Mysteries of the Earth: FSU researchers predict how fast ancient magma ocean solidified

An illustration of Earth as it existed during part of its formation billions of years ago, when an ocean of magma covered the surface of the planet and stretched thousands of miles deep into the core. A typical cell from a simulation conducted by FSU researchers with the relative positions of atoms are shown in the left
Illustration Credit: Courtesy of Suraj Bajgain / Lake Superior State University

Early in the formation of Earth, an ocean of magma covered the planet’s surface and stretched thousands of miles deep into its core. The rate at which that “magma ocean” cooled affected the formation of the distinct layering within the Earth and the chemical makeup of those layers.

Previous research estimated that it took hundreds of million years for that magma ocean to solidify, but new research from Florida State University published in Nature Communications narrows these large uncertainties down to less than just a couple of million years.

“This magma ocean has been an important part of Earth’s history, and this study helps us answer some fundamental questions about the planet,” said Mainak Mookherjee, an associate professor of geology in the Department of Earth, Ocean and Atmospheric Science.

When magma cools, it forms crystals. Where those crystals end up depends on how viscous the magma is and the relative density of the crystals. Crystals that are denser are likely to sink and thus change the composition of the remaining magma. The rate at which magma solidifies depends on how viscous it is. Less viscous magma will lead to faster cooling, whereas a magma ocean with thicker consistency will take a longer time to cool.

London falcons ate fewer pigeons during lockdowns

Peregrine falcon
Photo Credit: Jasmin777

The study by King’s researchers suggests that predatory birds in urban spaces are vulnerable to changes in human activities that support prey populations.

Changes in peregrine falcon diets during COVID-19 lockdowns highlight the impact of human behavior on urban predators. The findings are from a new study co-authored by King’s researchers published in the British Ecological Society journal, People and Nature.

Researchers from King’s College London and University of Bristol found that during lockdowns, peregrine falcons in London were forced to change their diet away from pigeons since fewer of these birds were being drawn in by human food supplies such as discarded food waste or direct feeding.

Brandon Mak, a PhD student in the Department of Geography who co-led the study with Ed Drewitt from the University of Bristol, said: “Our results indicate that peregrines in larger, highly urbanized cities like London may be more dependent on, and hence more vulnerable to changes in, human activities which support their prey populations, particularly feral pigeons.”

Meteorite crater discovered in French winery

The “Trou du Météore": The crater at the “Domaine du Météore" winery really was caused by a meteorite impact.
Photo Credit: Frank Brenker, Goethe University Frankfurt

With the aim of creating an appealing brand, the name of the “Domaine du Météore" winery near the town of Béziers in Southern France points to a local peculiarity: one of its vineyards lies in a round, 200-meter-wide depression that resembles an impact crater. By means of rock and soil analyses, scientists led by cosmochemist Professor Frank Brenker from Goethe University Frankfurt have now established that the crater was indeed once formed by the impact of an iron-nickel meteorite. In doing so, they have disproved a scientific opinion almost 60 years old, because of which the crater was never examined more closely from a geological perspective.

Countless meteorites have struck Earth in the past and shaped the history of our planet. It is assumed, for example, that meteorites brought with them a large part of its water. The extinction of the dinosaurs might also have been triggered by the impact of a very large meteorite. 

Meteorite craters that are still visible today are rare because most traces of the celestial bodies have long since disappeared again. This is due to erosion and shifting processes in the Earth's crust, known as plate tectonics. The “Earth Impact Database" lists just 190 such craters worldwide. In the whole of Western Europe, only three were previously known: Rochechouart in Aquitaine, France, the Nördlinger Ries between the Swabian Alb and the Franconian Jura, and the Steinheim Basin near Heidenheim in Baden-Württemberg (both in Germany). Thanks to millions of years of erosion, however, for laypersons the three impact craters are hardly recognizable as such.

