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Enhanced marine sulphur emissions offset global warming and impact rainfall
B S Grandey1, C Wang1,2
1Center for Environmental Sensing and Modeling, Singapore-MIT Alliance for Research and Technology, Singapore.
Scientific Reports
|August 22, 2015
Summary
Ocean fertilization could cool the planet by increasing dimethyl sulfide (DMS) emissions, offsetting greenhouse gas warming. However, this geoengineering approach may negatively impact rainfall patterns and water resources.
Area of Science:
- Climate Science
- Geoengineering
- Oceanography
Background:
- Ocean fertilization is a proposed geoengineering technique to remove atmospheric carbon dioxide.
- Increased marine productivity from fertilization may elevate dimethyl sulfide (DMS) emissions.
- DMS is a key precursor to sulfate aerosols, influencing climate through direct and indirect aerosol effects.
Purpose of the Study:
- To investigate the transient climate impacts of enhanced ocean DMS emissions.
- To evaluate the potential of DMS-induced cooling as a solar radiation management (SRM) geoengineering strategy.
- To assess the effects of DMS changes under a modified Representative Concentration Pathway 4.5 (RCP4.5) scenario.
Main Methods:
- Utilized mini-ensembles of a coupled atmosphere-ocean model (CESM1(CAM5)).
- Simulated two emissions scenarios: a control RCP4.5 and an idealized scenario with enhanced DMS emissions.
- Analyzed the transient climate response to these scenarios.
Main Results:
- Enhanced DMS emissions led to a significant cooling effect, offsetting greenhouse gas-induced warming globally.
- The geoengineering approach showed potential for solar radiation management.
- Adverse impacts on rainfall patterns were observed, with potential negative consequences for water resources.
Conclusions:
- Ocean fertilization via DMS enhancement can induce a climate cooling effect, offering a potential geoengineering pathway.
- While beneficial for global temperature, this method poses risks to regional water availability and human livelihoods.
- Changes in marine phytoplankton activity present a complex mix of climate benefits and drawbacks.
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