33 research outputs found
Meshing Deforming Spacetime for Visualization and Analysis
We introduce a novel paradigm that simplifies the visualization and analysis
of data that have a spatially/temporally varying frame of reference. The
primary application driver is tokamak fusion plasma, where science variables
(e.g., density and temperature) are interpolated in a complex magnetic
field-line-following coordinate system. We also see a similar challenge in
rotational fluid mechanics, cosmology, and Lagrangian ocean analysis; such
physics implies a deforming spacetime and induces high complexity in volume
rendering, isosurfacing, and feature tracking, among various visualization
tasks. Without loss of generality, this paper proposes an algorithm to build a
simplicial complex -- a tetrahedral mesh, for the deforming 3D spacetime
derived from two 2D triangular meshes representing consecutive timesteps.
Without introducing new nodes, the resulting mesh fills the gap between 2D
meshes with tetrahedral cells while satisfying given constraints on how nodes
connect between the two input meshes. In the algorithm we first divide the
spacetime into smaller partitions to reduce complexity based on the input
geometries and constraints. We then independently search for a feasible
tessellation of each partition taking nonconvexity into consideration. We
demonstrate multiple use cases for a simplified visualization analysis scheme
with a synthetic case and fusion plasma applications
Copernicus Marine Service ocean state report, issue 4
This is the final version. Available from Taylor & Francis via the DOI in this record. FCT/MCTE
Proceedings of the Workshop on the Okhotsk Sea and Adjacent Areas [Vladivostok, June 1995]
I REPORT OF THE PICES WORKSHOP ON THE OKHOTSK SEA AND ADJACENT AREAS (pdf, 0.1 Mb)
1. Outline of the workshop
2. Summary reports from sessions
3. Recommendations of the workshop
4. Acknowledgments
II SCIENTIFIC PAPERS SUBMITTED FROM SESSIONS
1. Physical Oceanography Sessions (pdf, 4 Mb)
A. Circulation and water mass structure of the Okhotsk Sea and Northwestern Pacific
Valentina D. Budaeva & Vyacheslav G. Makarov
Seasonal variability of the pycnocline in La Perouse Strait and Aniva Gulf
Valentina D. Budaeva & Vyacheslav G. Makarov
Modeling of the typical water circulations in the La Perouse Strait and Aniva Gulf region
Nina A. Dashko, Sergey M. Varlamov, Young-Ho Han & Young-Seup Kim
Anticyclogenesis over the Okhotsk Sea and its influence on weather
Boris S. Dyakov, Alexander A. Nikitin & Vadim P. Pavlychev
Research of water structure and dynamics in the Okhotsk Sea and adjacent Pacific
Howard J. Freeland, Alexander S. Bychkov, C.S. Wong, Frank A. Whitney & Gennady I. Yurasov
The Ohkotsk Sea component of Pacific Intermediate Water
Emil E. Herbeck, Anatoly I. Alexanin, Igor A. Gontcharenko, Igor I. Gorin, Yury V. Naumkin & Yury G. Proshjants
Some experience of the satellite environmental support of marine expeditions at the Far East Seas
Alexander A. Karnaukhov
The tidal influence on the Sakhalin shelf hydrology
Yasuhiro Kawasaki
On the formation process of the subsurface mixed water around the Central Kuril Islands
Lloyd D. Keigwin
Northwest Pacific paleohydrography
Talgat R. Kilmatov
Physical mechanisms for the North Pacific Intermediate Water formation
Vladimir A. Luchin
Water masses in the Okhotsk Sea
Andrey V. Martynov, Elena N. Golubeva & Victor I. Kuzin
Numerical experiments with finite element model of the Okhotsk Sea circulation
Nikolay A. Maximenko, Anatoly I. Kharlamov & Raissa I. Gouskina
Structure of Intermediate Water layer in the Northwest Pacific
Nikolay A. Maximenko & Andrey Yu. Shcherbina
Fine-structure of the North Pacific Intermediate Water layer
Renat D. Medjitov & Boris I. Reznikov
An experimental study of water transport through the Straits of Okhotsk Sea by electromagnetic method
Valentina V. Moroz
Oceanological zoning of the Kuril Islands area in the spring-summer period
Yutaka Nagata
Note on the salinity balance in the Okhotsk Sea
Alexander D. Nelezin
Variability of the Kuroshio Front in 1965-1991
Vladimir I. Ponomarev, Evgeny P. Varlaty & Mikhail Yu. Cheranyev
An experimental study of currents in the near-Kuril region of the Pacific Ocean and in the Okhotsk Sea
Stephen C. Riser, Gennady I. Yurasov & Mark J. Warner
Hydrographic and tracer measurements of the water mass structure and transport in the Okhotsk Sea in early spring
Konstantin A. Rogachev & Andrey V. Verkhunov
Circulation and water mass structure in the southern Okhotsk Sea, as observed in summer, 1994
Lynne D. Talley
North Pacific Intermediate Water formation and the role of the Okhotsk Sea
Anatoly S. Vasiliev & Fedor F. Khrapchenkov
