Carbon Dioxide and Acetone Air−Sea Fluxes over the Southern Atlantic

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• 作者：Stefano Taddei ; Piero Toscano ; Beniamino Gioli ; Alessandro Matese ; Franco Miglietta ; Francesco P. Vaccari ; Alessandro Zaldei ; Thomas Custer ; Jonathan Williams
• 刊名：Environmental Science & Technology
• 出版年：2009
• 出版时间：July 15, 2009
• 年：2009
• 卷：43
• 期：14
• 页码：5218-5222
• 全文大小：169K
• 年卷期：v.43,no.14(July 15, 2009)
• ISSN：1520-5851

文摘

Measurements of CO₂ and acetone fluxes have been made over a large-scale, naturally occurring high latitude phytoplankton bloom in the remote South Atlantic. Shipborne micrometeorological methods for direct atmospheric flux measurement have been applied to determine the direction and size of the CO₂ and acetone fluxes. Previous results suggest that high latitude oligotrophic ocean regions are sinks of acetone, whereas high productivity regions are sources. The observed CO₂ fluxes are into the ocean and on the order of 1 μmol m⁻² s⁻¹ at most. The acetone fluxes measured show a significant relationship with chlorophyll in the region of the phytoplankton bloom. Although the uncertainty is very high due to the very low signal-to-noise ratio, significant, positive acetone mean fluxes of the order of 0.01 nmol m⁻² s⁻¹ have been observed in bloom areas, whereas near zero, negative, or highly variable low acetone fluxes have been measured elsewhere. Based on these results we estimate that the global acetone source from bloom affected areas is small in comparison to the uptake from the much larger oligotrophic regions, and that the ocean is globally a net sink for acetone.