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Airborne Gravimetry at the U.S. Naval Research Lab 1980-Present Mary Flather Peters Early History of NRL Airborne Program – Pre Kinematic GPS 1979 Preliminary Design of System First test of Early Prototype off Carolina Coast Jun-80 Loran C Nav RMS ~ 20 mGal 8 Flights Incorporation of GPS Nav and test off Wallops Island, VA Jun-81 RMS < 6 mGal 2 Flights 12 Flights, no Dec-83 Piggy Back Gravity on Airborne Magnetics Study East of Brazil ground truth Blind Test over Eastern NC for DMA Apr-84 Incorporation of Pressure Altimetry RMS 2.5 mGal 4 Flights 15 Flights, Data May-84 Piggy Back Gravity on Airborne Study of the Angola Basin not reduced 12 Flights, no Feb-86 NSF Funded Study of the Antarctic Margin, Airborne Gravity over Ice ground truth Eastern Seaboard Test for NSWC RMS Jun-86 Difference with NSWC Shipboard Data < 4 mGal 6 Flights Feb-87 NSF Study of Antarctic Margin Average Mis-tie 2.2 mGal 10 Flights Sep-87 NSWC Inteferometric GPS Test 6 Flights Oct-87 NSF Study of Antarctic Margin 9 Flights 1988-1989 Gravimeter, Altimeter and Computer upgrades Nov-89 NSWC/ NRL Interferometric GPS/INS tests 6 Flights Norwegian-Greenland Sea and Eurasia Basin Aeromag Profiles (1973-76) Canada and Eurasia Basin Aeromag Profiles (1972-83) P3-B (heavy) -154589 in Spitsbergen -1999 P3-A -149674, NRL Flt Sup. Det. 2nd P-3 Antarctic Geophysical Surveys Airborne Gravity, Magnetics and Surface Topo – P3, L&R − * 1985 – Rio Grande, Argentina – Weddell Sea (East of Ant Peninsula) − * 1986 – Punta Arenas, Chile – Weddell Sea (East of Ant Peninsula) − * 1987 – Punta Arenas, Chile – Bellingshausen Sea (West of Ant Peninsula) Airborne Gravity, Topo Lidar, Ice Thickness Radar, Magnetics – Twin Otter, BGM ⁻ * 1991-1992 Central West Antarctic 9 NSF Study of Antarctic Margin Average Mis-tie 2.2 mGal Kinematic GPS Era Greenland Aerogeophysics Project 1991, 1992 Greenland Gravity Canada and Eurasia Basin Aerograv/mag Tracks (1992-99) Arctic Aerograv Rampant Lion Project Afghanistan 2006, 2008 Rampant Lion Project Afghanistan 2006, 2008 Rampant Lion Project Afghanistan 2006, 2008 .

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The Antarctic Coastal Current in the Bellingshausen Sea
The Cryosphere, 15, 4179–4199, 2021 https://doi.org/10.5194/tc-15-4179-2021 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. The Antarctic Coastal Current in the Bellingshausen Sea Ryan Schubert1, Andrew F. Thompson3, Kevin Speer1, Lena Schulze Chretien4, and Yana Bebieva1,2 1Geophysical Fluid Dynamics Institute, Florida State University, Tallahassee, Florida 32306, USA 2Department of Scientiﬁc Computing, Florida State University, Tallahassee, Florida 32306, USA 3Environmental Science and Engineering, California Institute of Technology, Pasadena, CA 91125, USA 4Department of Biology and Marine Science, Marine Science Research Institute, Jacksonville University, Jacksonville, Florida, USA Correspondence: Ryan Schubert ([email protected]) Received: 4 February 2021 – Discussion started: 19 February 2021 Revised: 20 July 2021 – Accepted: 21 July 2021 – Published: 1 September 2021 Abstract. The ice shelves of the West Antarctic Ice Sheet 1 Introduction experience basal melting induced by underlying warm, salty Circumpolar Deep Water. Basal meltwater, along with runoff from ice sheets, supplies fresh buoyant water to a circula- The Antarctic continental slope in West Antarctica, spanning tion feature near the coast, the Antarctic Coastal Current the West Antarctic Peninsula (WAP) to the western Amund- (AACC). The formation, structure, and coherence of the sen Sea, is characterized by a shoaling of the subsurface tem- AACC has been well documented along the West Antarc- perature maximum, which allows warm, salty Circumpolar tic Peninsula (WAP). Observations from instrumented seals Deep Water (CDW) greater access to the continental shelf. collected in the Bellingshausen Sea offer extensive hydro- This leads to an increase in the oceanic heat content over the graphic coverage throughout the year, providing evidence of shelf in this region compared to other Antarctic shelf seas the continuation of the westward ﬂowing AACC from the (Schmidtko et al., 2014).
