Arctic Siberia Summers 10 Degree Celsius Warmer in Last Interglacial
A study currently under review in Climate of the Past has reported that Arctic Siberia experienced summer temperatures up to 10 degree Celsius warmer than today during the Last Interglacial period, approximately 115,000 to 130,000 years ago. Researchers have drawn these conclusions from sediment cores and fossil remains, highlighting how polar ecosystems responded to heightened warmth in that era. The findings have been presented by Dr Lutz Schirrmeister and colleagues from the Helmholtz Center for Polar and Marine Research in Germany.
Arctic Warming Amplified by Ice Albedo Feedback
According to the study, warming during the Last Interglacial was intensified in Arctic regions compared to the broader northern hemisphere due to ice-albedo feedback mechanisms. These processes involve the melting of ice sheets, which reduces solar radiation reflected into space and enhances warming. The research team conducted their fieldwork in coastal sections along Siberia’s Dmitry Laptev Strait, where permafrost-related landscapes have been preserved.
As per reports, the unique thermokarst topography in the area, formed by thawing ice-rich permafrost, provided insights into past climate conditions. Layers of peat, clays, and silts were analysed from sediment cores collected between 1999 and 2014. Fossil evidence, including pollen, insects, and mollusks, allowed the team to reconstruct historical environments, revealing significant shifts in vegetation and climate over time.
Vegetation Shifts and Temperature Changes
Sources have indicated that grasslands and tundra-steppe dominated the region during the early Last Interglacial, giving way to birch and larch forests at its peak. Fossilised plant material suggests mean summer temperatures reached 15 degree Celsius, significantly higher than the current average of 3 degree Celsius. Winter temperatures during this period are estimated at -38 degree Celsius, compared to today’s average of -34 degree Celsius.
Significance of Studying the Last Interglacial
It was noted that while the Last Interglacial primarily affected summer temperatures, ongoing anthropogenic climate change is expected to impact winters more significantly. Dr Schirrmeister emphasised the importance of understanding Earth’s sensitivity to rising temperatures, in his statement, as the melting of Arctic permafrost and sea ice continues to be observed today.
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A breakthrough discovery by an international team of scientists has highlighted the role of a gold-sulfur complex in the formation of gold deposits on Earth. The study, co-authored by Adam Simon, Professor of Earth and Environmental Sciences at the University of Michigan, was recently . It details the previously unknown conditions under which gold is transported from deep within the Earth’s mantle to the surface.
Role of the Gold-Trisulfur Complex
According to the research, published in the Proceedings of the National Academy of Sciences (2024), a unique gold-trisulfur complex forms under specific pressure and temperature conditions in the mantle, situated 30 to 50 miles beneath active volcanic zones. This complex, which has been debated in scientific circles, plays a significant role in the enrichment of gold in magma that travels to the surface. The findings shed light on why certain subduction zones, where tectonic plates converge, are particularly rich in gold deposits.
Volcanic Activity and Gold Deposits
The study highlights subduction zones around the Pacific Ring of Fire, where volcanic activity is prevalent, as key areas for gold formation. These regions, including locations such as New Zealand, Japan, Alaska, and Chile, provide the ideal geological environment for magma to carry gold from the mantle to surface deposits. The researchers link the processes behind volcanic eruptions to the mechanisms that concentrate gold in these zones.
Scientific Findings and Practical Applications
The researchers developed a thermodynamic model to simulate mantle conditions and confirm the existence of the gold-trisulfur complex. This model not only validates earlier theories about gold-sulfur interactions but also provides a clearer picture of the conditions required for gold-rich mineral systems to form.
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Two perentie lizards, among the largest species of lizards globally, have hatched at the Los Angeles Zoo, marking the first time this species has been bred there. Native to Australia, these carnivorous reptiles are known for their impressive size, often exceeding 8 feet in length and weighing over 40 pounds. The zoo, which is one of the few facilities outside Australia to successfully breed them, is now home to the newly hatched pair, who are being carefully monitored in a controlled environment.
First Breeding Success Highlighted by Experts
According to reports from usnews.com, the perentie lizards were bred and hatched for the first time in the facility’s history. Byron Wusstig, curator at the Los Angeles Zoo, shared with the Associated Press that achieving this milestone is a significant accomplishment for the team. These lizards, classified as Varanus giganteus, are rarely seen in zoos outside their native Australia, despite not being endangered.
Special Care for Hatchlings in Early Stages
Reports confirm that the hatchlings are thriving under close observation by the zoo’s staff. They are being kept off-exhibit in a specially managed setting to ensure their health during these crucial initial months. The lizards will eventually join the Australia section of the zoo, near the Komodo dragon habitat, where the father is currently on display.
This species is characterised by its distinct brown skin adorned with cream or yellow markings. Their diet, as stated in reports, includes turtle eggs, insects, birds, small mammals, marsupials, and other reptiles, all of which are consumed whole. As per zoo officials, this breeding success highlights the capabilities of the institution in conserving and caring for unique species, contributing to the understanding of their behaviour and needs in captivity.
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A comprehensive study involving 91 researchers, including Eske Willerslev from the Lundbeck Foundation GeoGenetics Centre at the University of Copenhagen, has provided critical insights into the genetic and linguistic origins of Indo-European populations. The findings, identify two significant migrations during the Bronze Age that contributed to the spread of steppe ancestry across the Mediterranean. The genetic research links Spanish, French and Italian populations to Bell Beaker ancestry, while Greek and Armenian populations have been connected directly to Yamnaya ancestry from the Pontic Steppe region.
Analyses of Steppe Ancestry Distribution
According to the study published on the preprint server bioRxiv, steppe ancestry in Western Europe is attributed to Bell Beaker populations, who combined their genetic profile with local Neolithic farmers. These migrations align with linguistic theories suggesting a shared origin for Italo-Celtic languages. In contrast, Greek and Armenian ancestry reflects direct Yamnaya influence, with no significant local admixture. This divergence between Eastern and Western Mediterranean populations aligns with the Italo-Celtic and Graeco-Armenian linguistic hypotheses.
Genomic and Strontium Isotope Studies
As per reports, the study sequenced 314 ancient genomes dated between 2,100 and 5,200 years ago from regions including Spain, Italy, Greece, and Turkey. A total dataset of 2,403 genomes was analysed, alongside 224 strontium isotope assessments to trace human mobility. Results showed active migration patterns during the Bronze Age, with non-local individuals identified in Greece, Cyprus and Italy. A notable finding was a Scandinavian individual in Cyprus, suggesting Mediterranean trade routes extended far beyond local boundaries.
Implications for Linguistic Migration Models
These findings substantiate linguistic theories connecting Italic and Celtic languages to Bell Beaker ancestry and Greek and Armenian languages to Yamnaya ancestry. The research contradicts alternative hypotheses, including Indo-Greek and Italo-Germanic models. This study provides a clearer understanding of the genetic and linguistic history of Indo-European populations, offering a vital reference for future investigations into ancient human migrations
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