Ocean and Climate

Currently, organic material in the ocean is mainly degraded with oxygen (left). Together with a warming of the ocean this leads to deoxygenation. In a future, warmer ocean (right), more organic material is respirated by denitrification with nitrate. The associated oxygen saving would even exceed the oxygen loss due to warming. Graphic: Rita Erven/GEOMAR
 

The far–future ocean: warm yet oxygen-rich

Model study identifies an oxygen-saving mechanism from sloppy nitrogen-cycle interactions

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A diver next to a mesocosm off the coast of Gran Canaria. Photo: Michael Sswat/GEOMAR (CC BY 4.0)
 

Ocean acidification stimulates mass development of toxic algae

Long-term experiment reveals disruption of the pelagic food web under high CO2 conditions

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The graph shows precipitation (minus evaporation) over the Indian Ocean from June to August. The points mark the places of origin of previously used climate archives. The two points in the Andaman Sea mark the new sediment cores that have been used for the first time. Graphic: Daniel Gebregiorgis
 

One million years of precipitation history of the monsoon reconstructed

Sediment cores allow new insights into the mechanisms of this climate phenomenon

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Dr. Mark Hopwood during a measurement campaign on the coast of Greenland. Photo: Thomas Juul-Pedersen / GCRC
 

Glacier depth affects plankton blooms off Greenland

Study shows complex connection between meltwater discharge and nutrient input

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The Irminger Sea seen from the research vessel MARIA S. MERIAN. It is one of the few regions in the world where deep convection occurs. The process is a key component global ocean circulation system. Photo: Arne Bendinger / GEOMAR
 

Warm summers could weaken ocean circulation

Long-term observations reveal the influence of increased surface freshening on convection in the subpolar North Atlantic

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Aerosols in the atmosphere should reflect part of the solar irradiation - that is the main idea of the Solar Radiation Management. However this method carries long-term risks. Graphict: Kiel Earth Institute
 

Beware of the "Temperature Debt"

Artificial cooling of the atmosphere with aerosols carries a long-term risk

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Bathymetric map of the Nyegga region off the coast of Central Norway. Graphic: Jens Karstens / GEOMAR
 

Why did gas hydrates melt at the end of the last ice age?

GEOMAR researchers find links between sedimentation and methane seeps on the seafloor off the coast of Norway

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