Seasonal variability of integral water circulation in the Okhotsk Sea
B. Sea ice and its relation to circulation and climate
V.P. Gavrilo, G.A. Lebedev & A.P. Polyakov
Acoustic methods in sea ice dynamics studies
Nina M. Pestereva & Larisa A. Starodubtseva
The role of the Far-East atmospheric circulation in the formation of the ice cover in the Okhotsk Sea
Yoshihiko Sekine
Anomalous Oyashio intrusion and its teleconnection with Subarctic North Pacific circulation, sea ice of the Okhotsk Sea and air temperature of the northern Asian continent
C. Waves and tides
Vladimir A. Luchin
Characteristics of the tidal motions in the Kuril Straits
George V. Shevtchenko
On seasonal variability of tidal constants in the northwestern part of the Okhotsk Sea
D. Physical oceanography of the Japan Sea/East Sea
Mikhail A. Danchenkov, Kuh Kim, Igor A. Goncharenko & Young-Gyu Kim
A “chimney” of cold salt waters near Vladivostok
Christopher N.K. Mooers & Hee Sook Kang
Preliminary results from a numerical circulation model of the Japan Sea
Lev P. Yakunin
Influence of ice production on the deep water formation in the Japan Sea
2. Fisheries and Biology Sessions (pdf, 2.8 Mb)
A. Communities of the Okhotsk Sea and adjacent waters: composition, structure and dynamics
Lubov A. Balkonskaya
Exogenous succession of the southwestern Sakhalin algal communities
Tatyana A. Belan, Yelena V. Oleynik, Alexander V. Tkalin & Tat’yana S. Lishavskaya
Characteristics of pelagic and benthic communities on the North Sakhalin Island shelf
Lev N. Bocharov & Vladimir K. Ozyorin
Fishery and oceanographic database of Okhotsk Sea
Victor V. Lapko
Interannual dynamics of the epipelagic ichthyocen structure in the Okhotsk Sea
Valentina I. Lapshina
Quantitative seasonal and year-to-year changes of phytoplankton in the Okhotsk Sea and off Kuril area of the Pacific
Lyudmila N. Luchsheva
Biological productivity in anomalous mercury conditions (northern part of Okhotsk Sea)
Inna A. Nemirovskaya
Origin of hydrocarbons in the ecosystems of coastal region of the Okhotsk Sea
Tatyana A. Shatilina
Elements of the Pacific South Kuril area ecosystem
Vyacheslav P. Shuntov & Yelena P. Dulepova
Biota of the Okhotsk Sea: Structure of communities, the interannual dynamics and current status
B. Abundance, distribution, dynamics of the common fishes of the Okhotsk Sea
Yuri P. Diakov
Influence of some abiotic factors on spatial population dynamics of the West Kamchatka flounders (Pleuronectidae)
Gordon A. McFarlane, Richard J. Beamish & Larisa M. Zverkova
An examination of age estimates of walleye pollock (Theragra chalcogramma) from the Sea of Okhotsk using the burnt otolith method and implications for stock assessment and management
Larisa P. Nikolenko
Migration of Greenland turbot (Reinhardtius hippoglossoides) in the Okhotsk Sea
Galina M. Pushnikova
Fisheries impact on the Sakhalin-Hokkaido herring population
Vidar G. Wespestad
Is pollock overfished?
C. Salmon of the Okhotsk Sea: biology, abundance and stock identification
Vladimir A. Belyaev, Alexander Yu. Zhigalin
Epipelagic Far Eastern sardine of the Okhotsk Sea
Yuri E. Bregman, Victor V. Pushnikov, Lyudmila G. Sedova & Vladimir Ph. Ivanov
A preliminary report on stock status and productive capacity of horsehair crab Erimacrus isenbeckii (Brandt) in the South Kuril Strait
Natalia T. Dolganova
Mezoplankton distribution in the West Japan Sea
Vladimir V. Efremov, Richard L. Wilmot, Christine M. Kondzela, Natalia V. Varnavskaya, Sharon L. Hawkins & Maria E. Malinina
Application of pink and chum salmon genetic baseline to fishery management
Vyacheslav N. Ivankov & Valentina V. Andreyeva
Strategy for culture, breeding and numerous dynamics of Sakhalin salmon populations
Alla M. Kovalevskaya, Natalia I. Savelyeva & Dmitry M. Polyakov
Primary production in Sakhalin shelf waters
Tatyana N. Krupnova
Some reasons for resource reduction of Laminaria japonica (Primorye region)
Lyudmila N. Luchsheva & Anatoliy I. Botsul
Mercury in bottom sediments of the northeastern Okhotsk Sea
Pavel A. Luk’yanov, Natalia I. Belogortseva, Alexander A. Bulgakov, Alexander A. Kurika & Olga D. Novikova
Lectins and glycosidases from marine macro and micro-organisms of Japan and Okhotsk Seas
Boris A. Malyarchuk, Olga A. Radchenko, Miroslava V. Derenko, Andrey G. Lapinski & Leonid L. Solovenchuk
PCR-fingerprinting of mitochondrial genome of chum salmon, Oncorhynchus keta
Alexander A. Mikheev
Chaos and relaxation in dynamics of the pink salmon (Oncorhynchus gorbuscha) returns for two regions
Yuri A. Mitrofanov & Larisa N. Lesnikova
Fish-culture of Pacific Salmons increases the number of heredity defects
Larisa P. Nikolenko
Abundance of young halibut along the West Kamchatka shelf in 1982-1992
Sergey A. Nizyaev
