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Rapid Changes in the Past

Page history last edited by PBworks 13 years, 12 months ago

Mark asks what changes in the past


Hi Mark,


Try: http://www.ncdc.noaa.gov/paleo/pubs/alley2000/alley2000.html


This shows the last few thousand years from Greenland and specifically the Younger Dryas which is the most rapid recent climate change.

"Near-simultaneous changes in ice-core paleoclimatic indicators of local, regional, and more-widespread climate conditions demonstrate that much of the Earth experienced abrupt climate changes synchronous with Greenland within thirty years or less. Post-Younger Dryas changes have not duplicated the size, extent and rapidity of these paleoclimatic changes. "


The Younger Dryas event was the most rapid in recent history with slower cooling in steps, but warming was very rapid with Greenland warming by about 10 C in just 30 years dwarfing any modern change.


Going further back the EPICA ice cores from Dome C in Antarctica which show that each interglacial of the last half million years has been warmer than today (figure 2 panel b).




Climate science doesn't seem to understand why we live in the coolest interglacial of the last half million years.... and this mean we also live in the interglacial with the lowest sea levels. During the Eemian interglacial of 125,000 years ago sea levels were 6-10 meters higher than today and during the MIS 11 interglacial of 420,000 year ago sea level was 20+ meters higher than today.


Here's an article on sea level during these past interglacials:





--- In ClimateConcern@yahoogroups.com, "Mark Laidlay"



> Can some one here please supply me with a link to information on

> how the planet's temperature has changed over the last few thousand

> years. Obviously I am interested in highs and lows but also how

> fast it has changed "then" and now.


> I find people denying climate change tell me that the planet

> temperature was higher at some historical event than it is now, I

> would like to have the facts.


> Thanks in anticipation


> Mark in Melbourne


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