Boulder Bikesmith
Feb 8th
As Boulder’s largest rental shop, the Bikesmith has a niche. Since they sell only used (vs. new) bikes, they don’t compete with Performance Bicycles, located in the same shopping center. Rather, their businesses complement one another. Often, a customer interested in purchasing a new bike from Performance will opt to ‘test ride’ the bike first, by renting it from the Bikesmith for a day or two. It also happens that the Bikesmith might buy someone’s used bike, essentially providing them with a down-payment towards a new bike purchase. At any rate, it’s satisfying to be a part of the recycling process and the Boulder Bikesmith is the first place to visit.
2432 Arapahoe Ave.
Boulder, CO 80302
Phone (303) 443-1132
Open Everyday
10-5 (Winter)
9-6 (Summer)
Email: bikesmith01@yahoo.com
Website
Map & Reviews
22 Boom – Valentine’s Day Special – Episode 49
Feb 8th
It’s the 22 Boom valentines special and more, Boulder with Cold and freezing Homeless in Boulder, the annual Polar Plunge at Boulder Reservoir, Cool After School Haystack, National Western Stock Show, Kinna Grannis – Valentine, Baking with Scott Chocolate Cherry Bread, Hotshots Movie Review of Albert Nobbs by Dan Culberson, St. Valentine’s Day watches at Swiss Chalet Timepieces in Boulder, Jann goes to the UMC Subway sub shop to watch the crowds and learn why they do so great as a restaurant in town. Also more great video archives, with Airport Days WWII Ball, Boulder’s Vintage Bike Swap, the Bag Monster, Boulder Car Share, Boulder NAMI, BMX Bike Kids, Cabela’s, Forney Museum of Transportation, Jessica Slattery-Quintanilla, John Metzger on Boulder Start-ups, Motion Underground Break Dancing and Jann visits the Mt. Antero Road Trip.
Videos in this Episode
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22 Boom Intro -
Jann Scott Live – Homeless Freezing in Boulder -
Annual Alzheimers Polar Plunge -
Cool After School – Haystack Mountain Goat Farm -
National Western Stock Show with Jann Scott -
Kina Grannis – Valentine -
Baking With Scott – Chocolate Cherry Bread -
Hotshots Movie Review of Albert Knobbs -
Swiss Chalet Watches – Valentine’s Day -
Subway Boulder at Base-Mar and UMC Commercial -
Airport Day – 1940’s WWII Ball -
14th Annual Vintage Bike Swap -
Bag Monster -
Boulder CarShare -
National Alliance on Mental Illness, Boulder County -
BMX Bike Kids -
Cabela’s in Sidney Nebraska -
Forney Museum of Transportation -
Jessica Slattery-Quintanilla -
John Metzger on Boulder Start-Ups -
Motion Underground Break Dancing -
Mt. Antero Road Trip with Jann Scott -
Outro
CU study: Glacial ice disappearing at record clip
Feb 8th
caps shedding billions of tons of mass annually
Earth’s glaciers and ice caps outside of the regions of Greenland and Antarctica are shedding roughly 150 billion tons of ice annually, according to a new study led by the University of Colorado Boulder.
The research effort is the first comprehensive satellite study of the contribution of the world’s melting glaciers and ice caps to global sea level rise and indicates they are adding roughly 0.4 millimeters annually, said CU-Boulder physics Professor John Wahr, who helped lead the study. The measurements are important because the melting of the world’s glaciers and ice caps, along with Greenland and Antarctica, pose the greatest threat to sea level increases in the future, Wahr said.
The researchers used satellite measurements taken with the Gravity Recovery and Climate Experiment, or GRACE, a joint effort of NASA and Germany, to calculate that the world’s glaciers and ice caps had lost about 148 billion tons, or about 39 cubic miles of ice annually from 2003 to 2010. The total does not count the mass from individual glacier and ice caps on the fringes of the Greenland and Antarctic ice sheets — roughly an additional 80 billion tons.
“This is the first time anyone has looked at all of the mass loss from all of Earth’s glaciers and ice caps with GRACE,” said Wahr. “The Earth is losing an incredible amount of ice to the oceans annually, and these new results will help us answer important questions in terms of both sea rise and how the planet’s cold regions are responding to global change.”
