Tag Archives: atmosphere

CU-led Mountain Forest Study Shows Vulnerability to Climate Change

By Guest PostSeptember 16, 2012Environmentalpine, anne kelly, Arctic, atmosphere, boulder, carbon dioxide, change, climate change, colorado, data, dry, energy, ernesto trujillo, flux towers, forest greenness, ground measurement, high resolution, michael golden, mid elevation, moisture change, mountain ecosystem, mountain range, noah molotch, precipitation, radiometer, rising temperature, roger bales, satellite image, sensitivity, sierra nevada, snowmelt, tipping point, united states, university, water vapor, western, wet, year

A new University of Colorado Boulder-led study that ties forest “greenness” in the western United States to fluctuating year-to-year snowpack indicates mid-elevation mountain ecosystems are most sensitive to rising temperatures and changes in precipitation and snowmelt.

Led by CU-Boulder researcher Ernesto Trujillo and Assistant Professor Noah Molotch, the study team used the data — including satellite images and ground measurements — to identify the threshold where mid-level forests sustained primarily by moisture change to higher-elevation forests sustained primarily by sunlight and temperature. Being able to identify this “tipping point” is important because it is in the mid-level forests — at altitudes from roughly 6,500 to 8,000 feet — where many people live and play in the West and which are associated with increasing wildfires, beetle outbreaks and increased tree mortality, said Molotch. (more…)

Airborne Technology Helps Manage Elephants

By Guest PostAugust 26, 2012Environment, Nature3 d mapping, africa, airborne technology, atmosphere, cao, carbon, carnegie, climate, danie pienaar, ecology letters, ecosystem, elephant, elephant conservation, elephant trap, Environment, greg asner, habitat, herbivore, kruger national park, lidar, management practice, savanna, sequester, shaun levick, South Africa, terrain condition, toppling tree, treefall, vegetation

Washington, D.C. – For years, scientists have debated how big a role elephants play in toppling trees in South African savannas. Tree loss is a natural process, but it is increasing in some regions, with cascading effects on the habitat for many other species. Using high resolution 3-D mapping, Carnegie scientists have for the first time quantitatively determined tree losses across savannas of Kruger National Park. They found that elephants are the primary agents—their browsing habits knock trees over at a rate averaging 6 times higher than in areas inaccessible to them. The research also found that elephants prefer toppling trees in the 16-to-30 foot (5-8 m) range, with annual losses of up to 20% in these height classes. The findings, published in Ecology Letters, bolster our understanding of elephant conservation needs and their impacts, and the results could help to improve savanna management practices.

“Previous field studies gave us important clues that elephants are a key driver of tree losses, but our airborne 3-D mapping approach was the only way to fully understand the impacts of elephants across a wide range of environmental conditions found in savannas,” commented lead author Greg Asner of Carnegie’s Department of Global Ecology. “Our maps show that elephants clearly toppled medium-sized trees, creating an “elephant trap” for the vegetation. These elephant-driven tree losses have a ripple effect across the ecosystem, including how much carbon is sequestered from the atmosphere.” (more…)

God as a Drug: The Rise of American Megachurches

By Guest PostAugust 25, 2012Culture, Generalamerican christians, american megachurche, atmosphere, charismatic leadership, charismatic pastor, christianity, denver, drug, emotional energy, evangelical revivalism, god, holy spirit, hybrid, james wellman, kate stockly meyerdirk, katie e corcoran, message, multisensory mélange, rise, ritual chains, rob bell, rock music, san diego megachurch, sense, sensory pageantry, spiritual growth, spirituality, stagecraft, stereotyped, university of washington, vision

American megachurches use stagecraft, sensory pageantry, charismatic leadership and an upbeat, unchallenging vision of Christianity to provide their congregants with a powerful emotional religious experience, according to research from the University of Washington.

“The megachurches movement is one of the leading indicators of how American Christians exercise their faith these days, so therefore they should be understood,” said James Wellman, associate professor of American religion at the University of Washington. “And our study shows they’re doing a pretty effective job for their members, based on self-reports, contrary to public opinion that tends to pass them off as a type of consumerist religion. In fact, their members speak eloquently of their spiritual growth.” (more…)

Mather Lecture

By Guest PostMay 14, 2012Environmentatmosphere, atmospheric moisture, biodiversity, charles j vörösmarty, China, climate change, computer model, cort willmott, deforestation, Europe, geospatial data, global water crisis, hydrology, India, industrializing place, john r mather, mather lecture, nancy targett, natural water systems, nitrogen pollution, noaa, river, sandra mather, stress, thermal regime, united states, university of delaware, water cycle, water management

Renowned expert Charles J. Vörösmarty addresses global water crisis

The world’s streams, rivers and lakes are under increasing stress because of human water management – and mismanagement – that threaten aquatic biodiversity and the water supply, Charles J. Vörösmarty said recently during the second annual John R. Mather Visiting Scholars Lecture.

