Marine responses to climate change
3 important questions on Marine responses to climate change
What are the sea level effects?
- Thermal expansion of water molecules
- melting of land ice result in more fluid water
- range shifts due to rises and drops of sea level during (inter)glaciations
- melting of sea ice does not make a difference to sea level, land ice does!
What are the ocean circulation effects?
Thermohaline changes:
- input of large freshwater pulses leads to blockage in sinking of saline water, which causes a cold snap on land and in the water
- blockage of this circulation causes oxygen shortdage in deeper waters (where the most diverse life is)
What are the effects on ocean chemistry?
More dissolved Co2 --> lower pH
Organisms are less able to form calcium carbonate shells/skeletons
Other forms of coral due to other CO concentrations (former forms; corals that secrete calcium carbonate, modern: coral that secrete aragonite)
Other negative effects on corals: high salinity and high turbidity decrease photosynthesis.
Organisms are less able to form calcium carbonate shells/skeletons
Other forms of coral due to other CO concentrations (former forms; corals that secrete calcium carbonate, modern: coral that secrete aragonite)
Other negative effects on corals: high salinity and high turbidity decrease photosynthesis.
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