Gledhill, Martha; Liu, Fengjie; Zhang, Qiong; Browning, Thomas J; Twining, Ben S; Buck, Kristen N; Kwiatkowski, Lester; Bowler, Chris; Achterberg, Eric Pieter (2024): Present day and end of century (2100) iron speciation in the surface ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.966487
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Abstract:
The main component of this data set comprises calculated inorganic iron concentrations (Fe' = sum of iron hydroxide species). Inorganic iron is the most bioavailable chemical form of Fe in the ocean. Concentrations of Fe' were calculated according to two models, which we refer to as the discrete ligand model and the continuous binding site model. The discrete ligand model, which is currently applied to calculate Fe speciation in global biogeochemical models, combines dissolved Fe concentrations, conditional stability constants and ligand concentrations to obtain inorganic iron, whilst the continuous distribution model uses the NICA-Donnan model to obtain Fe'. The data supports the manuscript "Climate change decreases biologically available iron pool in the surface ocean." In this manuscript we use the continuous binding site model to show that surface ocean Fe' is sufficient for Fe-replete phytoplankton. We apply new estimates of Fe' to a simple phytoplankton growth model to show that both Fe' and relative growth rates will decrease under the high-end future climate scenario (SSP5-8.5) in all Fe-limited ocean regions, and will mitigate current projections of increased primary productivity in Fe-limited high latitudes regions such as the Southern Ocean. Overall, we demonstrate that Fe-binding site heterogeneity is critical for iron speciation, and must be considered when predicting the response of marine primary producers to ongoing changes in ocean chemistry.
Supplement to:
Gledhill, Martha (in prep.): Climate change decreases biologically available iron pool in the surface ocean.
Related to:
Zhu, Kechen; Achterberg, Eric Pieter; Bates, Nicolas R; Gerringa, Loes; Middag, Rob; Hopwood, Mark James; Gledhill, Martha (2022): The apparent iron solubility calculated from ambient temperature, pH and dissolved organic carbon in the Atlantic and Pacific oceans. PANGAEA, https://doi.org/10.1594/PANGAEA.952541
Project(s):
Funding:
European Commission (EC), grant/award no. 891418: Marie Curie: Iron speciation in the microenvironment surrounding phytoplankton cells and the consequences for Fe bioavailability
NERC independent research fellowship, grant/award no. NE/V01451X/1: Controls on iron availability to marine phytoplankton
Southern Marine Science and Engineering Guangdong Laboratory, grant/award no. SML2021SP204: Southern Marine Science and Engineering Guangdong Laboratory Independent Research grant
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Description | Description | Gledhill, Martha | |||
| 2 | Binary Object | Binary | Gledhill, Martha | |||
| 3 | Binary Object (File Size) | Binary (Size) | Bytes | Gledhill, Martha |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB)
Size:
10 data points
Data
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| 1 Description | 2 Binary | 3 Binary (Size) [Bytes] |
|---|---|---|
| Iron speciation calculated for surface waters (<100 m) data from GEOTRACES cruises GA02 and GA10 (see geotraces.org for more information on the cruises) | A-GA02_GP16-v2.xlsx | 24.8 kBytes |
| A compilation of dissolved iron and iron speciation values for the surface ocean (mean for upper 100 m) derived from observations of iron in the literature combined with salinity, pH and dissolved organic carbon values that were kriged to a 2 degree grid from observations provided in GLDAPv2.2021 (Lauvset, S. K. et al. GLODAPv2.2022: the latest version of the global interior ocean biogeochemical data product. Earth System Science Data 14, 5543-5572 (2022)) and a dataset of dissolved organic carbon (Hansell, D. A. et al. Compilation of dissolved organic matter (DOM) data obtained from global ocean observations from 1994 to 2020 (NCEI Accession 0227166). (2021)) | B-Global_Fe_speciation_surface_waters.xlsx | 571.8 kBytes |
| Iron speciation values matched to observations of Fe quotas (in laboratory and field), growth parameters (laboratory) and the abundance of transcripts for the iron stress ISIP protein. | C-Iron_Quotas_half_sat_constant_isip_abundance-v2.xlsx | 179.6 kBytes |
| Global distribution of iron speciation obtained by kriging values in B to a 2 degree grid, together with limiting nutrient and nutrient limited growth rates predicted with simple Monod type growth kinetics. | D-Global_kriged_surface_ocean_values-v2.xlsx | 3.1 MBytes |
| Multi-model mean for iron speciation, obtained from Earth system CMIP6 SSP5-8.5 scenario in surface waters (3m) in the years 2015 and 2100. Predicted limiting nutrient and nutrient limited growth rates. | E-ESM_Multi_model_means-v2.xlsx | 6 MBytes |