Nineteen million years ago, sharks nearly disappeared from Earth's oceans, according to a new study, which provides evidence for a previously unknown mass ocean extinction event.
Researchers at the University of East Anglia have developed technology that will help to protect North American right whales, one of the world's most endangered marine species. The new techniques can remove unwanted noises from recordings, thereby increasing the reliability of detecting right whales before they reach close proximity to large vessels. This can both protect animals and avoid costly shutdowns of offshore operations.
Launching the UN Decade on Ecosystem Restoration, a new UN report says that to address climate change, loss of nature and pollution, the world must deliver on existing commitments to restore at least 1 billion degraded hectares of land -- an area comparable to China - in the next decade and add similar commitments for oceans. The report documents the urgent need for restoration, the financial investment required, and the potential returns for people and nature.
An analysis of sediment cores from the Bering Sea has revealed a recurring relationship between warmer climates and abrupt episodes of low-oxygen "dead zones" in the subarctic North Pacific Ocean over the past 1.2 million years. The findings provide crucial information for understanding the causes of low oxygen or "hypoxia" in the North Pacific and for predicting the occurrence of hypoxic conditions in the future.
Researchers working under the leadership of the Technical University of Munich (TUM) have conducted the first precise and comprehensive measurements of sea level rises in the Baltic Sea and the North Sea. A new method now makes it possible to determine sea level changes with millimeter accuracy even in coastal areas and in case of sea ice coverage. This is of vital importance for planning protective measures.
Researchers have identified the key factors that influence a vital pattern of ocean currents.
New research from the Australian Institute of Marine Science shows table corals can regenerate coral reef habitats on the Great Barrier Reef decades faster than any other coral type. The research suggests overall reef recovery would slow considerably if table corals declined or disappeared on the Great Barrier Reef.
In the deep waters that underlie the productive zones of the ocean, there is a constant rain of organic material called 'marine snow.' Marine snow behaves similarly to real snow: large flakes are rare and fall quickly while abundant smaller flakes take their time. Scientists have now discovered that precisely those features explain why small particles play an important role for the nutrient balance of the oceans. These findings have been published in Nature Communications.
Researchers have developed a new concept to explain the phenomenon known as Green Sahara. They demonstrate that a permanent vegetation cover in the Sahara was only possible under two overlapping rainy seasons. Dr. Enno Schefuß of MARUM - Center for Marine Environmental Sciences of the University of Bremen, Dr. Rachid Cheddadi of the University of Montpellier, and their colleagues have now published their study in the journal PNAS.
Although sun radiation was relatively low, the temperature on the young Earth was warm. An international team of geoscientists has found important clues that high levels of carbon dioxide in the atmosphere were responsible for these high temperatures. It only got cooler with the beginning of plate tectonics, as the CO2 was gradually captured and stored on the emerging continents.