A proposed seasonal cycle of dissolved iron-binding ligands in Antarctic sea ice
Bibliographic Data
| ID | 19569016 |
|---|---|
| Authors | Cristina Genovese (0000-0001-9282-1030, University of Tasmania), Marco Grotti (0000-0001-6956-5761, University of Genoa), Francisco Ardini (0000-0003-0094-9227, University of Genoa), Matthew J Corkill, Matthew Corkill (0000-0002-5847-3738, University of Tasmania), Luis Duprat (0000-0003-1536-9559, University of Tasmania), Luis P Duprat, Kathrin Wuttig (0000-0003-4010-5918, University of Tasmania), Ashley T Townsend (0000-0002-2972-2678, University of Tasmania), Delphine Lannuzel (0000-0001-6154-1837, University of Tasmania) |
| Year | 2023 |
| Volume | 10 |
| Issue | 1 |
| Publication date | 2023-03-17 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Elementa Science of the Anthropocene (JOURNAL) |
| Journal identifiers | ISSN: 2325-1026 • E-ISSN: 2325-1026 |
| Publisher | University of California Press (PUBLISHER • US) |
| DOI | 10.1525/elementa.2021.00030 |
| OpenAlex | W4327786212 |
| Language | EN |
| References cited | 83 |
Iron (Fe) is an essential micronutrient to oceanic microalgae, and its dissolved fraction (DFe) is retained in surface waters by Fe-binding ligands. Previous work has suggested that ligands may also bind Fe within sea ice, although supporting data are limited. This study investigates distribution, concentration, and potential drivers of Fe-binding ligands in Antarctic sea ice, considering the ice type, location and season. Results suggest that the concentration of ligands (CL) varies throughout the year, both spatially and seasonally. The lowest CL (3.3–8.0 nM) and DFe concentrations (0.7–3.5 nM) were recorded in newly formed winter sea ice in the Weddell Sea, likely due to the early stage of sea-ice growth and low biological activity. The highest CL (1.7–74.6 nM), which follows the distribution of DFe (1.0–75.5 nM), was observed during springtime, in the Eastern Antarctic Sector. There, consistently higher values for CL in bottom ice depths were likely associated with enhanced algal biomass, while aeolian deposition may have acted as an additional source of DFe and ligands near Davis station. In summer, the senescence of ice algae and advanced sea-ice melting led to intermediate CL (1.0–21.9 nM) and DFe concentrations (0.6–13.3 nM) both on and off the East Antarctic coast. Regardless of time and location, >99% of DFe was complexed, suggesting that CL controls the distribution of DFe in sea ice. This study represents a first attempt at a year-round investigation of CL in sea ice, providing results that support the premise that sea ice acts as a potential biogeochemical bridge between autumn and spring phytoplankton blooms
Sea ice · Arctic and Antarctic ice dynamics · Chemistry · Environmental Science · Marine and coastal ecosystems · Ocean Acidification Effects and Responses · Environmental Chemistry · Geology · Oceanography
| Citation velocity | historical |
|---|---|
| Highly cited | No |