Climate change far worse than thought before
…Over the past 25 years temperatures have increased at a rate of 0.19 degree Celsius per decade. The trend has continued over the last 10 years despite a decrease in radiation from the sun.
* The studies show extreme hot temperature events have increased, extreme cold temperature events have decreased, heavy rain or snow has become heavier, while there has been increase in drought as well.
They also show that the intensity of cyclones has increased in the past three decades in line with rising tropical ocean temperatures.
* Satellites show recent global average sea level rise (3.4 mm/year over the past 15 years) to be about 80 percent above IPCC predictions. This acceleration is consistent with a doubling in contribution from melting of glaciers, ice caps, and the Greenland and West-Antarctic ice sheets.
New estimates of ocean heat uptake are 50 percent higher than previous calculations. Global ocean surface temperature reached the warmest ever recorded in June, July and August 2009.
…* A wide array of satellite and ice measurements demonstrate that both the Greenland and Antarctic ice sheets are melting at an increasing rate. Melting of glaciers and ice-caps in other parts of the world has also accelerated since 1990.
The contribution of glaciers and ice-caps to global sea level rise has increased from 0.8 mm per year in the 1990s to 1.2 mm per year today.
…The net loss of ice from the Greenland ice sheet has accelerated since the mid-1990s and is now contributing 0.7 mm per year to sea level rise due to both increased melting and accelerated ice flow. Antarctica is also losing ice mass at an increasing rate, mostly from the West Antarctic ice sheet due to increased ice flow. Antarctica is currently contributing to sea level rise at a rate nearly equal to Greenland.
* Summer-time melting of Arctic sea-ice has accelerated far beyond the expectations of climate models. The area of summertime sea-ice 2007-09 was about 40 percent less than the average prediction from IPCC climate models in the 2007 report.
…* New ice-core records...show that carbon dioxide levels are higher now than they have been during the last 800,000 years.
The Times of India, January 3, 2010