Posts tagged space
CU Boulder researchers: You think it’s cold now?
Dec 5th
DEEP FREEZES, SAYS CU-BOULDER STUDY
Two University of Colorado Boulder researchers who have adapted a three-dimensional, general circulation model of Earth’s climate to a time some 2.8 billion years ago when the sun was significantly fainter than present think the planet may have been more prone to catastrophic glaciation than previously believed.
The new 3-D model of the Archean Eon on Earth that lasted from about 3.8 billion years to 2.5 billion years ago, incorporates interactions between the atmosphere, ocean, land, ice and hydrological cycles, said CU-Boulder doctoral student Eric Wolf of the atmospheric and oceanic sciences department. Wolf has been using the new climate model — which is based on the Community Earth System Model maintained by the National Center for Atmospheric Research in Boulder — in part to solve the “faint young sun paradox” that occurred several billion years ago when the sun’s output was only 70 to 80 percent of that today but when geologic evidence shows the climate was as warm or warmer than now..
In the past, scientists have used several types of one-dimensional climate models — none of which included clouds or dynamic sea ice — in an attempt to understand the conditions on early Earth that kept it warm and hospitable for primitive life forms. But the 1-D model most commonly used by scientists fixes Earth’s sea ice extent at one specific level through time despite periodic temperature fluctuations on the planet, said Wolf.
“The inclusion of dynamic sea ice makes it harder to keep the early Earth warm in our 3-D model,” Wolf said. “Stable, global mean temperatures below 55 degrees Fahrenheit are not possible, as the system will slowly succumb to expanding sea ice and cooling temperatures. As sea ice expands, the planet surface becomes highly reflective and less solar energy is absorbed, temperatures cool, and sea ice continues to expand.”
Wolf and CU-Boulder Professor Brian Toon are continuing to search for the heating mechanism that apparently kept Earth warm and habitable back then, as evidenced by liquid oceans and primordial life forms. While their calculations show an atmosphere containing 6 percent carbon dioxide could have done the trick by keeping the mean temperatures at 57 degrees F, geological evidence from ancient soils on early Earth indicate such high concentrations of CO2 were not present at the time.
The CU-Boulder researchers are now looking at cloud composition and formation, the hydrological cycle, movements of continental masses over time and heat transport through Earth’s system as other possible modes of keeping early Earth warm enough for liquid water to exist. Wolf gave a presentation on the subject at the annual American Geophysical Union meeting held Dec. 5-9 in San Francisco.
Toon said 1-D models essentially balance the amount of sunshine reaching the atmosphere, clouds, and Earth’s terrestrial and aquatic surfaces with the amount of “earthshine” being emitted back into the atmosphere, clouds, and space, primarily in the infrared portion of the electromagnetic spectrum. “The advantage of a 3-D model is that the transport of energy across the planet and changes in all the components of the climate system can be considered in addition to the basic planetary energy balance.”
In the new 3-D model, preventing a planet-wide glaciation requires about three times more CO2 than predicted by the 1-D models, said Wolf. For all warm climate scenarios generated by the 3-D model, Earth’s mean temperature about 2.8 billion years ago was 5 to 10 degrees F warmer than the 1-D model, given the same abundance of greenhouse gases. “Nonetheless, the 3-D model indicates a roughly 55 degrees F mean temperature was still low enough to trigger a slide by early Earth into a runaway glacial event, causing what some scientists call a ‘Snowball Earth,’” said Wolf.
“The ultimate point of this study is to determine what Earth was like around the time that life arose and during the first half of the planet’s history,” said Toon. “It would have been shrouded by a reddish haze that would have been difficult to see through, and the ocean probably was a greenish color caused by dissolved iron in the oceans. It wasn’t a blue planet by any means.” By the end of the Archean Eon some 2.5 billion year ago, oxygen levels rose quickly, creating an explosion of new life on the planet, he said.
Testing the new 3-D model has required huge amounts of supercomputer computation time, said Toon, who also is affiliated with CU-Boulder’s Laboratory for Atmospheric and Space Physics. A single calculation for the study run on CU-Boulder’s powerful new Janus supercomputer can take up to three months.
The CU-Boulder study was funded by a NASA Earth and Space Science Fellowship to Wolf as well as a grant from the NASA Exobiology and Evolutionary Biology Program.
