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Why does sea level change at different rates? How has it changed in the past? Who will be at risk from more extreme weather and sea level rise in the future? Our scientists often hear questions like these. To help share the answers more widely, we created a new app that lets users explore a series of maps of the planet, from the deepest trenches in the oceans to the ice at the poles. You can see how ice, the oceans, precipitation and temperatures have changed over time and listen as scientists explain what you’re seeing and why.

As excess carbon dioxide is absorbed into the oceans, it is starting to have profound effects on marine life, from oysters to tiny snails at the base of the food chain.

Over the last century, glaciers in Greenland have been retreating quickly – at a rate at least twice as fast as any other time in the past 9,500 years, according to a new study. The study also provides new evidence for just how sensitive glaciers are to temperature changes, showing that they responded to abrupt and even short-lived cooling and warming in the past that lasted decades to centuries.

The fate of the ice sheets has a direct impact on populations worldwide: as the land-based ice melts, it raises sea level, and that can threaten coastal communities and economies.

A snapshot of the changing climate of the West Antarctica Peninsula, where the impact of fast-rising temperatures provides clues about future ecosystem changes elsewhere.

Rarely a day goes by without earthquakes shaking the Alaska Peninsula, a string of volcanoes curving off the Alaska mainland into the Pacific. Just off shore, two tectonic plates are converging: The Pacific plate is bending under the North American plate and pushing deep into the Earth. Along this subduction zone, scientists have noticed something unusual. Two adjacent sections that appear almost identical in large-scale characteristics—temperature, angle of subduction, age of the rocks—are exhibiting very different earthquake behaviors over short spans of just tens of kilometers. One section is highly active with small earthquakes; the other is more quiet but has large earthquakes every 50 to 75 years. To get a closer look, Lamont-Doherty Earth Observatory’s research ship, the R/V Marcus G. Langseth, ran seismic surveys to map the ocean floor and the earth beneath it.

Much of the modern understanding of climate change is underpinned by pioneering studies done at Columbia University’s Lamont-Doherty Earth Observatory. Starting in the 1950s and continuing today, researchers at sea, on land and in the lab have worked in disciplines including oceanography, atmospheric physics, magnetism, geochemistry, glacial geology, paleontology, tree-ring studies and more.

Hurricane Patricia intensified incredibly rapidly as it approached the Mexico coast on Oct. 23, exploding from a tropical storm with wind speeds of 63 mph to a Category 5 hurricane with wind speeds over 160 mph only 24 hours later, and it continued to strengthen, reaching 200 mph. While most of the models predicted strengthening, they all underestimated how quickly and how strong the wind speeds would become.

A new study in Science questions the provocative idea that climate change may shape the texture of the sea floor. Lamont's Jean-Arthur Olive and his co-authors argue that the fabric of the sea floor is better explained by faults that form, offsetting the crust as the plates pull apart. Their paper is the first to explain the characteristic spacing of abyssal hills quantitatively as a function of seafloor spreading rate within a single theoretical framework.

Nicolás Young was just named a winner of a 2015 Blavatnik Award for his work measuring ice sheets in changing climates of the past and their contribution to sea level rise. His new projects are taking glacier tracking to the next level.

A new study has found that powerful winds are removing massive amounts of snow from parts of Antarctica, potentially boosting estimates of how much the continent might contribute to sea level. Up to now, scientists had thought that most snow scoured from parts of the continent was simply redeposited elsewhere on the surface. However, the new study shows that in certain parts, called scour zones, some 90 percent—an estimated 80 billion tons per year—is instead being vaporized, and removed altogether. 

Scientists working off west Africa in the Cape Verde Islands have found evidence that the sudden collapse of a volcano there tens of thousands of years ago generated an ocean tsunami that dwarfed anything ever seen by humans. The researchers say an 800-foot wave engulfed an island more than 30 miles away. The study could revive a simmering controversy over whether sudden giant collapses present a realistic hazard today around volcanic islands, or even along more distant continental coasts. The study appears today in the journal Science Advances.

Most rainfall occurs in the tropics, where it is concentrated in a band circling the Earth near the equator (see Fig. 1). Understanding how this rain band and its local constituents, i.e. the monsoon systems over land and the intertropical convergence zone over the ocean, will respond to climate change is one of the most stubborn questions in climate science (Bony et al., 2015; Voigt and Shaw, 2015). It is also one that has important implications for climate adaption. For example, because the rain band is so localized, small changes in its position can lead to large local rainfall changes.

