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Depositional Settings of the Basal López De Bertodano Formation, Maastrichtian, Antarctica
Revista de la Asociación Geológica Argentina 62 (4): 521-529 (2007) 521 DEPOSITIONAL SETTINGS OF THE BASAL LÓPEZ DE BERTODANO FORMATION, MAASTRICHTIAN, ANTARCTICA Eduardo B. OLIVERO1, Juan J. PONCE1, Claudia A. MARSICANO2, and Daniel R. MARTINIONI1 ¹ Laboratorio de Geología Andina, CADIC-CONICET, B. Houssay 200, CC 92, 9410 Ushuaia, Tierra del Fuego, Argentina. E-Mail: [email protected] 2 Dpto. Cs. Geológicas, Universidad Buenos Aires, Ciudad Universitaria Pab. II, C1428 DHE Buenos Aires. ABSTRACT: In Snow Hill and Seymour islands the lower Maastrichtian, basal part of the López de Bertodano Formation, rests on a high relief, erosi- ve surface elaborated in the underlying Snow Hill Island Formation. Mudstone-dominated beds with inclined heterolithic stratification dominate the basal strata of the López de Bertodano Formation. They consist of rhythmical alternations of friable sandy- and clayey- mudstone couplets, with ripple cross lamination, mud drapes, and flaser bedding. They are characterized by a marked lenticular geometry, reflecting the filling of tide-influenced channels of various scales and paleogeographic positions within a tide-dominated embayment or estuary. Major, sand-rich channel fills, up to 50-m thick, bounded by erosive surfaces probably represent inlets, located on a more central position in the estuary. Minor channel fills, 1- to 3-m thick, associated with offlapping packages with inclined heterolithic stratification pro- bably represent the lateral accretion of point bars adjacent to migrating tidal channels in the upper estuary. Both types of channel fills bear relatively abundant marine fauna, are intensively bioturbated, and are interpreted as a network of subtidal channels. In southwestern Snow Hill Island, the minor offlapping packages have scarce marine fossils and bear aligned depressions interpreted as poor preserved dinosaur footprints. -
Antarctic Peninsula
Hucke-Gaete, R, Torres, D. & Vallejos, V. 1997c. Entanglement of Antarctic fur seals, Arctocephalus gazella, by marine debris at Cape Shirreff and San Telmo Islets, Livingston Island, Antarctica: 1998-1997. Serie Científica Instituto Antártico Chileno 47: 123-135. Hucke-Gaete, R., Osman, L.P., Moreno, C.A. & Torres, D. 2004. Examining natural population growth from near extinction: the case of the Antarctic fur seal at the South Shetlands, Antarctica. Polar Biology 27 (5): 304–311 Huckstadt, L., Costa, D. P., McDonald, B. I., Tremblay, Y., Crocker, D. E., Goebel, M. E. & Fedak, M. E. 2006. Habitat Selection and Foraging Behavior of Southern Elephant Seals in the Western Antarctic Peninsula. American Geophysical Union, Fall Meeting 2006, abstract #OS33A-1684. INACH (Instituto Antártico Chileno) 2010. Chilean Antarctic Program of Scientific Research 2009-2010. Chilean Antarctic Institute Research Projects Department. Santiago, Chile. Kawaguchi, S., Nicol, S., Taki, K. & Naganobu, M. 2006. Fishing ground selection in the Antarctic krill fishery: Trends in patterns across years, seasons and nations. CCAMLR Science, 13: 117–141. Krause, D. J., Goebel, M. E., Marshall, G. J., & Abernathy, K. (2015). Novel foraging strategies observed in a growing leopard seal (Hydrurga leptonyx) population at Livingston Island, Antarctic Peninsula. Animal Biotelemetry, 3:24. Krause, D.J., Goebel, M.E., Marshall. G.J. & Abernathy, K. In Press. Summer diving and haul-out behavior of leopard seals (Hydrurga leptonyx) near mesopredator breeding colonies at Livingston Island, Antarctic Peninsula. Marine Mammal Science.Leppe, M., Fernandoy, F., Palma-Heldt, S. & Moisan, P 2004. Flora mesozoica en los depósitos morrénicos de cabo Shirreff, isla Livingston, Shetland del Sur, Península Antártica, in Actas del 10º Congreso Geológico Chileno. -
Multidecadal Warming and Density Loss in the Deep Weddell Sea, Antarctica
