A redescription of the Antarctic opisthobranch Philine gibba Strebel, 1908, from the type locality, South Georgia, South Atlantic

first_imgPhiline gibba is redescribed using large samples collected from the original type locality (South Georgia, South Atlantic). The specimens examined are compatible with all but one previous description which differs sufficiently to require re-identification. Aspects of the anatomy described here differ in details from earlier studies and it is suggested that previous descriptions are partly erroneous owing to the examination of unrelaxed specimens and some atypical material from small samples.last_img read more

Geochronology of the Lake Region of south-central Chile (39°–42°S): Preliminary results

first_imgCarboniferous, igneous, and metamorphic rocks, followed by Jurassic, Cretaceous, and particularly extensive Miocene granitoid plutons, crop out in the Andes of the Lake Region, as determined by new K-Ar and Rb-Sr whole-rock age determinations. Their spatial distribution appears to define the following: the westernmost and easternmost Paleozoic belts, an oblique belt of Jurassic age, a NNW belt of Cretaceous age developed mainly in Argentina but entering Chile at 39°30′S, and a N-S belt of Miocene batholiths and stocks. This distribution of plutons is unlike the west to east younging belts that have been described from the Andes between 28°S and 32°S. This difference could be related to the presence in the Lake Region of old lineaments oblique to the direction of the Andes and to the influence of the Liquiñe-Ofqui fault zone as a pathway for Miocene magmas. The narrowness of the zone of magmatism from late Paleozoic to Miocene times, compared to the wide outcrops of the Paleozoic accretionary wedge, could be explained by the lack of tectonic erosion during Mesozoic-Cenozoic subduction and the constant subduction geometry.last_img read more

Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 1. Annually resolved accumulation rates

first_imgFor the first time, annually resolved accumulation rates have been determined in central Antarctica by means of counting seasonal signals of ammonium, calcium, and sodium. All records, obtained from three intermediate depth ice cores from Dronning Maud Land, East Antarctica, show rather constant accumulation rates throughout the last 9 centuries with mean values of 63, 61, and 44 mm H2O yr−1 and a typical year-to-year variation of about 30%. For the last few decades, no trend was detected accounting for the high natural variability of all records. A significant weak intersite correlation is apparent only between two cores when the high-frequency part with periods less than 30 years is removed. By analyzing the records in the frequency domain, no persistent periods were found. This suggests that the snow accumulation in this area is mainly influenced by local deposition patterns and may be additionally masked by redistribution of snow due to wind. By comparing accumulation rates over the last 2 millennia a distinct change in the layer thickness in one of the three cores was found, which might be attributed either to an area upstream of the drilling site with lower accumulation rates, or to deposition processes influenced by surface undulations. The missing of a clear correlation between the accumulation rate histories at the three locations is also important for the interpretation of small, short time variations of past precipitation records obtained from deep ice cores.last_img read more

Workshop on the Antarctic wind field

first_imgThe Antarctic is the windiest continent on Earth,with many of the coastal research stationsaffected by strong katabatic winds. The strengthand persistence of the near-surface winds was noted bymany of the early explorers (Fig. 1), and this feature hasbeen perhaps the most intensively studied climatologicalelement since then. In recent years there have beenmany advances in our understanding of the wind fieldboth through the availability of data from automaticweather stations (AWSs) in remote locations and inimprovements in numerical models.For the last four years the Scientific Committee onAntarctic Research (SCAR) has been assessing ourknowledge of the Antarctic wind field and trying toimprove the representation of the winds in climateand numerical weather prediction (NWP) models.This meeting consisted of invited and submittedpapers on many aspects of the Antarctic wind field.During the final morning there was a panel discussionthat summarized our current understanding andconsidered the gaps in our knowledge.last_img read more

