[OANNES Foro] Persistent cool conditions in the eastern tropical Pacific may explain the current global warming "hiatus."

[Mario Cabrejos]

Science 28 February 2014: 
Vol. 343 no. 6174 pp. 976-978 
DOI: 10.1126/science.1248115 


The Tropical Pacific Ocean-Back in the Driver's Seat?
Amy Clement1, Pedro DiNezio2
1Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA. 2School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI 96822, USA. E-mail: aclement en rsmas.miami.edu
Summary
Average temperatures at Earth's surface are now higher than they were in the mid-19th century, but the rate of warming has not been steady. A pause in surface warming in the mid-20th century coincided with increases in the atmospheric concentrations of sulfate aerosols, which are generally understood to cool the planet. Surface warming resumed in the 1970s, when strong pollution controls were implemented in developed countries. Thus, a balance of warming by greenhouse gases and cooling by aerosols may explain the variable rates of surface warming in the past century. A pause in global warming since 2000-a global warming "hiatus"-has opened up new questions about natural and human activity-driven (anthropogenic) effects on global mean trends in surface temperature. Recent studies point to the importance of the tropical Pacific in driving these changes.
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