El Niño didn’t exactly go gangbusters in southwest Colorado last month, where the key river basins received only about 35 percent of average February precipitation. Statewide mountain precipitation was only slightly better, at 56 percent of normal.
“February in the mountains of Colorado is typically a slightly drier month than compared to say, April. But a dry February like this could have big ramifications should April and May not pan out” said Brian Domonkos, Snow Survey Supervisor with the Natural Resources Conservation Service. Continue reading “Climate: U.S. West very dry in February”→
Current regional dry spell appears to be the most severe in more than 900 years
The Mediterranean region may already be feeling the impacts of human-caused climate change, according to a new tree ring study that compared an ongoing drought in the region with historic climate conditions.
‘A normal year in the Southwest is now drier than it once was’
A subtle long-term shift in atmospheric patterns driven by global warming could lead to longer and more intense droughts in the southwestern U.S. and other semi-arid regions. Most climate models suggest that that a belt of higher average pressure that now sits closer to the equator will move north. This high-pressure belt is created as air that rises over the equator moves poleward and then descends back toward the surface.
Abrupt climate change ripples through desert ecosystems
Freshwater springs outside Las Vegas offer some clues about how global warming will affect desert ecosystems, according to the U.S. Geological Survey.
New research shows the seeps and springs expanded and contracted dramatically in response to past episodes of abrupt climate change, even disappearing altogether for centuries at a time when conditions became too warm.
“This is a story of water,” said Springer. “Water was plentiful in the desert at times in the past, but when climate warmed, springs and wetlands dried up, and the plants and animals living in the harsh desert environment were out of luck,” said USGS scientist Kathleen Springer. Continue reading “Nevada fossil records offer global warming clues”→
The Pacific Ocean’s El Niño-La Niña cycle may become a dominant factor in West Coast weather by the end of this century and lead to more frequent weather extremes, according to a new study published in Nature Communications. Based on the findings, California could see the number of extreme droughts and floods by 2100, the researchers found.
‘The rate of the recent drying in the Horn of Africa is unprecedented in the last 2,000 years …’
The Horn of Africa, encompassing Somalia, Djibouti and Ethiopia, has been drying in sync with increases in global greenhouse gas emissions and could experience for frequent and intense droughts as global warming continues, scientists said after studying layers of sediments from the Gulf of Aden.
The detailed core samples enabled the scientists to create a highly accurate temperature record going back 2,000 years. The Horn of Africa has suffered deadly droughts every few years in recent decades and the study findings suggest the region will get progressively less rain during the crucial “long rains” season of March, April and May. Continue reading “Study: Horn of Africa droughts linked with global warming”→
Research in Africa suggests drought and heatwaves results in lower birth weight
A complex statistical analysis of health and climate data suggests there may be a link between climate change and birth weight, at least in parts of the developing world. The findings show that a pregnant woman’s exposure to reduced precipitation and an increased number of very hot days results in lower birth weight.