15 NOVEMBER 2020 S T R A S S E T A L . 9863 Multidecadal Warming and Density Loss in the Deep Weddell Sea, Antarctica VOLKER H. STRASS,GERD ROHARDT,TORSTEN KANZOW,MARIO HOPPEMA, AND OLAF BOEBEL Alfred-Wegener-Institut Helmholtz-Zentrum fur€ Polar- und Meeresforschung, Bremerhaven, Germany (Manuscript received 16 April 2020, in final form 10 August 2020) ABSTRACT: The World Ocean is estimated to store more than 90% of the excess energy resulting from man-made greenhouse gas–driven radiative forcing as heat. Uncertainties of this estimate are related to undersampling of the subpolar and polar regions and of the depths below 2000 m. Here we present measurements from the Weddell Sea that cover the whole water column down to the sea floor, taken by the same accurate method at locations revisited every few years since 1989. Our results show widespread warming with similar long-term temperature trends below 700-m depth at all sampling sites. The mean heating rate below 2000 m exceeds that of the global ocean by a factor of about 5. Salinity tends to increase—in contrast to other Southern Ocean regions—at most sites and depths below 700 m, but nowhere strongly enough to fully compensate for the warming effect on seawater density, which hence shows a general decrease. In the top 700 m neither temperature nor salinity shows clear trends. A closer look at the vertical distribution of changes along an ap- proximately zonal and a meridional section across the Weddell Gyre reveals that the strongest vertically coherent warming is observed at the flanks of the gyre over the deep continental slopes and at its northern edge where the gyre connects to the Antarctic Circumpolar Current (ACC). -
Federal Register/Vol. 84, No. 78/Tuesday, April 23, 2019/Rules
Federal Register / Vol. 84, No. 78 / Tuesday, April 23, 2019 / Rules and Regulations 16791 U.S.C. 3501 et seq., nor does it require Agricultural commodities, Pesticides SUPPLEMENTARY INFORMATION: The any special considerations under and pests, Reporting and recordkeeping Antarctic Conservation Act of 1978, as Executive Order 12898, entitled requirements. amended (‘‘ACA’’) (16 U.S.C. 2401, et ‘‘Federal Actions to Address Dated: April 12, 2019. seq.) implements the Protocol on Environmental Justice in Minority Environmental Protection to the Richard P. Keigwin, Jr., Populations and Low-Income Antarctic Treaty (‘‘the Protocol’’). Populations’’ (59 FR 7629, February 16, Director, Office of Pesticide Programs. Annex V contains provisions for the 1994). Therefore, 40 CFR chapter I is protection of specially designated areas Since tolerances and exemptions that amended as follows: specially managed areas and historic are established on the basis of a petition sites and monuments. Section 2405 of under FFDCA section 408(d), such as PART 180—[AMENDED] title 16 of the ACA directs the Director the tolerance exemption in this action, of the National Science Foundation to ■ do not require the issuance of a 1. The authority citation for part 180 issue such regulations as are necessary proposed rule, the requirements of the continues to read as follows: and appropriate to implement Annex V Regulatory Flexibility Act (5 U.S.C. 601 Authority: 21 U.S.C. 321(q), 346a and 371. to the Protocol. et seq.) do not apply. ■ 2. Add § 180.1365 to subpart D to read The Antarctic Treaty Parties, which This action directly regulates growers, as follows: includes the United States, periodically food processors, food handlers, and food adopt measures to establish, consolidate retailers, not States or tribes. -
Helicopter Operations of the Argentine Air Force in Antarctica 1968 - 2015
transactions of the institute of aviation ISSN 0509-6669 no. 1(242) , pp. 57-71, Warsaw 2016 eISSN 2300-5408 Doi: 10.5604/05096669.1202202 heLicoPter oPerations of the arGentine air force in antarctica 1968 - 2015 GuIllermo S. P oSadaS argentine air Force abstract This paper is a very brief summary of the operations of the argentine air Force (aaF) helicopters in the argentine antarctic. It is a transcription of a Power Point Presentation of the lecture that was given on June 26, 2015 during the X National Helicopter Forum 2015 held at the Institute of aviation in Poland. Keywords : argentine air Force, helicopter operations, antarctic. 1. introDuction The antarctica is a hostile and deserted territory with extremely low temperatures. Winters are long and in summers sometimes the weather conditions do not allow for air operations to last longer than a few hours per day. However,it is possible to operate helicopters safely,following certain guidelines and having the right equipment which is not always very sophisticated. Helicopter operations in the antarctica are very risky and for that reason their preparation has to be very careful in order to make the as safe as possible. It is essential to have fuel, lubricating oils and fluids suitable for low temperatures as well as well-trained people. 2. Brief DescriPtion of the antarctic continent Fig. 1 the antarctic continent,where the South Pole , is located is in the south hemisphere from parallel 60° South. The antarctic Continent has a surface of 14 millions of km 2. during summer the area free of ice is only 280 000 km 2. -
