Phytoplanktonic response to simulated volcanic and desert dust deposition events in the South Indian and Southern Oceans

Type Article
Date 2022-07
Language English
Author(s) Geisen CarlaORCID1, Ridame CélineORCID1, Journet EmilieORCID2, Delmelle PierreORCID3, Marie DominiqueORCID4, Lo Monaco ClaireORCID1, Metzl NicolasORCID1, Ammar Rawaa2, 3, Kombo Joelle1, Cardinal DamienORCID1
Affiliation(s) 1 : Sorbonne Université, LOCEAN—IPSL Laboratoire d'Océanographie et du Climat, Expérimentations et Approches Numériques UMR 7159, (SU CNRS MNHN IRD) Paris, France
2 : LISA (Laboratoire Interuniversitaire des Systèmes Atmosphériques), UMR 7583, CNRS Université Paris‐Est Créteil et Université de Paris, Institut Pierre Simon Laplace (IPSL) Créteil ,France
3 : Earth and Life Institute, Environmental Sciences UCLouvain Louvain‐la‐Neuve, Belgium
4 : CNRS Sorbonne Université, UMR 7144 Adaptation et Diversité en Milieu Marin Roscoff ,France
Source Limnology And Oceanography (0024-3590) (Wiley), 2022-07 , Vol. 67 , N. 7 , P. 1537-1553
DOI 10.1002/lno.12100
WOS© Times Cited 1

Contrasting concentrations of macronutrients and micronutrients induce different nutrient limitations of the oceanic productivity and shape the composition of the phytoplankton communities of the South Indian Ocean and Indian sector of the Southern Ocean. o assess the phytoplankton response to nutrient release by desert dust and volcanic ash aerosols in these distinct biogeochemical regions, we conducted microcosm incubation experiments. A dry or wet deposition of either dust from Patagonia or ash from the Icelandic volcano Eyjafjallajökull or dissolved nutrients (Si, Fe, N and/or P) were added to trace metal clean incubations of surface seawater collected from five stations. These deposition experiments enabled the measurement of the biological response along with solubility calculations of nutrients. Both types of aerosols alleviated the iron deficiency occurring in the Southern Ocean during austral summer and resulted in a 24–110% enhancement of the primary production, depending on the station. The release of dissolved silicon may also have contributed to this response, although to a lesser extent, whereas neither the dust nor the ash relieved the nitrogen limitation in the low-nutrient and low-chlorophyll area. Diatom growth was responsible for 40% to 100% of the algal biomass increase within the responding stations, depending on the region and aerosol type. The high particle concentrations that are characteristic of ash deposition following volcanic eruptions may be of equal or higher importance to phytoplankton compared to desert dust, despite ashes' lower nutrient solubility to the ocean.

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Geisen Carla, Ridame Céline, Journet Emilie, Delmelle Pierre, Marie Dominique, Lo Monaco Claire, Metzl Nicolas, Ammar Rawaa, Kombo Joelle, Cardinal Damien (2022). Phytoplanktonic response to simulated volcanic and desert dust deposition events in the South Indian and Southern Oceans. Limnology And Oceanography, 67(7), 1537-1553. Publisher's official version : , Open Access version :