Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Brèves → Brèves 2016 → Southwest sliding into a new normal : Drier conditions. Weather patterns that bring rain becoming less frequent (USA)

Southwest sliding into a new normal : Drier conditions. Weather patterns that bring rain becoming less frequent (USA)

ScienceDaily (February 4, 2016)

Southwest sliding into a new normal : Drier conditions. Weather patterns that bring rain becoming less frequent (USA)

ScienceDaily (February 4, 2016)

The weather patterns that typically bring moisture to the Southwest are becoming more rare, an indication that the region is sliding into the drier climate state predicted by global models, according to a new study.

Climate models generally agree that human-caused climate change will push the southwestern United States to become drier. And in recent years, the region has been stricken by drought. But linking model predictions to changes on the ground is challenging.

In the new study — published online today in the journal Geophysical Research Letters, a publication of the American Geophysical Union — researchers grapple with the cause of current drying in the Southwest to better understand how it might be connected to a warming climate.

For the study, the researchers analyzed 35 years’ worth of data to identify common weather patterns — arrangements of high and low pressure systems that determine where it’s likely to be sunny and clear or cloudy and wet.

They identified a dozen patterns that are usual for the weather activity in the contiguous U.S., then looked to see whether those patterns were becoming more or less frequent.

Story Source  : National Science Foundation

Pour en savoir plus (ScienceDaily)

Page publiée le 5 octobre 2016