heave, and in calm waters allows slower descent rates for improved resolution of water column features. Pressure is measured by the modular SBE 29 Temperature Compensated Strain-Gauge Pressure sensor (available in eight depth ranges to suit the operating depth requirement). The SBE 25's modular design makes it easy to configure in the field for a wide range of auxiliary sensors, including optional dissolved oxygen (SBE 43), pH (SBE 18 or SBE 27), fluorescence, transmissivity, PAR, and optical backscatter sensors. More information from Sea-Bird Electronics: http:www.seabird.com.

Turner Designs Fluorometer 10-AU

Supplied Name: Turner Designs 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
Cruise_ID	Cruise Identifier	unitless	cruise_id
Station_ID	Station number	unitless	station
UTC_Date	Start date for sample collection; Coordinated Universal Time; Format: MM/DD/YYYY	unitless	date
UTC_Time	Start time for sample collection; Coordinated Universal Time; Format: hh:mm:ss	unitless	time
ISO_DateTime_UTC	Start date and time of sample collection formatted to ISO8601 standard: YYYY-MM-DDThh:mm:ssZ	unitless	ISO_DateTime_UTC
Latitude	Start latitude for sample collection; Negative = South	decimal degrees North	lat
Longitude	Start longitude for sample collection; Negative = West	decimal degrees East	lon
Bottom_Depth	Bottom depth from ship's sonar	meters (m)	depth_w
Depth	Sample depth from CTD readout	meters (m)	depth
Total_Chl_a	Total chlorophyll-a concentration	micrograms per liter (ug/L)	chl_a_tot
gt_63_um	Chlorophyll-a concentration in plankton greater than 63 micrometers	micrograms per liter (ug/L)	chl_a_fluor
bw_63_20_um	Chlorophyll-a concentration in plankton in size range 20-63 micrometers	micrograms per liter (ug/L)	chl_a_fluor
lt_20_um	Chlorophyll-a concentration in plankton smaller than 20 micrometers	micrograms per liter (ug/L)	chl_a_fluor

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Dataset: Chlorophyll-a

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Dataset: Chlorophyll-a

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