Ice Ages
Articles tagged with Ice Ages
What triggered Earth's shift from a greenhouse to an icehouse climate and the onset of the Late Paleozoic Ice Age?
A research team found that enhanced silicate weathering contributed to CO2 drawdown and the onset of the Late Paleozoic Ice Age, reducing atmospheric CO2 levels by approximately 800 ppm. This process also boosted marine nutrient supply and productivity, leading to the observed shifts in carbon isotopes.
African frogs haven’t forgotten the ice ages. Scientists can tell by where they live.
Scientists have found that African frogs' diversity is linked to historical climate conditions, indicating they adapted to changing environments. The study suggests that even after 12,000 years, tropical frogs still remember the impact of past ice ages on their habitats.
Scientists trace crop viruses back to the last Ice Age
A new international study reveals that the ancestors of modern crop viruses likely emerged before the last Ice Age, affecting both wild and cultivated plants. The viruses, spread by leaf-eating beetles, infect various crops and wild species, posing risks to agriculture and natural ecosystems.
Flickering glacial climate may have shaped early human evolution
A study of deep-sea cores suggests that rapid climate swings during the Quaternary Period led to variability in glacial periods, which may have influenced early human evolution. The research found that climate conditions switched from stable warmth to cold chaos around 2.7 million years ago.
Ancient rocks reveal annual climate cycles during Snowball Earth
Scientists have discovered evidence of repeating climate cycles operating every few years to decades during the Cryogenian glaciation, a period known as Snowball Earth. The findings suggest that these cycles were likely exceptions rather than the norm, and were triggered by small patches of open ocean in the tropics.
Unexpected feedback in the climate system
Researchers found a surprising correlation between West Antarctic Ice Sheet retreat and marine algae growth over the past 500,000 years. The study suggests that global warming may lead to reduced CO2 uptake if the ice sheet continues to shrink.
Curtin scientists freeze out ice-age delivery theory for Stonehenge stones
Researchers analyzed over 500 zircon crystals and found no evidence of glaciers transporting the bluestones to Stonehenge. The study strengthens the case for human transport, leaving the exact method a mystery. Advanced mineral fingerprinting techniques provided key insights into geological history.
Tiny Mars’ big impact on Earth’s climate
Mars plays a measurable role in shaping Earth's long-term climate patterns, including ice ages, through its gravitational influence and orbital cycles. The study suggests that Mars' presence is necessary for the existence of major climate cycles, which have driven evolutionary changes on Earth.
Patagonia’s ice sheet danced to a different beat
The study reveals that the Patagonian ice sheet underwent periods of expansion and contraction, contrary to earlier assumptions. The driving force for long-term fluctuations was found to be changes in summer seasons and solar radiation, known as integrated summer energy.
Natural barriers disturb the ecosystems in northern Sweden’s rivers
Research from Umeå University reveals that natural barriers shape the flow of water and hinder plant dispersal in rivers shaped by the last Ice Age. The study found no clear correlations between drainage area and channel width, or consistent increase in plant species diversity downstream.
Carbon cycle flaw can plunge Earth into an ice age
Researchers at UC Riverside discovered a carbon burial process in the ocean that can cause Earth's temperature to overshoot and cool down, potentially triggering an ice age. The study suggests that the planet's thermostat is not functioning as expected due to changes in atmospheric oxygen levels.
UVic research predicts worldwide glacier erosion
A global analysis using machine learning predicts glacial erosion rates for 180,000 glaciers worldwide, with most experiencing erosion between 0.02-2.68 millimeters per year. The study identifies complex factors influencing erosion, including temperature, water under the glacier and rock type.
Did a meteor impact trigger a landslide in the Grand Canyon?
An international team of researchers proposes that a meteorite impact just west of Winslow, Arizona, created Meteor Crater and triggered a massive landslide in the Grand Canyon. The study found evidence of a paleolake forming at the same time, with driftwood dating back to around 55,000 years.
Sediments exposed by glacier melt begin emitting greenhouse gases over time
A new study found that chemical reactions in newly uncovered glacial sediments initially suppress greenhouse gas emissions, but as soil matures, it produces more methane, contributing to warming. The research provides insights into the role of soil and water in the climate change cycle.
Melting glaciers could trigger more explosive eruptions globally, finds research
Researchers found that thick ice cover suppressed volcanic eruptions, but as glacial ice melts, pressure builds and magma is released, leading to more frequent and explosive eruptions. This phenomenon could occur worldwide, including Antarctica, and may have global climate impacts, including long-term warming.
Frozen, but not sealed: Arctic Ocean remained open to life during ice ages
Research team studied sediment cores and found evidence of seasonal sea ice in the Arctic Ocean. The study's findings suggest that warm Atlantic water continued to flow into the Arctic gateway, keeping some parts of the ocean from freezing over completely.
Famous Ice Age ‘puppies’ likely wolf cubs and not dogs, study shows
A new study has found that two ancient Ice Age 'puppies' are likely to be wolf cubs, not dogs, based on genetic analysis of their gut contents and other chemical 'fingerprints'. The discovery provides insight into the diet and breeding behaviors of Pleistocene wolves, which lived in a diverse environment with varied ecosystems.
Study reveals different phases of evolution during ice age
A recent study has discovered that cold-adapted species began evolving 2.6 million years ago, with many modern species emerging around 700,000 years ago. The research provides insights into the evolution of Arctic ecosystems and highlights the importance of understanding past adaptations to inform conservation efforts.