Antarctic sea ice proxies from marine and ice core archives suitable for reconstructing sea ice over the past 2000 years

first_imgDramatic changes in sea ice have been observed in both poles in recent decades. However, the observational period for sea ice is short, and the climate models tasked with predicting future change in sea ice struggle to capture the current Antarctic trends. Paleoclimate archives, from marine sedimentary records and coastal Antarctic ice cores, provide a means of understanding sea ice variability and its drivers over decadal to centennial timescales. In this study, we collate published records of Antarctic sea ice over the past 2000 years (2 ka). We evaluate the current proxies and explore the potential of combining marine and ice core records to produce multi-archive reconstructions. Despite identifying 92 sea ice reconstructions, the spatial and temporal resolution is only sufficient to reconstruct circum-Antarctic sea ice during the 20th century, not the full 2 ka. Our synthesis reveals a 90 year trend of increasing sea ice in the Ross Sea and declining sea ice in the Bellingshausen, comparable with observed trends since 1979. Reconstructions in the Weddell Sea, the Western Pacific and the Indian Ocean reveal small negative trends in sea ice during the 20th century (1900–1990), in contrast to the observed sea ice expansion in these regions since 1979.last_img read more

Surface-based Ku- and Ka-band polarimetric radar for sea ice studies

first_imgTo improve our understanding of how snow properties influence sea ice thickness retrievals from presently operational and upcoming satellite radar altimeter missions, as well as to investigate the potential for combining dual frequencies to simultaneously map snow depth and sea ice thickness, a new, surface-based, fully polarimetric Ku- and Ka-band radar (KuKa radar) was built and deployed during the 2019–2020 year-long MOSAiC international Arctic drift expedition. This instrument, built to operate both as an altimeter (stare mode) and as a scatterometer (scan mode), provided the first in situ Ku- and Ka-band dual-frequency radar observations from autumn freeze-up through midwinter and covering newly formed ice in leads and first-year and second-year ice floes. Data gathered in the altimeter mode will be used to investigate the potential for estimating snow depth as the difference between dominant radar scattering horizons in the Ka- and Ku-band data. In the scatterometer mode, the Ku- and Ka-band radars operated under a wide range of azimuth and incidence angles, continuously assessing changes in the polarimetric radar backscatter and derived polarimetric parameters, as snow properties varied under varying atmospheric conditions. These observations allow for characterizing radar backscatter responses to changes in atmospheric and surface geophysical conditions. In this paper, we describe the KuKa radar, illustrate examples of its data and demonstrate their potential for these investigations.last_img read more

Ford scores 35 points, Saint Mary’s beats Utah Valley 92-63

first_img FacebookTwitterLinkedInEmailMORAGA, Calif. (AP) — Jordan Ford scored a career-high 35 points on 11-of-17 shooting to help Saint Mary’s beat Utah Valley 92-63 on Sunday night.Ford made 4 of 6 from 3-point range and 9 of 10 from the free-throw line. The junior, who averaged 19.1 points over the final seven games of last season, had 23 in a season-opening win over McNeese State on Wednesday and has scored in double figures in nine consecutive games dating to last season.Jake Toolson led Utah Valley (1-2) with 15 points and Wyatt Lowell added 14.Ford scored 12 points during an 18-3 run that gave the Gaels (2-0) a 22-8 lead less than seven minutes in and they led by double figures the rest of the way and by as many as 33 in the second half.Tanner Krebs had 13 points and Jordan Hunter 11 for Saint Mary’s, which made 33 of 56 (59 percent) from the field, including 8 of 16 from 3-point range. Written by November 11, 2018 /Sports News – Local Ford scores 35 points, Saint Mary’s beats Utah Valley 92-63 Tags: UVU Wolverines Basketball Associated Presslast_img read more

