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Emerging geochemical and biological evidence from Alaskan lake sediment suggests that slight variations in the sun’s intensity have affected sub-polar climate and ecosystems in a predictable fashion during the last 12,000 years.
Researchers at six institutions report the findings in the Sept. 26 issue of the journal Science. The data, they say, help to explain past changes on land and in freshwater ecosystems in northern latitudes and may provide information to help project the future.
For over a decade ESA has used satellites to bounce radar pulses off the Earth and precisely measure the height of ocean and land surfaces. But inland lakes and rivers have been effective blind spots for radar altimetry – at least until now.
Next week ESA previews a new product range called River and Lake Level from Altimetry that provides previously inaccessible information on water levels of major lakes and rivers across the Earth’s surface, derived from Envisat and ERS radar altimete
’Fresh’ shellfish in markets still alive enough to spawn
The global live seafood trade is barely regulated even though it could be a significant conservation threat. New research shows that “fresh” shellfish sold in markets are still alive enough to feed – and so presumably to spawn. This suggests that the seafood trade could spread invasive non-native marine species around the world.
It wouldn’t take much. “Introduced species can spread throughout entire ecos
Plans are underway to test new system
The nations current electric grid system will not work in the future with solar and wind farms providing substantial but intermittent power over long distances.
By 2050, it will take between 15 and 20 Terawatts (TW) of electric power to supply the North American economy. A little under 7 TW is currently used, with most of that consumed in the United States. The “Smart Electric Grid of the Future” must be able to efficiently and securely
New research shows how extraction of whales has resulted in broad and devastating ecosystem impacts
A new paper published in the Proceedings of the National Academy of Sciences hypothesizes that overfishing of whales in the North Pacific Ocean triggered one of the longest and most complex ecological chain reactions ever described, beginning in the open oceans 50 years ago, and leading to the decimation of Alaska’s kelp forest ecosystems today.
The paper, Sequential mega
The largest ice shelf in the Arctic has broken, and scientists who have studied it closely say it is evidence of ongoing and accelerated climate change in the north polar region. The Ward Hunt Ice Shelf is located on the north coast of Ellesmere Island in Canada’s Nunavut territory and its northernmost national park. This ancient feature of thick ice floating on the sea began forming some 4,500 years ago and has been in place for at least 3,000 years.
Warwick Vincent and Derek Mueller