A NTARCTIC Southpole-Sium
N ORWAY A N D THE A N TARCTIC SouthPole-sium v.3 Oslo, Norway • 12-14 May 2017 Compiled and produced by Robert B. Stephenson. E & TP-32 2 Norway and the Antarctic 3 This edition of 100 copies was issued by The Erebus & Terror Press, Jaffrey, New Hampshire, for those attending the SouthPole-sium v.3 Oslo, Norway 12-14 May 2017. Printed at Savron Graphics Jaffrey, New Hampshire May 2017 ❦ 4 Norway and the Antarctic A Timeline to 2006 • Late 18th Vessels from several nations explore around the unknown century continent in the south, and seal hunting began on the islands around the Antarctic. • 1820 Probably the first sighting of land in Antarctica. The British Williams exploration party led by Captain William Smith discovered the northwest coast of the Antarctic Peninsula. The Russian Vostok and Mirnyy expedition led by Thaddeus Thadevich Bellingshausen sighted parts of the continental coast (Dronning Maud Land) without recognizing what they had seen. They discovered Peter I Island in January of 1821. • 1841 James Clark Ross sailed with the Erebus and the Terror through the ice in the Ross Sea, and mapped 900 kilometres of the coast. He discovered Ross Island and Mount Erebus. • 1892-93 Financed by Chr. Christensen from Sandefjord, C. A. Larsen sailed the Jason in search of new whaling grounds. The first fossils in Antarctica were discovered on Seymour Island, and the eastern part of the Antarctic Peninsula was explored to 68° 10’ S. Large stocks of whale were reported in the Antarctic and near South Georgia, and this discovery paved the way for the large-scale whaling industry and activity in the south. -
Numbers of Adelie Penguins Breeding at Hope Bay and Seymour Island Rookeries (West Antarctica) in 1985
POLISH POLAR RESEARCH (POL. POLAR RES.) 8 4 411—422. 1987 Andrzej MYRCHA", Andrzej TATUR2» and Rodolfo del VALLE3) " Institute of Biology, Warsaw University, Branch in Białystok, 64 Sosnowa. 15-887 Białystok, POLAND 2) Department of Biogeochemistry, Institute of Ecology, Polish Academy of Sciences, Dziekanów Leśny. 05-092 Łomianki. POLAND 31 Instituto Antarctico Ąrgcntino, Cerrito 1248. Capital Federal, ARGENTINA Numbers of Adelie penguins breeding at Hope Bay and Seymour Island rookeries (West Antarctica) in 1985 ABSTRACT: At the turn of October 1985, the abundance of breeding Adelie penguins was estimated at the Hope Bay oasis on the Antarctic Peninsula and on Seymour Island. In the Hope Bay rookery, 123850 pairs of penguins were recorded, beginning their breeding at the end of October. Data so far obtained indicate a continuous increase in the number of birds sat this rookery. On the other hand, the Seymour Island colony consisted of 21954 pairs of Adelie penguins. Clear differences in the geomorphological structure of areas occupied by penguins in those two places are discussed. No gentoo penguins were detected in either of the colonies. Key words: Antarctica. Hope Bay, Seymour Island, Adelie penguins. 1. Introduction Birds occurring in south polar regions for long have attracted much attention due to their importance in the functioning of the marine Antarctic ecosystem. The great abundance of these few species makes them play a significant role in the economy of energy of the Southern Ocean (Croxall 1984, Laws 1985). Among these birds penguins are dominant, comprising over 90% of the bird biomass in this region. The Adelie penguins, in turn, are one of the most numerous of the Antarctic species. -
Intercomparison of Ground- and Satellite-Based Total Ozone Data Products at Marambio Base, Antarctic Peninsula Region
