Enhanced Production of Oceanic Dimethylsulfide Resulting from CO2-Induced Grazing Activity in a High CO2 World

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• 作者：Ja-Myung Kim ; Kitack Lee ; Eun Jin Yang ; Kyoungsoon Shin ; Jae Hoon Noh ; Ki-tae Park ; Bonggil Hyun ; Hae-Jin Jeong ; Ju-Hyoung Kim ; Kwang Young Kim ; Miok Kim ; Hyun-Cheol Kim ; Pung-Guk Jang ; Min-Chul Jang
• 刊名：Environmental Science & Technology
• 出版年：2010
• 出版时间：November 1, 2010
• 年：2010
• 卷：44
• 期：21
• 页码：8140-8143
• 全文大小：211K
• 年卷期：v.44,no.21(November 1, 2010)
• ISSN：1520-5851

文摘

Oceanic dimethylsulfide (DMS) released to the atmosphere affects the Earth’s radiation budget through the production and growth of cloud condensation nuclei over the oceans. However, it is not yet known whether this negative climate feedback mechanism will intensify or weaken in oceans characterized by high CO₂ levels and warm temperatures. To investigate the effects of two emerging environmental threats (ocean acidification and warming) on marine DMS production, we performed a perturbation experiment in a coastal environment. Two sets of CO₂ and temperature conditions (a pCO₂ of 900 ppmv at ambient temperature conditions, and a pCO₂ of 900 ppmv at a temperature 3 °C warmer than ambient) significantly stimulated the grazing rate and the growth rate of heterotrophic dinoflagellates (ubiquitous marine microzooplankton). The increased grazing rate resulted in considerable DMS production. Our results indicate that increased grazing-induced DMS production may occur in high CO₂ oceans in the future.