Fronts and habitat zones in the Scotia Sea

first_imgThe fronts in the Antarctic Circumpolar Current (ACC) comprise the Southern ACC Front (SACCF), the Polar Front (PF) and Sub-Antarctic Front (SAF), which, together with the Southern Boundary (SB), separate zones with distinct water mass properties in the Southern Ocean. They are important for describing habitat ranges of oceanic species over the range of trophic levels and are also key habitat zones in their own right for a variety of species. Frontal positions were studied along a transect running S to N across the Scotia Sea during three hydrographic cruises in spring 2006, summer 2008 and autumn 2009. Subsurface data from these cruises and Argo data are here combined with Aviso satellite absolute dynamic topography data to locate these fronts, facilitating study of their ecological significance within the Scotia Sea. Northern and southern dynamic height limits are found for each front, as opposed to the more usual one dimensional line. Thus the SB was found between −132 to −116 dyn cm, the SACCF between −115 to −99 dyn cm and the PF between −71 to −45 dyn cm. Argo data allow the sensitivity of the dynamic heights found to be tested against seasonal, interannual and longitudinal effects and each is found to be small. Although the SAF lay beyond the northern extent of the transect we sampled along, Argo profiles allowed us to determine its limits as lying between −5 and +29 dyn cm. The dynamic height limits found are thus suitable for assessing the location, in relation to fronts, of any sample or tracked animal within this area. The chlorophyll distribution across the Scotia Sea is assessed relative to frontal positions and known iron sources. The physical conditions (sea surface temperature, sea ice and mixed layer depth) along the sampling transect are also presented, allowing the oceanographic conditions of the stations occupied across the Scotia Sea to be assessed.last_img read more

Energetic particle forcing of the Northern Hemisphere winter stratosphere: comparison to solar irradiance forcing

first_imgVariation in solar irradiance is considered an important factor in natural climate forcing. Variations in the solar UV in particular are now regarded as a major source of decadal variability in the stratosphere, influencing surface climate through stratosphere–troposphere coupling. However, by analyzing meteorological re-analysis data we find that the magnitude of the solar controlled energetic particle forcing signal in stratospheric zonal mean zonal winds and polar temperatures is equivalent to those arising from solar irradiance variations during the Northern Hemisphere polar winter months. We find that energetic particle forcing drives warmer polar upper stratospheric temperatures from early winter leading to an anomalously strong polar night jet via modulation of the vertical temperature gradient. By midwinter the stratosphere–troposphere coupling pathway becomes analogous to the solar UV impact at high latitudes. This not only highlights the importance of the energetic particle forcing contribution to stratospheric circulation, but enables us to understand the pathways responsible for the previously reported energetic particle forcing impacts on the troposphere in terms of the coupling of solar UV forcing to dynamics in the latter part of the winter.last_img read more

Impact of marine vertebrates on Antarctic terrestrial micro-arthropods

first_imgTraits of primary producers associated with tissue quality are commonly assumed to have strong control over higher trophic levels. However, this view is largely based on studies of vascular plants, and cryptogamic vegetation has received far less attention. In this study natural gradients in nutrient concentrations in cryptogams associated with the proximity of penguin colonies on a Maritime Antarctic island were utilized to quantify the impact of nitrogen content on micro-arthropod communities. Proximity to penguin colonies increased the nitrogen concentration of cryptogams, and the penguin source was confirmed by decreasing δ15N values at greater distances from colonies. Micro-arthropod abundance, diversity (H’) and richness declined with distance from the penguin colonies, and was positively correlated with the nitrogen concentrations of cryptogams. Δ15N of micro-arthropods was positively correlated (r2=0.865, P<0.01) with δ15N of the moss Andreaea depressinervis indicating that penguin-derived nitrogen moves through Antarctic food webs across multiple trophic levels. Nitrogen content of cryptogams was correlated with associated micro-arthropods indicating that biotic interactions affect community development in Antarctic terrestrial ecosystems. The spatial patterns of Antarctic biodiversity can therefore be affected by local factors, such as marine vertebrates, beyond existing latitudinal patterns of temperature and water availability.last_img read more

The Southern Ocean and its interaction with the Antarctic Ice Sheet

first_imgThe Southern Ocean exerts a major influence on the mass balance of the Antarctic Ice Sheet, either indirectly, by its influence on air temperatures and winds, or directly, mostly through its effects on ice shelves. How much melting the ocean causes depends on the temperature of the water, which in turn is controlled by the combination of the thermal structure of the surrounding ocean and local ocean circulation, which in turn is determined largely by winds and bathymetry. As climate warms and atmospheric circulation changes, there will be follow-on changes in the ocean circulation and temperature. These consequences will affect the pace of mass loss of the Antarctic Ice Sheet.last_img read more