Over 40 years, the scientists of the internationally renowned Lamont Tree Ring Lab have hiked the continents in search of tree-ring records. They have documented droughts that stretched for hundreds of years, dated historic earthquakes and volcanic eruptions, and found in trees around the world evidence of how the planet cooled and then started warming. The Lab has expanded dendrochronology’s capabilities and becme a global leader in research, training and technology.
 

Even the simplest research questions can lead to far-reaching public benefits. Consider Chris Small and Joel Cohen’s study of global population by altitude, being honored this week with a Golden Goose Award at the Library of Congress.

Two solar farms will soon be powering 75 percent of Columbia University’s Lamont-Doherty Earth Observatory, whose high-tech laboratories are home to some of the world’s leading Earth and climate scientists. The new power sources are expected to cut the campus’s electricity bill by 20 percent and reduce its carbon dioxide emissions by half.

Geochemist Yaakov Weiss deals in diamonds. Not the brilliant jewelry-store kind, but the flawed, dirty-looking ones used more for industry than decoration. Gem-grade diamonds are generally pure crystallized carbon, but many lower-grade stones contain so-called inclusions–chemical intruders bottled up inside the crystal. Inclusions lower the stone’s value; but they contain worlds of information about the deep, inaccessible regions where diamonds come from. Their compositions speak to not only how diamonds form (and maybe how to find them), but other basic processes below. “They are the most pristine samples we can get from underlying depths,” says Weiss, who works at Columbia University’s Lamont-Doherty Earth Observatory. “After a diamond captures something, from that moment until millions of years later in my lab, that material stays the same. We can look at diamonds as time capsules, as messengers from a place we have no other way of seeing.” Some of his recent studies are providing new insights to these regions.

Trees can record centuries of history in their rings – changes in rainfall and temperatures, even evidence of fires sweeping through a region or the climatic impacts of volcanic eruptions. Annual rings are common in trees that experience seasonal climate variability and dormancy, but in the tropics, these records are rare. Now, for the first time, scientists have documented consistent annual tree rings in a native species on Hawai’i. The history recorded in the ring widths could improve our understanding of the climate in the eastern tropical Pacific,  a region where much of the variability of the El Niño-Southern Oscillation (ENSO) originates.

The New Jersey shoreline that sea birds wandered during the last ice age is about 90 miles east of today’s beaches, tens of meters beneath the sea floor. As the ice melted, sea level gradually rose and flooded the coastal terrain, and sedimentation carried out its relentless burial of things past.

This summer, a group of scientists spent several weeks aboard the R/V Marcus G. Langseth looking into that past. Using sound waves, they collected data that will be used to build 3D images of the sediment beneath the ocean floor. They hope to be able to peel back layers of the 3D images to see how coastal landscapes responded to rising sea levels and hurricanes through history.

If you’re ever lost in a marsh and need to build a battery that can power LED lights, these teens can help you out. They can show you how to track the flow of nutrients into and out of a marsh, and how to take sediment samples and analyze them for carbon, methane or metals. They can also show you how to rehabilitate a marsh that has been overrun by invasive species – they just spent the summer working with scientists at Lamont-Doherty Earth Observatory and Piermont Marsh putting all of these projects and their own hypotheses to the test.

The climate over the tropical Pacific is in an extreme state at the moment. That explains some of the extreme anomalies affecting the United States right now. It also gives us a window through which we can glimpse how even more dramatic and long-term climates of the distant past might have worked, and – in the most radical scenarios, unlikely but impossible to rule out entirely – how much more extreme future climate changes could occur.

International health experts have called it the largest mass poisoning in history, and it is still underway. Some 100 million people in southeast Asia have been drinking from shallow wells originally drilled to provide germ-free water; but many turned out to be contaminated with naturally occurring arsenic.

A new study of tree rings from Mongolia dating back more than 1,000 years confirms that recent warming in central Asia has no parallel in any known record. In recent decades, temperatures have been ascending more rapidly here than in much of the world, but scientists have lacked much evidence to put the trend into a long-term context. The study does not explicitly raise the issue of human-induced warming, but is sure to be seen as one more piece of evidence that it is at work. The study appears in the journal Quaternary Science Reviews.

H. James Simpson, a geochemist who pioneered important studies of water pollutants in the Hudson River and abroad, died May 10. He had been affiliated with Columbia University’s Lamont-Doherty Earth Observatory for 50 years. The cause was Parkinson’s disease, said his family; he was 72.

