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Global warming spells trouble for fish populations in desert rivers of the Southwest

desert rain edited

Dwindling precipitation in the Southwest spells trouble for native fish. bberwyn photo.

Study shows significant loss of fish habitat by mid-century

Staff Report

FRISCO — Big sections of vulnerable stream habitat for native fish in the Southwest are likely to disappear by mid-century as global warming causes stream flows to dwindle.

By 2050, stream-drying events could increase by 17 percent, and the number of zero-flow days could go up by 27 percent in the Verde River Basin, affecting species like speckled dace (Rhinichthys osculus), roundtail chub (Gila robusta) and Sonora sucker (Catostomus insignis).

The drying trend will fragment aquatic habitat, hampering feeding and spawning. Some populations that are already isolated may very well disappear, said Ohio State University researcher Kristin Jaeger, an assistant professor at the School of Environment and Natural Resources. Continue reading

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Study tracks rapid ice age climate shifts

A cyclonic storm spins over the center of the Arctic Ocean. Photo courtesy NASA Earth Observatory

A cyclonic storm spins over the center of the Arctic Ocean. Photo courtesy NASA Earth Observatory.

Findings show delicate balance of ice sheets, winds and ocean currents

Staff Report

FRISCO — The superstorm depicted in “The Day After Tomorrow” may be completely implausible, but that doesn’t mean the Earth’s climate system is always as stable as it seems now.

New research by a team of scientists at the Alfred Wegener Institute shows how there may have been significant shifts in ocean circulation and wind patterns that happened in the span of just a few decades — not even the blink of an eye by geological time standards. Continue reading

Climate: July global temps near record high

Year to-date tied for third-warmest

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Hot July for Planet Earth. Courtesy NASA.

Staff Report

FRISCO — With the exception of a few cool pockets, including parts of the eastern United States, above-average temperatures prevailed across most of the globe last month, making it the fourth-warmest July on record.

The globally average land-surface temperature was the 10-warmest on record and the average global sea-surface temperature for July tied with 2009 as the warmest ever, according to the monthly global state of the climate report from NOAA’s National Climatic Data Center. Continue reading

Climate: Heat-trapping greenhouse gases the biggest driver of global glacier meltdown

‘In our data we find unambiguous evidence of anthropogenic contribution to glacier mass loss’

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Shrinking glaciers on the Dachstein Mountains in Austria will affect water supplies far downstream in local areas and in distant rivers. bberwyn photo.

Staff Report

FRISCO — Some of the world’s glaciers were shrinking before the onset of unchecked heat-trapping pollution, but the human factor in the glacial equation has grown exponentially in the past few decades.

A new modeling study led by scientists at the University of Innsbruck (Austria) shows that only about 25 percent of the global glacier mass loss during the period of 1851 to 2010 is attributable to anthropogenic causes. However, between 1991 and 2010 the fraction increased to about two-thirds.

“In the 19th and first half of 20th century we observed that glacier mass loss attributable to human activity is hardly noticeable but since then has steadily increased,” said researcher Ben Marzeion, explaining that scaled-down regional models can detect an anthropogenic influence in America and the Alps, where glacier changes are particularly well documented. Continue reading

Climate: Bioparticles in dusty air may be key to rain and snow formation

Tiny bioparticles in atmospheric dust play a big role in the formation of raindrops and snowflakes. bberwyn photo.

Tiny bioparticles in atmospheric dust play a big role in the formation of raindrops and snowflakes. bberwyn photo.

Researchers starting to take nuanced look at chemical composition of aerosols

Staff Report

FRISCO —Scientists have long known that tiny grains of airborne dust are key players in the formation of rain and snow, driving precipitation patterns across the drought-stricken western U.S. and other areas.

New research suggests that  the exact chemical make-up of that dust, including microbes found in it, is the key to how much rain and snow falls from clouds.  The information could help better predict rain events, as well as explain how air pollution from a variety of sources influences regional climate in general.

“We’ve learned that not all of the particles in the air at high altitudes have the same influence on clouds. We’re starting to think that these differences contribute to how rain gets distributed,” said Dr. Kim Prather, who presented her findings at the 248th National Meeting & Exposition of the American Chemical Society last week in San Francisco. Continue reading

Environment: It pays to clean up beaches

Study shows costs of coastal litter

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Beach-goers tend to avoid dirty beaches, even it means driving farther and spending more money to find a clean spot. bberwyn photo.

STAFF REPORT

FRISCO —Littered beaches are a costly economic liability in California, as beach-goers tend to avoid local beaches if they’re dirty. The economic study, funded by NOAA’s Marine Debris Program, showed that having no marine debris on the beach and good water quality were the two most important factors in deciding which beach to go to.

Given the enormous popularity of beach recreation throughout the United States, the magnitude of recreational economic losses associated with marine debris has the potential to be substantial.  Continue reading

Morning photo: Sunday set

Oh, Colorado!

wetlands sunrise Colorado

Wetlands sunrise, Frisco, Colorado.

FRISCO — Our Sunday set is a grab-bag of shots from the last 10 days or so, starting with another spectacular sunrise scene at the Meadow Creek wetlands in Frisco. And since we’ve been on the road reporting for the crowfunded Climate Rangers environmental journalism project, we’re also featuring a few images from outside Summit County. Continue reading

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