Citation:

PANGAEA.956224

Name: Seawater analysis from cruise KH-14-6 in the western South Pacific Ocean along the GEOTRACES transect GP19
Published: 2023-03-08
License: https://creativecommons.org/licenses/by/4.0/
Keywords: dCd concentration; dCu concentration; dFe concentration; dNi concentration; dZn concentration; GEOTRACES; labile particulate Fe concentration; scavenging; supply from the Fiji basins; the western South Pacific Ocean

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Published: 2023-03-08 • DOI registered: 2024-05-31

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Abstract:

This data contains the basic hydrological parameters, including temperature, salinity, potential density anomaly, potential temperature, dissolved oxygen, silicate, nitrate, phosphate, and chlorophyll-a concentrations, dissolved (d) Cd, dNi, dZn, dCu, dFe and labile particulate (lp) Fe concentrations in the western South Pacific Ocean along the GEOTRACES transect GP19 (~170°W, 64°S - equator).

Seawater samples were collected using a clean CTD (Conductivity, Temperature, and Depth) sampling system with Niskin-X bottles during the Japanese GEOTRACES cruise KH-14-6 onboard the research vessel Hakuho Maru from December 2, 2014 to February 26, 2015. Filtered samples for the determination of dissolved trace metals (dMs) were passed through an AcroPak cartridge filter with a 0.8/0.2 µm pore size (Pall Life Sciences) and were transferred to 250-mL low-density polyethylene (LDPE) bottles (Nalgene). Samples for the determination of total dissolvable trace metals (tdMs) were not filtered. The seawater samples were acidified to pH ~2 with ultrapure HCl (Tamapure AA-10, Tama Chemicals) immediately after collection and were stored at room temperature in the laboratory for several years until analysis. An offline automated solid-phase extraction system (SPE-100, Hiranuma Sangyo) equipped with a column of Nobias Chelate-PA1 resin (Hitachi High-Technologies) was used to preconcentrate the trace metals (Al, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb) in seawater (Minami et al., 2015; doi:10.1016/j.aca.2014.11.016). Unfiltered samples were first passed through a 0.45-µm pore size Millex syringe filter (Merck Millipore) and then introduced into the SPE-100 system. The labile particulate metal (lpMs) concentrations were calculated as the difference between tdMs and dMs.

Trace metal concentrations were determined using a high-resolution inductively coupled plasma mass spectrometer (HR-ICP-MS, Element 2, Thermo Fisher Scientific) using the calibration curve method. Temperature was measured using a CTD sensor. Salinity was determined using a bench salinometer that was standardized based on the IAPSO standard seawater, and the oxygen content was measured using the Winkler method. Nutrient concentrations were determined by spectrophotometry using an automated analyzer onboard the vessel. Chlorophyll a (Chl. a) was collected on a 25-mm Whatman GF/F glass fiber filter and measured by fluorometry. Samples were collected using a clean CTD (Conductivity, Temperature, and Depth) sampling system with Niskin-X bottles (Sohrin and Bruland, 2011). Filtered samples for dMs determination were passed through an AcroPak cartridge filter with a 0.8/0.2-µm pore size (Pall Life Sciences) by the pressure of compressed air and were transferred to 250-mL low-density polyethylene (LDPE) bottles (Nalgene). Samples for tdMs determination were not filtered and were transferred from Niskin-X bottles to 250-mL LDPE bottles using a silicon tube. Filtered and unfiltered samples were placed in a cleanroom (Class 100) and acidified with 20% HCl (Tamapure AA-10, Tama Chemicals, Japan) to a pH of 1.9–2.0 within 24 h of sample collection.

Keyword(s):

dCd concentration; dCu concentration; dFe concentration; dNi concentration; dZn concentration; GEOTRACES; labile particulate Fe concentration; scavenging; supply from the Fiji basins; the western South Pacific Ocean

Supplement to:

Zheng, Linjie; Minami, Tomoharu; Takano, Shotaro; Sohrin, Yoshiki (2024): Distributions of cadmium, nickel, zinc, copper, and iron in the western South Pacific Ocean: Local sources of the nutrient-type trace metals. Marine Chemistry, 104411, https://doi.org/10.1016/j.marchem.2024.104411

Project(s):

Global marine biogeochemical cycles of trace elements and their isotopes (GEOTRACES)

JSPS KAKENHI (KAKENHI)

Coverage:

Median Latitude: -29.915889 * Median Longitude: -172.976444 * South-bound Latitude: -64.001000 * West-bound Longitude: 172.497000 * North-bound Latitude: 0.003000 * East-bound Longitude: -169.000000

