A meteor weighing 10,000 metric tons exploded 14 miles above Chelyabinsk, Russia, on Feb. 15, 2013. Unlike similar past events, this time scientists had the sensitive instruments on the Suomi NPP satellite to deliver unprecedented data and help them track and study the meteor plume for months.
A recent arrival to NASA’s Kennedy Space Center in Florida, the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft will have quite a different approach than that taken by recent probes dispatched to the Red Planet. Instead of rolling about on the surface looking for clues to the planet's hidden heritage, MAVEN will orbit high above the surface so it can sample the upper atmosphere for signs of what changed over the eons and why.
Cutting the amount of short-lived, climate-warming emissions such as soot and methane in our skies won't limit global warming as much as previous studies have suggested, a new analysis shows. The study also found a comprehensive climate policy (including methane) would produce more climate benefits by 2050 than if soot and methane were reduced alone.
Hot, dry and windy weather played a major role in recent destructive wildfires, and fire scientists have observed those conditions becoming more prevalent across the United States. For more than a decade, instruments on Terra and Aqua, two of NASA’s flagship Earth-observing satellites, have scanned the surface of our planet for fires and have had a major impact on what scientists know about fire’s role on Earth.
A multi-year airborne survey of atmospheric chemistry has revealed that the range of seasonal carbon dioxide, which plants take up in spring and summer and release in fall and winter, is expanding as more is added to Earth's atmosphere. According to scientists who conducted the study, northern hemisphere land-based ecosystems are "taking deeper breaths.”
Coastal waters off California are getting more acidic. Fall-run chinook salmon populations to the Sacramento River are on the decline. Conifer forests on the lower slopes of the Sierra Nevada have moved to higher elevations over the past half century. That's just a snapshot of how climate change is affecting California's natural resources, a report released Thursday found.
A new massive federal study says the world in 2012 sweltered with continued signs of climate change. Rising sea levels, snowmelt, heat buildup in the oceans, and melting Arctic sea ice and Greenland ice sheets, all broke or nearly broke records, but temperatures only sneaked into the top 10.
The Severe Storm Sentinel, or HS3, mission will fly this year to investigate Atlantic Ocean hurricanes. It will carry a new type of dual-frequency conical-scanning Doppler radar that sports a new shape: Most aircraft carrying Doppler radar look like they’ve grown a tail, developed a dorsal fin, or sprouted a giant pancake on their backs. But the unmanned Global Hawk carries will carry the radar under its belly as it flies above hurricanes.
Climate change alters the way in which species interact with one another—a reality that applies not just to today or to the future, but also to the past, according to a recent study which analyzed information about past episodes of rapid climate change from Earth's history. The researchers hope to use this finding to help predict future changes to our planet's ecosystems.
With the “green” reputation of large hydroelectric dams already in question, scientists are reporting that millions of smaller dams on rivers around the world make an important contribution to the greenhouse gases linked to global climate change. Their study shows that more methane than previously believed bubbles out of the water behind small dams.
In the runaway greenhouse stage, a planet absorbs more solar energy than it can give off to retain equilibrium. As a result, the world overheats, boiling its oceans and filling its atmosphere with steam, which leaves the planet glowing-hot and forever uninhabitable, as Venus is now. Recent research shows this scenario might be more easily reached than previously thought.
The ionosphere, one of the regions of the upper atmosphere, plays an important role in global communications. Now, researchers have discovered that the radio waves reflecting back to Earth from the ionosphere offer valuable news on climate change as well.
Researchers have for the first time mapped the above ground carbon density of an entire country in high fidelity. They integrated field data with satellite imagery and high-resolution airborne LiDAR data to map the vegetation and to quantify carbon stocks throughout the Republic of Panama. Carbon stocks are now reported locally in areas as small as a hectare (2.5 acres).
The measurements by the most advanced spacecraft to land on the red planet closely match what the twin Viking landers detected in the late 1970s and what scientists have gleaned from Martian meteorites. Mars' atmosphere is overwhelmingly dominated by carbon dioxide, unlike Earth's air, which is a mix of nitrogen and oxygen. But Curiosity’s measurements did yield one small surprise.
New findings from NASA's Curiosity rover provide clues to how Mars lost its original atmosphere, which scientists believe was much thicker than the one left today. The beauty of these measurements lies in the fact that these are the first really high-precision measurements of the composition of Mars' atmosphere.
Three weeks after giving an ambitious speech to outline his climate change proposal, President Obama begins the arduous task of executing it. His plan is a complicated mix of rulemaking and federal permitting that's tough to encapsulate in a neat sales pitch—and may be even tougher to put into action.
By pinpointing locations on Earth from space, GPS systems have long shown drivers the shortest route home and guided airline pilots across oceans. Now, by figuring out how messed up GPS satellite signals get when bouncing around in a storm, researchers have found a way to do something completely different with GPS: measure and map the wind speeds of hurricanes.
The length of the satellite record for the Greenland and Antarctic ice sheets is currently too short to tell if the recently reported speed-up of ice loss will be sustained in the future or if it results from natural processes, according to a new study. Sheets are losing are about 300 billion tons of ice each year, but no consensus has emerged about the cause of this recent increase in mass loss.
Despite warnings to the contrary, many people continue to operate portable generators indoors or close to open windows, resulting in more than 500 deaths since 2005. And each year, more than 20,000 people visit the emergency room and more than 4,000 are hospitalized due to exposure to toxic levels of carbon monoxide. A new computer modeling study scrutinizes the deadly relationship between carbon monoxide emissions and occupant exposure.
Studies have long predicted that plants would begin to use water more efficiently, that is, lose less water during photosynthesis, as atmospheric carbon dioxide levels rose. However, an international research team doing work at the Harvard Forest Long-Term Ecological Research site has found that forests across the globe are losing less water than expected and becoming even more efficient at using it for growth.
A new study links heavy air pollution from coal burning to shorter lives in northern China. Researchers estimate that the half-billion people alive there in the 1990s will live an average of 5½ years less than their southern counterparts because they breathed dirtier air.
Univ. of Adelaide researchers have developed a new nanomaterial that could help reduce carbon dioxide emissions from coal-fired power stations. The new nanomaterial efficiently separates the greenhouse gas carbon dioxide from nitrogen, the other significant component of the waste gas released by coal-fired power stations. This would allow the carbon dioxide to be separated before being stored, rather than released to the atmosphere.
A new study has provided the first conclusive proof of the existence of a space wind first proposed theoretically over 20 years ago. By analyzing data from the European Space Agency’s Cluster spacecraft, researchers have the plasmaspheric wind, so-called because it contributes to the loss of material from the plasmasphere, a donut-shaped region extending above the Earth’s atmosphere.
There are a lot of small molecules people would like to convert to something useful. The current process for reducing nitrogen to ammonia is done under extreme conditions, and there is an enormous barrier to overcome to get a final product. Breaching that barrier more efficiently and reducing the huge amounts of energy used to convert nitrogen to ammonia has been a grail for the agricultural chemical industry, until now.
The energy people use to power their homes and to satisfy their mobility needs accounts for more than 70% of emissions of carbon dioxide, the main greenhouse gas involved in global climate change. Recent research suggests that energy conservation in a small number of households could go a long way to reducing greenhouse gas emissions.