News tagged with greenhouse gas concentrations

Reconstructing the African humid period

During the end of the last ice age, there were dramatic changes in rainfall across a vast swath of Africa. As the world's large ice sheets receded in northern and southern latitudes, rainfall in much of Africa ...

dateDec 05, 2014 in Earth Sciences
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Greenhouse gases linked to African rainfall

Scientists may have solved a long-standing enigma known as the African Humid Period - an intense increase in cumulative rainfall in parts of Africa that began after a long dry spell following the end of the ...

dateDec 04, 2014 in Earth Sciences
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Warmest oceans ever recorded

"This summer has seen the highest global mean sea surface temperatures ever recorded since their systematic measuring started. Temperatures even exceed those of the record-breaking 1998 El Niño year," says ...

dateNov 14, 2014 in Earth Sciences
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Pinpointing climate change uncertainty

The National Climate Assessment, released recently by the White House, describes a troubling array of climate woes currently affecting the United States—from intense droughts and heat waves to more extreme precipitation ...

dateJun 09, 2014 in Environment
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Portable frequency comb rolls out of the lab

A PML team is hitting the road with a fine-tooth comb. Scientists in the Quantum Electronics and Photonics Division have devised a portable optical frequency comb that is capable of laboratory-grade measurements ...

dateMar 21, 2014 in General Physics
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