Citation:

PANGAEA.952541

Name: The apparent iron solubility calculated from ambient temperature, pH and dissolved organic carbon in the Atlantic and Pacific oceans
Published: 2022-12-19
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Biogeochemical Cycling; Iron Geochemistry; Ocean acidification; ocean warming; trace metals

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Abstract:

Iron (Fe) is an important limiting nutrient in the marine environment constraining primary production across much of the ocean due to its sparse solubility in seawater. Iron availability regulates the magnitude and dynamics of ocean primary productivity, and is dependent on Fe solubility and speciation in seawater which in turn are influenced by physico-chemical properties such as pH, temperature, dissolved organic material. In this study, the apparent iron solubility (SFe(III)app) is calculated in an oversaturated system by setting an input of dissolved Fe(III) to 10 nmol L-1, at ambient ocean pH, temperature and dissolved organic carbon concentrations. This will result in the precipitation of Fe hydroxide, as ferrihydrite assumed in our system. The SFe(III)app is defined as the sum of aqueous inorganic Fe(III) species and Fe(III) bound to DOM, formed at a free Fe (Fe3+) concentration equal to the limiting solubility of Fe hydroxide (Fe(OH)3(s)). We compared calculated apparent iron solubility to measured dissolved iron concentrations (dFe) from three GEOTRACES cruises in the Atlantic and Pacific oceans. I aim to build a comprehensive picture on Fe speciation and dFe inventory in the ambient oceanic water column, with further feedbacks on primary productivity.

Keyword(s):

Biogeochemical Cycling; Iron Geochemistry; Ocean acidification; ocean warming; trace metals

Supplement to:

Zhu, Kechen; Gerringa, Loes J A; Middag, Rob; Hopwood, Mark James; Gledhill, Martha (2023): Influence of Changes in pH and Temperature on the Distribution of Apparent Iron Solubility in the Oceans. Global Biogeochemical Cycles, 37(5), e2022GB007617, https://doi.org/10.1029/2022GB007617

Project(s):

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

Coverage:

Median Latitude: 4.485057 * Median Longitude: -63.866897 * South-bound Latitude: -48.890000 * West-bound Longitude: -152.000000 * North-bound Latitude: 64.000000 * East-bound Longitude: -17.570000

Date/Time Start: 2010-05-02T22:44:43 * Date/Time End: 2013-12-17T04:09:34

Minimum DEPTH, water: 1.4 m * Maximum DEPTH, water: 5804.0 m

Event(s):

GA02_2A * Latitude: 64.000000 * Longitude: -34.250000 * Date/Time: 2010-05-02T22:44:43 * Elevation: -2215.0 m

GA02_2B * Latitude: -48.890000 * Longitude: -48.730000 * Date/Time: 2011-03-06T23:27:33 * Elevation: -5900.0 m

GA02_3 * Latitude: 62.350000 * Longitude: -36.000000 * Date/Time: 2010-05-03T22:27:44 * Elevation: -2708.0 m

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Zhu, Kechen
2	Station label	Station		Zhu, Kechen
3	DEPTH, water	Depth water	m	Zhu, Kechen		Geocode
4	Temperature, water	Temp	°C	Zhu, Kechen	Measured
5	Salinity	Sal		Zhu, Kechen	Measured	practical salinity
6	Alkalinity, total	AT	µmol/kg	Zhu, Kechen	Measured
7	Carbon, inorganic, dissolved	DIC	µmol/kg	Zhu, Kechen	Measured
8	pH	pH		Zhu, Kechen	Measured	total scale
9	pH	pH		Zhu, Kechen	Measured	NBS scale
10	Carbon, organic, dissolved	DOC	µmol/kg	Zhu, Kechen	Measured
11	Iron	Fe	nmol/l	Zhu, Kechen	Modeled	Fe(III) assumed
12	Iron	Fe	nmol/l	Zhu, Kechen	Modeled	SFe(III)app

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

12700 data points

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