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Federal Register/Vol. 86, No. 147/Wednesday, August 4, 2021
Federal Register / Vol. 86, No. 147 / Wednesday, August 4, 2021 / Proposed Rules 41917 Bureau at (202) 418–0530 (VOICE), (202) Community Channel No. (1) Electronically: Go to the Federal 418–0432 (TTY). eRulemaking Portal: http:// This document does not contain www.regulations.gov. In the Search box, information collection requirements ***** enter FWS–HQ–ES–2021–0043, which subject to the Paperwork Reduction Act is the docket number for this of 1995, Public Law 104–13. In addition, NEVADA rulemaking. Then, click on the Search therefore, it does not contain any button. On the resulting page, in the proposed information collection burden ***** Search panel on the left side of the ‘‘for small business concerns with fewer Henderson ............................ 24 screen, under the Document Type than 25 employees,’’ pursuant to the heading, check the Proposed Rule box to Small Business Paperwork Relief Act of ***** locate this document. You may submit 2002, Public Law 107–198, see 44 U.S.C. a comment by clicking on ‘‘Comment.’’ 3506(c)(4). Provisions of the Regulatory [FR Doc. 2021–16589 Filed 8–3–21; 8:45 am] (2) By hard copy: Submit by U.S. mail Flexibility Act of 1980, 5 U.S.C. 601– BILLING CODE 6712–01–P to: Public Comments Processing, Attn: 612, do not apply to this proceeding. FWS–HQ–ES–2021–0043, U.S. Fish and Members of the public should note Wildlife Service, MS: PRB/3W, 5275 that all ex parte contacts are prohibited DEPARTMENT OF THE INTERIOR Leesburg Pike, Falls Church, VA 22041– from the time a Notice of Proposed 3803.
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Variability in Cenozoic Sedimentation Along the Continental Rise of the Bellingshausen Sea, West Antarctica ⁎ Carsten Scheuer A, , Karsten Gohl A, Robert D
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Electronic Publication Information Center Marine Geology 227 (2006) 279–298 www.elsevier.com/locate/margeo Variability in Cenozoic sedimentation along the continental rise of the Bellingshausen Sea, West Antarctica ⁎ Carsten Scheuer a, , Karsten Gohl a, Robert D. Larter b, Michele Rebesco c, Gleb Udintsev d a Alfred Wegener Institute for Polar and Marine Research (AWI), Postfach 120161, D-27515, Bremerhaven, Germany b British Antarctic Survey (BAS), High Cross, Madingley Road, Cambridge CB3 OET, UK c Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/C, 34010 Sconico (TS), Italy d Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19, Kosygin Str, 117975 Moscow, Russia Received 29 September 2004; received in revised form 16 December 2005; accepted 21 December 2005 Abstract Seismic reflection profiles, bathymetric and magnetic data collected along and across the continental margin of the Bellingshausen Sea provide new constraints and interpretations of the oceanic basement structure and Cenozoic glacial history of West Antarctica. Evidence for tectonic boundaries that lie perpendicular to the margin has been identified on the basis of one previously unpublished along-slope multichannel seismic reflection profile. By combining several magnetic data sets, we determined basement ages and verified the positions of possible fracture zones, enabling us to improve previous tectonic and stratigraphic models. We establish three main sediment units on the basis of one seismic along-slope profile and by correlation to the continental shelf via one cross-slope profile. We interpret a lowermost unit, Be3 (older then 9.6 Ma), as representing a long period of slow accumulation of mainly turbiditic sediments.
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Ice Core Records of 20Th Century Sea Ice Decline in the Bellingshausen Sea, Geophysical Research Letters, Submitted
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The Larsen Ice Shelf System, Antarctica
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Southern Elephant Seal Movements and Antarctic Sea Ice H
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Iii. Diatom Phytoplankton Studies in the Southern Pacific Ocean, Composition and Correlation to the Antarctic Convergence and Its Paleoecological Significance
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