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Crocodile evolution rebooted by Ice Age glaciations

Science Daily - Wed, 02/17/2021 - 08:10
Crocodiles are resilient animals from a lineage that has survived for over 200 million years. Skilled swimmers, crocodiles can travel long distances and live in freshwater to marine environments. But they can't roam far overland. American crocodiles (Crocodylus acutus) are found in the Caribbean and Pacific coasts of the Neotropics but they arrived in the Pacific before Panama existed, according to new research.

Thermal energy storage with new solution meant to ease grid stress

Science Daily - Tue, 02/16/2021 - 17:59
Scientists have developed a simple way to better evaluate the potential of novel materials to store or release heat on demand in your home, office, or other building in a way that more efficiently manages the building's energy use.

Slow motion precursors give earthquakes the fast slip

Science Daily - Tue, 02/16/2021 - 17:59
At a glacier near the South Pole, earth scientists have found evidence of a quiet, slow-motion fault slip that triggers strong, fast-slip earthquakes many miles away.

How icebergs really melt -- and what this could mean for climate change

Science Daily - Tue, 02/16/2021 - 12:34
Iceberg melt is responsible for about half the fresh water entering the ocean from the Antarctic and Greenland ice sheets. Accurately modelling how it enters is important for understanding potential impact on ocean circulation.

Past earthquakes triggered large rockslides in the Eastern Alps

Science Daily - Tue, 02/16/2021 - 12:34
Geologists shed new light on a long-lasting debate about the trigger mechanism of large rockslides. Lake mud in two Alpine lakes in Tyrol reveal that rare strong earthquakes are the final cause of multiple, prehistoric rockslides in the Eastern Alps. The steep rock slopes were degraded by a series of prehistoric earthquakes, larger than any of the historically documented events in the region of the past ~1000 years.

Quantum leaps in understanding how living corals survive

Science Daily - Tue, 02/16/2021 - 10:50
A new imaging technique has been developed to improve our ability to visualize and track the symbiotic interactions between coral and algae in response to globally warming sea surface temperatures and deepening seawaters.

Carbon dioxide dip may have helped dinosaurs walk from South America to Greenland

Science Daily - Mon, 02/15/2021 - 15:02
A new study identifies a climate phenomenon that may have helped sauropodomorphs spread northward across the Pangea supercontinent.

Study on submarine permafrost suggests locked greenhouse gases are emerging

Science Daily - Wed, 02/10/2021 - 12:34
Frozen land beneath rising sea levels currently traps 60 billion tons of methane and 560 billion tons of organic carbon. Little is known about the frozen sediment and soil -- called submarine permafrost -- even as it slowly thaws and releases methane and carbon that could have significant impacts on climate.

Rapid ice retreat during last deglaciation parallels current melt rates

Science Daily - Wed, 02/10/2021 - 12:33
Imagine an ice chunk the size of Hawaii disappearing, almost instantaneously, from an ice sheet. That is what happened in the Storfjorden Trough in the Arctic Ocean some 11,000 years ago.

Arctic permafrost releases more CO2 than once believed

Science Daily - Tue, 02/09/2021 - 10:38
There may be greater CO2 emissions associated with thawing Arctic permafrost than ever imagined. An international team of researchers has discovered that soil bacteria release CO2 previously thought to be trapped by iron. The finding presents a large new carbon footprint that is unaccounted for in current climate models.

New factor in the carbon cycle of the Southern Ocean identified

Science Daily - Tue, 02/09/2021 - 07:34
The Southern Ocean is one of the key regions for understanding the climate system. The photosynthesis-performing plankton there contribute significantly to controlling the CO2 concentration in the atmosphere. But which factors favor or limit plankton growth? Researchers have now published a study showing for the first time that, in addition to the micronutrient iron, manganese can play an important role. Among other things, the results have implications for understanding ice ages in the past.

How rocks rusted on Earth and turned red

Science Daily - Mon, 02/08/2021 - 15:19
How did rocks rust on Earth and turn red? A new study has shed new light on the important phenomenon and will help address questions about the Late Triassic climate more than 200 million years ago, when greenhouse gas levels were high enough to be a model for what our planet may be like in the future.

Better understanding the reasons behind Arctic's amplified warming

Science Daily - Mon, 02/08/2021 - 10:43
A professor is calling on scientists to conduct dedicated process studies and to share their data and research findings on Arctic warming. She stresses the importance of studying how aerosols and clouds interact, as these highly complex and poorly understood mechanisms play a key role in climate change, but are also strongly affected by it. According to her, the region is in rapid transition and scientists need to act to not run behind.

How iodine-containing molecules contribute to the formation of atmospheric aerosols

Science Daily - Mon, 02/08/2021 - 07:55
Chemists have helped discover that iodic acids can rapidly form aerosol particles in the atmosphere, giving scientists more knowledge of how iodine emissions can contribute to cloud formation and climate change.

Arctic stew: Understanding how high-latitude lakes respond to and affect climate change

Science Daily - Fri, 02/05/2021 - 18:22
To arrive at Nunavut, turn left at the Dakotas and head north. You can't miss it -- the vast tundra territory covers almost a million square miles of northern Canada. Relatively few people call this lake-scattered landscape home, but the region plays a crucial role in understanding global climate change.

Global warming found to be culprit for flood risk in Peruvian Andes, other glacial lakes

Science Daily - Thu, 02/04/2021 - 11:01
Human-caused warming is responsible for increasing the risk of a glacial outburst flood from Peru's Lake Palcacocha, threatening the city below. This study is the first to directly link climate change with the risk of flooding from glacial lakes, which are growing in number and size worldwide.

The Arctic Ocean was covered by a shelf ice and filled with freshwater

Science Daily - Wed, 02/03/2021 - 11:34
The Arctic Ocean was covered by up to 900 m thick shelf ice and was filled entirely with freshwater at least twice in the last 150,000 years. This surprising finding is the result of long-term research. With a detailed analysis of the composition of marine deposits, the scientists could demonstrate that the Arctic Ocean as well as the Nordic Seas did not contain sea-salt in at least two glacial periods. Instead, these oceans were filled with large amounts of freshwater under a thick ice shield. This water could then be released into the North Atlantic in very short periods of time. Such sudden freshwater inputs could explain rapid climate oscillations for which no satisfying explanation had been previously found.

Potentially toxic plankton algae may play a crucial role in the future Arctic

Science Daily - Wed, 02/03/2021 - 08:05
As the sea ice shrinks in the Arctic, the plankton community that produces food for the entire marine food chain is changing. New research shows that a potentially toxic species of plankton algae that lives both by doing photosynthesis and absorbing food may become an important player in the Arctic Ocean as the future sea ice becomes thinner and thinner.

Sea level will rise faster than previously thought

Science Daily - Tue, 02/02/2021 - 15:45
There are two main elements to observe when assessing sea level rise. One is the loss of the ice on land and the other is that the sea will expand as it gets warmer. Researchers have constructed a new method of quantifying just how fast the sea will react to warming. Former predictions of sea level have been too conservative, so the sea will likely rise more and faster than previously believed.

Sea ice kept oxygen from reaching deep ocean during last ice age

Science Daily - Tue, 02/02/2021 - 15:44
Extensive sea ice covered the world's oceans during the last ice age, which prevented oxygen from penetrating into the deep ocean waters, complicating the relationship between oxygen and carbon.

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