Southern Ocean Phytoplankton Stimulated by Wildfire Emissions and Sustained by Iron Recycling

20Citations
Citations of this article
45Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

Large ash plumes emitted by the 2019–2020 Australian wildfires were associated with a widespread phytoplankton bloom in the iron-limited Pacific sector of the Southern Ocean. In this study, we used satellite observations and aerosol reanalysis products to study the regional phytoplankton community response to wildfire emissions. The bloom was stimulated by pyrogenic iron fertilization and coincided with elevated cellular pigment concentrations, increased photochemical efficiency, and apparent community structural shifts. Physiological anomalies were consistent with previously observed phytoplankton responses to iron stress relief and persisted for up to 9 months. Supported by a regional iron budget, we conclude that the bloom was sustained by iron recycling and episodic inputs of pyrogenic and dust-borne mineral iron. The continuous regeneration of iron was likely facilitated by the bloom's large size, mitigating edge dilution effects, as well as enhanced bioavailability of pyrogenic and mineral iron due to atmospheric and chemical processing during long-range transport.

Cite

CITATION STYLE

APA

Weis, J., Schallenberg, C., Chase, Z., Bowie, A. R., Wojtasiewicz, B., Perron, M. M. G., … Strutton, P. G. (2022). Southern Ocean Phytoplankton Stimulated by Wildfire Emissions and Sustained by Iron Recycling. Geophysical Research Letters, 49(11). https://doi.org/10.1029/2021GL097538

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free