Salt Could Play Key Role in Energy Transition

Large underground salt formations can aid in the energy transition in myriad ways.
Illustration Credit: UT Jackson School of Geosciences.

A common ingredient – salt – could have a big role to play in the energy transition to lower carbon energy sources.

That’s according to a new study led by researchers at The University of Texas at Austin’s Bureau of Economic Geology.

The study describes how large underground salt deposits could serve as hydrogen holding tanks, conduct heat to geothermal plants, and influence CO2 storage. It also highlights how industries with existing salt expertise, such as solution mining, salt mining, and oil and gas exploration, could help.

“We see potential in applying knowledge and data gained from many decades of research, hydrocarbon exploration, and mining in salt basins to energy transition technologies,” said lead author Oliver Duffy, a research scientist at the bureau. “Ultimately, a deeper understanding of how salt behaves will help us optimize design, reduce risk, and improve the efficiency of a range of energy transition technologies.”

The study was published in the journal Tektonika.

Lakes in Greenland collapse and release meltwater during winter causing Arctic inland ice drift to speed up

Lakes collapse and release meltwater during winter causing inland ice to speed up in Greenland
Photo Credit: Dominique Müller

A team of international researchers has shown for the first time how 18 meltwater lakes in Greenland collapse during winter which cause the edges of the ice to flow faster. The new knowledge is essential for understanding how climate change influences the flow of ice masses in the Arctic.

In the middle of winter in 2018, an almost 50-year-old meltwater lake disappeared from the ice sheet in western Greenland. The lake was covered by snow and ice when it collapsed but stored liquid water inside. The water disappeared into newly formed cracks and drifted down through the approximately 2 km thick layer of ice. The water hit the rock bed under the ice and flowed out from under the ice sheet towards the sea. This meltwater acted as lubrication between the rock bed and the thick ice on top. As a result, the large mass of ice could slide faster towards the coast, accelerating an unusually large region of inland ice. The drainage of this lake caused several other lakes in the adjacent area to collapse too. In total, the collapsed lakes have released approximately 180 million tons of meltwater that has ended up in the world's oceans.

This is shown by new international research based on satellite data and led by the French Université Grenoble Alpes with contributions from DTU Space at The Technical University of Denmark (DTU). This new knowledge has just been published in Geophysical Research Letters.

Black mosses reveal climate change effects on Antarctic glaciers

As glaciers in Antarctica have melted, previously ice-entombed black mosses have been exposed. A team led by University of Hawaiʻi at Mānoa researchers conducted extensive analyses on these mosses discovered in the northern Antarctic Peninsula, which revealed sensitive glacier behavioral responses to the climate over the past 1,500 years.

The findings, published in the Geological Society of America journal Geology, the top-ranked publication in the field of geological sciences, provide a clearer picture of climate and ice history in the region.

The principal investigator on the project is David W. Beilman, professor and undergraduate chair of the Department of Geography and Environment in UH Mānoa’s College of Social Sciences.

“The Antarctic Peninsula is a high-biodiversity coastal ecosystem that is one of the richest breeding grounds for penguins, seals and seabirds in the continent. What happens there has global impact including the influence of sea-level rise as ice melts,” said Beilman. “There are great scientific models of glacial expansion and recession, but much less is known about what happens on the ground at sea level where ice, ocean and sensitive coastal life intersect. Our field research addresses this gap and improves our understanding of these ecosystems and the changes resulting from polar warming.”

Studying ship tracks to inform climate intervention decision-makers

Sandia National Laboratories statistician Lyndsay Shand stands in front of a satellite image of ship tracks. Ship tracks are an unintentional example of one method to reflect some sunlight back to space before its heat is absorbed.
Photo Credit: Craig Fritz

Sandia scientists develop computer tools to study inadvertent marine cloud brightening

To understand how these ship tracks move and dissipate, the scientists created a mathematical model of ship tracks and how long they last, which they shared in a paper recently published in the scientific journal Environmental Data Science.

