Ocean mixing beneath Pine Island Glacier ice shelf, West Antarctica

first_imgIce shelves around Antarctica are vulnerable to an increase in ocean-driven melting, with the melt rate depending on ocean temperature and the strength of flow inside the ice-shelf cavities. We present measurements of velocity, temperature, salinity, turbulent kinetic energy dissipation rate, and thermal variance dissipation rate beneath Pine Island Glacier ice shelf, West Antarctica. These measurements were obtained by CTD, ADCP, and turbulence sensors mounted on an Autonomous Underwater Vehicle (AUV). The highest turbulent kinetic energy dissipation rate is found near the grounding line. The thermal variance dissipation rate increases closer to the ice-shelf base, with a maximum value found ∼0.5 m away from the ice. The measurements of turbulent kinetic energy dissipation rate near the ice are used to estimate basal melting of the ice shelf. The dissipation-rate-based melt rate estimates is sensitive to the stability correction parameter in the linear approximation of universal function of the Monin-Obukhov similarity theory for stratified boundary layers. We argue that our estimates of basal melting from dissipation rates are within a range of previous estimates of basal melting.last_img read more

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2021-05-09

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Metapopulation dynamics of roseate terns: Sources, sinks and implications for conservation management decisions

first_imgHabitat management to restore or create breeding sites may allow metapopulations to increase in size and reduce the risk of demographic stochasticity or disasters causing metapopulation extinction. However, if newly restored or created sites are of low quality, they may act as sinks that draw individuals away from better quality sites to the detriment of metapopulation size. Following intensive conservation effort, the metapopulation of roseate tern (Sterna dougallii) in NW Europe is recovering from a large crash in numbers, but most former colonies remain unoccupied and hence are potential targets for restoration. To inform conservation efforts, we studied the dynamics of this metapopulation with a multistate integrated population model to assess each of the three main colonies for important demographic contributors to population growth rate, source/sink status and possible density dependence. All three study colonies are managed for roseate terns (and other tern species) in similar ways, but the demographic processes vary considerably between colonies. The largest colony is a source involved in almost all dispersal, and its growth is determined by survival rates and productivity. Productivity and juvenile apparent survival at the largest colony appear to be density-dependent. Although the mechanisms are unclear, this may provide an increasing impetus for emigration of recruits to other colonies in future. The smallest of the three colonies is a sink, relying on immigration for its growth. Simulation models suggest the metapopulation would be c. 10% larger in the absence of dispersal to the sink colony. This work indicates that, due to variable site quality, aims to enhance both distribution and size of metapopulations may be mutually exclusive. In this case, before future attempts to encourage recolonisation of former sites, assessments of site suitability should be undertaken, focusing on food availability and isolation from predators to maximise the likelihood of attaining levels of productivity and survival that avoid creation of a sink population to the detriment of the overall metapopulation size.last_img read more

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2021-05-09

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Impact of EMIC‐wave driven electron precipitation on the radiation belts and the atmosphere

first_imgIn recent years there has been a growing body of direct experimental evidence demonstrating electromagnetic ion cyclotron (EMIC) waves driving energetic electron precipitation (EEP) at unexpectedly low, sub‐MeV energies — as low as only a few hundred keV. EMIC wave driven scattering at these energies has important ramifications for our understanding of not only radiation belt electron dynamics, but also the importance of EMIC‐driven EEP to the chemical balance of the Earth’s atmosphere. In this study, we use three experimentally derived EMIC‐driven EEP flux spectra to investigate the impact of this precipitation on trapped radiation belt fluxes. In doing so, we resolve an apparent contradiction with earlier results derived from trapped electron flux populations that suggested EMIC waves only caused significant scattering at ultra‐relativistic energies. We show that strong sub‐MeV EEP measurements are not necessarily mutually exclusive with a strongly relativistic‐only trapped flux response, as the sub‐MEV peak precipitation is comparatively much smaller than the trapped population at those energies. Using a further six EEP spectra, we also demonstrate that EMIC‐driven EEP can generate significant ionisation of the Earth’s atmosphere above 40km, leading to the loss of mesospheric ozone. We find poor correlation between EMIC‐driven EEP fluxes and geomagnetic activity proxies, such that EMIC‐driven EEP is likely to be poorly specified in the forcing factors of modern coupled‐climate models.last_img read more

