Climate Change Charts

A central Greenland ice core shows an interesting temperature record going back about 50,000 years.

histo61-1Well what do you know – there was a “hockey stick” shaped increase in temperatures. But let’s look back a little farther:

histo5-1Around the year 1000 there was a Medieval Warming Period (MWP) followed by a Little Ice Age (LIA). How about even further back:

histo4-1What we see is a cooling trend for about 3,000 years. That little hockey stick leaves us still cooler than average.


In the historical perspective, recent warming is almost invisible.






Record growth in Antarctic ice

The Antarctic sea ice has been setting almost daily records for its extent. As of July 29, there had been 7 new records in 8 days. That was 70,000 sq mi larger than the previous (2010) record, and about 340,000 sq mi larger than the 30-year average. For comparison, New Hampshire is about 9,300 sq mi.

Meanwhile, on the other end of the globe, the Danish Meteorological Institute reports that Arctic temperatures have been lower than the 50-year average for more than two months. July 30 the temperature hit zero degrees Celcius.

UPDATE: August 3rd saw yet another record for the extent of  Antarctic sea ice. Now 11 days in a row. And the Arctic summer has been the shortest on record. “Normally the high Arctic has about 90 days above freezing. This year there was less than half that.”