Vörösmarty, professor of civil engineering with the City College of New York, presented “Global Water Crisis: The Slippery Slope” on May 3 at the University of Delaware’s Roselle Center for the Arts.

“The contemporary water system is really defined increasingly by the actions of humans,” he said. (more…)

NASA’s Spitzer Sees the Light of Alien ‘Super Earth’

By Guest PostMay 9, 2012Science55 cancri, 55 cancri e, atmosphere, bill danchi, gaseous planet, hot jupiter, jet propulsion laboratory, kelvin, michael gillon, michael werner, NASA, planet, signs of life, solar system, spitzer project, spitzer space telescope, super earth

PASADENA, Calif. – NASA’s Spitzer Space Telescope has detected light emanating from a “super-Earth” planet beyond our solar system for the first time. While the planet is not habitable, the detection is a historic step toward the eventual search for signs of life on other planets.

“Spitzer has amazed us yet again,” said Bill Danchi, Spitzer program scientist at NASA Headquarters in Washington. “The spacecraft is pioneering the study of atmospheres of distant planets and paving the way for NASA’s upcoming James Webb Space Telescope to apply a similar technique on potentially habitable planets.” (more…)

A NASA Weather ‘Eye in the Sky’ Marks 10 Years

By Guest PostMay 7, 2012Environment, Scienceairs, amsu a, atmosphere, atmospheric infrared sounder, bae systems, boston, carbon dioxide, climate change, climate research, earth, energy cycle, eric fetzer, eye, global water, greenhouse gases, hyperspectral sounding, instrument, jet propulsion laboratory, model, monster, moustafa chahine, NASA, sky, tom pagano, water vapor, weather forecasting, weather satellites

For 10 years, it has silently swooped through space in its orbital perch 438 miles (705 kilometers) above Earth, its nearly 2,400 spectral “eyes” peering into Earth’s atmosphere, watching. But there’s nothing alien about NASA’s Atmospheric Infrared Sounder, or AIRS, instrument, a “monster” of weather and climate research that celebrates its 10th birthday in orbit May 4.

AIRS, built by BAE Systems, Boston, under the direction of NASA’s Jet Propulsion Laboratory, Pasadena, Calif., is one of six instruments flying on NASA’s Aqua spacecraft as part of NASA’s Earth Observing System. AIRS, along with its partner microwave instrument, the Advanced Microwave Sounding Unit (AMSU-A), has faithfully measured our planet’s atmospheric temperature, water vapor, clouds and greenhouse gases with unprecedented accuracy and stability. Over the past decade, AIRS and AMSU-A have improved our understanding of Earth’s global water and energy cycles, climate change and trends and how Earth’s climate system is responding to increased greenhouse gases. (more…)

Cassini Finds Titan Lake is Like a Namibia Mudflat

By Guest PostApril 20, 2012Scienceatmosphere, bonnie buratti, cassini spacecraft, earth, ethane, etosha salt pan, geological feature, groundwater level, hydrocarbon cycle, lake, liquid hydrocarbon, methane, moon, mudflats, NASA, ontario lacus, propane, rainy season, saturated sand, saturn, south polar, thomas cornet, titan

A new study analyzing data from NASA’s Cassini spacecraft suggests that the lake, known as Ontario Lacus, behaves most similarly to what we call a salt pan on Earth.

A group led by Thomas Cornet of the Université de Nantes, France, a Cassini associate, found evidence for long-standing channels etched into the lake bed within the southern boundary of the depression. This suggests that Ontario Lacus, previously thought to be completely filled with liquid hydrocarbons, could actually be a depression that drains and refills from below, exposing liquid areas ringed by materials like saturated sand or mudflats. (more…)

Space Weather Forecast: Sunspotty, With an Increasing Chance of Solar Storms

By Guest PostApril 15, 2012Environmentatmosphere, coronal mass ejections, dark sky, earth, flagpole, fm broadcasts, forecast, frank lind, gps, john sahr, k p index, kuow, laura vertatschitsch, magnetic field, magnetosphere, mars, mary levin, mechanical energy, molecular plasma, northern light, satellites, seattle, sieg hall, solar flares, solar storms, source, space weather, sunspot cycle, sunspotty, transmitter, xray

The past few months have seen a spate of solar flares – bringing spectacular views of the northern lights as far south as Seattle – along with media speculation that the electrical activity could disrupt power grids, satellites or ground airplanes.

John Sahr, a UW professor of electrical engineering who studies the upper atmosphere, is the regional go-to guy for such questions. We found some time in Sahr’s busy schedule (he’s also the UW’s associate dean of undergraduate academic affairs and a part-time zombie hunter) to get his read on the space weather forecast. (more…)