Sulfur isotope variability of oceanic DMSP generation and its contributions to marine biogenic sulfur emissions.

Proceedings of the National Academy of Sciences of the United States of America
Harry OduroJames Farquhar

Abstract

Oceanic dimethylsulfoniopropionate (DMSP) is the precursor to dimethylsulfide (DMS), which plays a role in climate regulation through transformation to methanesulfonic acid (MSA) and non-seasalt sulfate (NSS-SO(4)(2-)) aerosols. Here, we report measurements of the abundance and sulfur isotope compositions of DMSP from one phytoplankton species (Prorocentrum minimum) and five intertidal macroalgal species (Ulva lactuca, Ulva linza, Ulvaria obscura, Ulva prolifera, and Polysiphonia hendryi) in marine waters. We show that the sulfur isotope compositions (δ(34)S) of DMSP are depleted in (34)S relative to the source seawater sulfate by ∼1-3‰ and are correlated with the observed intracellular content of methionine, suggesting a link to metabolic pathways of methionine production. We suggest that this variability of δ(34)S is transferred to atmospheric geochemical products of DMSP degradation (DMS, MSA, and NSS-SO(4)(2-)), carrying implications for the interpretation of variability in δ(34)S of MSA and NSS-SO(4)(2-) that links them to changes in growth conditions and populations of DMSP producers rather than to the contributions of DMS and non-DMS sources.

References

Jul 19, 2002·Nature·W SundaS Huntsman
Mar 9, 2006·Chemical Reviews·Ian BarnesNikos Mihalopoulos
Jul 18, 2006·Analytical Chemistry·Astrid A SanusiWing-Wai Tang
Mar 8, 2008·Science·Jennifer L DeBoseGabrielle A Nevitt

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Citations

Oct 30, 2013·Proceedings of the National Academy of Sciences of the United States of America·Alon AmraniRonald P Kiene
Dec 3, 2014·Proceedings of the National Academy of Sciences of the United States of America·Michael A AntonelliJames Farquhar
Nov 12, 2013·Rapid Communications in Mass Spectrometry : RCM·Ward Said-Ahmad, Alon Amrani
Jan 27, 2019·Scientific Reports·Alon AngertAlon Amrani
Nov 18, 2020·Rapid Communications in Mass Spectrometry : RCM·Alexandra A PhillipsAlex L Sessions

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