Enhanced solubility and ecological impact of atmospheric phosphorus deposition upon extended seawater exposure

Environmental Science & Technology
Katherine R M MackeyAdina Paytan

Abstract

Atmospheric P solubility affects the amount of P available for phytoplankton in the surface ocean, yet our understanding of the timing and extent of atmospheric P solubility is based on short-term leaching experiments where conditions may differ substantially from the surface ocean. We conducted longer- term dissolution experiments of atmospheric aerosols in filtered seawater, and found up to 9-fold greater dissolution of P after 72 h compared to instantaneous leaching. Samples rich in anthropogenic materials released dissolved inorganic P (DIP) faster than mineral dust. To gauge the effect of biota on the fate of atmospheric P, we conducted field incubations with aerosol samples collected in the Sargasso Sea and Red Sea. In the Sargasso Sea phytoplankton were not P limited, and biological activity enhanced DIP release from aerosols, and aerosols induced biological mineralization of dissolved organic P in seawater, leading to DIP accumulation. However, in the Red Sea where phytoplankton were colimited by P and N, soluble P was rapidly consumed by phytoplankton following aerosol enrichment. Our results suggest that atmospheric P dissolution could continue over multiple days once reaching the surface ocean, and that previous esti...Continue Reading

References

Jan 1, 1979·Annual Review of Biochemistry·L E Mortenson, R N Thorneley
Dec 17, 2004·Nature·Sergio A Sañudo-WilhelmyDavid A Hutchins
Mar 11, 2009·Proceedings of the National Academy of Sciences of the United States of America·Adina PaytanAnton F Post
Feb 22, 2012·Frontiers in Microbiology·Katherine R M MackeyAdina Paytan

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Citations

Feb 6, 2015·Frontiers in Microbiology·Katherine R M MackeyAdina Paytan
Jul 7, 2018·Nature Communications·Natalie M MahowaldYan Zhang
Jul 24, 2020·Journal of Geophysical Research. Atmospheres : JGR·Armin SorooshianPaquita Zuidema
Feb 6, 2021·FEMS Microbiology Ecology·Nimrod KrupnikEyal Rahav
Feb 10, 2018·Environmental Science & Technology·Zhuojun ZhangMengqiang Zhu

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