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National Life Stories an Oral History of British
NATIONAL LIFE STORIES AN ORAL HISTORY OF BRITISH SCIENCE Professor Bob Dickson Interviewed by Dr Paul Merchant C1379/56 © The British Library Board http://sounds.bl.uk This interview and transcript is accessible via http://sounds.bl.uk . © The British Library Board. Please refer to the Oral History curators at the British Library prior to any publication or broadcast from this document. Oral History The British Library 96 Euston Road London NW1 2DB United Kingdom +44 (0)20 7412 7404 [email protected] Every effort is made to ensure the accuracy of this transcript, however no transcript is an exact translation of the spoken word, and this document is intended to be a guide to the original recording, not replace it. Should you find any errors please inform the Oral History curators. © The British Library Board http://sounds.bl.uk British Library Sound Archive National Life Stories Interview Summary Sheet Title Page Ref no: C1379/56 Collection title: An Oral History of British Science Interviewee’s surname: Dickson Title: Professor Interviewee’s forename: Bob Sex: Male Occupation: oceanographer Date and place of birth: 4th December, 1941, Edinburgh, Scotland Mother’s occupation: Housewife , art Father’s occupation: Schoolmaster teacher (part time) [chemistry] Dates of recording, Compact flash cards used, tracks [from – to]: 9/8/11 [track 1-3], 16/12/11 [track 4- 7], 28/10/11 [track 8-12], 14/2/13 [track 13-15] Location of interview: CEFAS [Centre for Environment, Fisheries & Aquaculture Science], Lowestoft, Suffolk Name of interviewer: Dr Paul Merchant Type of recorder: Marantz PMD661 Recording format : 661: WAV 24 bit 48kHz Total no. -
Fronts in the World Ocean's Large Marine Ecosystems. ICES CM 2007
- 1 - This paper can be freely cited without prior reference to the authors International Council ICES CM 2007/D:21 for the Exploration Theme Session D: Comparative Marine Ecosystem of the Sea (ICES) Structure and Function: Descriptors and Characteristics Fronts in the World Ocean’s Large Marine Ecosystems Igor M. Belkin and Peter C. Cornillon Abstract. Oceanic fronts shape marine ecosystems; therefore front mapping and characterization is one of the most important aspects of physical oceanography. Here we report on the first effort to map and describe all major fronts in the World Ocean’s Large Marine Ecosystems (LMEs). Apart from a geographical review, these fronts are classified according to their origin and physical mechanisms that maintain them. This first-ever zero-order pattern of the LME fronts is based on a unique global frontal data base assembled at the University of Rhode Island. Thermal fronts were automatically derived from 12 years (1985-1996) of twice-daily satellite 9-km resolution global AVHRR SST fields with the Cayula-Cornillon front detection algorithm. These frontal maps serve as guidance in using hydrographic data to explore subsurface thermohaline fronts, whose surface thermal signatures have been mapped from space. Our most recent study of chlorophyll fronts in the Northwest Atlantic from high-resolution 1-km data (Belkin and O’Reilly, 2007) revealed a close spatial association between chlorophyll fronts and SST fronts, suggesting causative links between these two types of fronts. Keywords: Fronts; Large Marine Ecosystems; World Ocean; sea surface temperature. Igor M. Belkin: Graduate School of Oceanography, University of Rhode Island, 215 South Ferry Road, Narragansett, Rhode Island 02882, USA [tel.: +1 401 874 6533, fax: +1 874 6728, email: [email protected]]. -
Itinerary Route: Reykjavik, Iceland to Reykjavik, Iceland