atmosphere Article Intercomparison of Ground- and Satellite-Based Total Ozone Data Products at Marambio Base, Antarctic Peninsula Region Klára Cˇ ížková 1,2,*, Kamil Láska 1 , Ladislav Metelka 2 and Martin Stanˇek 2 1 Department of Geography, Faculty of Science, Masaryk University, 611 37 Brno, Czech Republic; [email protected] 2 Solar and Ozone Observatory, Czech Hydrometeorological Institute, 500 08 Hradec Králové, Czech Republic; [email protected] (L.M.); [email protected] (M.S.) * Correspondence: [email protected] Received: 26 October 2019; Accepted: 15 November 2019; Published: 18 November 2019 Abstract: This study aims to compare the ground-based Brewer spectrophotometer total ozone column measurements with the Dobson spectrophotometer and various satellite overpass data available at Marambio Base during the period 2011–2013. This station provides a unique opportunity to study ozone variability near the edge of the southern polar vortex; therefore, many institutions, such as the National Meteorological Service of Argentina, the Finnish Meteorological Institute and the Czech Hydrometeorological Institute, have been carrying out various scientific activities there. The intercomparison was performed using total ozone column data sets retrieved from the ground-based instruments and from Ozone Monitoring Instrument (OMI)—Total Ozone Mapping Spectrometer (TOMS), OMI–Differential Optical Absorption Spectroscopy (DOAS), Global Ozone Monitoring Experiment 2 (GOME2), and Scanning Imaging Absorption Spectrophotometer for Atmospheric Cartography (SCIAMACHY) satellite observations. To assess the quality of the selected data products, comparisons with reference to the Brewer spectrophotometer single observations were made. The performance of the satellite observational techniques was assessed against the solar zenith angle and effective temperature, as well as against the actual shape of the vertical ozone profiles, which represent an important input parameter for the satellite ozone retrievals. -
Gazette Quarterly
EEXXPPLLOORREERR’’SS GGAAZZEETTTTEE Published Quarterly in Pensacola, Florida USA for the Old Antarctic Explorers Association Uniting All OAEs in Perpetuating the Memory of United States Involvement in Antarctica Volume 18, Issue 3 Old Antarctic Explorers Association, Inc Jul-Sep 2018 Photo courtesy of Sydney Cullis The HMS Terra Nova departing Simon’s Bay for Antarctica in 1910. Painting commissioned by Sydney Cullis The Antarctic-African Connection By Ed Hamblin off our tour with four nights there. I thought we might be hen one thinks of Africa, probably jungles, rugged able to get together for a drink or something and socialize a W landscapes, and wild animals are what come to mind. bit. After a series of back and forth e-mails, we had a date But Antarctica? during some of our tour “dead time” to meet up. Also Last fall, my wife and I decided to take a trip to South through those e-mails, Dr. Cullis started apprising me of the Africa, as part of an organized tour in order to get an Cape Town area Antarctic points of interest, and forwarded opportunity to see routine African “stuff”. We booked a me a few pictures. Thanks to the pictures, I found out Cape two-week trip for April of 2018 with some “travel buddies” Town has been a stopping off point for Antarctic we had met previously in the Galapagos Islands. Shortly expeditions dating to the 18th century. Many of the early after that, I decided to see if I could connect with one of our explorers we are all familiar with spent time in Cape Town international OAEA members, Dr. -
Exploring the Recovery Lakes Region and Interior Dronning Maud Land, East Antarctica, with Airborne Gravity, Magnetic and Radar Measurements
