Posts tagged CU
Ice-free Arctic winters could explain amplified warming during Pliocene
Jul 29th
Year-round ice-free conditions across the surface of the Arctic Ocean could explain why the Earth was substantially warmer during the Pliocene Epoch than it is today, despite similar concentrations of carbon dioxide in the atmosphere, according to new research carried out at the University of Colorado Boulder.
The last time researchers believe the carbon dioxide concentration in the atmosphere reached 400 ppm—between 3 and 5 million years ago during the Pliocene—the Earth was about 3.5 to 9 degrees Fahrenheit warmer (2 to 5 degrees Celsius) than it is today. During that time period, trees overtook the tundra, sprouting right to the edges of the Arctic Ocean, and the seas swelled, pushing ocean levels 65 to 80 feet higher.
Scientists’ understanding of the climate during the Pliocene has largely been pieced together from fossil records preserved in sediments deposited beneath lakes and on the ocean floor.
“When we put 400 ppm carbon dioxide into a model, we don’t get as warm a planet as we see when we look at paleorecords from the Pliocene,” said Jim White, director of CU-Boulder’s Institute of Arctic and Alpine Research and co-author of the new study published online in the journal Palaeogeography, Paleoclimatology, Palaeoecology. “That tells us that there may be something missing in the climate models.”
Scientists have proposed several hypotheses in the past to explain the warmer Pliocene climate. One idea, for example, was that the formation of the Isthmus of Panama, the narrow strip of land linking North and South America, could have altered ocean circulations during the Pliocene, forcing warmer waters toward the Arctic. But many of those hypotheses, including the Panama possibility, have not proved viable.
For the new study, led by Ashley Ballantyne, a former CU-Boulder doctoral student who is now an assistant professor of bioclimatology at the University of Montana, the research team decided to see what would happen if they forced the model to assume that the Arctic was free of ice in the winter as well as the summer during the Pliocene. Without these additional parameters, climate models set to emulate atmospheric conditions during the Pliocene show ice-free summers followed by a layer of ice reforming during the sunless winters.
“We tried a simple experiment in which we said, ‘We don’t know why sea ice might be gone all year round, but let’s just make it go away,’ ” said White, who also is a professor of geological sciences. “And what we found was that we got the right kind of temperature change and we got a dampened seasonal cycle, both of which are things we think we see in the Pliocene.”
In the model simulation, year-round ice-free conditions caused warmer conditions in the Arctic because the open water surface allowed for evaporation. Evaporation requires energy, and the water vapor then stored that energy as heat in the atmosphere. The water vapor also created clouds, which trapped heat near the planet’s surface.
“Basically, when you take away the sea ice, the Arctic Ocean responds by creating a blanket of water vapor and clouds that keeps the Arctic warmer,” White said.
White and his colleagues are now trying to understand what types of conditions could bridge the standard model simulations with the simulations in which ice-free conditions in the Arctic are imposed. If they’re successful, computer models would be able to model the transition between a time when ice reformed in the winter to a time when the ocean remained devoid of ice throughout the year.
Such a model also would offer insight into what could happen in our future. Currently, about 70 percent of sea ice disappears during the summertime before reforming in the winter.
“We’re trying to understand what happened in the past but with a very keen eye to the future and the present,” White said. “The piece that we’re looking at in the future is what is going to happen as the Arctic Ocean warms up and becomes more ice-free in the summertime.
“Will we continue to return to an ice-covered Arctic in the wintertime? Or will we start to see some of the feedbacks that now aren’t very well represented in our climate models? If we do, that’s a big game changer.”
CU-Boulder geological sciences Professor Gifford Miller also is a co-author of the study. Researchers from Northwestern University and the National Center for Atmospheric Research also were involved in the study, which was supported by a grant from the National Science Foundation.
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CU police: Two suspects wanted in connection with backpack, laptop theft
Jul 25th
Police are trying to identify two male suspects who investigators believe are responsible for stealing an unattended backpack outside the Target store, located at 2800 Pearl St., on July 12, 2013. The incident occurred at approximately 3:54 p.m.
The male victim told investigators he was waiting outside the store for an acquaintance to arrive. When the acquaintance showed up, the victim walked away from his backpack for a few minutes, forgetting that he had left it behind. Inside the backpack were personal items and a Samsung laptop computer.
When the victim remembered that he’d left his backpack, he went back to retrieve it and found that it was gone. Surveillance video from Target shows two males, one of whom is believed to have stolen the backpack and laptop. A surveillance photo is attached.
The main suspect is described as:
- White male
- Age unknown
- Brown hair
- Wearing a green windbreaker and shorts, and a white bicycle helmet
- Carrying a blue backpack on his back and the stolen backpack in his arms.
The second suspect is described as:
- White male
- Age unknown
- Wearing blue jeans, a light colored shirt and a red hat.
- Carrying a dark colored backpack on his back and walking two bicycles away from the scene.
When the male suspect stole the backpack, he was seen walking south as he left the area.
The case number is 13-9117.
Anyone with information is asked to contact Det. Craig Beckjord at 303-441-3336. Those who have information but wish to remain anonymous may contact the Northern Colorado Crime Stoppers at 1-800-222-TIPS (8477) or 1-800-444-3776. Tips can also be submitted through the Crime Stoppers website at www.crimeshurt.com. Those submitting tips through Crime Stoppers that lead to the arrest and filing of charges on a suspect(s) may be eligible for a cash reward of up to $1,000 from Crime Stoppers.