Utah Women’s Cross Country Sets Lineup for CSI Invitational

first_img FacebookTwitterLinkedInEmailSALT LAKE CITY-Friday, the University of Utah competes in its second cross country meet of the fall season at the CSI Invitational hosted by the College of Southern Idaho at Idaho Falls, Idaho.Head coach Kyle Kepler reported he likes the course and the fact that this will be a 5-K and says the Utes’ competitors will primarily be “gals who did not race at Utah State” [at the Sagebrush Invitational].Those competing for the Utes at this meet will be sophomore Aubrey Argyle of Kaysville, Utah, redshirt sophomore Emma Christensen of Rochester, Minn., freshman Scarlet Dale of Lancashire, England, junior Nicole Griffiths of Beaverton, Ore., sophomore Natalie Platil of Thornton, Colo., freshman Kennedy Powell of Roosevelt, Utah, freshman Sophie Ryan of Manilus, N.Y., senior Sadie Wassum of Worland, Wyo. and redshirt freshman Cara Woolnough of Brisbane, Australia. Brad James Tags: Aubrey Argyle/Cara Woolnough/CSI Invitational/Emma Christensen/Kennedy Powell/Kyle Kepler/Natalie Platil/Nicole Griffiths/Sadie Wassum/Scarlet Dale/Sophie Ryan/Utah Cross Country September 5, 2018 /Sports News – Local Utah Women’s Cross Country Sets Lineup for CSI Invitational Written bylast_img read more

BYU Men’s Basketball Reconvenes in Rivalry With UNLV

first_imgDecember 13, 2018 /Sports News – Local BYU Men’s Basketball Reconvenes in Rivalry With UNLV Tags: BYU Men’s Basketball/Kris Clyburn/Marvin Menzies/Shakur Juiston/T-Mobile Arena/UNLV Men’s Basketball/Yoeli Childs FacebookTwitterLinkedInEmailLAS VEGAS-Saturday, BYU men’s basketball faces UNLV, a former Mountain West Conference rival, just blocks away from the Thomas & Mack Center at the T-Mobile Arena as part of the Neon Hoops Showcase.This is a 6:30 pm tip-off and can be heard on KSVC-FM 100.5.The Cougars and Rebels have a storied rivalry with UNLV leading narrowly 18-16, but this is their first meeting since the 2010-11 season.BYU is 8-4 on the season, having won their last three games to quell a three-game losing streak prior to that.The Rebels enter this game at 4-4 having lost their last three games.The Cougars are led by the reigning March Madness NCAA National Player of the Week and the West Coast Conference Player of the Week, junior forward Yoeli Childs (22.8 points, 10.9 rebounds per game).BYU averages 84.7 points per game and gives up 74.8 points per contest.The Rebels average 70.9 points per game and give up 66 points per outing. Head coach Marvin Menzies’ squad is led by senior guard Kris Clyburn (11.3 points, 3.8 rebounds per outing) and senior forward Shakur Juiston (10.8 points, 8.8 rebounds per game). Written by Brad Jameslast_img read more

Utah State tops North Texas 52-13 in New Mexico Bowl

first_img FacebookTwitterLinkedInEmailALBUQUERQUE, N.M. (AP) Jordan Love threw for 359 yards and four touchdowns and Jalen Greene had six catches for 151 yards and a score to help Utah State rout North Texas 52-13 in the New MexicoBowl on Saturday.Interim coach Frank Maile directed the Aggies (11-2) after Matt Wells left to take the Texas Tech job.Love completed 21 of 43 passes with one interception. D.J. William had two interceptions, helping Utah State ground high-flying North Texas (9-4).Aaren Vaughns caught two passes for 109 yards and two scores for the Aggies, Gerold Bright ran for 103 yards and two touchdowns on 16 carries, and Darwin Thompson added 93 yards on 21 carries.North Texas quarterback Mason Fine was injured in the first quarter, and the Mean Green ended up using four quarterbacks. Jalen Guyton had four catches for 103 yards a score. December 15, 2018 /Sports News – Local Utah State tops North Texas 52-13 in New Mexico Bowl Written by Tags: New Mexico Bowl/Utah State Aggies Football Associated Presslast_img read more

