Tag: extreme weather

USGS study shows that extreme rainstorms are critical for groundwater recharge in the West

‘Without them, groundwater resources become depleted’

Raindrops ... @bberwyn photo.
Raindrops … @bberwyn photo.

Staff Report

Extreme precipitation events that cause severe flooding, loss of life and property damage aren’t exactly at the top of the weather wish list for most people. But it turns out they play a key role in replenishing underground aquifers in the western U.S.

The importance of groundwater will continue to grow in the years ahead — an era of population growth and climate disruption, so understanding the connection between big storms and groundwater recharge is critical, according to U.S. Geological Survey and Bureau of Reclamation scientists who have released a new study analyzing large, multi-year, quasi-decadal groundwater recharge events in the northern Utah portion of the Great Basin from 1960 to 2013.

They evaluated groundwater levels and climate information and identified five large recharge events with a frequency of about 11 to 13 years. Findings show these events provide a significant amount of groundwater recharge and storage across the northern Great Basin, causing water levels to rise in aquifers. Continue reading “USGS study shows that extreme rainstorms are critical for groundwater recharge in the West”

Climate: July breaks global temperature mark — again

Mideast heatwave set records

All northern hemisphere land areas recorded above average temperatures in July 2016.

Staff Report

There was no letup to the global heatwave in July, according to the National Oceanic and Atmospheric Administration, which reported this week that the month ended up as the warmest ever recorded on planet Earth.

Federal climate trackers said it was the 15th month in a row with above average temps, making it the longest such streak in NOAA’s 137 years of record keeping. The global temperature for July has been above average for 40 years in a row, since 1976. July was also the 379th consecutive month with temperatures above the 20th century average. The last month with temperatures below the 20th century average was December 1984, at 0.09 degrees Celsius below average.

The combined average temperature over global land and ocean surfaces was 0.87 degrees Celsius above the 20th century average, besting the previous July record set in 2015 by 0.06 degrees Celsius. Across the world’s land areas, the average temperature was 1.10 degrees Celsius above the 20th century average. Continue reading “Climate: July breaks global temperature mark — again”

UN warns of heatwave health risks

Northern Africa and the Mideast have been baking under extreme temperatures much of the summer.

Refugee areas hit hard by extreme heat this summer

Staff Report

As global warming drives record heatwaves around the world, the UN is warning that more must be done to warn and protect vulnerable populations from extreme heat.

Some studies show that, even in developed countries, deaths spike during hot weather. The risk may be even higher in developing countries, the UN Office for Disaster Risk Reduction said last week in a news release.

“Millions of people around the world should be receiving heat-related warnings and advisories if we are to avoid a repeat of the thousands of deaths which occurred last year from heatwaves notably in Asia and Europe,” said Robert Glasser, the UN Secretary-General’s special representative for disaster risk reduction.

“More effort is required to ensure that the poor and vulnerable including refugees, children, older persons and persons living with disabilities are reached with early warnings and that practical measures are taken to ensure they have access to water and adequate shelter and protection from the heat and the sun,” Glaser said, adding that emergency service managers need to “step up the focus on extreme heat” to reduce mortality. Continue reading “UN warns of heatwave health risks”

Climate: Death Valley sets heat record in June

Death Valley heat record
Ripples on Mesquite Flat sand dunes, Photo courtesy Death Valley National Park.

Average temperature for the month more than 6 degrees above the historic norm

Staff Report

The deadly heatwave that spread across the southwestern U.S. in June also brought a new record high average temperature to Death Valley, one of the hottest places on Earth. According to the National Park Service, last month was the warmest June on record in the national park, with the average temperature for the whole month registering at 101.9 degrees Fahrenheit — about 6 degrees above the long-term average.

Death Valley’s average daily high temperature this June was 115.5 degrees Fahrenheit and the average overnight low was 88.2 degrees. In spite of a record-setting average temperature, Death Valley only set a new daily record one day last month, with 126 degrees recorded on June 21, 2016. The highest temperature ever recorded in Death Valley in June was just a few years ago: 129 degrees on June 30, 2013. Continue reading “Climate: Death Valley sets heat record in June”

Abrupt climate change linked with ocean current shutdown

‘Rollercoaster’ temps prevailed as iceberg flotillas invaded North Atlantic

Can Arctic icemelt shut down crucial ocean currents? @bberwyn photo.

Staff Report

By studying chemical tracers in seafloor sediments, scientists have been able to show that periods of abrupt climate change during the last ice age are somehow linked with dramatic changes in key ocean currents, especially the Atlantic meridional overturning circulation, which carries heat from the tropics to the northern latitudes.

Specifically, the study looked at series of abrupt climate changes that occurred between 60,000 and 25,000 years ago, ending as the last ice age peaked. A press release on the study describes it as an era when “temperatures in the Northern Hemisphere went on a rollercoaster ride, plummeting and then rising again every 1,500 years or so.”

“People have long supposed this link between overturning circulation and these abrupt climate events. This evidence implicates the ocean,” said L. Gene Henry, the lead author of the study and a graduate student at Columbia University’s Lamont-Doherty Earth Observatory. The findings, published in the journal Science, show for the first time that the ocean’s overturning circulation slowed during every one of those temperature plunges — at times almost stopping. Continue reading “Abrupt climate change linked with ocean current shutdown”

Australian researchers call for more coastal monitoring in the face of expected climate change impacts

Damaged homes along the foreshore of Sydney's Collaroy Beach, hit by powerful storms in early June. Mitchell Harley/UNSW
Damaged homes along the foreshore of Sydney’s Collaroy Beach, hit by powerful storms in early June. Mitchell Harley/UNSW.

June storms highlight impacts of rising seas, shifting storm patterns

Staff Report

Just after the Australian government announced massive cuts to the country’s science agency, researchers are warning that there’s more of a need then ever to track climate change impacts.

A series of recent storms that lashed Australia’s east coast are reminder that rising sea level presents a growing threat to coastal communities, according scientists with the University of New South Wales.

“The damage we’ve seen is a harbinger of what’s to come,” said Ian Turner, director of the Water Research Laboratory at the University of New South Wales. “Climate change is not only raising the oceans and threatening foreshores, but making our coastlines much more vulnerable to storm damage. What are king high tides today will be the norm within decades.” Continue reading “Australian researchers call for more coastal monitoring in the face of expected climate change impacts”

More evidence that melting Arctic ice drives widespread changes in northern hemisphere weather patterns

‘Blocking highs’ becoming more common over Greenland

greenland aerial view
What happens in Greenland doesn’t stay in Greenland. Climate shifts in the Arctic affect the rest of the northern hemisphere. @bberwyn photo.

Staff Report

Just a few weeks after scientists reported record early melting on parts of the Greenland Ice Sheet, a new study helps explain some of the recent dramatic climate shifts in the high latitudes of the northern hemisphere.

Stationary high pressure systems over Greenland have become more frequent since the 1980s, said University of Sheffield geographer Prof. Edward Hanna, adding that the pattern is also linked with extreme weather over northwest Europe, including unusually wet conditions in the UK in the summers of 2007 and 2012.

The study, published in the International Journal of Climatology, looked at large-scale weather patterns over Greenland going back to 1851 using a measure called the Greenland Blocking Index, which marks the how strong the high pressure systems are, how long they last and how often they occur. Continue reading “More evidence that melting Arctic ice drives widespread changes in northern hemisphere weather patterns”