20th century oscillations show intensification that may be linked with global warming
By Summit Voice
SUMMIT COUNTY — Atmospheric scientists say they’ve used coral records to trace the history of El Niño cycles going back about 7.000 years, showing that 20th century oscillations are much stronger than those captured in the fossil record.
But the study also showed large natural variations in past ENSO strength, making it difficult to attribute the 20th century intensification of ENSO to rising carbon dioxide levels. Such large natural fluctuations in ENSO activity are also apparent in multi-century climate model simulations, but the 20th century intensification stands out as statistically significant and could be linked with global warming.
SUMMIT COUNTY —Temperatures don’t have to reach record highs to fuel extreme melting of the Greeland ice cap, according to new research suggesting that glaciers could undergo a self-amplifying cycle of melting and warming that would be difficult to halt.
Tedesco, who directs CCNY’s Cryospheric Processes Laboratory, collected data for the analysis this past summer during a four-week expedition to the Jakobshavn Isbræ glacier in western Greenland. Their arrival preceded the onset of the melt season.
SUMMIT COUNTY — National Weather Service forecasters are pinpointing the potential effects of strengthening La Niña conditions this winter, predicting a dry winter on Colorado’s eastern plains and in the southern part of the state, but above-average snowfall for the northwestern quadrant of Colorado.
The forecasters said there is still some disagreement about whether this year’s La Niña will be a strong event, but they said that the strong cooling of sea surface temperatures in the eastern Pacific and a positive feedback loop of the ocean and atmosphere are tilting the odds in favor of a moderate to strong La Niña.