Since the late 1990s, global warming has stabilized, even as greenhouse gases have risen. That defies simple models that say the temperature should keep going up. Many scientists think the so-called “hiatus” is taking place in part because much of the heat trapped in the atmosphere by greenhouse gases is being soaked up and stored by the oceans–at least for now. The Pacific is believed to play an especially powerful role, with winds in its eastern regions sweeping heat into its depths, like dirt getting swept under the rug. The problem is, scientists checking under the rug by measuring subsurface temperatures have not necessarily found the predicted increases in heat. This has come to be known as the riddle of the “missing heat.” A team of oceanographers now says they know where it went: It has been exported from the Pacific to the Indian Ocean. Their study, out this week in the journal Nature Geoscience, finds that this movement may account for more than 70 percent of all heat absorbed by the entire upper world ocean in the past decade.

Phosphorus is an essential nutrient for every living organism, well known for its role in fueling everything from the human body to farm fields. But up to now, surprisingly little has been known about how the element cycles through the oceans. A new study has broken through some of this mystery, by showing the hidden role that the oceans’ tiniest creatures play. The study appears this week in the leading journal Science.

Columbia University’s Lamont-Doherty Earth Observatory has signed a $35 million, five-year cooperative agreement with the U.S. National Science Foundation (NSF) to manage scientific support services for U.S. scientists studying the world’s ocean floors. Lamont will use the award to manage U.S. scientific support services for the International Ocean Discovery Program (IODP), a 26-nation collaboration that explores earth’s geologic history and dynamics via the seafloors. The award, the result of a national competition conducted by NSF, was announced today at a press conference by Congresswoman Nita Lowey (D-Westchester/Rockland counties), and top Lamont staff.

Vast ranges of volcanoes hidden under the oceans are presumed by scientists to be the gentle giants of the planet, oozing lava at slow, steady rates along mid-ocean ridges. But a new study shows that they flare up on strikingly regular cycles, ranging from two weeks to 100,000 years—and, that they erupt almost exclusively during the first six months of each year. The pulses—apparently tied to short- and long-term changes in earth’s orbit, and to sea levels--may help trigger natural climate swings. Scientists have already speculated that volcanic cycles on land emitting large amounts of carbon dioxide might influence climate; but up to now there was no evidence from submarine volcanoes. The findings suggest that models of earth’s natural climate dynamics, and by extension human-influenced climate change, may have to be adjusted. The study appears this week in the journal Geophysical Research Letters.

Ice ages come and go. So do pulses of volcanic eruptions on land and at sea, maybe, on roughly the same time scale. Could the two be related? A recent two-week oceanographic expedition aimed to find out. The overarching hypothesis: As water accumulates on land in the form of massive ice sheets, the pressure of the overlying ice puts a lid on volcanoes. A corresponding drop in sea level allows volcanic vents on the seafloor to let loose. Then, when the planet warms, causing ice to melt and sea levels to rise, hydrothermal venting is suppressed, while volcanoes on land become more active.

In Portuguese, fogo means fire, and for hundreds of years, Fogo volcano in the Cape Verde islands off Senegal has lived up to its name. It has spouted off every 20 years or so, at least as far back as 1460 when the Portuguese settled here. Nearly 20 years after its last eruption, in 1995, Fogo awoke on the Sunday after Thanksgiving. Within a week, it had buried two villages high in Fogo’s caldera – Portela and Bangaeira – under lava, leaving 1,200 people homeless.

Once a year, Piermont Pier becomes a field station, and local students, a team of environmental investigators. On Tuesday, scientists at Lamont-Doherty Earth Observatory led students through a series of field experiments designed to teach them more about the Hudson River. The students took water chemistry measurements and compared them to the Hudson’s tidal cycles. They cored sediments from the river bottom and pictured their stretch of the Hudson covered in glaciers. They mapped out how high the river may rise under several CO2-emissions scenarios.

Max Cunningham, a graduate student at Lamont-Doherty, traveled to Costa Rica’s Mount Chirripó this past summer to test the idea that mountain glaciers carved the summit we see today. He and his colleagues hope to eventually pin down when Chirripó’s high-elevation valleys eroded into their current form. Check out a recap of their 2014 field season.

In a long running tradition known as Open House, Lamont-Doherty Earth Observatory opens its doors to the public. In talks and demonstrations, scientists share what they have been up to over the last year. Here is where to learn what makes some volcanoes more explosive than others; how deep ocean currents circulate the globe; what tree rings can tell us about climate change today and in times past. Researchers also share some of their tools for exploration, from unmanned robot submarines to portable seismometers to mass spectrometers that measure tiny bits of matter.

A new study by researchers at Lamont-Doherty Earth Observatory and Stony Brook University shows how ‘brown tide’ algae thrive in waters that are murky and low in inorganic nutrients.

