Dataset: [DEPRECATED] GN01 Dissolved Mercury Species

Name: [DEPRECATED] Dissolved mercury measurements from the Western Arctic Ocean, which were sampled as part of the 2015 US GEOTRACES Cruise (GN01; HLY1502)
Published: 2018-06-22
Keywords: oceans

Cite This Dataset

Spatial Extent: N:89.995 E:11.9102 S:60.2579 W:-179.5926

Temporal Extent: 2015-08-03 - 2015-10-08

Project:

Collaborative Research: GEOTRACES Arctic Section: Mercury Speciation and Cycling in the Arctic Ocean (GEOTRACES Arctic Mercury)

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

Program:

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

Principal Investigator:

Carl Lamborg (University of California-Santa Cruz, UCSC)

Co-Principal Investigator:

Chad Hammerschmidt (Wright State University)

Contact:

Alison Agather (Wright State University)

BCO-DMO Data Manager:

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

Version:

Version Date:

2018-06-22

Restricted:

Validated:

Yes

Current State:

Deprecated

[DEPRECATED] Dissolved mercury measurements from the Western Arctic Ocean, which were sampled as part of the 2015 US GEOTRACES Cruise (GN01; HLY1502)

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Description

This dataset includes dissolved mercury measurements from the Western Arctic Ocean, which were sampled as part of the 2015 US GEOTRACES Cruise (GN01; HLY1502). This dataset contains four species of dissolved mercury: total mercury, elemental mercury, monomethylmercury, and dimethylmercury.

Status note (2020-10-28): This dataset has been replaced. Use the following dataset instead: https://www.bco-dmo.org/dataset/827530

Methods & Sampling

Samples were collected according to Cutter and Bruland 2012, utilizing a trace metal clean rosette (GT-C rosette). Samples above 20 m were pumped from a hole drilled in the ice far away from the ship, using clean sampling techniques.

Sample bottles were cleaned according to Hammerschmidt et al. 2012.

Dissolved mercury analyses were performed at sea, with the exception of monomethylmercury. The full methodology may be found in the Hg Cook Book, and more detailed method descriptions can be found in Lamborg et al. 2012, Hammerschmidt and Bowman 2012, Bowman et al. 2015, Bowman et al. 2016.

All dissolved species of mercury were measured with a Tekran Model 2500 CVAFS Mercury Detector. Analysis of total mercury (HgT; Fitzgerald and Gill 1979, Bloom and Fitzgerald 1988, Bloom 1989) has a method detection limit of 0.10 pM, and procedural duplicates varied by 11 ± 5% (n = 17).

Elemental mercury (Hg0) was analyzed according to Fitzgerald and Gill (1979), Bloom and Fitzgerald (1988) and Bloom (1989). The method detection limit was 0.04 pM and procedural duplicates varied by 11 ± 14% (n = 8).

Monomethylmercury (MMHg) was analyzed according to Bowman and Hammerschmdit (2011), Tseng et al. (2004) and Munson et al. (2014). The method detection limit was 0.020 pM, and procedural duplicates averaged 11 ± 8% (n =5).

Dimethylmercury (DMHg) was analyzed according to Bowman and Hammerschmidt (2011), Tseng et al. (2004) and Baya et al. (2013). The method detection limit was 0.012 pM.

Data Processing Description

WOCE Quality Flags:
2 – Ok,
3 – Questionable,
4 – Bad Analysis,
5 – Sample lost,
6 – Mean of replicates,
9 – Sample was not collected for Hg analysis.

"nd" indicates no data.
"bdl" indicates below detection limit.

BCO-DMO Processing:
- separated cruise column into two: cruise_name and cruise_id;
- modified parameter names; applied GEOTRACES names provided by submitter;
- joined the following columns from HLY1502 event log, ODF bottle file, and GT-C bottle file, based on the GEOTRC_SAMPNO: GETORC_EVENTNO, GEOTRC_INSTR, ISO_DATETIME_UTC_START_EVENT, ISO_DATETIME_UTC_END_EVENT, EVENT_LAT, EVENT_LON, BTLNBR, BTLNBR_FLAG_W, BTL_DATE, BTL_TIME, BTL_LAT, BTL_LON, CTDPRS, CTDDEPTH, ODF_CTDPRS, ODF_CTDDEPTH.
- 30-October-2018: removed embargo on dataset.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1434650
NSF Division of Ocean Sciences	OCE-1434653
NSF Division of Ocean Sciences	OCE-1534315

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

Cold Vapor Atomic Fluorescence Spectrophotometer

Supplied Name: Tekran Model 2500 CVAFS Mercury Detector

Supplied Description:

Cold Vapor Atomic Fuorescent Spectrometer (CVAFS) quantitatively measures volatile heavy metals, such as mercury. Gaseous mercury atoms are carried to the detector via inert gas, excited by a UV light source, and radiate the absorbed energy. The fluorescence is detected by either a photomultiplier tube or UV photodiode.