BYU Wins with Opening Day Walk-Off

first_imgPlaying in his first game for the Cougars since serving a two-year mission, Cluff had two RBIs on the night after also bringing in the first BYU run of the game in the first inning on a sac fly. Sophomore Danny Gelalich, also playing in his first game in two years after returning from a mission, led off the game for BYU with a triple before scoring off the Cluff sacrifice. BYU and Northwestern will play the second game of the series on Saturday at 1 p.m. MT. The game can be seen live on BYU baseball’s Facebook page with audio on ESPN 960 and live stats on the BYU baseball schedule page. Junior Jarod Lessar retired the Wildcats in the top of the 10th, setting up the Cougar heroics in the bottom of the inning and giving Lessar the first win of his BYU career. Robert Lovell February 15, 2019 /Sports News – Local BYU Wins with Opening Day Walk-Off However, Northwestern took a 3-1 lead in the top of the sixth, a margin the Wildcats held until the bottom of the eighth. After BYU loaded the bases, Matthews scored off a wild pitch. Northwestern then coaxed a potential third out on a grounder to the pitcher, but the throw went high, resulting in the runner being safe and Gelalich coming home for the Cougars’ third run. “I can’t say enough about the fight and character we showed tonight,” BYU head coach Mike Littlewood said. “Every guy who took the mound did a great job and we kept grinding at the plate.” Matthews went 2-for-3 with two runs and a walk for BYU while Gelalich added two runs on a triple and a hit by pitch. Written by With runners on first and second and two outs in the bottom of the 10th, sophomore Jackson Cluff hit a hard shot to right-center field that brought freshman Carson Matthews home from second for the walk-off victory. Tags: BYU Cougars Baseball/Walk-Off FacebookTwitterLinkedInEmailMESA, Ariz. – BYU baseball took the Opening Day victory in dramatic fashion, defeating Northwestern 4-3 in 10 innings on Friday at Sloan Park. BYU maintained the 1-0 lead through five innings behind starter Jordan Wood. The Cougars held off the Wildcats after Northwestern loaded the bases in the fourth, including a 1-2-3 double play and an inning-ending strikeout.last_img read more

Prep Sports Roundup: 3/27

first_img Tags: Brinlee Stevens/Bryson Barnes/Keelie Cheff/Lincoln County Lynx/Milford Tigers/Raygen Newton/Reggie Myers/Whitney Shepherd Non-Region EAGLE MOUNTAIN, Utah-Brinlee Stevens earned the win in the circle as the Millard Eagles routed the Rockwell Marshals 19-1 in non-region softball action Wednesday. DELTA, Utah-Tavy Gale and Sydnee Gillins each homered and the Beaver Beavers routed Delta 20-0 Wednesday in non-region softball action. Madi Robinson earned the win in the circle with three shutout innings. Gale’s home run was a grand slam for the Lady Beavers. MONROE, Utah-Karson Hunt hit a pair of doubles and drove in six runs to lead South Sevier to a 13-1 win over Providence Hall in non-region baseball Wednesday. Jarin Robb earned the win on the mound giving up one unearned run in three innings pitched. FacebookTwitterLinkedInEmailBaseball SALINA, Utah-Darci Wagner doubled twice and Savannah Hansen earned the win in ther circle as the South Sevier Rams downed North Sevier 11-5 in non-region softball action Wednesday. Janessa Gayler, Saige Okerlund and Hansen all added doubles in the win for the Rams. Madison Bennett doubled in defeat for the Wolves. Non-Regioncenter_img Softball PANACA, Nev.-Bryson Barnes doubled, but it wasn’t enough as the Milford Tigers fell 3-2 to the Lincoln County (Nev.) Lynx Wednesday in non-region baseball action. SPRINGVILLE, Utah-Keelie Cheff and Whitney Shepherd each went yard as the Springville Red Devils routed Juab 18-6 Wednesday in non-region softball action. Brinlee Paystrup took the win in the circle for the Class 5-A Red Devils. Raygen Newton and Reggie Myers doubled for the Wasps in the loss. Written by March 27, 2019 /Sports News – Local Prep Sports Roundup: 3/27 Brad Jameslast_img read more

Cincinnati Bengals’ A.J. Green suffers setback, out indefinitely

first_img FacebookTwitterLinkedInEmailPhoto by Scott Clarke / ESPN Images(CINCINNATI) — Cincinnati Bengals wide receiver A.J. Green has suffered another setback as he tries to return from an ankle injury suffered during the preseason, and now his return is completely up in the air.The star receiver says he is unlikely to make his season debut this weekend against the Baltimore Ravens. He told reporters that his left ankle didn’t respond well to workouts earlier in the week.“For me, just gotta make sure I feel comfortable going out there and pushing it,” Green said Thursday. “I [have to] take care of me first before anything else.”Green tore multiple ligaments in his ankle during the team’s first preseason practice in Dayton, Ohio. Bengals players criticized the turf on that field after the injury.Green had begun doing individual drills in recent weeks, and was said to be nearing full participation in practice. But on Thursday he said “my ankle is saying it’s too much. That’s when you gotta back off.”Copyright © 2019, ABC Audio. All rights reserved. November 7, 2019 /Sports News – National Cincinnati Bengals’ A.J. Green suffers setback, out indefinitely Written bycenter_img Beau Lundlast_img read more