The basic GISS temperature analysis scheme was defined in the late 1970s by James Hansen when a method of estimating global temperature change was needed for comparison with one-dimensional global climate models. Prior temperature analyses, most notably those of Murray Mitchell, covered only 20-90°N latitudes. Our first published results (Hansen et al. 1981) showed that, contrary to impressions f ... read more >>
Last spring, I noted that recent global temperatures seemed to be primarily a combination of a long-term trend and modulation by El Niño and La Niña (here and here). In September, I took this idea one step further and issued global temperature anomaly forecasts for 2012 and 2013 based entirely on a linear trend plus ENSO (here). Today, we see how the 2012 forecast turned out, and update the for ... read more >>
In my article in Tuesday’s Science Times about the risks of long-term sea level rise, and in an accompanying podcast, I reported on the link between past instances of global warming, caused by natural fluctuations in the climate, and higher shorelines.
Based on a study of these past variations, some scientists believe that even if we stopped burning fossil fuels tomorrow, we would be due for a ... read more >>
Groundwater depletion of six Western aquifers over time ... read more >>
Water vapour plays a key role in the Earth's energy balance. Almost 50% of the absorbed solar radiation at the surface is used to cool the surface, through evaporation, and warm the atmosphere, through release of latent heat. Latent heat is the single largest factor in warming the atmosphere and in transporting heat from low to high latitudes. Water vapour is also the dominant greenhouse gas and ... read more >>
New estimates from a Norwegian research project show that policymakers attempting to contain global warming at less than 3.6 degrees Fahrenheit have an attainable target. While most news that comes out about global warming is typically negative and ominous, this study has put a slightly more positive twist on the unfolding story of climate change. “These results are truly sensational,” said Carol ... read more >>
As Texas' drought wears into its third year, water fights are accelerating within the state as farmers, cities and industry compete for limited supplies from dwindling reservoirs. But many of these seem like small-scale skirmishes compared with the complex and high-stakes battles along Texas' borders that stem from pacts signed decades ago.
Texas is currently locked in a legal conflict over wat ... read more >>
1) What is the story?
The US Department of Agriculture and Coca-Cola are working together to try and restore watersheds which have been damaged or altered by development, wildfires, and agriculture. They hope to slow down runoff and replenish groundwater, in hope of helping farmers and citizens.
2) Why is it important?
This shows that businesses, organizations and the gov ... read more >>
The Tigris and Euphrates river basins, at the heart of the Fertile Crescent, lost enough fresh water between 2003 and 2009 to fill the Dead Sea, according to a study that used NASA satellite data to measure hydrological changes in parts of Turkey, Syria, Iraq, and western Iran. One-fifth of the net water loss was attributed to dry soils and a withered snowpack, the study found. Evaporation from l ... read more >>
With the European land surface warming rapidly, rainfall patterns changing and sea levels rising ever faster, southern Europe will suffer most from climate change. But there is an urgent need for countries across the continent to adapt to change, according to the European Environment Agency. ... read more >>