Posted on August 29, 2014 by Bob Berwyn
Devils Hole pupfish — a poster child for climate extinction? Photo courtesy USFWS.
Rare fish species in steep decline as global, regional temperatures soar
FRISCO — Rare fish living in desert freshwater springs in Nevada may be adapted to warm weather, but they may not be able to survive long-term global warming, researchers said this week, outlining the threats facing endangered Devils Hole pupfish.
At times, the population of the fish has been as low as just 35 individuals, and the geothermal water on a small shelf near the surface of an isolated cavern in the Nevada desert where the pupfish live is heating up as a result of climate change and is likely to continue heating to dangerous levels.
From the 1970s through the mid-1990s, the population appeared stable, but 1997 marked the start of a long-term decline that is probably linked with global warming, according to scientists who closely watch the fish. The population dropped to an all-time low of just 65 fish in the fall of 2013, with a further decline expected this year that will push the species toward extinction. Continue reading
Filed under: biodiversity, climate and weather, endangered species, Environment, global warming | Tagged: biodiversity, climate change, Devils Hole pupfish, endangered species, global warming | Leave a comment »
Posted on August 29, 2014 by Bob Berwyn
Sea level is rising, and will continue to rise for centuries even if we cut greenhouse gas emissions.
Addressing non-climatic impacts will improve long-term resilience
FRISCO — From mountains, forests and rivers down to the seashore, a common theme among researchers is that, in many places, human impacts stemming from land use and development still outweigh the global warming signal.
That includes coastal regions, were there is an immediate need to tackle the threats from non-climatic changes, an international research team said this week after a detailed review of Intergovernmental Panel on Climate Change assessments. Continue reading
Filed under: climate and weather, Environment, global warming | Tagged: climate change, coastal adaptation, global warming, sea level rise | Leave a comment »
Posted on August 27, 2014 by Bob Berwyn
Odds of 30-year dry spells increase dramatically as global temps rise
Green bars indicate wet periods, the larger the bar the more unusually wet. In a similar way, yellow indicates dry and droughty periods. The graph stretches from January 1895 on the left to last month on the right, showing how the cycle of droughts alternating with wet years has changed, with dry years becoming more prevalent.
By Summit Voice
FRISCO — Tree ring records clearly show that the southwestern U.S. experienced megadroughts long before the anthropogenic global warming era. One such decades-long dry spell may have been a factor in the collapse of the Anasazi civilization at Mesa Verde.
But the steady buildup of heat-trapping gases in the atmosphere is loading the dice in favor of another megadrought sooner, rather later, according to scientists with Cornell University, the University of Arizona and U.S. Geological Survey. The chances of a decade-long drought is now at least 50 percent, and there’s a 20 percent to 50 percent chance of a 30-year megadrought.
“For the southwestern U.S., I’m not optimistic about avoiding real megadroughts,” said Toby Ault, Cornell assistant professor of earth and atmospheric sciences and lead author of the paper. “As we add greenhouse gases into the atmosphere – and we haven’t put the brakes on stopping this – we are weighting the dice for megadrought conditions.” Continue reading
Filed under: climate and weather, Drought, extreme weather, global warming | Tagged: Arizona, California drought, climate change, global warming, greenhouse gases, megadrought, New Mexico, Southwest | Leave a comment »
Posted on August 26, 2014 by Bob Berwyn
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
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
Filed under: climate and weather, extreme weather, global warming | Tagged: Arctic sea ice, climate attribution studies, climate change, global warming, Jet stream, UK 2014 flooding | Leave a comment »
Posted on August 24, 2014 by Bob Berwyn
Permafrost processes will play a big role in Earth’s climate for decades to comes.
New findings critical to climate calculations
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
Filed under: Arctic, climate and weather, global warming | Tagged: Arctic, climate change, Environment, global carbon cycle, global warming, permafrost | 1 Comment »
Posted on August 23, 2014 by Bob Berwyn
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
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
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Posted on August 22, 2014 by Bob Berwyn
Natural ocean cycles still big factor in pace of global warming
July 2014 was one of the hottest months ever for Earth.
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
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