Lead samples from 1997-2013 were collected using the MITESS (Moored In situ Trace Element Serial Sampler) moored sampler (Bell et al., 2002) (1997-2005) and ATE shipboard sampling from HOT occupations (1997-2012), the HOE-DYLAN cruises (2012), and the HOE-PhoR cruises (2013). Samples from 1997-2000 were analyzed as described by Boyle et al. (2005) and samples after that by the method described by Lee et al. (2011). The 1997-2013 Pb samples were measured as tdPb, that is analysis of an acidified unfiltered seawater sample. Since dissolved Pb (dPb) in pelagic settings is typically >90% of tdPb (Boyle et al., 2005), the tdPb concentrations from the Station ALOHA time-series are directly comparable to the 2015 KM1513 dPb data, i.e. filtered at 0.4 μm.

Data Processing Description

No data processing were necessary.

BCO-DMO Processing Notes:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- re-formatted date from m/d/yy to yyyy-mm-dd
- converted longitude coordinates from degrees West to degrees East.

Data Files

File
hot_pb.csv (Comma Separated Values (.csv), 17.86 KB) MD5:35cc2d17c41e5b3afd2d9829b8c870b9 Primary data file for dataset ID 792783

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Biological Infrastructure	DBI-0424599

Deployments

None available yet

Instruments

Niskin bottle

Supplied Description:

Standard Niskin bottle rosettes were used for thorium sampling.

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.

Trace element sampler

Supplied Name: MIT Automated Trace Element (ATE) sampler

Supplied Description:

The MIT Automated Trace Element (ATE) sampler (Bell et al., 2002) was used for trace metal sampling.

Instrument Type

Generic Name: Trace element sampler

Generic Description:

Automated trace element sampler (MITESS or ATE unit).

Bell, J., J. Betts, and E. Boyle (2002) MITESS: A Moored In-situ Trace Element Serial Sampler for Deep-Sea Moorings, Deep-Sea Research I: 49:2103-2118 (pdf)

More description: http://boyle.mit.edu/~ed/MITESS/MITESShomepage.html

Trace element sampler

Supplied Name: MITESS

Supplied Description:

Lead samples from 1997-2013 were collected using the MITESS (Moored In situ Trace Element Serial Sampler) moored sampler (Bell et al., 2002) (1997-2005).

Instrument Type

Generic Name: Trace element sampler

Generic Description:

Automated trace element sampler (MITESS or ATE unit).

Bell, J., J. Betts, and E. Boyle (2002) MITESS: A Moored In-situ Trace Element Serial Sampler for Deep-Sea Moorings, Deep-Sea Research I: 49:2103-2118 (pdf)

More description: http://boyle.mit.edu/~ed/MITESS/MITESShomepage.html

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Pb_TD_CONC	total dissolvable lead concentration	picomole per kilogram (pmol/kg)	Pb
Expedition	expedition identifier	unitless	no_bcodmo_term
Deployment	deployment identifier	unitless	deploy
ISO_Date	date of sampling events in ISO8601 format	unitless	date
Sample_Date	date of sampling events	unitless	date
Lon	longitude of sampling events	decimal degrees	lon
Lat	latitude of sampling events	decimal degrees	lat
Depth	depth of sampling events	meters (m)	depth

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Dataset: Lead Time Series

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Dataset: Lead Time Series

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