Global Climate Change And Ocean Current

2,446 views
2,275 views

Published on

Published in: Technology, Education
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
2,446
On SlideShare
0
From Embeds
0
Number of Embeds
29
Actions
Shares
0
Downloads
102
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Global Climate Change And Ocean Current

  1. 1. Global Climate Change and Ocean Current YSCN0029 Climate Change through Earth History Presented by: Jacky Poon, Candy Cheung, Connie Yu, Vannessa Poon, .
  2. 3. Is the Planet Warming? <ul><li>10 warmest year records since 1990: 1998, 2002 & 2003 (joint), 2001, 1997, 1995,1990 &1999 (joint), 1991 & 2000 (joint). </li></ul><ul><li>Analyses of over 400 proxy climate series (from trees, corals, ice cores and historical records) showed that 20 th century was the warmest century. </li></ul><ul><li>The Inter-governmental Panel on Climate Change (IPCC) in its most recent report stated: </li></ul><ul><li>“ most of the observed warming over the last 20 years is likely to have been due to the increase in greenhouse gas concentrations.” </li></ul><ul><li>The warming leads to changes in ocean current and in the world. </li></ul>
  3. 4. <ul><li>Uneven distribution of sun’s energy </li></ul>Current movements
  4. 5. <ul><li>Deep water wave </li></ul>Coriolis Effect
  5. 6. Relationship between Atlantic Thermohaline Circulation and Global Warming <ul><li>Significant slowing of the ocean circulation that transfers warm water to the North Atlantic Ocean </li></ul><ul><li>T he southern hemisphere would become warmer and the northern hemisphere would become colder </li></ul>Why? Result of Global Warming:
  6. 7. <ul><li>Higher temperatures under global warming </li></ul><ul><li>I ncreasing the precipitation , melting nearby sea ice , mountain glaciers and the Greenland ice sheet </li></ul><ul><li>A dd fresh water to the northern oceans </li></ul><ul><li>The influx of fresh water reduce the surface </li></ul><ul><li>salinity and density </li></ul><ul><li>D ense water then sinks and slowly travels through the deep water southward into the Southern Hemisphere </li></ul><ul><li>L ead to the significant slowing of the thermohaline circulation </li></ul>
  7. 8. The North Atlantic Sink
  8. 9. Impacts of ocean current slow down <ul><li>D istinct regional variability </li></ul><ul><li>Bitter winters as Little Ice Age 17 th -19 th centuries </li></ul><ul><li>possibly related to changes in the strength of North Atlantic thermohaline circulation </li></ul><ul><li>10,000 years ago, a period called ‘Younger Dryas’ caused European temperature dropped >10C </li></ul>
  9. 10. The Day After Tomorrow? <ul><li>Solution </li></ul><ul><li>The Framework Convention on Climate Change (UNFCCC) </li></ul><ul><li>International Cooperation : Kyoto Protocol; USA rejected </li></ul><ul><li>Produce less green house gases, eg CO2 , Methane </li></ul><ul><li>China`s responsibility </li></ul>

×