ICELAND AND GREENLAND: WILD COASTS AND ICY SHORES Itinerary route: Reykjavik, Iceland to Reykjavik, Iceland 13 Days Expeditions in: Aug Call us at 1.800.397.3348 or call your Travel Agent. In Australia, call 1300.361.012 • www.expeditions.com DAY 1: Reykjavik, Iceland / Embark padding Special Offers Arrive in Reykjavík, the world’s northernmost capital, which lies only a fraction below the Arctic Circle and receives just four hours of sunlight in FREE BAR TAB AND CREW winter and 22 in summer. Check in to our group TIPS INCLUDED hotel in the morning and take time to rest and We will cover your bar tab and all tips for refresh before lunch. In the afternoon, take a the crew on all National Geographic panoramic drive through the city’s Old Town Resolution, National Geographic before embarking National Explorer, National Geographic Geographic Endurance. (B,L,D) Endurance, and National Geographic Orion voyages. DAY 2: Flatey Island padding Explore Iceland’s western frontier by Zodiac cruise, visiting Flatey Island, a trading post for many centuries. In the afternoon, sail past the wild and scenic coast of Iceland’s Westfjords region. (B,L,D) DAY 3: Arnafjörður and Dynjandi Waterfall padding In the early morning our ship will glide into beautiful Arnafjörður along the northwest coast of Iceland. For a more active experience, disembark early and hike several miles along the base of the fjord to visit spectacular Dynjandi Waterfall. Alternatively, join our expedition staff on the bow of the ship as we venture ever deeper into the fjord and then go ashore by Zodiac to walk up to the base of the waterfall. -
Marine Debris in the Coastal Environment of Iceland´S Nature Reserve, Hornstrandir - Sources, Consequences and Prevention Measures
Master‘s thesis Marine Debris in the Coastal Environment of Iceland´s Nature Reserve, Hornstrandir - Sources, Consequences and Prevention Measures Anna-Theresa Kienitz Advisor: Hrönn Ólína Jörundsdóttir University of Akureyri Faculty of Business and Science University Centre of the Westfjords Master of Resource Management: Coastal and Marine Management Ísafjörður, May 2013 Supervisory Committee Advisor: Hrönn Ólína Jörundsdóttir Ph.D Matis Ltd. Food and Biotech Vinlandsteid 12, 143 Rekavík Reader: Dr. Helgi Jensson Ráðgjafi, Senior consultant Skrifstofa forstjóra, Human Resources Secretariat Program Director: Dagný Arnarsdóttir, MSc. Academic Director of Coastal and Marine Management Anna-Theresa Kienitz Marine Debris in the Coastal Environment of Iceland´s Nature Reserve, Hornstrandir - Sources, Consequences and Prevention Measures 45 ECTS thesis submitted in partial fulfilment of a Master of Resource Management degree in Coastal and Marine Management at the University Centre of the Westfjords, Suðurgata 12, 400 Ísafjörður, Iceland Degree accredited by the University of Akureyri, Faculty of Business and Science, Borgir, 600 Akureyri, Iceland Copyright © 2013 Anna-Theresa Kienitz All rights reserved Printing: Háskólaprent, May 2013 Declaration I hereby confirm that I am the sole author of this thesis and it is a product of my own academic research. ________________________ Theresa Kienitz Abstract Marine debris is a growing problem, which adversely affects ecosystems and economies world-wide. Studies based on a standardized approach to examine the quantity of marine debris are lacking at many locations, including Iceland. In the present study, 26 transects were established on six different bays in the north, west and south of the nature reserve Hornstrandir in Iceland, following the standardized approach developed by the OSPAR Commission. -
Eddy-Driven Recirculation of Atlantic Water in Fram Strait
PUBLICATIONS Geophysical Research Letters RESEARCH LETTER Eddy-driven recirculation of Atlantic Water in Fram Strait 10.1002/2016GL068323 Tore Hattermann1,2, Pål Erik Isachsen3,4, Wilken-Jon von Appen2, Jon Albretsen5, and Arild Sundfjord6 Key Points: 1Akvaplan-niva AS, High North Research Centre, Tromsø, Norway, 2Alfred Wegener Institute, Helmholtz Centre for Polar and • fl Seasonally varying eddy-mean ow 3 4 interaction controls recirculation of Marine Research, Bremerhaven, Germany, Norwegian Meteorological Institute, Oslo, Norway, Institute of Geosciences, 5 6 Atlantic Water in Fram Strait University of Oslo, Oslo, Norway, Institute for Marine Research, Bergen, Norway, Norwegian Polar Institute, Tromsø, Norway • The bulk recirculation occurs in a cyclonic gyre around the Molloy Hole at 80 degrees north Abstract Eddy-resolving regional ocean model results in conjunction with synthetic float trajectories and • A colder westward current south of observations provide new insights into the recirculation of the Atlantic Water (AW) in Fram Strait that 79 degrees north relates to the Greenland Sea Gyre, not removing significantly impacts the redistribution of oceanic heat between the Nordic Seas and the Arctic Ocean. The Atlantic Water