Instrument Type

Generic Name: Cold Vapor Atomic Fluorescence Spectrophotometer

Acronym: CVAFS

Generic Description:

A Cold Vapor Atomic Fluorescent Spectrophotometer (CVAFS) is an instrument used for quantitative determination of volatile heavy metals, such as mercury. CVAFS make use of the characteristic of mercury that allows vapor measurement at room temperature. Mercury atoms in an inert carrier gas are excited by a collimated UV light source at a particular wavelength. As the atoms return to their non-excited state they re-radiate their absorbed energy at the same wavelength. The fluorescence may be detected using a photomultiplier tube or UV photodiode.

GO-FLO Teflon Trace Metal Bottle

Supplied Name: GT-C rosette

Supplied Description:

Instrument Type

Generic Name: GO-FLO Teflon Trace Metal Bottle

Acronym: GO-FLO Teflon TM

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

Generic Description:

GO-FLO Teflon-lined Trace Metal free sampling bottles are used for collecting water samples for trace metal, nutrient and pigment analysis. The GO-FLO sampling bottle is designed specifically to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_name	Cruise identification	unitless	cruise_name
cruise_id	Official cruise ID	unitless	cruise_id
STNNBR	GEOTRACES station number	unitless	station
Latitude	Latitude of sample collection; provided by the data contributor	decimal degrees north	lat
Longitude	Longitude of sample collection; provided by the data contributor	decimal degrees east	lon
GEOTRC_EVENTNO	GEOTRACES event number; joined from event log	unitless	event
GEOTRC_INSTR	Sampling instrument; joined from event log	unitless	instrument
ISO_DATETIME_UTC_START_EVENT	Date and time, formatted to the ISO 8601 standard, at the start of the sampling event, according to the event log. Format: YYYY-MM-DDTHH:MM:SS[.xx]Z	unitless	ISO_DateTime_UTC
ISO_DATETIME_UTC_END_EVENT	Date and time, formatted to the ISO 8601 standard, at the end of the sampling event, according to the event log. Format: YYYY-MM-DDTHH:MM:SS[.xx]Z	unitless	ISO_DateTime_UTC
EVENT_LAT	Latitude at the start of the event; north is positive; joined from event log.	decimal degrees	lat
EVENT_LON	Longitude at the start of the event; east is positive; joined from event log.	decimal degrees	lon
GEOTRC_SAMPNO	GEOTRACES sample number	unitless	sample
BTLNBR	Bottle number; joined from bottle file	unitless	bottle
BTLNBR_FLAG_W	Bottle number quality flag; follows WOCE conventions. 2 = no problems noted; 3 = leaking; 4 = did not trip correctly; 9 = samples not drawn from this bottle.	unitless	flag
Depth	Depth of sample collection; provided by the data contributer	meters (m)	depth
BTL_DATE	Date (year, month, day) when the bottle was fired; according to the bottle file. Format: yyyymmdd	unitless	date
BTL_TIME	Time (hours and minutes) when the bottle was fired; according to the bottle file. Format: HHMM	unitless	time
BTL_LAT	Latitude of bottle firing; north is positive.	decimal degrees	lat
BTL_LON	Lonitude of bottle firing; east is positive.	decimal degrees	lon
Hg_D_CONC_BOTTLE	Total mercury measurement	picomoles per kilogram (pmol/kg)	trace_metal_conc
Hg_D_CONC_BOTTLE_QF	Total mercury quality flag (WOCE)	unitless	q_flag
Hg_0_D_CONC_BOTTLE	Elemental mercury measurement	picomoles per kilogram (pmol/kg)	trace_metal_conc
Hg_0_D_CONC_BOTTLE_QF	Elemental mercury quality flag (WOCE)	unitless	q_flag
Hg_MM_D_CONC_BOTTLE	Monomethylmercury measurement	picomoles per kilogram (pmol/kg)	trace_metal_conc
Hg_MM_D_CONC_BOTTLE_QF	Monomethylmercury quality flag (WOCE)	unitless	q_flag
Hg_DM_D_CONC_BOTTLE	Dimethylmercury measurement	picomoles per kilogram (pmol/kg)	trace_metal_conc
Hg_DM_D_CONC_BOTTLE_QF	Dimethylmercury quality flag (WOCE)	unitless	q_flag
CTDPRS	CTD pressure; joined from bottle file	decibars	press
CTDDEPTH	CTD bottle firing depth; joined from bottle file	meters	depth
ODF_CTDPRS	The ODF software acquisition measurement of pressure; joined from bottle file	decibars	press
ODF_CTDDEPTH	The ODF software acquisition measurement of depth; joined from bottle file	meters	depth

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Dataset: [DEPRECATED] GN01 Dissolved Mercury Species