Date/Time Start: 2014-12-15T12:00:00 * Date/Time End: 2015-02-06T00:00:20

Minimum DEPTH, water: 0 m * Maximum DEPTH, water: 5650 m

Event(s):

KH-14-6_GR04_B * Latitude: -5.000000 * Longitude: 172.497000 * Date/Time: 2014-12-15T12:00:00 * Elevation: -4320.0 m * Location: South Pacific Ocean * Method/Device:

KH-14-6_GR05_B * Latitude: -16.987000 * Longitude: 173.917000 * Date/Time: 2014-12-17T12:00:00 * Elevation: -1974.0 m * Location: South Pacific Ocean * Method/Device:

KH-14-6_GR06_B * Latitude: -30.003000 * Longitude: 174.003000 * Date/Time: 2014-12-20T12:00:00 * Elevation: -3281.0 m * Location: South Pacific Ocean * Method/Device:

Comment:

# in oxygen, nutrients, salinity and temperature = quality/questionable values

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Zheng, Linjie
2	Date/Time of event	Date/Time		Zheng, Linjie
3	Latitude of event	Latitude		Zheng, Linjie
4	Longitude of event	Longitude		Zheng, Linjie
5	Elevation of event	Elevation	m	Zheng, Linjie
6	Cruise/expedition	Expedition		Zheng, Linjie
7	Station label	Station		Zheng, Linjie
8	Type	Type		Zheng, Linjie
9	DEPTH, water	Depth water	m	Zheng, Linjie	CTD	Geocode
10	Temperature, water	Temp	°C	Zheng, Linjie	CTD
11	Salinity	Sal		Zheng, Linjie	Salinometer (SALINO)
12	Density, potential anomaly	Dens pot anomaly	kg/m³	Zheng, Linjie
13	Temperature, water, potential	Tpot	°C	Zheng, Linjie
14	Oxygen	O2	µmol/kg	Zheng, Linjie	Titration, Winkler
15	Silicon	Si	µmol/kg	Zheng, Linjie	Spectrophotometer (SPEC)
16	Nitrate	[NO3]-	µmol/kg	Zheng, Linjie	Spectrophotometer (SPEC)
17	Nitrite	[NO2]-	µmol/kg	Zheng, Linjie	Spectrophotometer (SPEC)
18	Phosphate	[PO4]3-	µmol/kg	Zheng, Linjie	Spectrophotometer (SPEC)
19	Chlorophyll a	Chl a	µg/kg	Zheng, Linjie	GF/F WHA1825047, Whatman, UK
20	pH	pH		Zheng, Linjie	CTD
21	Alkalinity, total	AT	µmol/kg	Zheng, Linjie	CTD
22	Iron, dissolved, total	Fe diss tot	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	td (tdMs): total dissolvable (td) trace metals, measured from unfiltered seawater samples.
23	Iron, dissolved	Fe diss	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	d (dMs): dissolved (d) trace metals, measured from filtered seawater samples.
24	Iron, labile particulate	Fe lab part	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	lp (lpMs): labile particulate (lp) trace metals, calculated as the difference between tdMs and dMs.
25	Nickel, dissolved, total	Ni diss tot	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	td (tdMs): total dissolvable (td) trace metals, measured from unfiltered seawater samples.
26	Nickel, dissolved	Ni diss	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	d (dMs): dissolved (d) trace metals, measured from filtered seawater samples.
27	Copper, dissolved, total	Cu diss tot	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	td (tdMs): total dissolvable (td) trace metals, measured from unfiltered seawater samples.
28	Copper, dissolved	Cu diss	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	d (dMs): dissolved (d) trace metals, measured from filtered seawater samples.
29	Copper, labile particulate	Cu lab part	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	lp (lpMs): labile particulate (lp) trace metals, calculated as the difference between tdMs and dMs.
30	Zinc, dissolved, total	Zn diss tot	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	td (tdMs): total dissolvable (td) trace metals, measured from unfiltered seawater samples.
31	Zinc, dissolved	Zn diss	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	d (dMs): dissolved (d) trace metals, measured from filtered seawater samples.
32	Zinc, labile particulate	Zn lab part	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	lp (lpMs): labile particulate (lp) trace metals, calculated as the difference between tdMs and dMs.
33	Cadmium, dissolved, total	Cd diss tot	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	td (tdMs): total dissolvable (td) trace metals, measured from unfiltered seawater samples.
34	Cadmium, dissolved	Cd diss	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	d (dMs): dissolved (d) trace metals, measured from filtered seawater samples.
35	Cadmium, labile particulate	Cd lab part	nmol/kg	Zheng, Linjie	HR-ICP-MS, Thermo Finnigan Element 2	lp (lpMs): labile particulate (lp) trace metals, calculated as the difference between tdMs and dMs.

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

9572 data points

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