Dataset: chlorophyll

Name: Extracted chlorophyll data from CTD rosette bottles from R/V Thomas G. Thompson and R/V Kilo Moana cruises TN277, KM1301, KM1312 in the Eastern North Pacific Ocean from 2012-2013 (POWOW project)
Published: 2014-07-16
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.3751.3

Spatial Extent: N:46.6888 E:-118.316 S:21.3911 W:-160.6166

Temporal Extent: 2012-03-01 - 2013-07-27

Project:

Seasonal and decadal changes in temperature drive Prochlorococcus ecotype distribution patterns (POWOW)

Principal Investigator:

Zackary I. Johnson (Duke University)

BCO-DMO Data Manager:

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

Version:

Version Date:

2014-07-16

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Extracted chlorophyll data from CTD rosette bottles from R/V Thomas G. Thompson and R/V Kilo Moana cruises TN277, KM1301, KM1312 in the Eastern North Pacific Ocean from 2012-2013 (POWOW project)

Abstract:

Extracted chlorophyll concentrations from POWOW1 (TN277), POWOW2 (KM1301), and POWOW3 (KM1312) cruises. POWOW1 data include total chlorophyll (>0.22 um), >2 um, and >20 um. POWOW2 and POWOW3 data include total chlorophyll (>0.22 um) and >0.8 um.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2014-07-16	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.3751.3	2019-03-05

Description

Methods & Sampling

Methods described in Johnson et al. 2010:
Chlorophyll concentrations were measured by filtering 100 mL of seawater sample onto a polycarbonate filter (of pore size 0.22 um, 2 um or 20 um on POWOW1; and of pore size 0.22 um or 0.8 um on POWOW2) using gentle vacuum (<100 mm Hg) and extracting in 100% MeOH at -20 degrees C in the dark for >24 h following (Holm-Hansen and Riemann, 1978). Fluorescence was measured using a Turner Designs 10-AU fluorometer following Welschmeyer (1994) that was calibrated against a standard chlorophyll solution (Ritchie, 2006).

Data Processing Description

> 0.22 um referred to as "total" or simply "chlorophyll".

BCO-DMO edits made:
- Parameter names have been changed to conform to BCO-DMO conventions.
- month_utc, day_utc, year, and time_utc were added, based on the original ISO_DateTime_UTC field.
- Rosette bottle numbers were added from the CTD cast sheets.
- Replaced 'NaN' and '-999' with 'nd' to indicate 'no data'.

Data Files

File
chlorophyll.csv (Comma Separated Values (.csv), 129.74 KB) MD5:0cc1f3c76f163979a2761c50852126b4 Primary data file for dataset ID 3751

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1031064

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KM1301	POWOW2	2013-01-10	R/V Kilo Moana	Zackary I. Johnson (Chief Scientist) Erik Zinser (Co-Chief Scientist) Zackary I. Johnson (Contact)	data info
KM1312	POWOW3	2013-07-01	R/V Kilo Moana	Zackary I. Johnson (Chief Scientist) Erik Zinser (Co-Chief Scientist) Zackary I. Johnson (Contact)	data info
TN277	POWOW1	2012-02-29	R/V Thomas G. Thompson	Zackary I. Johnson (Chief Scientist) Erik Zinser (Co-Chief Scientist) Zackary I. Johnson (Contact)	data info

Instruments

Turner Designs Fluorometer 10-AU

Supplied Name: Turner Designs Fluorometer -10-AU

Supplied Description:

Fluorescence was measured using a Turner Designs 10-AU fluorometer following Welschmeyer (1994) that was calibrated against a standard chlorophyll solution (Ritchie, 2006).

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_name	Cruise identifier (POWOW1 = TN277 = R/V Thomas G. Thompson cruise 277; POWOW2 = KM1301 = R/V Kilo Moana cruise 1301).	text	cruise_name
cast	Consecutive CTD cast number. CTD numbers are unique and sequential across stations.	unitless	cast
lat	Latitude at start of CTD cast. Positive = North.	decimal degrees	lat
lon	Longitude at start of CTD cast. Positive = East.	decimal degrees	lon
depth_w	Depth of the water (bottom depth) at sampling station.	meters	depth_w
month_utc	2-digit month of year, UTC.	mm (01 to 12)	month_utc
day_utc	2-digit day of month, UTC.	dd (01 to 31)	day_utc
year	4-digit year. in YYYY format	unitless	year
time_utc	Time (UTC) at start of sample collection, 24-hour clock.	HHMM.mm	time_utc
ISO_DateTime_UTC	Date/Time (UTC) ISO8601 formatted. T indicates start of time string; Z indicates UTC.	YYYY-mm-ddTHH:MM:SS.ssZ	ISO_DateTime_UTC
depth	Sample depth.	meters	depth
bot	Rosette position of the bottle.	unitless	bot
chl_tot	Total chlorophyll concentration, in milligrams Chl-a per cubic meter. Measured using polycarbonate filter with 0.22um pore size.	mg/m^3	chl_a
chl_2um	> 2um chlorophyll concentration, measured in milligrams Chl-a per cubic meter. Measured on POWOW1 cruise only using polycarbonate filter with 2um pore size.	mg/m^3	no_bcodmo_term
chl_20um	> 20um chlorophyll concentration, measured in milligrams Chl-a per cubic meter. Measured on POWOW1 cruise only using polycarbonate filter with 20um pore size.	mg/m^3	chl_a_20u
chl_0d8um	> 0.8 um chlorophyll concentration, measured in milligrams Chl-a per cubic meter. Measured on POWOW2 cruise only using polycarbonate filter with 0.8um pore size.	mg/m^3	no_bcodmo_term

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