from the slope current simulations confirm the existence of a cyclonic gyre around the Molloy Hole near 80°N, suggesting that most of the AW within the West Spitsbergen Current recirculates there, while colder AW recirculates in a Supporting Information: westward mean flow south of 79°N that primarily relates to the eastern rim of the Greenland Sea Gyre. The • Supporting Information S1 fraction of waters recirculating in the northern branch roughly doubles during winter, coinciding with a • Movie S1 seasonal increase of eddy activity along the Yermak Plateau slope that also facilitates subduction of AW Correspondence to: beneath the ice edge in this area. -
The East Greenland Current North of Denmark Strait: Part I'
The East Greenland Current North of Denmark Strait: Part I' K. AAGAARD AND L. K. COACHMAN2 ABSTRACT.Current measurements within the East Greenland Current during winter1965 showed that above thecontinental slope there were large on-shore components of flow, probably representing a westward Ekman transport. The speed did not decrease significantly with depth, indicatingthat the barotropic mode domi- nates the flow. Typical current speeds were10 to 15 cm. sec.-l. The transport of the current during winter exceeds 35 x 106 m.3 sec-1. This is an order of magnitude greater than previous estimates and, although there may be seasonal fluctuations in the transport, it suggests that the East Greenland Current primarily represents a circulation internal to the Greenland and Norwegian seas, rather than outflow from the central Polarbasin. RESUME. Lecourant du Groenland oriental au nord du dbtroit de Danemark. Aucours de l'hiver de 1965, des mesures effectukes danslecourant du Groenland oriental ont montr6 que sur le talus continental, la circulation comporte d'importantes composantes dirigkes vers le rivage, ce qui reprksente probablement un flux vers l'ouest selon le mouvement #Ekman. La vitesse ne diminue pas beau- coup avec laprofondeur, ce qui indique que le mode barotropique domine la circulation. Les vitesses typiques du courant sont de 10 B 15 cm/s-1. Au cows de l'hiver, le debit du courant dkpasse 35 x 106 m3/s-1. Cet ordre de grandeur dkpasse les anciennes estimations et, malgrC les fluctuations saisonnihres possibles, il semble que le courant du Groenland oriental correspond surtout B une circulation interne des mers du Groenland et de Norvhge, plut6t qu'8 un Bmissaire du bassin polaire central. -
Representation of the Denmark Strait Overflow in a Z-Coordinate Eddying
Geosci. Model Dev., 13, 3347–3371, 2020 https://doi.org/10.5194/gmd-13-3347-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Representation of the Denmark Strait overflow in a z-coordinate eddying configuration of the NEMO (v3.6) ocean model: resolution and parameter impacts Pedro Colombo1, Bernard Barnier1,4, Thierry Penduff1, Jérôme Chanut2, Julie Deshayes3, Jean-Marc Molines1, Julien Le Sommer1, Polina Verezemskaya4, Sergey Gulev4, and Anne-Marie Treguier5 1Institut des Géosciences de l’Environnement, CNRS-UGA, Grenoble, 38050, France 2Mercator Ocean International, Ramonville Saint-Agne, France 3Sorbonne Universités (UPMC, Univ Paris 06)-CNRS-IRD-MNHN, LOCEAN Laboratory, Paris, France 4P. P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia 5Laboratoire d’Océanographie Physique et Spatiale, Brest, France Correspondence: Pedro Colombo ([email protected]) Received: 23 September 2019 – Discussion started: 14 January 2020 Revised: 26 May 2020 – Accepted: 9 June 2020 – Published: 30 July 2020 Abstract. We investigate in this paper the sensitivity of the players contribute to the sinking of the overflow: the break- representation of the Denmark Strait overflow produced by a ing of the overflow into boluses of dense water which con- regional z-coordinate configuration of NEMO (version 3.6) tribute to spreading the overflow waters along the Greenland to the horizontal and vertical grid resolutions and to various shelf and within the Irminger Basin, and the resolved verti- numerical and physical parameters. Three different horizon- cal shear that results from the resolution of the bottom Ek- tal resolutions, 1=12, 1=36, and 1=60◦, are respectively used man boundary layer dynamics. -
On the Connection Between the Mediterranean Outflow and The