“Ship exhaust is an example of aerosol injections into the lower atmosphere, impacting the local environment, and is a daily occurrence,” said Lyndsay Shand, a Sandia statistician and the project lead. “We’ve been developing analytical tools to understand exhaust impacts on clouds from observational data collected by satellites. For example, we can locate a newly formed ship track and follow its evolution to better understand how it affects the local marine environment over time. We have found ship tracks to persist for more than 24 hours, longer than previously documented.”

Geckos know their own odor

Objects of the study of the researchers of the University of Bern were Tokay geckos (Gekko gecko).
Photo Credit: © Francesca Angiolani

Geckos can use their tongue to differentiate their own odor from that of other members of their species, as researchers from the University of Bern have shown in a new experimental study. The findings show that geckos are able to communicate socially, meaning that they are more intelligent than was previously assumed.

Self-recognition is the ability to detect stimuli which come from oneself. We as people, and also some animals, can identify ourselves visually when we look in the mirror. However, not all animals rely on their sense of sight, first and foremost. Geckos, and also other lizards and snakes, use their tongues to perceive chemicals, so-called pheromones, from other individuals. For instance, when climbing a wall, geckos pause every so often to dart their tongues around. This enables them to detect potential partners or rivals. But can geckos also detect their own odor and recognize themselves by smell?

In a study recently published in the journal Animal Cognition, researchers at the Institute of Ecology and Evolution of the University of Bern focused on whether Tokay geckos can detect skin chemicals that they themselves produce, and whether they can discriminate between these chemicals and those of other geckos of the same sex. The experiments confirmed that geckos are capable of this. During the tests, the animals were more interested in the skin chemicals of other geckos than in their own. This shows that geckos use pheromones for social communication.

New technology revolutionizes the analysis of old ice

The oldest ice in the world is being drilled for here as part of the European “Beyond EPICA – Oldest Ice” project: the camp at Little Dome C in Antarctica.
Photo Credit: © PNRA/IPEV

Ice cores are a unique climate archive. Thanks to a new method developed by researchers at the University of Bern and Empa, greenhouse gas concentrations in 1.5-million-year-old ice can be measured even more accurately. The EU project “Beyond EPICA” with the participation of the University of Bern aims to recover such old ice in Antarctica.

The search for the oldest ice on earth has taken an important step forward. The Beyond EPICA – Oldest Ice project, a European consortium that includes the University of Bern, completed its second field season at the end of January. The drilling reached a depth of 808 meters. The project objective is to look back 1.5 million years into the past and obtain data on the development of temperature, the composition of the atmosphere and the carbon cycle. A depth of around 2700 meters must be reached in the Antarctic ice sheet and an ice core recovered. If everything goes as planned, this should be the case in 2025. Only then will the complex analysis of the oldest ice in this core follow, which new methods are currently being developed for.

Climate Change Could Cause Mass Exodus of Tropical Plankton

Plankton under a microscope. Researchers at UT Austin say that tropical plankton like this may vanish as the climate warms.
Photo Credit: Tracy Aze.

The tropical oceans are home to the most diverse plankton populations on Earth, where they form the base of marine food chains. Modern plankton biodiversity in the tropics is a surprisingly recent development and the result of 8 million years of global cooling, according to a study led by researchers at The University of Texas at Austin.

The finding raises concerns that rapid ocean warming could force the plankton to move away from the tropics, which would negatively affect ocean ecosystems, including those of important fish such as tuna and billfish, and coastal communities that depend on them. The research was published in the journal Nature.

Using microfossils to track the history of a group of zooplankton called Foraminifera, the researchers found that the last time Earth was this warm – just before global cooling began 8 million years ago – tropical plankton populations lived in waters more than 2,000 miles from where they are today. The natural cooling of the past 8 million years that allowed the plankton to flourish in the tropics has been reversed by climate change during the past century.

