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Archaeology

The Hidden World of Mountain Streamflow: A Surprise from the West’s Snow-Capped Mountains

Hydrologists show most streamflow out of the West’s mountains is old snowmelt on a multi-year underground journey. New study finds that spring runoff is on average 5 years old.

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The Western United States is home to some of the most extensive agriculture and growing communities in the country. One of the key factors that sustain these developments is the meltwater from snow-capped mountains, which spills out every spring. For years, models have been used to predict the amount of streamflow available each year, assuming a small fraction of snowmelt enters shallow soil, with the remainder rapidly exiting in rivers and creeks. However, new research from University of Utah hydrologists suggests that this is not the case.

According to their findings, most spring runoff heading to reservoirs is actually several years old, indicating that most mountain snowfall has a long journey as groundwater before it leaves the mountains. This means that there is an order of magnitude more water stored underground than most Western water managers account for, said research leader Paul Brooks.

The team collected runoff samples at 42 sites and used tritium isotope analysis to determine the age of the water. Their findings were published in the journal Nature Communications Earth & Environment and co-authored by Utah geology professors Sara Warix and Kip Solomon in collaboration with research scientists around the West.

Determining the age of mountain streamflow is crucial for predicting how mountain hydrology will respond to changes in climate and land use, according to the researchers. They noted that there would be a lag between input storage and response, which means that even though models have been good in the past, they may not be reliable in the future.

The research also highlighted the importance of incorporating groundwater storage component into models to make good decisions moving forward. Brooks conducted sampling in 2022 while on sabbatical, visiting 42 sites twice, once in midwinter and again during spring runoff.

The state of Utah’s tracking is particularly robust, providing continuous streamflow data dating back 120 years. It’s an unparalleled dataset that has enabled hydrologists to document historic cycles in climate and streamflow that would otherwise have been missed, Brooks said.

According to Solomon, the vast majority of Earth’s fresh, usable water is underground, but just how much is there remains a puzzle. Dating water offers clues, and for determining the age of water, Solomon turns to tritium, a radioactive isotope of hydrogen with a half-life of 12.3 years.

The average age of the runoff sampled in the study varies among the catchment basins depending on their geology. The more porous the ground, the older its water is, since the subsurface can hold a lot more water. By contrast, glaciated canyons with low permeability and shallow bedrock, such as Utah’s Little Cottonwood Canyon, provide far less subsurface storage and younger waters, according to the study.

For decades, federal and state water managers have relied on a network of snowpack monitoring sites to provide data to guide forecasts of water availability for the upcoming year. It’s now clear that such snowpack data doesn’t provide a complete picture, according to the researchers.

“For much of the West, especially the Interior West where this study is based, our models have been losing skill,” Brooks said.

The growing disconnect between snowfall, snowpack volumes and streamflow is driven by variability in these large, previously unquantified subsurface water stores. As a case in point, Brooks highlighted the 2022 water year, which saw snowpacks in many Western states that were near or just below average. Yet that year experienced record low groundwater storage, resulting in much below average spring streamflow.

This new understanding of mountain streamflow has significant implications for water management and resource planning, particularly as the West continues to experience climate variability and change.

Ancient Civilizations

Debunking the Elite: New DNA Research Challenges Ancient Ireland’s Incestuous Social Hierarchy

DNA from a skull found at Newgrange once sparked theories of a royal incestuous elite in ancient Ireland, but new research reveals no signs of such a hierarchy. Instead, evidence suggests a surprisingly egalitarian farming society that valued collective living and ritual.

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In ancient Ireland, around 5,000 years ago, the notion that an incestuous social elite ruled over the people was questioned by new research. The study examined DNA evidence from burials at Newgrange, a prehistoric monument, which previously led to speculation about a ruling class or royal family being buried there.

Researchers analyzed a bone skull fragment found in the chamber and discovered that it belonged to an individual who was likely born of incestuous relationships, but also distantly related to others buried in the same tomb. This finding suggested that only certain individuals were buried in the chamber, implying they held special positions in society.

However, researchers from the University of York and University College Dublin have now shown that there is no evidence of an elite class existing economically or socially among nearby settlements, dietary practices, or trade. They believe that ancient Irish society was more equal, as evidenced by shared resources, similar dwellings, and a lack of large settlement systems or trade mechanisms.

Professor Penny Bickle stated, “The evidence points to a much more collective ethos.” She added, “We can only begin to understand these monuments and tombs if we examine the social lives or the communities that built and used them.”

Newgrange is an ancient monument older than Stonehenge and the Pyramids of Giza, believed to have been built by a farming community in County Meath. The original burial place of the skull fragment, NG10, dated to 3340-3020 BC, was questioned, as its genetic clustering typically reflects distant biological relationships rather than close familial ties.

Associate Professor Jessica Smyth noted that people were selected for burial in passage tombs, but the reasons behind this selection are unknown. She also mentioned that bodies were broken down and mixed with cremated remains before being placed in megalithic monuments, making it unclear who the parents of certain individuals might have been.

