Dissolved Po-210 and Pb-210 in six vertical profiles from super stations of EPZT of US GEOTRACES cruise on RV Thompson cruise 303. Dissolved Po-210 and Pb-210, dissolved: ≤ 0.45 mm; units: disintegration per minute (dpm) / 100 L of water.

Expand/Collapse All

Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2016-06-13	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.641044.2	2020-03-30

Description

The FISH and BOTTLE data have been split into separate columns as per GEOTRACES Parameter Naming Conventions.The data is the same as version 2016-06-03. The FISH data are to the far right.

Methods & Sampling

The methodology is published in Church et al., (2012) and Baskaran et al. (2013) as well as given in the Sampling and Sample-handling Protocols for GEOTRACES Cruises (Cookbook).

Chemical Procedures for the analysis of dissolved Po-210 and Pb-210 may be downloaded below under 'Supplemental Files'.

We have conducted a large number of blanks to obtain high-quality data. We have also an archived water sample from the Atlantic and assessed the activities of Po-210 and Pb-210 in a known sample. We have developed an Excel Spreadsheet that includes all the corrections (both decay and in-growth) needed to get accurate data.

Data Processing Description

Details of all calculations are in Baskaran et al. (2013).

BCO-DMO Processing:
- added conventional header with dataset name, PI name, version date
- renamed parameters to BCO-DMO standard
- added columns by joining the submitted data with an Events Master file - bottle and fish samples separated; parameter names revised

Additional GEOTRACES Processing:
As was done for the GEOTRACES-NAT data, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters:

cruise_id, EXPOCODE,SECT_ID, STNNBR, CASTNO, GEOTRC_EVENTNO, GEOTRC_SAMPNO, GEOTRC_INSTR, SAMPNO, GF_NO, BTLNBR, BTLNBR_FLAG_W, DATE_START_EVENT, TIME_START_EVENT, ISO_DATETIME_UTC_START_EVENT, EVENT_LAT, EVENT_LON, DEPTH_MIN, DEPTH_MAX, BTL_DATE, BTL_TIME, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, ODF_CTDPRS, SMDEPTH, FMDEPTH, BTMDEPTH, CTDPRS, CTDDEPTH.

This added information will facilitate subsequent analysis and inter comparison of the datasets.

Bottle parameters in the master file were taken from the GT-C_Bottle and ODF_Bottle datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the TN303 Event Log (version 30 Oct 2014). Where applicable, pump information was taken from the PUMP_Nuts_Sals dataset.

A standardized BCO-DMO method (called "join") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.

If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.

See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.

Data Files

File
PoPb_diss_join_fish_btl.csv (Comma Separated Values (.csv), 22.47 KB) MD5:5da6802096f9f813307b03cd07071dc3 Primary data file for dataset ID 641044

Supplemental Files

File
Baskaran GEOTRACES EPZT procedures for dissolved Po filename: Chemical_Procedures_for_the_analysis_of_dissolved_Po_7March2016.pdf (Portable Document Format (.pdf), 394.10 KB) MD5:aaaf25febf80f2f51204be8ad1ce8478 Procedures for dissolved Po used by M. Baskaran for GEOTRACES EPZT data.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1237059

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
TN303	GP16 GEOTRACES EPZT GEOTRACES East Pacific Zonal Transect (EPZT) GT13 325020131025	2013-10-25	R/V Thomas G. Thompson	James W. Moffett (Chief Scientist) Gregory A. Cutter (Co-Chief Scientist) Christopher R. German (Co-Chief Scientist)	data info

Instruments

CTD Sea-Bird SBE 911plus

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird SBE 911plus

Acronym: CTD SBE 911plus

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0058/

Generic Description:

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

GO-FLO Bottle

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: GO-FLO Bottle

Acronym: GO-FLO

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/30/

Generic Description:

GO-FLO bottle cast used to collect water samples for pigment, nutrient, plankton, etc. The GO-FLO sampling bottle is specially designed to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.

Niskin bottle

Supplied Name:

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.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Cruise identification	unitless	cruise_id
STNNBR	Station Number	unitless	station
CASTNO	Cast Number. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	unitless	cast
GEOTRC_EVENTNO	GEOTRACES Event Number. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	unitless	event
SAMPNO	Sample number. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	unitless	bottle
BTLNBR	Bottle number. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	unitless	bottle
BTLNBR_FLAG_W	Bottle quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing data. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	unitless	q_flag
ISO_DATETIME_UTC_START_EVENT	ISO 8601:2004 standard date and time at start of event. Values were added from the intermediate US GEOTRACES master file (see Processing Description). in the format YYYY-MM-DDTHH:MM:SS[.xx]Z	unitless	ISO_DateTime_UTC
BTL_ISO_DATETIME_UTC	ISO 8601:2004 standard date and time of bottle firing. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	yyyy-MM-dd'T'HH:mm:ss.SS'Z'	ISO_DateTime_UTC
BTL_LAT	Latitude of bottle firing; north is positive. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	decimal degrees	lat
BTL_LON	Longitude of bottle firing; east is positive. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	decimal degrees	lon
GEOTRC_SAMPNO	GEOTRACES sample number	unitless	sample
depth_PI	Depth as reported by PI	meters	depth
CTDDEPTH	CTD bottle firing depth. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	meters	depth
vol_sample	Volume of sample	kg	volume
Po_210_D_CONC_BOTTLE	Dissolved Po-210; dissolved: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from CTD bottle sample	210Po dpm 100L-1	trace_metal_conc
Po_210_D_CONC_BOTTLE_sd	Error as standard deviation	210Po dpm 100L-1	trace_metal_sd
Po_210_D_CONC_BOTTLE_flag	WOCE quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing dat	unitless	q_flag
Pb_210_D_CONC_BOTTLE	Dissolved Pb-210; dissolved: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from CTD bottle sample	210Pb dpm 100L-1	trace_metal_conc
Pb_210_D_CONC_BOTTLE_sd	Error as standard deviation	210Pb dpm 100L-1	trace_metal_sd
Pb_210_D_CONC_BOTTLE_flag	WOCE quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing dat	unitless	q_flag
Po_210_Pb_210_D_RATIO_BOTTLE	Ratio of Po-210 to Pb-210	unitless	trace_metal_conc
Po_210_Pb_210_D_RATIO_BOTTLE_sd	Error as standard deviation	unitless	trace_metal_sd
Po_210_D_CONC_FISH	Dissolved Po-210; dissolved: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from GEO-FISH sample	210Po dpm 100L-1	trace_metal_conc
Po_210_D_CONC_FISH_sd	Error as standard deviation	210Po dpm 100L-1	trace_metal_sd
Po_210_D_CONC_FISH_flag	WOCE quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing dat	unitless	q_flag
Pb_210_D_CONC_FISH	Dissolved Pb-210; dissolved: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from GEO-FISH sample	210Pb dpm 100L-1	trace_metal_conc
Pb_210_D_CONC_FISH_sd	Error as standard deviation	210Pb dpm 100L-1	trace_metal_sd
Pb_210_D_CONC_FISH_flag	WOCE quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing dat	unitless	q_flag
Po_210_Pb_210_D_RATIO_FISH	Ratio of Po-210 to Pb-210 from GEO-FISH sample	unitless	trace_metal_conc
Po_210_Pb_210_D_RATIO_FISH_sd	Error as standard deviation	unitless	trace_metal_sd