Irreversible loss of ice sheets imminent past 1.8°C warming

Greenland ice sheet from about 40,000 feet elevation.
Photo Credit: NASA

Irreversible loss of the West Antarctic and Greenland ice sheets, and a corresponding rapid acceleration of sea-level rise, may be imminent if global temperature change cannot be stabilized below 1.8°C, compared to preindustrial levels. That finding was published in Nature Communications by an international team of scientists, including Fabian Schloesser, researcher at the University of Hawaiʻi at Mānoa School of Ocean and Earth Science and Technology.

The team of climate researchers found that an ice sheet/sea level run-away effect can be prevented only if the world reaches net zero carbon emissions before 2060.

Melting ice sheets are potentially the largest contributor to sea-level change, and historically the hardest to predict because the physics governing their behavior is notoriously complex.

“The model used in our study captures for the first time the coupling between ice sheets, icebergs, ocean and atmosphere, which is important for improving future sea-level projections and understanding of the underlying processes,” said Schloesser.

Urban birds prefer native trees

Urban great tits prefer native trees for breeding
Photo Credit: Sandra Alekseeva

Small passerine birds, such as blue and great tits, avoid breeding in urban areas where there are many non-native trees. Chicks also weigh less the more non-native trees there are in the vicinity of the nest. This is shown in a long-term study from Lund University in Sweden.

City trees contribute to several important ecosystem services such as lowering local temperature and purifying air but are also homes to birds and insects. Vegetation, especially trees, is the primary managed biological component of a city’s ecosystem. It is therefore important to understand the consequences of our planning of parks and green spaces. To find out how different types of trees affect birdlife, a research team, led by Lund University, monitored 400 nest boxes in five parks in the Swedish city Malmö over a seven-year period.

The results, now published in the scientific journal, Oecologia, show that native trees – defined in the study as species that have been in the ecosystem for at least 700 years – provide more resources and are preferred by urban birds.

New damselfly sharing habitat with UK natives

A male small red-eyed damselfly.
Photo Credit Pam Taylor

A damselfly species that came to the UK from Europe poses a minimal risk to native damselflies and dragonflies; new research shows.

As tens of thousands of species shift their “range” (the areas they live in) due to climate change, the small red-eyed damselfly has spread northwards from the Mediterranean. It was first observed in the UK in 1999 and has since established itself.

The new study – by the University of Exeter and the UK Centre for Ecology & Hydrology – used data from the British Dragonfly Society to see if it had caused native damselflies and dragonflies to decline.

The results showed most native dragonflies and damselflies were either found more often or were unchanged in areas colonized by the small red-eyed damselfly.

However, two damselfly species might have been negatively affected, and more research is needed to investigate this.

“With range-shifting increasing globally, we need to understand what impact newly arrived species have on ecosystems,” said Dr Regan Early, of the Centre for Ecology and Conservation on Exeter's Penryn Campus in Cornwall.

Deep-sea black carbon comes from hydrothermal vents

Research Vessel Hakuho Maru conducted the observations used for this study.
Photo Credit: Courtesy of Hokkaido University

Hydrothermal vents have been identified as a previously undiscovered source of dissolved black carbon in the oceans, furthering the understanding of the role of oceans as a carbon sink.

The ocean is one of the largest dynamic carbon sinks in the world, and is susceptible to increased carbon emissions from human activities. There are even proposals to use the ocean to sequester carbon in an effort to reduce carbon emissions. However, much of the processes by which the ocean functions as a carbon sink are not fully understood.

Associate Professor Youhei Yamashita and grad student Yutaro Mori at Hokkaido University, along with Professor Hiroshi Ogawa at AORI, The University of Tokyo, have revealed conclusive evidence that hydrothermal vents are a previously unknown source of dissolved black carbon in the deep ocean. Their discoveries were published in the journal Science Advances.

“One of the largest carbon pools on the Earth’s surface is the dissolved organic carbon in the ocean,” explains Ogawa. “We were interested in a portion of this pool, known as dissolved black carbon (DBC), which cannot be utilized by organisms. The source of DBC in the deep sea was unknown, although hydrothermal vents were suspected to be involved.”

