title: Enhanced production of oceanic dimethylsulfide resulting from CO₂-induced grazing activity in a high CO₂ world.
abstract: 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 CO(2) 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 CO(2) and temperature conditions (a pCO(2) of ∼900 ppmv at ambient temperature conditions, and a pCO(2) 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 CO(2) oceans in the future.
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea.
authors.forename: Ja-Myung
authors.initials: JM
authors.lastname: Kim
authors.forename: Kitack
authors.initials: K
authors.lastname: Lee
authors.forename: Eun Jin
authors.initials: EJ
authors.lastname: Yang
authors.forename: Kyoungsoon
authors.initials: K
authors.lastname: Shin
authors.forename: Jae Hoon
authors.initials: JH
authors.lastname: Noh
authors.forename: Ki-Tae
authors.initials: KT
authors.lastname: Park
authors.forename: Bonggil
authors.initials: B
authors.lastname: Hyun
authors.forename: Hae-Jin
authors.initials: HJ
authors.lastname: Jeong
authors.forename: Ju-Hyoung
authors.initials: JH
authors.lastname: Kim
authors.forename: Kwang Young
authors.initials: KY
authors.lastname: Kim
authors.forename: Miok
authors.initials: M
authors.lastname: Kim
authors.forename: Hyun-Cheol
authors.initials: HC
authors.lastname: Kim
authors.forename: Pung-Guk
authors.initials: PG
authors.lastname: Jang
authors.forename: Min-Chul
authors.initials: MC
authors.lastname: Jang
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000378:metabolism*; D002245:Carbon Dioxide / Q000032:analysis / Q000378:metabolism*; D017377:Diatoms / Q000254:growth & development / Q000378:metabolism; D004141:Dinoflagellida / Q000254:growth & development / Q000378:metabolism; D017752:Greenhouse Effect; D006863:Hydrogen-Ion Concentration; D009792:Oceans and Seas; D012623:Seawater / Q000737:chemistry*; D013440:Sulfides / Q000032:analysis / Q000378:metabolism*
chemical_list: D000393:Air Pollutants; D013440:Sulfides; D002245:Carbon Dioxide; C004784:dimethyl sulfide