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Increased snowfall will offset sea level rise from melting Antarctic ice sheet

Science Daily - Thu, 08/19/2021 - 09:27
A new study predicts that any sea level rise in the world's most southern continent will be countered by an increase in snowfall, associated with a warmer Polar atmosphere. Using modern methods to calculate projected changes to sea levels, researchers discovered that the two ice sheets of Greenland and Antarctica respond differently, reflecting their very distinct local climates.

Thwaites glacier: Significant geothermal heat beneath the ice stream

Science Daily - Wed, 08/18/2021 - 07:39
Ice losses from Thwaites Glacier in West Antarctica are currently responsible for roughly four percent of the global sea-level rise. This figure could increase, since virtually no another ice stream in the Antarctic is changing as dramatically as the massive Thwaites Glacier. Until recently, experts attributed these changes to climate change and the fact that the glacier rests on the seafloor in many places, and as such comes into contact with warm water masses. But there is also a third, and until nowone of the most difficult to constrain, influencing factors. In a new study, German and British researchers have shown that there is a conspicuously large amount of heat from Earth's interior beneath the ice, which has likely affected the sliding behavior of the ice masses for millions of years. This substantial geothermal heat flow, in turn, are due to the fact that the glacier lies in a tectonic trench, where the Earth's crust is significantly thinner than it is e.g. in neighboring East Antarctica.

The Arctic Ocean’s deep past provides clues to its imminent future

Science Daily - Mon, 08/16/2021 - 10:20
As the Arctic Ocean warms and sea ice shrinks, will the newly exposed sea surface see a plankton population boom and a burgeoning ecosystem in the open Arctic Ocean? Not likely, say a team of scientists who have examined the history and supply rate of nitrogen, a key nutrient. Stratification of the open Arctic waters, especially in the areas fed by the Pacific Ocean via the Bering Strait, will prevent surface plankton from receiving enough nitrogen to grow abundantly.

July was Earth's hottest month on record: NOAA

Science Daily - Fri, 08/13/2021 - 15:48
July 2021 was the world's hottest month ever recorded, according to new global data released by NOAA's National Centers for Environmental Information.

Global warming begets more warming, new paleoclimate study finds

Science Daily - Wed, 08/11/2021 - 15:28
Global warming begets more, extreme warming, new paleoclimate study finds. Researchers observe a 'warming bias' over the past 66 million years that may return if ice sheets disappear.

Global ocean warming started later in the 20th century than previously estimated

Science Daily - Mon, 08/09/2021 - 15:27
In estimations of ocean heat content -- important when assessing and predicting the effects of climate change -- calculations have often presented the rate of warming as a gradual rise from the mid-20th century to today. However, new research could overturn that assumption, suggesting the ocean maintained a relatively steady temperature throughout most of the 20th century, before embarking on a steep rise. The newly discovered dynamics may have significant implications for what we might expect in the future.

Some past sea levels may not have been as high as thought, says study of rising and sinking landmasses

Science Daily - Mon, 08/09/2021 - 15:27
A new study finds that researchers examining signs of past sea levels along various coasts may have failed to accurately correct for long-term ups and downs of the land itself.

Climate change widespread, rapid, and intensifying: IPCC

Science Daily - Mon, 08/09/2021 - 10:11
Scientists are observing changes in the Earth's climate in every region and across the whole climate system, according to the latest IPCC Report. Many of the changes observed in the climate are unprecedented in thousands, if not hundreds of thousands of years, and some of the changes already set in motion -- such as continued sea level rise -- are irreversible over hundreds to thousands of years.

Researchers discover fresh water in the Mediterranean Sea

Science Daily - Fri, 08/06/2021 - 09:43
There is enough water on our planet, but by far the largest part is salt water that is unsuitable as drinking water. Therefore, especially in dry regions of the earth, the search for new freshwater resources is very active. An international team of researchers has now discovered strong evidence of a groundwater deposit off the coast of Malta.

Major Atlantic ocean current system might be approaching critical threshold

Science Daily - Thu, 08/05/2021 - 10:54
A major Atlantic ocean current -- the Atlantic Meridional Overturning Circulation, or AMOC -- may have been losing stability in the course of the last century, according to new research. A potential collapse of this ocean current system could have severe consequences.

Emperor penguins increasingly threatened by climate change

Science Daily - Tue, 08/03/2021 - 11:13
A new study provides valuable new data that highlights how species extinction risk is accelerating due to rapid climate change and an increase in extreme climate events, such as glacial calving and sea ice loss.

Oxygen spike coincided with ancient global extinction

Science Daily - Mon, 08/02/2021 - 10:50
Researchers have found that the extinction at the end of the Permian period coincided with a sudden spike and subsequent drop in the ocean's oxygen content.

Sea levels influence eruptions on volcanic island

Science Daily - Mon, 08/02/2021 - 10:50
The rise and fall of sea levels influence the likelihood of volcanic eruptions on the Greek island of Santorini, new research has discovered. Analyzing the timings of eruptions over hundreds of thousands of years, the researchers found that a 40 meter fall in sea level is a crucial point beyond which eruptions are more likely to occur. The findings could have implications for millions of people living on volcanic islands around the world.

Russian Arctic losing billions of tons of ice as climate warms

Science Daily - Mon, 08/02/2021 - 10:49
Glaciers and ice caps in two archipelagos in the Russian Arctic are losing enough meltwater to fill nearly five million Olympic-size swimming pools each year, research shows.

Decline in CO2 cooled Earth’s climate over 30 million years ago

Science Daily - Mon, 08/02/2021 - 10:49
New research demonstrates that a decline in the concentration of atmospheric CO2 played a major role in driving Earth's climate from a warm greenhouse into a cold icehouse world around 34 million years ago. This transition could be partly reversed in the next centuries due to the anthropogenic rise in CO2.

Icy waters of 'Snowball Earth' may have spurred early organisms to grow bigger

Science Daily - Thu, 07/29/2021 - 11:20
A new study tackles one of the oldest questions in the history of the planet: How did living organisms get so big?

Understanding past climate change 'tipping points' can help us prepare for the future

Science Daily - Thu, 07/29/2021 - 10:18
Of all the creatures on Earth, humans manipulate their environments the most. But, how far can we push it before something drastic happens? Scientists are calling for a better understanding of past extreme climate change events in an attempt to anticipate future changes.

Sediments from lake in Japan reveal stable climate led to origin of agriculture

Science Daily - Thu, 07/29/2021 - 08:52
The advent of agriculture was a significant turning point in the history of modern humans, beyond which humans started living a sedentary life and formed a so-called 'civilization.' However, the environmental factors responsible for this revolutionary change in human lifestyle have been unclear for quite long. A new study on finely layered mud at the bottom of a lake in Japan reveals that the answer to this puzzle lies in the stability of the climate.

‘Less than 1% probability’ that Earth’s energy imbalance increase occurred naturally

Science Daily - Wed, 07/28/2021 - 14:03
Sunlight in, reflected and emitted energy out. That's the fundamental energy balance sheet for our planet -- and for decades, it has been out of balance. The extra energy manifests as higher temperatures, rising sea levels, floods, droughts, more powerful blizzards and hurricanes, and deadlier extreme events. Not only is the imbalance growing, but there's a 99% chance that the growth is due to human activity, calculated a team of researchers.

15,000-year-old viruses discovered in Tibetan glacier ice

Science Daily - Tue, 07/20/2021 - 11:05
Scientists who study glacier ice have found viruses nearly 15,000 years old in two ice samples taken from the Tibetan Plateau in China. Most of those viruses, which survived because they had remained frozen, are unlike any viruses that have been cataloged to date.

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