Dataset: GP15 Hg Underway Leg 2

Name: Dissolved elemental mercury (Hg) from samples collected by the ship’s underway system during Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018
Published: 2020-12-02
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.832415.1

Spatial Extent: N:18.252 E:-151.794 S:-15 W:-153.738

Temporal Extent: 2018-10-26 - 2018-11-18

Project:

US GEOTRACES Pacific Meridional Transect (GP15) (U.S. GEOTRACES PMT)

US GEOTRACES Pacific Meridional Transect: Determination of the air-sea exchange of inorganic and methylated mercury in the anthropogenically-impacted and remote Pacific Ocean (PMT Mercury air-sea exchange)

Program:

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

Principal Investigator:

Robert P. Mason (University of Connecticut, UConn)

BCO-DMO Data Manager:

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

Version:

Version Date:

2020-12-02

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Dissolved elemental mercury (Hg) from samples collected by the ship’s underway system during Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018

Abstract:

Dissolved elemental mercury (Hg) concentrations from water samples collected by the ship’s underway system during Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2020-12-02	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.832415.1	2021-01-07

Methods & Sampling

This dataset reports dissolved elemental mercury (Hg) concentration measured continuously while the ship is moving, but not while on station, with samples taken from the ship's underway sampling system.

Samples are collected with 10 minute integration and the data submitted is the average concentration and standard deviation for each day while the ship is moving. The water is supplied by the ship's underway sampling system and the analytical methods rely on the equilibration of Hg-free air bubbled through the water, which is collected and analyzed using an automated Tekran 2357X air sampling system. The water concentration is calculated based on the air concentration assuming equilibrium and using Henry's Law (Mason et al., 2017; DiMento et al., 2019). The automated analyzer that detects the elemental Hg is automatically calibrated with an in situ permeation tube but was also calibrated manually each week during the cruise with a manual injection.

This parameter, because of the nature of its collection, was not assigned GEOTRACES sample numbers. The sampling depth is that of the ship's inlet system, which varies somewhat but is around 5 m on average so these are surface water samples.

Dissolved elemental Hg is reported in units of fmol/L
Detection limit = 0.4
Spike recovery (%) = 98.2±4.3

Data Processing Description

BCO-DMO Processing:
- added date-time fields in ISO8601 format;
- applied GEOTRACES DOoR barcoded names;
- renamed fields to conform with BCO-DMO naming conventions.

Data Files

File
Hg_Underway_Leg2.csv (Comma Separated Values (.csv), 3.04 KB) MD5:8eb9a0fd462bc11e0f47bc21be23691c Primary data file for dataset ID 832415

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1736659

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR1815	GP15 GP15 Leg 2 33RR20180918 PMT US GEOTRACES PMT	2018-10-24	R/V Roger Revelle	Gregory A. Cutter (Chief Scientist) Karen L. Casciotti (Co-Chief Scientist) Phoebe J. Lam (Co-Chief Scientist)	data info

Instruments

Pump - Surface Underway Ship Intake

Supplied Name: underway sampling system

Supplied Description:

Instrument Type

Generic Name: Pump - Surface Underway Ship Intake

Acronym: Pump-Ship Intake

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/31/

Generic Description:

The 'Pump-underway ship intake' system indicates that samples are from the ship's clean water intake pump. This is essentially a surface water sample from a source of uncontaminated near-surface (commonly 3 to 7 m) seawater that can be pumped continuously to shipboard laboratories on research vessels. There is typically a temperature sensor near the intake (known as the hull temperature) to provide measurements that are as close as possible to the ambient water temperature. The flow from the supply is typically directed through continuously logged sensors such as a thermosalinograph and a fluorometer. Water samples are often collected from the underway supply that may also be referred to as the non-toxic supply. Ideally the data contributor has specified the depth in the ship's hull at which the pump is mounted.

Tekran 2537X Automated Ambient Air Analyzer

Supplied Name: Tekran 2357X air sampling system

Supplied Description:

Instrument Type

Generic Name: Tekran 2537X Automated Ambient Air Analyzer

Acronym: Tekran 2537X

Generic Description:

The Tekran 2537X performs continuous long-term, unattended analysis of gaseous elemental mercury.

More information from the manufacturer:
https://www.tekran.com/products/ambient-air/tekran-model-2537-cvafs-automated-mercury-analyzer/

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Station_ID	Station number	unitless	station
Start_Date_UTC	Date (UTC) at start of sample collection; format: DD/MM/YYYY Format: %d/%m/%Y	unitless	date
Start_Time_UTC	Time (UTC) at start of sample collection; format: hh:mm Format: %H:%M	unitless	time
Start_ISO_DateTime_UTC	Date and time (UTC) at start of sample collection; formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
End_Date_UTC	Date (UTC) at end of sample collection; format: DD/MM/YYYY Format: %d/%m/%Y	unitless	date
End_Time_UTC	Time (UTC) at end of sample collection; format: hh:mm Format: %H:%M	unitless	time
End_ISO_DateTime_UTC	Date and time (UTC) at end of sample collection; formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Start_Latitude	Latitude at start of sample collection	unitless	lat
Start_Longitude	Longitude at start of sample collection	unitless	lon
End_Latitude	Latitude at end of sample collection	unitless	lat
End_Longitude	Longitude at end of sample collection	unitless	lon
Event_ID	Event number	unitless	event
Sample_ID	GEOTRACES sample number	unitless	sample
Sample_Depth	Sample depth	meters (m)	depth
Hg_0_D_CONC_UWAY_yp1oss	Dissolved elemental mercury (Hg) concentration measured continuously with samples taken from the ship's underway sampling system	femtomoles per liter (fmol/L)	Hg0
SD1_Hg_0_D_CONC_UWAY_yp1oss	One standard deviation of Hg_0_D_CONC_UWAY_yp1oss	femtomoles per liter (fmol/L)	Hg0
Flag_Hg_0_D_CONC_UWAY_yp1oss	Quality flag for Hg_0_D_CONC_UWAY_yp1oss	unitless	q_flag

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Dataset: GP15 Hg Underway Leg 2