Professor Penny Bickle concluded, “It is by no means clear that the monument was the first burial site of NG10.” She added, “As it stands, the incestuous origins of NG10 are a one-off compared to all of the DNA data we have for Neolithic Ireland.”

The research, published in Antiquity, suggests that ancient Irish society might have been more inclusive and equal than previously thought.

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Ancient Civilizations

Uncovering Ancient Native American Farms in Michigan: A Drone-Based Study Reveals 1,000-Year-Old Farming System

In the dense forests of Michigan s Upper Peninsula, archaeologists have uncovered a massive ancient agricultural system that rewrites what we thought we knew about Native American farming. Dating back as far as the 10th century, the raised ridged fields built by the ancestors of the Menominee Indian Tribe covered a vast area and were used for cultivating staple crops like corn and squash. Using drone-mounted lidar and excavations, researchers found evidence of a complex and labor-intensive system, defying the stereotype that small, egalitarian societies lacked such agricultural sophistication. Alongside farming ridges, they also discovered burial mounds, dance rings, and possible colonial-era foundations, hinting at a once-thriving cultural landscape previously obscured by forest.

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The Dartmouth-led study has made a groundbreaking discovery in Michigan’s Upper Peninsula, uncovering a 1,000-year-old Native American farm system that challenges preconceived ideas about agriculture in the region. The Sixty Islands archaeological site along the Menominee River features a raised ridge field system dating back to around the 10th century to 1600. This is the most complete ancient agricultural site in the eastern half of the United States.

The researchers surveyed approximately 330 acres using drone-based lidar, which provided a dataset that revealed clusters of ridged garden beds ranging from 4 to 12 inches in height. These raised fields were used by ancestors of the Menominee Indian Tribe of Wisconsin to grow corn, beans, squash, and other plants.

Lead author Madeleine McLeester noted that the scale of this agricultural system is 10 times larger than previously estimated, forcing a reconsideration of preconceived ideas about agriculture in the region and globally. The team’s findings also suggest that the ancestral Menominee communities were modifying the soil to rework the topography, using wetland soils to enrich the soil and remain from fires as compost.

The researchers conducted excavations at the site, recovering charcoal, broken ceramics, and artifacts, which suggested that remains from fires and household refuse were likely used as compost in the fields. The results showed that the farming system was a massive undertaking requiring organization, labor, and know-how to maximize agricultural productivity.

The findings have significant implications for our understanding of ancient agriculture in eastern North America and challenge existing forest history of the Upper Peninsula. The team is continuing their work with the Menominee Indian Tribe of Wisconsin at the Menominee Sixty Islands site, planning to survey the site and locate ancestral Menominee villages.

This study demonstrates the importance of innovative technologies like drone-based lidar in uncovering hidden archaeological features and provides a unique window into pre-Colonial farming practices in the region. The discovery of this 1,000-year-old farm system serves as a reminder of the rich history and cultural heritage of the Native American communities that once thrived in Michigan’s Upper Peninsula.

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Ancient Civilizations

Uncovering Hidden Secrets: A 3,500-Year-Old Cemetery Reveals New Insights into Bronze Age History

Bronze Age life changed radically around 1500 BC in Central Europe. New research reveals diets narrowed, millet was introduced, migration slowed, and social systems became looser challenging old ideas about nomadic Tumulus culture herders.

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The discovery of a 3,500-year-old cemetery in Hungary has shed new light on a pivotal period in Central European history. A team of international researchers, led by Tamás Hajdu and Claudio Cavazzuti, has conducted a comprehensive bioarchaeological investigation into the Bronze Age cemetery at Tiszafüred-Majoroshalom. The findings have rewritten our understanding of this era, revealing significant changes in people’s lives, diets, social systems, and even burial customs.

The multidisciplinary research was based on the excavation of a Bronze Age cemetery that was used during both the Middle Bronze Age (Füzesabony culture) and the Late Bronze Age (Tumulus culture). By comparing the subsistence strategies before and after this era-changing event, the researchers were able to identify key differences in people’s lifestyles.

The study aimed to answer whether the spread of the Tumulus culture was a result of new groups arriving or if it was simply an evolution of the autochtonous people’s way of life. The team also examined whether changes in settlement patterns around 1500 BC were indicative of a shift towards more mobile and pastoral lifestyles.

The results of this groundbreaking research are nothing short of revolutionary:

* Dietary changes: Nitrogen stable isotope studies revealed that people’s diets became more uniform but poorer during the Late Bronze Age, contradicting previous ideas about the Tumulus culture’s supposed focus on animal husbandry.
* Introduction of broomcorn millet: Carbon isotope analyses indicated that the consumption of this fast-growing and high-energy plant began at the start of the Late Bronze Age, marking the earliest known occurrence in Europe.
* Decreased mobility: Strontium isotope investigations showed that populations from the Middle and Late Bronze Ages had distinct mobility patterns. Fewer immigrants were identified during the Late Bronze Age, with a higher presence of individuals arriving from further geographical regions.

The study’s findings have significant implications for our understanding of this pivotal period in European history. By combining traditional archaeological and anthropological studies with modern bioarchaeological analyses, researchers can now better grasp the complex changes associated with the emergence of the Tumulus culture.

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