Yellow evolution: Unique genes led to new species of monkeyflower

 Plants of the genus Mimulus (Monkeyflowers) have a great diversity of flower color and shape.
Photo Credit: Yuan Mimulus Lab, Pete Morenus | UConn

Monkeyflowers glow in a rich assortment of colors, from yellow to pink to deep red-orange. But about 5 million years ago, some of them lost their yellow. In the Feb. 10 issue of Science, UConn botanists explain what happened genetically to jettison the yellow pigment, and the implications for the evolution of species.

Monkeyflowers are famous for growing in harsh, mineral-rich soils where other plants can’t. They are also famously diverse in shape and color. And monkeyflowers provide a textbook example of how a single-gene change can make a new species. In this case, a monkeyflower species lost the yellow pigments in the petals but gained pink about 5 million years ago, attracting bees for pollination. Later, a descendent species accumulated mutations in a gene called YUP that recovered the yellow pigments and led to production of red flowers. The species stopped attracting bees. Instead, hummingbirds pollinated it, isolating the red flowers genetically and creating a new species.

UConn botanist Yaowu Yuan and postdoctoral researcher Mei Liang (currently a professor at South China Agricultural University), with collaborators from four other institutes, have now shown exactly which gene it is that changed to prevent monkeyflowers from making yellow. Their research, published this week in Science, adds weight to a theory that new genes create phenotypic diversity and even new species.

Size of insects are shaped by temperature and predators

Many bird species in the tropics catch and eat damselflies and dragonflies. Here is a Rufous-tailed Jacamar that has caught a large dragonfly in the Atlantic Forest of Brazil
Photo Credit: Erik Svensson

The size of dragonflies and damselflies varies around the globe. These insects are generally larger in temperate areas than in the tropics. According to a new study from Lund University in Sweden, this is caused by a combination of temperatures and the prevalence of predators.

In a large global comparative study of this ancient order of insects, researchers have studied how body size varies geographically and between different species. They compared the size of these insects in the hot tropics with the cooler, temperate regions to quantify geographical variation and understand its causes. This was done by analyzing size data and fossil data for various species of dragonflies and damselflies (two suborders of the order Odonata).

“Two hundred million years ago, these insects were larger in the tropics than in temperate climates. That trend has since reversed, however, and the opposite is now true, with larger species generally found at our northerly latitudes. We believe that this is partly caused by the evolutionary appearance of birds” says Erik Svensson, biologist at Lund University.

New models shed light on life’s origin

Rochester researcher Dustin Trail used experiments and zircon chemistry to build more accurate computer models of fluids that act as pathways from inner Earth to Earth’s surface. The models allow researchers to simulate what metals—such as manganese (pictured)—may have been transported to Earth’s surface when life first emerged, about four billion years ago. “Our research shows that metals like manganese may function as important links between the ‘solid’ Earth and emerging biological systems at Earth’s surface,” Trail says
Photo Credit: Vanderlei Alves da Silva

The research reveals clues about the physical and chemical characteristics of Earth when life is thought to have emerged.

The first signs of life emerged on Earth in the form of microbes about four billion years ago. While scientists are still determining exactly when and how these microbes appeared, it’s clear that the emergence of life is intricately intertwined with the chemical and physical characteristics of early Earth.

“It is reasonable to suspect that life could have started differently—or not at all—if the early chemical characteristics of our planet were different,” says Dustin Trail, an associate professor of earth and environmental sciences at the University of Rochester.

But what was Earth like billions of years ago, and what characteristics may have helped life to form? In a paper published in Science, Trail and Thomas McCollom, a research associate at the University of Colorado Boulder, reveal key information in the quest to find out. The research has important implications not only for discovering the origins of life but also in the search for life on other planets.

