Toxicity of atmospheric aerosols on marine phytoplankton
Open Access
- 24 March 2009
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 106 (12), 4601-4605
- https://doi.org/10.1073/pnas.0811486106
Abstract
Atmospheric aerosol deposition is an important source of nutrients and trace metals to the open ocean that can enhance ocean productivity and carbon sequestration and thus influence atmospheric carbon dioxide concentrations and climate. Using aerosol samples from different back trajectories in incubation experiments with natural communities, we demonstrate that the response of phytoplankton growth to aerosol additions depends on specific components in aerosols and differs across phytoplankton species. Aerosol additions enhanced growth by releasing nitrogen and phosphorus, but not all aerosols stimulated growth. Toxic effects were observed with some aerosols, where the toxicity affected picoeukaryotes and Synechococcus but not Prochlorococcus. We suggest that the toxicity could be due to high copper concentrations in these aerosols and support this by laboratory copper toxicity tests preformed with Synechococcus cultures. However, it is possible that other elements present in the aerosols or unknown synergistic effects between these elements could have also contributed to the toxic effect. Anthropogenic emissions are increasing atmospheric copper deposition sharply, and based on coupled atmosphere–ocean calculations, we show that this deposition can potentially alter patterns of marine primary production and community structure in high aerosol, low chlorophyll areas, particularly in the Bay of Bengal and downwind of South and East Asia.Keywords
This publication has 36 references indexed in Scilit:
- Sedimentary and mineral dust sources of dissolved iron to the world oceanBiogeosciences (online), 2008
- Impact of anthropogenic atmospheric nitrogen and sulfur deposition on ocean acidification and the inorganic carbon systemProceedings of the National Academy of Sciences of the United States of America, 2007
- AerosolsPublished by Springer Science and Business Media LLC ,2006
- A simulation of the effect of climate change–induced desertification on mineral dust aerosolGeophysical Research Letters, 2005
- An overview of the SeaWiFS project and strategies for producing a climate research quality global ocean bio-optical time seriesDeep Sea Research Part II: Topical Studies in Oceanography, 2004
- A less dusty future?Geophysical Research Letters, 2003
- Iron supply and demand in the upper oceanGlobal Biogeochemical Cycles, 2000
- On the use of dissolved aluminum in surface waters to estimate dust deposition to the oceanGlobal Biogeochemical Cycles, 2000
- Global patterns of marine nitrogen fixation and denitrificationGlobal Biogeochemical Cycles, 1997
- Glacial‐interglacial CO2 change: The Iron HypothesisPaleoceanography and Paleoclimatology, 1990