FEBRUARY 2001 OÈ ZGOÈ KMEN ET AL. 461 On the Connection between the Mediterranean Out¯ow and the Azores Current TAMAY M. OÈ ZGOÈ KMEN,ERIC P. C HASSIGNET, AND CLAES G. H. ROOTH RSMAS/MPO, University of Miami, Miami, Florida (Manuscript received 18 August 1999, in ®nal form 19 April 2000) ABSTRACT As the salty and dense Mediteranean over¯ow exits the Strait of Gibraltar and descends rapidly in the Gulf of Cadiz, it entrains the fresher overlying subtropical Atlantic Water. A minimal model is put forth in this study to show that the entrainment process associated with the Mediterranean out¯ow in the Gulf of Cadiz can impact the upper-ocean circulation in the subtropical North Atlantic Ocean and can be a fundamental factor in the establishment of the Azores Current. Two key simpli®cations are applied in the interest of producing an eco- nomical model that captures the dominant effects. The ®rst is to recognize that in a vertically asymmetric two- layer system, a relatively shallow upper layer can be dynamically approximated as a single-layer reduced-gravity controlled barotropic system, and the second is to apply quasigeostrophic dynamics such that the volume ¯ux divergence effect associated with the entrainment is represented as a source of potential vorticity. Two sets of computations are presented within the 1½-layer framework. A primitive-equation-based com- putation, which includes the divergent ¯ow effects, is ®rst compared with the equivalent quasigeostrophic formulation. The upper-ocean cyclonic eddy generated by the loss of mass over a localized area elongates westward under the in¯uence of the b effect until the ¯ow encounters the western boundary. -
Surface Circulation2016
OCN 201 Surface Circulation Excess heat in equatorial regions requires redistribution toward the poles 1 In the Northern hemisphere, Coriolis force deflects movement to the right In the Southern hemisphere, Coriolis force deflects movement to the left Combination of atmospheric cells and Coriolis force yield the wind belts Wind belts drive ocean circulation 2 Surface circulation is one of the main transporters of “excess” heat from the tropics to northern latitudes Gulf Stream http://earthobservatory.nasa.gov/Newsroom/NewImages/Images/gulf_stream_modis_lrg.gif 3 How fast ( in miles per hour) do you think western boundary currents like the Gulf Stream are? A 1 B 2 C 4 D 8 E More! 4 mph = C Path of ocean currents affects agriculture and habitability of regions ~62 ˚N Mean Jan Faeroe temp 40 ˚F Islands ~61˚N Mean Jan Anchorage temp 13˚F Alaska 4 Average surface water temperature (N hemisphere winter) Surface currents are driven by winds, not thermohaline processes 5 Surface currents are shallow, in the upper few hundred metres of the ocean Clockwise gyres in North Atlantic and North Pacific Anti-clockwise gyres in South Atlantic and South Pacific How long do you think it takes for a trip around the North Pacific gyre? A 6 months B 1 year C 10 years D 20 years E 50 years D= ~ 20 years 6 Maximum in surface water salinity shows the gyres excess evaporation over precipitation results in higher surface water salinity Gyres are underneath, and driven by, the bands of Trade Winds and Westerlies 7 Which wind belt is Hawaii in? A Westerlies B Trade -
Lagrangian Perspective on the Origins of Denmark Strait Overflow
AUGUST 2020 S A B E R I E T A L . 2393 Lagrangian Perspective on the Origins of Denmark Strait Overflow ATOUSA SABERI,THOMAS W. N. HAINE, AND RENSKE GELDERLOOS Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, Maryland M. FEMKE DE JONG Royal Netherlands Institute for Sea Research, and Utrecht University, Texel, Netherlands HEATHER FUREY AND AMY BOWER Woods Hole Oceanographic Institution, Woods Hole, Massachusetts (Manuscript received 1 September 2019, in final form 16 June 2020) ABSTRACT The Denmark Strait Overflow (DSO) is an important contributor to the lower limb of the Atlantic me- ridional overturning circulation (AMOC). Determining DSO formation and its pathways is not only im- portant for local oceanography but also critical to estimating the state and variability of the AMOC. Despite prior attempts to understand the DSO sources, its upstream pathways and circulation remain uncertain due to short-term (3–5 days) variability. This makes it challenging to study the DSO from observations. Given