Wednesday, January 30, 2013

Global warming and Precipitation

Global warming from greenhouse gases affects rainfall patterns in the world differently than that from solar heating, according to a study.
The scientists, led by Jian Liu (Chinese Academy of Sciences) and Bin Wang (International Pacific Research Center, University of Hawaii at Manoa), showed that global rainfall has increased less over the present-day warming period than during the Medieval Warm Period, even though temperatures are higher today than they were then.
As a result of global warming, precipitation is likely to increase in high latitudes and the tropics and to decrease in already dry subtropical regions.

Read More
http://phys.org/news/2013-01-greenhouse-gases-solar-complexity-global.html
http://www.nature.com/nature/journal/v493/n7434/full/nature11784.html

doi:10.1038/nature11784

Thursday, January 17, 2013

Global Warming Trends ... alarming

Long-Term Global Warming Trend Continues

2012 was the ninth warmest year since 1880.
The map at the top depicts temperature anomalies, or changes, by region in 2012; it does not show absolute temperature. Reds and blues show how much warmer or cooler each area was in 2012 compared to an averaged base period from 1951–1980. For more explanation of how the analysis works, read World of Change: Global Temperatures.

The average temperature in 2012 was about 14.6 degrees Celsius (58.3 degrees Fahrenheit), which is 0.55°C (1.0°F) warmer than the mid-20th century base period. The average global temperature has increased 0.8°C (1.4°F) since 1880, and most of that change has occurred in the past four decades.

Read more: http://earthobservatory.nasa.gov/IOTD/view.php?id=80167&src=eoa-iotd