Kenneth Hunkins, an oceanographer who made many key 20^th-century observations about the Arctic Ocean, often while camping for months on its frozen surface, died in his sleep at his home in Tappan, N.Y., on Sept. 2. He was 86. Columbia University’s Lamont-Doherty Earth Observatory, where he had spent his entire career, confirmed his death.

Death Valley is a land of extremes—among the hottest, driest and lowest points on earth. Why would anyone choose to spend spring break there?

“It just sounds very exotic,” says Nicholas Christie-Blick, a geology professor and research scientist at Columbia University’s Lamont-Doherty Earth Observatory. “It’s very far away from their personal experience.”

For decades, climate scientists have tried to explain why ice-age cycles became longer and more intense about 900,000 years ago, switching from 41,000-year cycles to 100,000-year cycles.  In a new study in the leading journal Science, researchers found that the deep ocean currents that move heat around the globe stalled or even stopped, possibly due to expanding ice cover in the north. The slowing currents increased carbon dioxide storage in the ocean, leaving less in the atmosphere, which kept temperatures cold and kicked the climate system into a new phase of colder but less frequent ice ages, they hypothesize.

Tiny one-celled organisms called radiolaria are ubiquitous in the oceans, but various species prefer distinct habitats. Thus it aroused considerable intrigue in 2012 when protozoa specialist O. Roger Anderson and colleagues published a study showing that radiolaria normally found near the equator were suddenly floating around in arctic waters above Norway. Was this a sign that global climate change was bringing an invasion of warm-weather plankton?

On a high ridge in Arizona’s Petrified Forest National Park, paleontologist Paul Olsen sits on the fallen trunk of a 215-million-year-old tree, now turned to stone. The tree once loomed 70 or 80 feet above a riverine landscape teeming with fish, turtles, giant crocodilians and tiny, early species of dinosaurs. From here, Olsen can survey the remnants of this lost world: miles and miles of surreal badlands, where sediments built up over millions of years have eroded back down to expose endless cross sections of brightly colored rocks. The layers represent tectonic movements, natural climate cycles, the growth and disappearance of lakes, buildups of river deltas. The petrified trees scattered across the landscape are only the most obvious fossils; others are bleeding out by the ton. It is perhaps the world’s richest trove of rocks from the late Triassic, when dinosaurs, and early mammals, got their evolutionary start. The Triassic was also a hothouse world: a time of high atmospheric carbon dioxide, rapid climate shifts, and fast-moving extinctions. Olsen thinks there may be much to learn from it for our own time.

As dates in geologic history go, the formation of the slender land bridge that joins South America and North America is a red-letter one. More than once over the past 100 million years, the two great landmasses have been separated by deep ocean waters. The narrow section of Central America that now unites them–at its narrowest along the isthmus of Panama–changed not just the world map, but the circulation of oceans, the course of biologic evolution, and probably global climate. The tortured product of diverse forces, today’s version of the isthmus was probably fashioned by volcanism and movements of tectonic plates somewhere between 15 million and 3 million years ago.

Gerardo Iturrino, a longtime engineer and ocean explorer at Lamont-Doherty Earth Observatory, passed away unexpectedly on March 12. A resident of nearby Nyack, he was 51; the cause was heart attack, said his family.

Researchers studying the rings of ancient trees in mountainous central Mongolia think they may have gotten at the mystery of how small bands of nomadic Mongol horsemen united to conquer much of the world within a span of decades, 800 years ago. The rise of the great leader Genghis Khan and the start of the largest contiguous empire in human history was propelled by a temporary run of nice weather.

On Feb. 20, Science published new research about the Pine Island Glacier on the West Antarctic Ice Sheet that suggests the glacier’s recent and rapid thinning and melting may continue for decades or centuries to come. The British Antarctic Survey’s Joanne Johnson’s research, done in collaboration with scientists at Lamont-Doherty, might not have been possible without Lamont’s effort to promote women scientists, honoring another woman scientist who helped map the ocean floor.

Terry Plank got hooked on volcanoes when her professor at Dartmouth took the students to Costa Rica and let them have lunch on Arenal, a famous volcano that was in the process of erupting. “They gave us each a pineapple and a can of tunafish and we had to figure out how to eat this stuff with our Swiss Army knives while sitting on a lava flow…It just looked like black rock, but every once in awhile a boulder at the end would fall off and you’d see it was completely red inside. And it made all these cool sounds and you’d feel these little earthquakes… It was totally cool. How could you not like that?”