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2021-05-09

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SUU Women’s Soccer Announces 2018 Schedule

first_img FacebookTwitterLinkedInEmailCEDAR CITY, Utah-Thursday, Southern Utah University’s women’s soccer team announced its 2018 schedule which consists of nineteen games.The Thunderbirds will start things out August 10 with an exhibition match against Utah State in Cedar City.They then head to Michigan to face the Big Ten’s Michigan State Spartans August 17 and will then travel to Mount Pleasant, Mich. to face the Mid-American Conference’s Central Michigan Chippewas August 19.The first regular-season home match for the Thunderbirds is August 23 against UNLV and on September 16, SUU concludes its non-conference portion of the season by visiting Division I newcomer Cal Baptist.On September 21, the Thunderbirds commence the Big Sky Conference season with a road match at Weber State. One month later, October 21, the regular season concludes as the Thunderbirds will have Senior Day with a home match against Eastern Washington. Written by June 28, 2018 /Sports News – Local SUU Women’s Soccer Announces 2018 Schedule Tags: Cal Baptist/Central Michigan/Eastern Washington/Michigan State/SUU Soccer/UNLV Brad Jameslast_img read more

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2021-05-08

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Utah State Football Adds Jalil Brown As Cornerbacks Coach

first_img Tags: Colorado/Gary Andersen/Indianapolis Colts/Jalil Brown/Kansas City Chiefs/Khalil Dorsey/Maurice Davison/Miami Dolphins/Northern Arizona University/USU Football FacebookTwitterLinkedInEmailLOGAN, Utah-Wednesday, Utah State head football coach Gary Andersen announced Jalil Brown as the Aggies’ new cornerbacks coach.Brown brings extensive experience both as a star player and an assistant coach to his new post at Logan.A former two-time all-Big 12 cornerback at Colorado (2006-2010) and a standout with the NFL’s Kansas City Chiefs (2011-2012), Indianapolis Colts (2013; 2014-2015) and Miami Dolphins (2013-2014), Brown commenced his coaching career in 2017 as Boise State’s assistant strength coach.The Broncos then promoted him as a defensive analyst in 2018. Later on in 2018, he was hired by Northern Arizona University to coach the Lumberjacks’ cornerbacks.While at NAU, he helped the Lumberjacks become the 13th best pass defense (179.7 yards per game) at the FCS level.Two of his star players, Khalil Dorsey (1st team all-Big Sky Conference) and Maurice Davison (3rd team all-Big Sky Conference) were named as all-conference performers.Brown is a 2010 graduate of Colorado, earning degrees in sociology and business management. Written by Brad James January 2, 2019 /Sports News – Local Utah State Football Adds Jalil Brown As Cornerbacks Coachlast_img read more

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2021-05-08

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SUU Football Goes On Road To Face No. 3 South Dakota State