Scoreboard roundup — 12/13/18

first_imgDecember 14, 2018 /Sports News – National Scoreboard roundup — 12/13/18 Written by Beau Lundcenter_img FacebookTwitterLinkedInEmailiStock(NEW YORK) — Here are the scores from Thursday’s sports events:NATIONAL BASKETBALL ASSOCIATIONHouston 126, L.A. Lakers 111San Antonio 125, L.A. Clippers 87Orlando 97, Chicago 91Phoenix 99, Dallas 89NATIONAL HOCKEY LEAGUEBuffalo 3, Arizona 1Columbus 4, L.A. Kings 1Tampa Bay 4, Toronto 1Montreal 6, Carolina 4OT Nashville 4, Vancouver 3OT Winnipeg 5, Edmonton 4Minnesota 5, Florida 1San Jose 3, Dallas 2NATIONAL FOOTBALL LEAGUEL.A. Chargers 29, Kansas City 28TOP-25 COLLEGE BASKETBALL(16) Wisconsin 101, Savannah St. 60Copyright © 2018, ABC Radio. All rights reserved.last_img read more

Cardinals sign reliever Andrew Miller to two-year deal

first_imgDecember 21, 2018 /Sports News – National Cardinals sign reliever Andrew Miller to two-year deal FacebookTwitterLinkedInEmailJason Miller/Getty Images(ST. LOUIS) — The St. Louis Cardinals and lefty reliever Andrew Miller have agreed to a two-year contract, according to the team’s official website.The Cardinals got their big bat when they traded for Paul Goldschmidt, but now they have some much-needed bullpen help.Miller will be paid $25 million over two years with a chance to earn more in appearance incentives.Miller joined the league in 2006 with the Detroit Tigers, but didn’t pitch as a reliever until the Red Sox moved him to the bullpen in 2012. The two-time All Star finished top 10 in American League Cy Young voting on two occasions, once with the Yankees and again with the Indians. Miller went on to earn AL Championship Series MVP honors with the Indians in 2016.The 33-year-old was one of the most sought-after bullpen arms this offseason, despite coming off of a disappointing 2018 campaign. Miller only pitched in 34 innings in 37 appearances, thanks to injuries to his shoulder, hamstring, and knee. He also posted a 4.24 ERA — his highest since becoming a full-time reliever.The Cardinals are hoping they can make the playoffs this season after narrowly missing out on a Wild Card spot in 2018.Copyright © 2018, ABC Radio. All rights reserved. Written bycenter_img Beau Lundlast_img read more

Utah State Men’s Basketball Visits Air Force Saturday

first_imgJunior guard Sam Merrill currently averages 20 points per game to lead the Aggies and shoots a Mountain West Conference-best 89 percent at the foul line. The Aggies’ current nine conference wins are the most for Utah State in conference play since 2013-14. Freshman center, Portuguese national Neemias Queta (11 points, 9.2 rebounds per game), has five double-doubles in his last seven games for the Aggies. Written by Utah State continues to dominate opponents on average, outscoring them 79 points-66.3 points per game. February 14, 2019 /Sports News – Local Utah State Men’s Basketball Visits Air Force Saturday The Falcons score 67.6 points per game and surrender 71.5 points per contest. FacebookTwitterLinkedInEmailCOLORADO SPRINGS, Colo.-Saturday, Utah State men’s basketball (19-6, 9-3 in Mountain West Conference play) seeks its 20th win of the season by visiting Clune Arena to take on the Air Force Falcons (10-14, 5-7 in conference play).center_img A win against the Falcons would give the Aggies their first 20-win season since 2012-13 and commemorate the 29th time in program history they would have done so. Air Force is led by junior forward Lavelle Scottie (15.1 points, 5.2 rebounds per game) and his fellow junior forward Ryan Swan (12.1 points, 7.1 rebounds per game). The Aggies have also won the battle on the glass in the past eight games. Of those, Utah State has won seven. Tags: Clune Arena/Lavelle Scottie/Mountain West Conference/Neemias Queta/Ryan Swan/Sam Merrill/USU Men’s Basketball The Aggies lead the Falcons 17-5 all-time, including a 6-5 mark at Colorado Springs, Colo. However, the Falcons have won the last two games in the series at Clune Arena. Brad Jameslast_img read more