Alaska: Ancient cave sediments provide new climate clues
Scientists have discovered land-based evidence of ancient meltwater pulses from the Cordilleran Ice Sheet, shedding new light on climate change mechanisms. The findings suggest that additional climate forces were needed to kick-start ice-sheet retreat beyond energy changes in Earth's orbit.
Melting glaciers at the end of the Ice Age may have sped up continental drift, fueled volcanic eruptions
Researchers found that melting ice sheets in North America and Greenland may have increased horizontal motion of plates by 25% and up to 40% at the Mid-Atlantic Ocean Ridge. This could lead to an increase in volcanic eruptions in Iceland.
Sophisticated pyrotechnology in the Ice Age: This is how humans made fire tens of thousands of years ago
Researchers analyzed three hearths in Ukraine's Epigravettian site, finding evidence of advanced fire use during the Last Glacial Maximum. The fires reached temperatures over 600°C, proving humans' control over pyrotechnics despite extreme environmental stresses.
Climate change and prehistoric human populations: Eastward shift of settlement areas at the end of the last ice age
A new study reveals significant shifts in prehistoric hunter-gatherer populations in Europe due to climate changes at the end of the last Ice Age. The population declined by half, but some areas in central Europe showed stability or even an increase in population size, indicating human migration towards the east.
Mega-iceberg from Antarctica on collision course with South Georgia: Harbinger of things to come?
Researchers from Utrecht University studied icebergs' routes during rapid ice cap deterioration and found evidence of ancient material from Antarctica near South Orkney Island. The study suggests that Antarctica had an ice cap in the late Eocene, and large icebergs could survive in warm ocean conditions.
Repeated invasions shape NZ’s bird life
Researchers used mitogenome data to discover many species colonized Aotearoa at the start of the Ice Age, likely from Australia. Iconic endemic birds, like Haast's eagle, are actually Ice Age arrivals, not recent immigrants.
Global warming and mass extinctions: What we can learn from plants from the last ice age
Researchers used ancient plant DNA to study the impact of global warming on plant diversity and interactions. They found that temperature changes led to fundamental shifts in ecological conditions, with some plant species supporting each other during cold periods.
500-year-old Transylvanian diaries show how the Little Ice Age completely changed life and death in the region
Researchers examined 16th-century written sources to understand climate change in Transylvania. The study found that hot weather was recorded more frequently than cold weather, with extreme events like floods and famines occurring due to climate variations.
Underwater fossil bed discovered by collectors preserves rare slice of Florida’s past
A rare underwater fossil bed discovered by collectors in Florida's Big Bend region has preserved a unique window into the past. The site, dating back to the middle Irvingtonian North American land mammal age, offers insights into evolutionary transitions and speciation.
Evidence of cannibalism 18,000 years ago
Researchers discovered signs of human remains being manipulated and dissected, indicating cannibalism among Late Ice Age societies in Central Europe. The findings suggest that cannibalism may have occurred due to conflicts over resources or territories, rather than necessity.
Ancient agricultural strategies revealed: how pre-industrial communities adapted to climate changes
Researchers reconstructed past crop repertoires, showcasing how communities diversified their agriculture to ensure food security amidst changing environmental conditions. The study offers valuable lessons for modern agriculture, informing sustainable practices and policies in the face of greater climate variability.
Study links climate change and earthquake frequency
A recent Colorado State University study demonstrates that climate change can affect earthquake frequency, as glaciers recede and slip along faults increases. This suggests that earthquake activity could increase as glaciers melt, impacting hazard assessment and seismology.
Study reveals mammoth as key food source for ancient Americans
Scientists uncovered the first direct evidence that ancient Americans primarily relied on mammoth and other large animals for food. The study sheds light on both the rapid expansion of humans throughout the Americas and the extinction of large ice age mammals.
Deep ocean clues to a million-year-old ice age puzzle revealed in new study
A recent study provides fresh insights into the ocean's role in climate during the Mid-Pleistocene Transition, a period of change that began about one million years ago. The research suggests that changes in the deep ocean played an equally important but nuanced role in driving climate cycles.
Genome of the aurochs decoded
The study reveals large genomic differences between European aurochs, North Asian aurochs, and South Asian ancestor, with evidence of human intentional feeding and targeted domestication. The genome of the central European aurochs was fully decoded for the first time, providing insights into the history of wild cattle in Europe and Asia.
New ice core data provides insight into climate ‘tipping points’ during the last Ice Age
Research from multiple ice cores in Greenland provides new understanding of Dansgaard-Oeschger events, which represent 'tipping points' in Earth's climate. The findings suggest interactions between the Atlantic Meridional Overturning Circulation and wintertime sea ice play a key role in these events.
Adaptability of trees persists after millions of years of climate change
Researchers found that seven common European forest trees have preserved their genetic diversity over millions of years, defying expectations. This resilience is attributed to unique characteristics such as long generation times and pollen dispersal capabilities.
Research reveals reality of Ice Age teen puberty
Researchers analyzed ancient human bones to assess puberty stages in 13 Ice Age teens, ages 10-20. Most entered puberty at 13.5 and reached adulthood between 17-22 years old.
Study explains why Amazon is such a biodiverse paradise
A new study reveals that the Amazon's remarkable variety of plants and animals was shaped by woodlands and savannas connecting forest islands during the last Ice Age. The researchers used advanced climate and vegetation modelling techniques to provide a new understanding of the region's evolution.