first_img Tags: Aaron Romero/Beef Bowl/Cade Johnson/Chase Norblade/Chris Helbig/Christian Rozeboom/Drake/J’Bore Gibbs/James Felila/Josh Manchigiah/Kanin Nelson/Lance Lawson/Logan Backhaus/Long Island/Murray State/Nela Otukolo/Pierre Strong Jr./Quinton Hicks/Ryan Earith/Seven Wilson/South Dakota State football/SUU Football Written by Brad James September 19, 2019 /Sports News – Local SUU Football Goes On Road To Face No. 3 South Dakota State FacebookTwitterLinkedInEmailBROOKINGS, S.D.-Saturday, Southern Utah University football seeks to build upon its momentum from a 45-38 overtime win over Stephen F. Austin last weekend by visiting No. 3 South Dakota State at Dana J. Dykhouse Stadium of Brookings, S.D.This game represents the 53rd annual Beef BowlThis is the 1-2 Thunderbirds’ last non-Big Sky Conference game of the season.Presently, the Thunderbirds rank 56th nationally in scoring offense (27.3 points) and are tied for 102nd (with Murray State) in scoring defense by giving up 42.7 points per game.SUU is led by redshirt sophomore signal-caller Chris Helbig, who has completed 65 of 105 passes (61.9 percent) for 639 yards, two touchdowns and two interceptions this season.Redshirt junior tailback James Felila has run for 115 yards and a pair of scores on 38 carries to lead the Thunderbirds.Sophomore tailback Lance Lawson, the reigning College Madness Big Sky Conference offensive player of the week, is the Thunderbirds’ leading receiver. He has hauled in 28 grabs for 251 yards and a pair of scores on the season for SUU this season.Redshirt senior linebacker Nela Otukolo leads the Thunderbirds with 20 tackles, a sack, a fumble recovery and a pass breakup.The sacks leader for SUU is sophomore defensive lineman Aaron Romero, who has three sacks and a forced fumble.The 2-1 Jackrabbits have won two straight games after narrowly losing to FBS Power 5 conference foe Minnesota, 28-21 at Minneapolis.They then routed Long Island 38-3 and Drake 38-10.The Jackrabbits rank 37th nationally in scoring offense (32.3 points per game) and are eighth nationally in scoring defense (13.7 points per game).South Dakota State is paced by junior signal-caller Kanin Nelson who has completed 18 of 26 passes (69.2 percent) for 267 yards and three touchdowns. The Jackrabbits have also played redshirt freshman J’Bore Gibbs, who has completed 13 of his 26 passes (50 percent) for 193 yards, a touchdown and an interception.Sophomore tailback Pierre Strong Jr. lives up to his name by running for 237 yards and a pair of scores on 35 carries, a 6.8 yard average.Junior receiver Cade Johnson has 14 grabs for 239 yards (17.1 yards per reception) and two touchdowns for the Jackrabbits as the squad’s leading receiver.Junior linebacker Seven Wilson leads the Jackrabbits’ defense with 21 tackles. Senior defensive end Ryan Earith leads the squad with three sacks. Also, senior linebacker Christian Rozeboom has posted both an interception and a forced fumble.Junior linebacker Logan Backhaus has amassed an interception and team-bests in passes defensed (4) and passes broken up (3).Freshman defensive end Quinton Hicks has a sack, a forced fumble and two tackles for a loss.Junior safety Josh Manchigiah freshman safety Chase Norblade have each added an interception for the Jackrabbits.South Dakota State leads the all-time series 6-1.last_img read more

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2021-05-08

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Weber State’s Doug Lloyd Named As Big Sky Special Teams Player of the Week

first_img FacebookTwitterLinkedInEmailOGDEN, Utah-Monday, Weber State senior punter Doug Lloyd was named as the Big Sky Conference special teams player of the week for his contributions to the Wildcats’ 29-17 win over Northern Iowa Saturday at Stewart Stadium.Lloyd is a native of Mount Gambier, Australia and has seven punts for a career-best net-average 46.7 yards per punt.Five of his seven punts marooned the Panthers inside their own 20-yard line, with three of them downed at the Northern Iowa 2-yard line.He had a career-long 72-yard punt in the 3rd Quarter, which is tied for the 14th longest punt in program history.Lloyd currently ranks fourth in the Big Sky with 43.4 yards per punt.The Wildcats will visit Moscow, Idaho Saturday as they ensue in their Big Sky Conference season against the Vandals at the Kibbie Dome. September 30, 2019 /Sports News – Local Weber State’s Doug Lloyd Named As Big Sky Special Teams Player of the Week Tags: Big Sky Conference/Doug Lloyd/Idaho Vandals/Kibbie Dome/Northern Iowa Panthers/Weber State Football Written by Brad Jameslast_img read more

