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Climate: UK study eyes links between global warming, extreme flooding

An extratropical cyclone

An extratropical cyclone spread heavy rain across the UK in February 2014. Visit this NASA website for more.

More coastal damage likely as rising seas fuel storm surges

Staff Report

FRISCO —British scientists aren’t quite ready to say that last winter’s record flooding is linked with human-caused global warming, but in a recent study published in the journal Nature Climate Change, they warned that more coastal flooding is likely as sea level rises. Continue reading

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Climate: Rethinking the Arctic carbon cycle

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Permafrost processes will play a big role in Earth’s climate for decades to comes.

New findings critical to climate calculations

Staff Report

FRISCO — Sunlight is the key factor in the process of converting Arctic permafrost carbon into atmospheric carbon dioxide, scientists concluded in a new study that could dramatically change the scientific understanding of the planet’s carbon cycle and the consequences of a permafrost meltdown.

The finding is particularly important because climate change could affect when and how permafrost is thawed, which begins the process of converting the organic carbon into CO2. The research was funded by the National Science Foundation and published in the journal Science. Continue reading

Climate: What happens in the Arctic doesn’t stay in the Arctic

The Fram Strait is a key link in the global ocean circulation system, as the passage for most of the Arctic sea ice exiting the region.

The Fram Strait is a key link in the global ocean circulation system, as the passage for most of the Arctic sea ice exiting the region.

Detailed ocean sediment layers paint clear picture of link between Arctic sea ice movement and ocean currents

Staff Report

FRISCO — An extraordinarily clear deposit of layered seafloor sediments has helped researchers explain the connection between Arctic sea ice movement and the movement of key ocean currents that redistribute warm water across the northern hemisphere.

Specifically, the new study by scientists with the Alfred Wegener Institute in Germany looked at the movement of sea ice through the Fram Strait, between Greenland Svalbard, finding that, when massive quantities of Arctic ice melt and move south through the strait, the Gulf Stream slows, cooling the climate in Europe. Continue reading

Global warming: Heat trapped by greenhouse gases going deep into the Atlantic Ocean

Natural ocean cycles still big factor in pace of global warming

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July 2014 was one of the hottest months ever for Earth.

STAFF REPORT

FRISCO —Ancient currents that circulate the sun’s energy  deep into the Atlantic Ocean may be swallowing up some of the heat trapped by greenhouse gases. In the past decade, the current has intensified, drawing surface heat as deep as mile beneath the surface of the sea, scientists said after analyzing data from a network of ocean buoys.

The new findings may help explain why the pace of warming has slowed, and suggest that, when the current reverts to weaker phase, surface temperatures could spike upward once again.

The study, led by University of Washington scientists and published Aug. 22 in the journal Science, shows that the heat absent from the surface is plunging deep in the north and south Atlantic Ocean, and is part of a naturally occurring cycle. Continue reading

Global warming: Greenland, West Antarctic ice sheets losing volume at record pace

Loss of ice volume doubles in just 5 years

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Arctic and Antarctic ice sheets are losing volume at a record pace. bberwyn photo.

By Bob Berwyn

FRISCO —Detailed new data from satellites and other sources show the world’s major ice sheets losing volume at a record pace, faster than at any time since satellite measurements started about 20 years ago.

Since 2009, the rate of volume loss from the Greenland Ice Sheet has doubled, and the rate of volume loss from the West Antarctic Ice Sheet has tripled, according to the new findings from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research. Continue reading

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

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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

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

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