Dataset: NAB08 C-14 PP

Name: Primary productivity measurements from on-deck bottle incubations during R/V Knorr cruise KN193-03 and R/V Bjarni Saemundsson cruises B10-2008 and B4-2008 to the subpolar North Atlantic, Iceland Basin in 2008
Published: 2018-09-17
License: https://creativecommons.org/licenses/by/4.0/
Keywords: oceans

Cite This Dataset

Spatial Extent: N:61.877 E:-20.17983 S:58.835 W:-27.59144

Temporal Extent: 2008-04-03 - 2008-06-29

Project:

North Atlantic Bloom Experiment 2008 (NAB 2008)

Principal Investigator:

Dr Mary Jane Perry (University of Maine)

Contact:

Dr Nathan Briggs (National Oceanography Centre, NOC)

BCO-DMO Data Manager:

Amber York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version Date:

2018-09-17

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Data URL:

https://www.bco-dmo.org/dataset/746215/data

Primary productivity measurements from on-deck bottle incubations during R/V Knorr cruise KN193-03 and R/V Bjarni Saemundsson cruises B10-2008 and B4-2008 to the subpolar North Atlantic, Iceland Basin in 2008

Abstract:

Bottle samples were collected during R/V Knorr cruise KN193-03 and R/V Bjarni Saemundsson cruises B10-2008 and B4-2008 to the subpolar North Atlantic, Iceland Basin in 2008. Primary productivity and photosynthetically active radiation (PAR) measurements were generated from on-deck C-14 bottle incubations. Chlorophyll a measurements were generated from a fluorometric analysis of acetone extract.

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Description

These primary productivity data were published in Briggs et al., 2018.

Results papers for related research utilizing data from the NAB08 project Seaglider, CTD, biofloat, and bottle data are listed in the "Related Publications" section.

Acquisition Description

CTD data are reported as cast number and not as station number.

CTD Rosette system profiled at 0.5 m s-1 between the surface and 200 m, and at 1 m s-1 below 200 m.

Bottles were fired on the upcasts, 60 s after the CTD stopped. Sensor data are averages of a 30-s stationary period immediately before the bottle was fired.

Data Processing:

Fluorometric chlorophyll a (chl_a_fluor):
Water samples for fluorometric analysis of chlorophyll and pheopigments were filtered through Whatman GF/F filters. Triplicate water samples were collected at 10 m. Filters were extracted in 5 ml of 90% acetone at -20 C for 24 h and read on a Turner Designs Model 10-AU Digital fluorometer. The fluorometer was calibrated before and after the field program with Turner Designs chlorophyll standards. Chlorophyll was determined following JGOFS protocol procedures (Knap et al., 1996). For additional details on laboratory analysis of discrete water samples see Supplimental Document: Laboratory_analysis_report-NAB08.pdf.

C-14 primary productivity incubations (PP_C14 vs. PAR experiments):
Samples were collected a depth near to the Chl a maximum, as determined by in situ fluorometery. Each sample was subdivided into 14 50 ml transparent glass bottles and inoculated with known activity of H14CO3- ( i.e. ~ 2 µ Ci pr. bottle ). Subsamples were incubated in duplicate at 7 different PAR levels between 0-400 µmol m-2 s-1 in a temperature regulated incubator. Light was provided using a daylight simulating fluorescent tube panel and its intensity was adjusted using neutral, perforated metal screens. After 2 hours of incubation the content of each sub sample was filtered on Whatman GF/F glass fibre filter and the filter dried for storage until counting of the C-14 activity in a scintillation counter after finishing the series of cruises. Prior to counting of the activity, the filters were fumed in concentrated HCl in a desiccator for 5 minutes, and the scintillation readings were finally adjusted according to an established quenching correction curve for the sample treatment and instrument.

Processing Description

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
* lat lon values rounded from 13 decimal places to 5
* Added ISO timestamp (UTC) from date time columns

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0628107
NSF Division of Ocean Sciences	OCE-0628379
National Aeronautics & Space Administration	NNX08AL92G

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
B10-2008	B2008_10	2008-06-25	R/V Bjarni Saemundsson	Dr Mary Jane Perry (Chief Scientist) Dr Kristinn Gudmunsson (Scientist) Dr Ivona Cetinic (Contact) Mr Keith Van Thiel (Technician)	data info
B4-2008	B2008_04	2008-04-01	R/V Bjarni Saemundsson	Dr Craig Lee (Chief Scientist) Dr Mary Jane Perry (Co-Chief Scientist) Dr Kristinn Gudmunsson (Scientist) Dr Heddin Valdimarsson (Scientist) Eric Rehm (Student) Dr Ivona Cetinic (Contact) Mr Adam Huxtable (Technician) Mr Michael Ohmart (Technician) Ms Maura Thomas (Technician)	data info
KN193-03	NAB08 Process Cruise	2008-05-01	R/V Knorr	Dr Mary Jane Perry (Chief Scientist) Dr Ivona Cetinic (Contact)	data info

Instruments

CTD profiler

(more info)

Short Name: CTD

Community Standard Description

Generic Description

The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column and permits scientists observe the physical properties in real time via a conducting cable connecting the CTD to a deck unit and computer on the ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast. This instrument designation is used when specific make and model are not known.

PI supplied instrument name:

Dataset-specific description

Turner Designs Fluorometer -10-AU

(more info)

Short Name: Turner Fluorometer -10AU

Community Standard Description

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)

PI supplied instrument name: Turner Designs Model 10-AU Digital fluorometer

Dataset-specific description

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise_ID	Cruise identifier	unitless	cruise_id
cast	CTD cast number (not station number)	integer	cast
date	Date (UTC) in format yyyymmdd	unitless	date
time	Time (UTC) in format HHMM	unitless	time
yrday	Time when sample was taken. Elapsed time in units of days since year 0 (Matlab "datenum")	days	yrday
latitude	Latitude	decimal degrees (DD)	lat
longitude	Longitude	decimal degrees (DD)	lon
depth	Sampling depth	meters (m)	depth
chl_a_fluor	Chlorophyll a. Fluorometric analysis of acetone extract	milligrams per meters cubed (mg m^-3)	chl_a
PAR	Photosynthetically active radiation (PAR) from incubation experiment	photon micromoles per meters squared per second (µmol photon m^-2 s^-1)	PAR
PP_14C	14C primary productivity from incubation experiment	milligrams of carbon per meters cubed per hour (mg C m^-3 h^-1)	PP
ISO_DateTime_UTC	Timestamp (UTC) in standard ISO 8601:2004(E) format YYYY-mm-ddTHH:MMZ	unitless	ISO_DateTime_UTC

Supplemental Documents

Name	File Type	Size
Laboratory analysis report for NAB08 Laboratory analysis report for North Atlantic Bloom Experiment 2008 (NAB08) projects. Detailed procedure regarding the discrete measurements of nutrients, Winkler dissolved oxygen, absorption coefficients, particulate organic carbon, fluorometric and HPLC pigment analysis.	Portable Document Format (PDF)	1.96 MB

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Dataset: NAB08 C-14 PP