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Highlights include enriched and related content of notable journal articles presented on Eos org AGU org AGU On Demand and in AGU journals

Earth’s Carbon-Climate Feedbacks Varied in Past Warming Episodes

Terri Cook, Freelance Writer

From Eos.org: Research Spotlights— Records from drill holes in the eastern equatorial Pacific indicate that Earth’s orbital eccentricity played an important role in controlling climate as the planet warmed. Embedded within the Earth’s long-term cooling trend over the past 65 million years are several.... more

Ancient Ocean Floor Seashells Improve Model of Past Glaciers

Emily Underwood, Freelance Writer

More accurate reconstruction of ice sheets over the past 150,000 years could help scientists predict future climate change. Every 100,000 years or so over the past million years, relatively small changes in the amount of sunlight that reaches the Arctic region in summer have spurred dramatic shifts.... more

Corals Reveal Ancient Ocean Temperatures in Great Barrier Reef

Sarah Stanley, Freelance Writer

From Eos.org: Research Spotlights—  Old coral colonies suggest that a prehistoric warming event called the mid-Holocene Thermal Maximum may have occurred earlier than previously thought. As rising ocean temperatures bleach corals in the Great Barrier Reef, scientists seek better insight into climate.... more

Simulating the Climate 145 Million Years Ago

Shannon Hall, Freelance Writer

A new model shows that the intertropical convergence zone wasn't always a single band around the equator, which had drastic effects on climate. The United Kingdom was once a lush oasis. That can be read from sediments within the Kimmeridge Clay Formation, which were deposited around 160 to 145 million.... more

Reconstructing the Ocean’s Murky Past

Sarah Stanley, Freelance Writer

For decades, scientists have used the fossilized shells of foraminifera to help them explore the ocean's past. Proportions of different elements and isotopes in the shells give a rough snapshot of ocean conditions at the time the shells lived on the seafloor and were buried in sediment. However, foraminifera.... more

Isotopes in ancient corals offer a record of past ocean variability

Shannon Palus

Ancient corals off the coast of New England, collected a kilometer or two underwater, reveal that rapid shifts in ocean circulation occurred as glaciers receded and the planet moved out of the last ice age. Wilson et al. determined this information using neodymium (Nd) isotopes measured in samples of.... more

Peruvian Andes helped to cool eastern equatorial Pacific

During the latter half of the Cenozoic, starting during the Pliocene, the eastern equatorial Pacific (EEP) underwent a change from warm, wet climate conditions—which scientists refer to as “permanent El Niño”—to more moderate conditions like those observed today. Although scientists can track this change.... more

New high-resolution record of middle to late Miocene climate evolution

After the fairly warm Miocene climate optimum about 17–15 million years ago, Earth’s climate began to cool. Holbourn et al. present a new high-resolution record of climate evolution over the middle to late Miocene from 12.9 to 8.4 million years ago based on stable isotopes in sedimentary benthic foraminifera.... more

A selective approach to draw data from altered foraminifera shells

A sudden surge in the concentration of carbon dioxide in the air and the ocean 56 million years ago may have triggered the Paleocene-Eocene thermal maximum (PETM), a period of rapid and dramatic warming. In conjunction with the rising atmospheric temperature, ocean acidification significantly increased.... more

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