global climate change and ocean current
TRANSCRIPT
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Global Climate Change
and Ocean Current
YSCN0029 Climate Change
through Earth History
Presented by: Jacky Poon,
Candy Cheung, Connie Yu,
Vannessa Poon,.
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Is the Planet Warming?10 warmest year records since 1990: 1998, 2002 & 2003 (joint), 2001, 1997, 1995,1990 &1999 (joint), 1991 & 2000 (joint).
Analyses of over 400 proxy climate series (from trees, corals, ice cores and historical records) showed that 20th century was the warmest century.
The Inter-governmental Panel on Climate Change (IPCC) in its most recent report stated:“most of the observed warming over the last 20 years is likely to have been due to the increase in greenhouse gas concentrations.”
The warming leads to changes in ocean current and in the world.
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Uneven distribution of sun’s energy
Current movements
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Deep water wave
Coriolis Effect
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Relationship between Atlantic Thermohaline Circulation and Global Warming
Significant slowing of the ocean circulation that transfers warm water to the North Atlantic Ocean
The southern hemisphere would become warmer and the northern hemisphere would become colder
Why?
Result of Global Warming:
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Higher temperatures under global warming
Increasing the precipitation, melting nearby sea ice, mountain glaciers and the Greenland ice sheet
Add fresh water to the northern oceans
The influx of fresh water reduce the surface salinity and density
Dense water then sinks and slowly travels through the deep water southward into the Southern Hemisphere
Lead to the significant slowing of the thermohaline circulation
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The North Atlantic Sink
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Impacts of ocean current slow downDistinct regional variability
Bitter winters as Little Ice Age 17th-19th centuries
possibly related to changes in the strength of North Atlantic thermohaline circulation
10,000 years ago, a period called ‘Younger Dryas’ caused European temperature dropped >10C
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The Day After Tomorrow?
Solution
The Framework Convention on Climate Change (UNFCCC)
International Cooperation : Kyoto Protocol; USA rejectedProduce less green house gases, eg CO2 , MethaneChina`s responsibility