What is "space weather"? And how might it affect weather on Earth?
Researchers have discovered a formerly undetected impact of space weather on the polar atmosphere, which may explain some previously unexplained variations in winter weather patterns. Their results, published today (Tuesday 14 October), in the journal Nature Communications could have important implications for seasonal weather forecasting.
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A parasite spread by cat poop is causing a big problem for endangered sea otters in California, and researchers have finally figured out how. Sea otters were nearly wiped out by the fur trade at one point, but they've been slowly making a comeback thanks to conservation efforts and protection under the Endangered Species Act. While they're on the road to recovery the latest numbers from the U.S. Geological Survey released last month shows they're population growth has stalled, with the biggest issue being that they're dying in record numbers.
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Using a first-of-its-kind, high-resolution numerical model to describe ocean circulation during the last ice age about 21,000 year ago, oceanographer Alan Condron of the University of Massachusetts Amherst has shown that icebergs and meltwater from the North American ice sheet would have regularly reached South Carolina and even southern Florida. The models are supported by the discovery of iceberg scour marks on the sea floor along the entire continental shelf.
Such a view of past meltwater and iceberg movement implies that the mechanisms of abrupt climate change are more complex than previously thought, Condron says. "Our study is the first to show that when the large ice sheet over North America known as the Laurentide ice sheet began to melt, icebergs calved into the sea around Hudson Bay and would have periodically drifted along the east coast of the United States as far south as Miami and the Bahamas in the Caribbean, a distance of more than 3,100 miles, about 5,000 kilometers."
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La temperatura global es probable que aumente de 3.3 a 5.6 grados centÃgrados para finales de este siglo, a menos que las negociaciones internacionales sobre el clima en ParÃs el próximo año son más eficaces de lo esperado, según un informe publicado el lunes por el Programa Conjunto MIT sobre la Ciencia y PolÃtica del Cambio Climático Global El aumento previsto de la temperatura supera el umbral determinado por las Naciones Unidas, o sea, el necesario para evitar impactos más graves del cambio climático, la alteración de los patrones de precipitación y el aumento de las presiones de la población y el crecimiento económico.
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