this complexity, this study maps the upstream pathways and along-pathway changes in its water properties, using Lagrangian backtracking of the DSO sources in a realistic numerical ocean simulation. The Lagrangian pathways confirm that several branches contribute to the DSO from the north such as the East Greenland Current (EGC), the separated EGC (sEGC), and the North Icelandic Jet (NIJ). Moreover, the model results reveal additional pathways from south of Iceland, which supplied over 16% of the DSO annually and over 25% of the DSO during winter of 2008, when the NAO index was positive. The southern contribution is about 34% by the end of March. -
Lecture 4: OCEANS (Outline)
LectureLecture 44 :: OCEANSOCEANS (Outline)(Outline) Basic Structures and Dynamics Ekman transport Geostrophic currents Surface Ocean Circulation Subtropicl gyre Boundary current Deep Ocean Circulation Thermohaline conveyor belt ESS200A Prof. Jin -Yi Yu BasicBasic OceanOcean StructuresStructures Warm up by sunlight! Upper Ocean (~100 m) Shallow, warm upper layer where light is abundant and where most marine life can be found. Deep Ocean Cold, dark, deep ocean where plenty supplies of nutrients and carbon exist. ESS200A No sunlight! Prof. Jin -Yi Yu BasicBasic OceanOcean CurrentCurrent SystemsSystems Upper Ocean surface circulation Deep Ocean deep ocean circulation ESS200A (from “Is The Temperature Rising?”) Prof. Jin -Yi Yu TheThe StateState ofof OceansOceans Temperature warm on the upper ocean, cold in the deeper ocean. Salinity variations determined by evaporation, precipitation, sea-ice formation and melt, and river runoff. Density small in the upper ocean, large in the deeper ocean. ESS200A Prof. Jin -Yi Yu PotentialPotential TemperatureTemperature Potential temperature is very close to temperature in the ocean. The average temperature of the world ocean is about 3.6°C. ESS200A (from Global Physical Climatology ) Prof. Jin -Yi Yu SalinitySalinity E < P Sea-ice formation and melting E > P Salinity is the mass of dissolved salts in a kilogram of seawater. Unit: ‰ (part per thousand; per mil). The average salinity of the world ocean is 34.7‰. Four major factors that affect salinity: evaporation, precipitation, inflow of river water, and sea-ice formation and melting. (from Global Physical Climatology ) ESS200A Prof. Jin -Yi Yu Low density due to absorption of solar energy near the surface. DensityDensity Seawater is almost incompressible, so the density of seawater is always very close to 1000 kg/m 3. -
Global Ocean Surface Velocities from Drifters: Mean, Variance, El Nino–Southern~ Oscillation Response, and Seasonal Cycle Rick Lumpkin1 and Gregory C
JOURNAL OF GEOPHYSICAL RESEARCH: OCEANS, VOL. 118, 2992–3006, doi:10.1002/jgrc.20210, 2013 Global ocean surface velocities from drifters: Mean, variance, El Nino–Southern~ Oscillation response, and seasonal cycle Rick Lumpkin1 and Gregory C. Johnson2 Received 24 September 2012; revised 18 April 2013; accepted 19 April 2013; published 14 June 2013. [1] Global near-surface currents are calculated from satellite-tracked drogued drifter velocities on a 0.5 Â 0.5 latitude-longitude grid using a new methodology. Data used at each grid point lie within a centered bin of set area with a shape defined by the variance ellipse of current fluctuations within that bin. The time-mean current, its annual harmonic, semiannual harmonic, correlation with the Southern Oscillation Index (SOI), spatial gradients, and residuals are estimated along with formal error bars for each component. The time-mean field resolves the major surface current systems of the world. The magnitude of the variance reveals enhanced eddy kinetic energy in the western boundary current systems, in equatorial regions, and along the Antarctic Circumpolar Current, as well as three large ‘‘eddy deserts,’’ two in the Pacific and one in the Atlantic. The SOI component is largest in the western and central tropical Pacific, but can also be seen in the Indian Ocean. Seasonal variations reveal details such as the gyre-scale shifts in the convergence centers of the subtropical gyres, and the seasonal evolution of tropical currents and eddies in the western tropical Pacific Ocean. The results of this study are available as a monthly climatology. Citation: Lumpkin, R., and G.