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Detailed Reference Information |
Gabric, A.J., Simó, R., Cropp, R.A., Hirst, A.C. and Dachs, J. (2004). Modeling estimates of the global emission of dimethylsulfide under enhanced greenhouse conditions. Global Biogeochemical Cycles 18: doi: 10.1029/2003GB002183. issn: 0886-6236. |
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We have used a marine food-web model, an atmosphere-ocean general circulation model (GCM), and an empirical dimethylsulfide (DMS) algorithm to predict the DMS seawater concentration and the DMS sea-to-air flux in 10¿ latitude bands from 70¿N to 70¿S under contemporary and enhanced greenhouse conditions. The DMS empirical algorithm utilizes the food-web model predictions of surface chlorophyll and the GCM's simulation of oceanic mixed layer depth. The food-web model was first calibrated to contemporary climate conditions using satellite-derived chlorophyll data and meteorological forcings. For the climate change simulations, the meteorological forcings were derived from a transient simulation of the CSIRO Mark 2 GCM, using the IPCC/IS92a radiative forcing scenario to the period of equivalent CO2 tripling (2080). The globally integrated DMS flux perturbation is predicted to be +14%; however, we found strong latitudinal variation in the perturbation. The greatest perturbation to DMS flux is simulated at high latitudes in both hemispheres, with little change predicted in the tropics and sub-tropics. The largest change in annual integrated flux (+106%) is simulated in the Southern Hemisphere between 50¿S and 60¿S. At this latitude, the DMS flux perturbation is most influenced by the GCM-simulated changes in the mixed layer depth. The results indicate that future increases in stratification in the polar oceans will play a critical role in the DMS cycle and climate change. |
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Abstract |
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Keywords
Atmospheric Composition and Structure, Biosphere/atmosphere interactions, Atmospheric Composition and Structure, Air/sea constituent fluxes (3339, 4504), Global Change, Biogeochemical processes, Mathematical Geophysics, Modeling, climate change, dimethylsulfide (DMS), model |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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