A paper on the subject is being published in the Feb. 9 online edition of the journal Nature. The first author, Thomas Jacob, did his research at CU-Boulder and is now at the Bureau de Recherches Géologiques et Minières, in Orléans, France. Other paper co-authors include Professor Tad Pfeffer of CU-Boulder’s Institute of Arctic and Alpine Research and Sean Swenson, a former CU-Boulder physics doctoral student who is now a researcher at the National Center for Atmospheric Research in Boulder.
“The strength of GRACE is that it sees everything in the system,” said Wahr. “Even though we don’t have the resolution to look at individual glaciers, GRACE has proven to be an exceptional tool.” Traditional estimates of Earth’s ice caps and glaciers have been made using ground-based measurements from relatively few glaciers to infer what all of the unmonitored glaciers around the world were doing, he said. Only a few hundred of the roughly 200,000 glaciers worldwide have been monitored for a decade or more.
Launched in 2002, two GRACE satellites whip around Earth in tandem 16 times a day at an altitude of about 300 miles, sensing subtle variations in Earth’s mass and gravitational pull. Separated by roughly 135 miles, the satellites measure changes in Earth’s gravity field caused by regional changes in the planet’s mass, including ice sheets, oceans and water stored in the soil and in underground aquifers.
A positive change in gravity during a satellite approach over Greenland, for example, tugs the lead GRACE satellite away from the trailing satellite, speeding it up and increasing the distance between the two. As the satellites straddle Greenland, the front satellite slows down and the trailing satellite speeds up. A sensitive ranging system allows researchers to measure the distance of the two satellites down to as small as 1 micron — about 1/100 the width of a human hair — and to calculate ice and water amounts from particular regions of interest around the globe using their gravity fields.
For the global glaciers and ice cap measurements, the study authors created separate “mascons,” large, ice-covered regions of Earth of various ovate-type shapes. Jacob and Wahr blanketed 20 regions of Earth with 175 mascons and calculated the estimated mass balance for each mascon.
The CU-led team also used GRACE data to calculate that the ice loss from both Greenland and Antarctica, including their peripheral ice caps and glaciers, was roughly 385 billion tons of ice annually. The total mass ice loss from Greenland, Antarctica and all Earth’s glaciers and ice caps from 2003 to 2010 was about 1,000 cubic miles, about eight times the water volume of Lake Erie, said Wahr.
“The total amount of ice lost to Earth’s oceans from 2003 to 2010 would cover the entire United States in about 1 and one-half feet of water,” said Wahr, also a fellow at the CU-headquartered Cooperative Institute for Research in Environmental Sciences.
The vast majority of climate scientists agree that human activities like pumping huge amounts of greenhouse gases in the atmosphere is warming the planet, an effect that is most pronounced in the polar regions.
One unexpected study result from GRACE was that the estimated ice loss from high Asia mountains — including ranges like the Himalaya, the Pamir and the Tien Shan — was only about 4 billion tons of ice annually. Some previous ground-based estimates of ice loss in the high Asia mountains have ranged up to 50 billion tons annually, Wahr said.
“The GRACE results in this region really were a surprise,” said Wahr. “One possible explanation is that previous estimates were based on measurements taken primarily from some of the lower, more accessible glaciers in Asia and were extrapolated to infer the behavior of higher glaciers. But unlike the lower glaciers, many of the high glaciers would still be too cold to lose mass even in the presence of atmospheric warming.”
“What is still not clear is how these rates of melt may increase and how rapidly glaciers may shrink in the coming decades,” said Pfeffer, also a professor in CU-Boulder’s civil, environmental and architectural engineering department. “That makes it hard to project into the future.”
According to the GRACE data, total sea level rise from all land-based ice on Earth including Greenland and Antarctica was roughly 1.5 millimeters per year annually or about 12 millimeters, or one-half inch, from 2003 to 2010, said Wahr. The sea rise amount does include the expansion of water due to warming, which is the second key sea-rise component and is roughly equal to melt totals, he said.
“One big question is how sea level rise is going to change in this century,” said Pfeffer. “If we could understand the physics more completely and perfect numerical models to simulate all of the processes controlling sea level — especially glacier and ice sheet changes — we would have a much better means to make predictions. But we are not quite there yet.”