Toon will be presented with AGU’s Roger Revelle Medal for innovative work on the effects of aerosols on clouds and climate at the 2011 San Francisco meeting. The Revelle Medal is presented annually to a scientist who has shown outstanding accomplishments or contributions toward the understanding Earth’s climate systems
Susan Melching Skin Care
Dec 2nd
Susan Melching, an innovative business woman since 1982, was the first aesthetician in the U.S to use microdermabrasion, a revolutionary technique in skin resurfacing. In 1995 she earned the coveted CIDESCO diploma, the highest credential for aesthetics in the world, certifying her to practice in over 30 countries.
Internationally trained as an aesthetician, electrologist, and permanent makeup artist, Susan is a dedicated skin care practitioner, committed to bringing the newest, most advanced systems of skin care analysis, treatments, and products to Boulder. With her sincerity, expertise, and gentle down to earth nature, Susan has created a safe, sacred space for you to be nurtured and educated on the health and care of your skin.
Susan Melching Skin Care Professionals
2449 Pine Street
Boulder, CO 80302
Phone: (303) 442-7921
Fax: (303) 442-7885
CU’s Will Vill North is better than gold
Dec 2nd
PLATINUM RATING IN LEED CERTIFICATION
Williams Village North, the University of Colorado Boulder’s newest residence hall, has received a LEED platinum rating from the United States Green Building Council. The 500-bed residence hall is the first of its size in the nation to rank platinum — the highest possible designation.
LEED certification is a U.S. benchmark for sustainable building design, construction, operation and maintenance. The $46.5 million Williams Village North, with 131,246 gross square feet, is projected to be nearly 40 percent more energy and water efficient than modern code-compliant buildings of the same size.
“Our platinum rating — a first for the campus — represents a lot and we’re very proud of what we’ve accomplished through the efforts of many dedicated people,” said Moe Tabrizi, campus sustainability director. “It reflects our commitments to immediate energy, water and resource conservation and our long-term goal of carbon neutrality, as well as the belief that we can provide students interactive learning in every corner of campus.”.
CU-Boulder has eight other structures that are LEED gold rated and another with a silver designation. All future new or renovated buildings on campus will be at least LEED gold rated, with the goal of seeking LEED platinum whenever possible, Tabrizi said.
In a building that gets 12.5 percent of its energy from on-site solar panels, Williams Village North residents have a hand in controlling the flow of electricity. They are able to shut off power to nonessential and not-in-use outlets with single switches installed in each room. Residents will be able to monitor electricity using meters and information kiosks in the building, which also are slated for upcoming energy savings competitions.
A free water bottle filling station shows how many plastic containers may have been diverted from landfills as users stock reusable vessels. Since the building opened in mid-August, the estimated savings stands at more than 24,000 bottles.
The building is home to two Residential Academic Programs, or RAPS — Sustainable by Design and Social Entrepreneurship for Equitable Development and Sustainability. Architecture Assistant Professor Matthew Jelacic serves as faculty in residence for both of the RAPS.
“Williams Village North offers more than a living space, it offers a lifestyle,” said Kambiz Khalili, executive director of Housing and Dining Services. “Our partnership with the campus and resident student leaders provided the opportunity to commit resources that allow CU students to fully explore the impacts of sustainability in a unique living and learning environment.”
The site has low-flow water fixtures installed in sinks, showers and toilets, and native landscaping that requires little or no watering.
Other green features include energy-efficient lighting with daylight harvesting, advanced heat-recovery systems and low-volatile organic compound, or VOC, materials.
“As we began the design process, it became obvious to us that if we stretched our collaborative efforts we had a chance to create the first LEED platinum building on campus,” said Curt Huetson, director of facilities, planning and operations for Housing and Dining Services. “I challenged our project team, which actually signed a pact and committed to make it happen. As a result, each member now points to this facility with tremendous personal pride.”
Team members included Paul Leef, director of planning, design and construction and campus architect; Steve Hecht, manager of design and project management; Heidi Rogé, project manager; Tom Goodhew, campus planner; Richelle Reilly, landscape architect; and Paula Bland, director of Residence Life. Also included were campus engineers Jonathan Akins, Pieter van der Mersch, Pepper Clayton and Joe Branchaw.
Only 1.5 percent of Williams Village North project costs came from the sustainability integration that makes the building LEED platinum rated and will translate into significant utility savings over time.
For more information on CU-Boulder’s green campus initiatives visit http://www.colorado.edu/cusustainability/greeningcu/GreeningCU.html. For more information on Housing and Dining Services visit http://housing.colorado.edu/