Enhanced production of oceanic dimethylsulfide resulting from CO₂-induced grazing activity in a high CO₂ world.
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.
Kim
Ja-Myung
JM
School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea.
Lee
Kitack
K
Yang
Eun Jin
EJ
Shin
Kyoungsoon
K
Noh
Jae Hoon
JH
Park
Ki-Tae
KT
Hyun
Bonggil
B
Jeong
Hae-Jin
HJ
Kim
Ju-Hyoung
JH
Kim
Kwang Young
KY
Kim
Miok
M
Kim
Hyun-Cheol
HC
Jang
Pung-Guk
PG
Jang
Min-Chul
MC
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*
D000393:Air Pollutants; D013440:Sulfides; D002245:Carbon Dioxide; C004784:dimethyl sulfide