Downloaded from http://sp.lyellcollection.org/ by guest on September 29, 2021 Exploring the Recovery Lakes region and interior Dronning Maud Land, East Antarctica, with airborne gravity, magnetic and radar measurements RENE FORSBERG1*, ARNE V. OLESEN1, FAUSTO FERRACCIOLI2, TOM A. JORDAN2, KENICHI MATSUOKA3, ANDRES ZAKRAJSEK4, MARTA GHIDELLA4 & JAMIN S. GREENBAUM5 1National Space Institute, Technical University of Denmark, Lyngby, Denmark 2British Antarctic Survey, Cambridge, UK 3Norwegian Polar Institute, Tromsø, Norway 4DNA – Instituto Antartico Argentino, Buenos Aires, Argentina 5Institute of Geophysics, University of Texas, Austin, Texas, USA *Correspondence: [email protected] Abstract: Long-range airborne geophysical measurements were carried out in the ICEGRAV campaigns, covering hitherto unexplored parts of interior East Antarctica and part of the Antarctic Peninsula. The airborne surveys provided a regional coverage of gravity, magnetic and ice- penetrating radar measurements for major Dronning Maud Land ice stream systems, from the grounding lines up to the Recovery Lakes drainage basin, and filled in major data voids in Antarctic data compilations, such as AntGP for gravity data, ADMAP for magnetic data and BEDMAP2 for ice thickness data and the sub-ice topography. We present the first maps of gravity, magnetic and ice thickness data and bedrock topography for the region and show examples of bedrock topography and basal reflectivity patterns. The 2013 Recovery Lakes campaign was carried out with a British Antarctic Survey Twin Otter -
Accelerated Climate Changes in Weddell Sea Region of Antarctica Detected by Extreme Values Theory
atmosphere Article Accelerated Climate Changes in Weddell Sea Region of Antarctica Detected by Extreme Values Theory Giuseppe Prete 1,*, Vincenzo Capparelli 1, Fabio Lepreti 1,2 and Vincenzo Carbone 1,2 1 Department of Physics, University of Calabria, Ponte P. Bucci 31C, 87036 Rende (CS), Italy; [email protected] (V.C.); [email protected] (F.L.); vincenzo.carbone@fis.unical.it (V.C.) 2 National Institute for Astrophysics (INAF), Direzione Scientifica, 00100 Rome (RM), Italy * Correspondence: [email protected] Abstract: On 13 February 2020, The Guardian, followed by many other newspapers and websites, published the news that on 9 February 2020, Antarctic air temperatures rose to about 20.75 ◦C in a base logged at Seymour Island. This value has not yet been validated by the WMO (World Meteorological Organization), but it is not the first time that an extreme temperature was registered in these locations. The recorded temperatures have often been described as “abnormal and anomalous”, according to a statement made by scientists working at the Antarctic bases. Since polar regions have shown the most rapid rates of climate change in recent years, this abnormality is of primary interest in the context of vulnerability of the Antarctic to climate changes. Using data detected at different Antarctic bases, we investigate yearly maxima and minima of recorded temperatures, in order to establish whether they can be considered as usual extreme events or abnormal. We found evidence for disagreement with the extreme values theory, indicating accelerated climate changes in the Antarctic, that is, a local warming rate that is much faster than global averages. -
Waba Directory 2003
DIAMOND DX CLUB www.ddxc.net WABA DIRECTORY 2003 1 January 2003 DIAMOND DX CLUB WABA DIRECTORY 2003 ARGENTINA LU-01 Alférez de Navió José María Sobral Base (Army)1 Filchner Ice Shelf 81°04 S 40°31 W AN-016 LU-02 Almirante Brown Station (IAA)2 Coughtrey Peninsula, Paradise Harbour, 64°53 S 62°53 W AN-016 Danco Coast, Graham Land (West), Antarctic Peninsula LU-19 Byers Camp (IAA) Byers Peninsula, Livingston Island, South 62°39 S 61°00 W AN-010 Shetland Islands LU-04 Decepción Detachment (Navy)3 Primero de Mayo Bay, Port Foster, 62°59 S 60°43 W AN-010 Deception Island, South Shetland Islands LU-07 Ellsworth Station4 Filchner Ice Shelf 77°38 S 41°08 W AN-016 LU-06 Esperanza Base (Army)5 Seal Point, Hope Bay, Trinity Peninsula 63°24 S 56°59 W AN-016 (Antarctic Peninsula) LU- Francisco de Gurruchaga Refuge (Navy)6 Harmony Cove, Nelson Island, South 62°18 S 59°13 W AN-010 Shetland Islands LU-10 General Manuel Belgrano Base (Army)7 Filchner Ice Shelf 77°46 S 38°11 W AN-016 LU-08 General Manuel Belgrano II Base (Army)8 Bertrab Nunatak, Vahsel Bay, Luitpold 77°52 S 34°37 W AN-016 Coast, Coats Land LU-09 General Manuel Belgrano III Base (Army)9 Berkner Island, Filchner-Ronne Ice 77°34 S 45°59 W AN-014 Shelves LU-11 General San Martín Base (Army)10 Barry Island in Marguerite Bay, along 68°07 S 67°06 W AN-016 Fallières Coast of Graham Land (West), Antarctic Peninsula LU-21 Groussac Refuge (Navy)11 Petermann Island, off Graham Coast of 65°11 S 64°10 W AN-006 Graham Land (West); Antarctic Peninsula LU-05 Melchior Detachment (Navy)12 Isla Observatorio