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MGM Grand to Host CU mens basketball vs. Ok. St. State
Jul 25th
Coaches vs. Cancer basketball benefit Dec. 21
LAS VEGAS, Nev. – Four Top 25 college basketball programs will be on display at MGM Grand (www.mgmgrand.com) in Las Vegas on Saturday, Dec. 21, 2013 in an inaugural nationally televised doubleheader benefitting Coaches vs. Cancer, an initiative spearheaded by the National Association of Basketball Coaches (www.nabc.com) and the American Cancer Society (www.cancer.org).
The MGM Grand Showcase tips with reigning Mountain West champion New Mexico taking on Marquette at 7:00 p.m. (MT) in the opener, televised live on ESPNU. The University of Colorado Buffaloes will face former Big 12 Conference foe the Oklahoma State Cowboys in the nightcap on ESPN2 at 9:30 p.m. (MT).
CU plays Oregon State at the MGM Grand Garden arena
The two games will be played at the 16,800-seat MGM Grand Garden Arena, home of the biggest names in sports and entertainment including many of boxing’s premier championship bouts over the past two decades. The CU/OSU game will be broadcast to more than 100 million homes on ESPN2.
bd Global, LLC, a Lexington, Ky.-based sports marketing firm, has signed an exclusive three-year contract with MGM Grand to provide college basketball content. The Showcase is the first of several new regular season college basketball events at MGM Grand over the next few seasons. In 2012, the resort played host to the Holiday Hoops Classic and this past March partnered with the Pac-12 Conference to become its new home for the annual Pac-12 Men’s Basketball Tournament.
Colorado went 21-12 during the 2012-13 campaign advanced to its second straight NCAA Tournament (second round) and finished 10-8 in the Pac-12 at the fifth place slot. The Buffs feature 2013 World University Games and first team selection Spencer Dinwiddie. CU also plays its Pac-12 Conference tournament at the MGM Grand.
“We’re excited to play against a storied program, and certainly a Top 25 team like Oklahoma State,” CU head coach Tad Boyle said. “It’s going to be a great opportunity for us.”
The Cowboys were 24-9 last season and finished tied for third in the Big 12 Conference with a 13-5 record. OSU also made the NCAA Tournament last March (second round) and feature All-American Marcus Smart.
CU/OSU played one another on a regular basis from 1948-2011 when both were members of the Big Seven, Big Eight and Big 12 Conferences. The Cowboys lead the all-time series, 60-48, however are 6-6 on neutral courts. The Buffs won the last game between the two programs on Jan. 15, 2011 in Boulder (75-71).
“Many thanks to MGM Grand for its commitment to helping us launch this annual event benefitting a cause that college basketball passionately supports,” said Brooks Downing, president of bd Global (www.bdglobalsports.com), the event promoter. “With four of the nation’s top teams for next season, it will definitely have a March Madness atmosphere that day at MGM Grand.”
Tickets ranging from $30 – $250 (courtside seating), not including applicable service charges and taxes, go on sale Thursday, July 25 at 10 a.m. and will be sold at all Las Vegas Ticketmaster locations (select Smith’s Food and Drug Centers and Ritmo Latino). Ticket sales are limited to eight (8) per person. To charge by phone with a major credit card, call Ticketmaster at (800) 745-3000. Tickets also are available for purchase at www.mgmgrand.com or www.ticketmaster.com.
Complete event information can be found at wwwmgmgrandshowcase.com. For group sales or sponsorship opportunities, interested parties should contact bd Global at 859-951-6141.
New Mexico returns to Las Vegas after winning the Mountain West Conference Tournament at UNLV last March. The Lobos, coming off a 29-6 season, return four starters for new head coach Craig Neal. Senior guard Kendall Williams led the team in scoring last season at 13.3 points per game and junior center Alex Kirk averaged 12.1 per contest to go along with 8.1 rebounds.
Coach Buzz Williams has Marquette primed for another strong year following last season’s run to the Elite Eight. The Golden Eagles captured a share of the Big East regular season title in 2012-13 and advanced to the NCAA Tournament East Regional Final before falling to Syracuse. MU will be led by 6-8, 290 lb. Davante Gardner, a senior forward that averaged 11.5 points and 4.8 rebounds last year.
Oklahoma State and head coach Travis Ford received an unexpected boost when Smart, a National Player of the Year candidate, opted to return for his sophomore season despite being an expected top-five selection in the NBA Draft. The Cowboys return three other starters, including Le’Bryan Nash.
CU head coach Tad Boyle has quickly positioned his Buffs among the elite of the Pac-12 with back-to-back NCAA Tournament appearances since moving to the league in 2011. CU returns four starters from a team that won 21 games a year ago, including Dinwiddie (15.3 points, 3.0 assists) and Askia Booker (12.4 points, 3.5 rebounds).
A portion of every ticket sold for the MGM Grand Showcase will directly benefit Coaches vs. Cancer. The program provides critical mission outreach while raising funds in support of the American Cancer Society’s lifesaving efforts to help people stay well and get well, fund groundbreaking research into cancer’s causes and cures, and fight back through legislative action at the local, state, and national levels. Since 1993, high school and college coaches across the country have raised more than $87 million to support the American Cancer Society’s fight against cancer.
Reggie Minton, NABC deputy executive director, said, “Our NABC coaches have championed the Coaches vs. Cancer program for 20 years now. We are very appreciative for the support we receive for this initiative in the hope of finding a cure for cancer.”
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