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2021-05-08

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Snow Loses 54-13 At Iowa Western

first_img Tags: Arizona Western/Iowa Western Reivers/Jose Pizano/New Mexico Military Institute/Snow College football/Weston Barlow Written by FacebookTwitterLinkedInEmailCOUNCIL BLUFFS, Iowa-The No. 9 Snow College Badgers were outplayed by the no. 18 Iowa Western Reivers on Saturday afternoon, falling 54-13, their worst loss of the season.Despite the Badgers leading in first downs, time of possession and total offensive yards, they were not able to capitalize on any scoring opportunities outside of two field goals from Jose Pizano and a 20-yard touchdown run by Weston Barlow in the second quarter. Snow College’s secondary could not contain the Iowa Western receivers on big passing plays, conceding five touchdowns in the air and 188 total passing yards. Gerald Wilbon had the sole highlight of the day for the Badger secondary coming up with an interception. The last time that the Badgers gave up 50 points was against Arizona Western College in 2016, and the last time that the Badgers gave up more than 50 points came back in 2009 against New Mexico Military Institute where they allowed 54 points. Incidentally, the Badgers defeated the Broncos that day, 64-54.Signal-caller Garrison Beech completed 19 of 35 passes for an interception while losing a fumble as he struggled throughout the afternoon.  The Badgers now fall to 4-3 on the season and will most likely slide down in this week’s NJCAA rankings. Snow College hosts Gila River next Saturday at 1 pm at Ephraim, Utah. The game will be available on radio stations KMTI AM 650 and 95.1 FM, with live streaming available at local10.centracom.com or on the YouTube channel WATCHit/SnowTV.Print Friendly Version October 21, 2019 /Sports News – Local Snow Loses 54-13 At Iowa Western Brad Jameslast_img read more

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2021-05-08

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UHSAA extends suspension of spring sports and activities through May 1

first_img Robert Lovell FacebookTwitterLinkedInEmailMIDVALE, Utah (March 24, 2020) – The Utah High School Activities Association is announcing an extension to the ongoing suspension of the Association’s spring activities and athletics, due to ongoing statewide prevention efforts with the COVID-19 virus.As a result of Governor Herbert’s directive in a March 23 press conference, the Association continues to suspend all UHSAA spring activities and athletics, including practice and/or team gatherings, until at least May 1, in line with the state-recommended extension to the school soft closure.In consultation with board directives and information provided by state public health officials, the UHSAA has suspended spring activities and athletics, including practice and team gatherings, to properly fulfill best practices regarding protection of students and the general public. More information will be sent to member schools and/or districts as it becomes available. Tags: Coronavirus/COVID-19/UHSAA Written by March 24, 2020 /Coronavirus (COVID-19) related news and sports stories, Sports News – Local UHSAA extends suspension of spring sports and activities through May 1last_img read more

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2021-05-08

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Juab High School Wrestling Coach Joel Holman and His Assistants Honored

first_img FacebookTwitterLinkedInEmailMANHEIM, Pa.-Sunday, Juab High School wrestling coach Joel Holman and his assistant coaches, Garrison Ludlow, Kyle Bell, Nefi Ramirez, Ryan Wright and Dalton Harmon were honored with  the National Wrestling Coaches Association Section 7 (Western United States) Boys High School Head Coach of the Year and Assistant Coaching Staff of the Year awards.Holman was named as the NWCA’s high school boys coach of the year for Section 7 after winning the state coach of the year award in Utah. In winning this section award, Holman also became a finalist for the NWCA National Boys Coach of the Year Award.Holman has led the Wasps to four consecutive state wrestling championships.Holman’s aforementioned assistants were named as the NWCA’s Assistant Coaching Staff of the Year for Section 7 after winning the state assistant coach of the year honor for Utah.The Wasps’ staff have also become finalists for the NWCA National Boys Assisting Coach Staff of the Year award. Written by Tags: Juab wrestling Brad James June 28, 2020 /Sports News – Local Juab High School Wrestling Coach Joel Holman and His Assistants Honoredlast_img read more

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2021-05-08

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