Dataset: GN01 Dissolved Actinium-227

Name: Water column profiles of dissolved Actinium-227 (227Ac) from the U.S. GEOTRACES Arctic cruise (HLY1502; GN01) on USCGC Healy from August to October 2015
Published: 2020-10-02
Keywords: oceans

View Data: Data not available yet

Cite This Dataset

Spatial Extent: N:89.989 E:174.817 S:60.224 W:-180

Temporal Extent: 2015-08-12 - 2015-10-08

Project:

GEOTRACES Arctic Section: Actinium-227 as a Naturally-occurring Tracer of Dissolved Material Transport in the Arctic Ocean (GT Arctic 227Ac)

U.S. Arctic GEOTRACES Study (GN01) (U.S. GEOTRACES Arctic)

Program:

U.S. GEOTRACES (U.S. GEOTRACES)

Principal Investigator:

Douglas E. Hammond (University of Southern California, USC)

BCO-DMO Data Manager:

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

Version:

Version Date:

2020-10-02

Restricted:

Validated:

Current State:

Data not available

Water column profiles of dissolved Actinium-227 (227Ac) from the U.S. GEOTRACES Arctic cruise (HLY1502; GN01) on USCGC Healy from August to October 2015

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Methods & Sampling

In summary: Filtered water from McLane submersible pumps was passed through acetate filter cartridges impregnated with MnO2. Ac, along with Ra and Th, were sorbed to the cartridges. These were returned to USC and analyzed.

See Methodology Supplemental File (BCO-DMO_227Ac_Methods_for_Arctic_Geotraces_GN01.pdf) for details.

Problem report: Some pump deployments failed to deliver sufficient water (nd).

Data Processing Description

BCO-DMO Processing:
- renamed fields to conform with BCO-DMO parameter naming conventions.

Supplemental Files

File
227Ac Methods for Arctic GEOTRACES filename: BCO-DMO_227Ac_Methods_for_Arctic_Geotraces_GN01.pdf (Portable Document Format (.pdf), 497.75 KB) MD5:62e89f7d29f57e5d7d339eee9d9f2b1e Detailed methods for Arctic GEOTRACES 227Ac dataset contributed by PI D. Hammond.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1436958

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
HLY1502	GN01 U.S. GEOTRACES Arctic 32H120150809	2015-08-09	USCGC Healy	David C. Kadko (Chief Scientist) William M. Landing (Co-Chief Scientist)	data info

Instruments

McLane Pump

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: McLane Pump

Generic Description:

McLane pumps sample large volumes of seawater at depth. They are attached to a wire and lowered to different depths in the ocean. As the water is pumped through the filter, particles suspended in the ocean are collected on the filters. The pumps are then retrieved and the contents of the filters are analyzed in a lab.

Radium Delayed Coincidence Counter

Supplied Name: RaDeCC

Supplied Description:

RaDeCC manufactured by Scientific Computing, Inc (Columbia, SC)

Instrument Type

Generic Name: Radium Delayed Coincidence Counter

Acronym: RaDeCC

Generic Description:

The RaDeCC is an alpha scintillation counter that distinguishes decay events of short-lived radium daughter products based on their contrasting half-lives. This system was pioneered by Giffin et al. (1963) and adapted for radium measurements by Moore and Arnold (1996).

References:
Giffin, C., A. Kaufman, W.S. Broecker (1963). Delayed coincidence counter for the assay of actinon and thoron. J. Geophys. Res., 68, pp. 1749-1757.
Moore, W.S., R. Arnold (1996). Measurement of 223Ra and 224Ra in coastal waters using a delayed coincidence counter. J. Geophys. Res., 101 (1996), pp. 1321-1329.
Charette, Matthew A.; Dulaiova, Henrieta; Gonneea, Meagan E.; Henderson, Paul B.; Moore, Willard S.; Scholten, Jan C.; Pham, M. K. (2012). GEOTRACES radium isotopes interlaboratory comparison experiment. Limnology and Oceanography - Methods, vol 10, pg 451.

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
GEOTRC_CASTNO	Cast number	unitless	cast
GEOTRC_INSTR	Instrument	unitless	instrument
Station_ID	Station number	unitless	station
Start_Date_UTC	Start date; format: MM/DD/YYYY	unitless	date
Start_Time_UTC	Start time; format: hh:mm	unitless	time
Start_ISO_DateTime_UTC	Start date and time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
End_Date_UTC	End date; format: MM/DD/YYYY	unitless	date
End_Time_UTC	End time; format: hh:mm	unitless	time
End_ISO_DateTime_UTC	End date and time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
Start_Latitude	Start latitude	degrees North	lat
Start_Longitude	Start longitude	degrees East	lon
End_Latitude	End latitude	degrees North	lat
End_Longitude	End longitude	degrees East	lon
Event_ID	Event number	unitless	event
Sample_ID	GEOTRACES sample number	unitless	sample
Sample_Depth	Sample depth	meters (m)	depth
Vol_Flag	Volume flag: 1=320-1500L; 2=200-320L; 3=<200L.	unitless	flag
Ac227	Actinium-227	disintegrations per minute per cubic meter (dpm/m3)	Ac227
sig_ex227Ac	?	disintegrations per minute per cubic meter (dpm/m3)	Ac227
Ac_Flag	Ac Flag = Calc method: 1=a; 2=b; 3=c; 4=d.	unitless	q_flag
Excess_227Ac	Excess Actinium-227	disintegrations per minute per cubic meter (dpm/m3)	Ac227
sig_ex227Ac_2	?	disintegrations per minute per cubic meter (dpm/m3)	Ac227
Excess_Ac_Flag	Excess Ac Flag: 1=Use meas Pa; 2=estimated Pa.	unitless	q_flag

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Database

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Dataset: GN01 Dissolved Actinium-227