Doubling protected lands for biodiversity could require tradeoffs with other land uses

Scientists show how 30% protected land targets may not safeguard biodiversity hotspots and may negatively affect other sectors – and how data and analysis can support effective conservation and land use planning
Photo Credit: Federico Respini

Although more than half the world’s countries have committed to protecting at least 30% of land and oceans by 2030 in support of biodiversity, various questions emerge: Where and what type of land should be protected? How will new land protections impact carbon emissions and climate change, or the land needed for energy and food production? As a result, many decision makers are left questioning how to take action around protecting new land as they set their sights on achieving ambitious targets to preserve biodiversity in regions around the globe. New science tools can shed light on some of those questions.

A recent study led by climate scientists from the Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) aims to inform the discussion around how protecting additional land to meet conservation goals may impact land use (such as agricultural) and land cover (such as grass, water, or vegetation). The research is among the first to explore how potential pathways to achieve these bold targets affect agricultural expansion, and its findings suggest that meeting the 30% protection targets could lead to substantial regional shifts in land use and in some cases still fail to protect the world’s most biodiverse hotspots.

“It is important that we protect land if we want to stem additional ecosystem degradation,” said the paper’s lead author Alan Di Vittorio, a research scientist in Berkeley Lab’s Earth and Environmental Sciences Area. “But protecting land entails tradeoffs with other land uses and could have negative impacts on the agricultural sector, such as less land for bioenergy crops or less forest land for timber.”

How Giants Became Dwarfs

A nest of empty snail shells with the giant territorial nest owner (right), a female just entering a shell (middle) and a parasitic dwarf male (left). The striped fish in the foreground are egg predators.
Photo Credit: © Sabine Wirtz-Ocana

In certain Lake Tanganyika cichlids breeding in empty snail shells, there are two extreme sizes of males: giants and dwarfs. Researchers from the University of Bern and the University of Graz have analyzed the genomes of these fish and found out how the peculiar sizes of males and females evolved in conjunction with the genetic sex determination mechanism.

Difference in body size (or sexual dimorphism) between males and females is common across the animal kingdom. One of the most extreme examples of sexual dimorphism is found in the cichlid fish species Lamprologous callipterus from Lake Tanganyika in East Africa, where males are 12 times bigger (heavier) than females. The ecological reason for this remarkable size difference is the fact that this species uses empty snail shells found at the bottom of the lake to build nests. Hence males must be large enough to carry shells with their mouths, whereas females need to be small enough to fit inside the snail shells to lay eggs, where they are well protected from predators. Sex-specific differences in body size are important for the biology of this species, as small males would not be able to carry empty snail shells and large females would not be able to enter the shells for breeding.

Decades-old crustaceans coaxed from lake mud give up genetic secrets revealing evolution in action

 An ancient Daphnia pulicaria individual resurrected from South Center Lake (Minnesota, USA). This individual was hatched from an egg recovered from sediments that date back to circa 1418-1301 A. D. OU scientists have recently studied other members of this species to understand rapid evolution to human-caused pollution in lake ecosystems.
Image Credit: Dagmar Frisch

Human actions are changing the environment at an unprecedented rate. Plant and animal populations must try to keep up with these human-accelerated changes, often by trying to rapidly evolve tolerance to changing conditions.

University of Oklahoma researchers Lawrence Weider, professor of biology, and Matthew Wersebe, a biology doctoral candidate, demonstrated rapid evolution in action by sequencing the genomes of a population of Daphnia pulicaria, an aquatic crustacean, from a polluted lake.  

The research, which was conducted as part of Wersebe’s doctoral dissertation, was recently published in the Proceedings of the National Academy of Sciences.  Wersebe and Weider revived decades-old Daphnia resting eggs from lake sediments, a method known as resurrection ecology, which has been refined in Weider’s lab over the past several decades. They then sequenced the entire genomes of 54 different Daphnia individuals from different points-in-time, allowing them to study the genetics and evolution of the population.