Living conditions of golden king crab Lithodes aequispina in the Okhotsk Sea and near the Kuril Islands
Ludmila A. Pozdnyakova & Alla V. Silina
Settlements of Japanese scallop in Reid Pallada Bay (Sea of Japan)
Galina M. Pushnikova
Features of the Southwest Okhotsk Sea herring
Vladimir I. Radchenko & Igor I. Glebov
Present state of the Okhotsk herring stock and fisheries outlook
Alla V. Silina & Ida I. Ovsyannikova
Distribution of the barnacle Balanus rostratus eurostratus near the coasts of Primorye (Sea of Japan)
Galina I. Victorovskaya
Dependence of urchin Strongylocentrotus intermedius reproduction on water temperature
Anatoly F. Volkov, Alexander Y. Efimkin & Valery I. Chuchukalo
Feeding habits of Pacific salmon in the Sea of Okhotsk and in the Pacific waters of Kuril Islands in summer 1993
Larisa M. Zverkova & Georgy A. Oktyabrsky
Okhotsk Sea walleye pollock stock status
Tatyana N. Zvyagintseva, Elena V. Sundukova, Natalia M. Shevchenko & Ludmila A. Elyakova
Water soluble polysaccharides of some Far-Eastern seaweeds
3. Biodiversity Program (pdf, 0.2 Mb)
A. Biodiversity of island ecosystems and seasides of the North Pacific
Larissa A. Gayko
Productivity of Japanese scallop Patinopecten yessoensis (IAY) culture in Posieta Bay (Sea of Japan)
III APPENDICES
1. List of acronyms
2. List of participants
(Document pdf contains 431 pages
Proceedings of the XVIIIth Telemac & Mascaret User Club 2011, 19-21 October 2011, EDF R&D, Chatou
Water Qualit
Do bacteria thrive when the ocean acidifies? Results from an off-shore mesocosm study
Marine bacteria are the main consumers of the freshly produced organic matter. In order to meet their carbon demand, bacteria release hydrolytic extracellular enzymes that break down large polymers into small usable subunits. Accordingly, rates of enzymatic hydrolysis have a high potential to affect bacterial organic matter recycling and carbon turnover in the ocean. Many of these enzymatic processes were shown to be pH sensitive in previous studies. Due to the continuous rise in atmospheric CO2 concentration, seawater pH is presently decreasing at a rate unprecedented during the last 300 million years with so-far unknown consequences for microbial physiology, organic matter cycling and marine biogeochemistry.
We studied the effects of elevated seawater pCO2 on a natural plankton community during a large-scale mesocosm study in a Norwegian fjord. Nine 25m-long Kiel Off-Shore Mesocosms for Future Ocean Simulations (KOSMOS) were adjusted to different pCO2 levels ranging from ca. 280 to 3000 µatm by stepwise addition of CO2 saturated seawater. After CO2 addition, samples were taken every second day for 34 days. The first phytoplankton bloom developed around day 5. On day 14, inorganic nutrients were added to the enclosed, nutrient-poor waters to stimulate a second phytoplankton bloom, which occurred around day 20.
Our results indicate that marine bacteria benefit directly and indirectly from decreasing seawater pH. During both phytoplankton blooms, more transparent exopolymer particles were formed in the high pCO2 mesocosms. The total and cell-specific activities of the protein-degrading enzyme leucine aminopeptidase were elevated under low pH conditions. The combination of enhanced enzymatic hydrolysis of organic matter and increased availability of gel particles as substrate supported higher bacterial abundance in the high pCO2 treatments. We conclude that ocean acidification has the potential to stimulate the bacterial community and facilitate the microbial recycling of freshly produced organic matter, thus strengthening the role of the microbial loop in the surface ocean
Küstennähe numerische Modellierung von windgenerierten Wellen in halgeschlossenen Meeresgebieten: Kalibrierung und Anwendung
A central question in this study is the evaluation and the improvement of the accuracy of wind-wave predictions in semi-enclosed seas. It was investigated how the parametrization of the wave models can be modified to provide accurate predictions in these specific areas. Furthermore, this work outlines how the physical inputs of the wave model such as the wind forcing and the bathymetry can affect wave predictions. An additional objective of this work is to assess the accuracy of the in-situ and remote field observations used in the calibration and validation processes of the numerical wave model. To examine these questions, wind-waves were simulated with the spectral wave model Simulating WAves Nearshore (SWAN) included in the Delft3D modelling package (Deltares, the Netherlands). Extensive calibration and validation of the wave model and its wind forcing were achieved by means of large datasets of in-situ and remote measurement technologies. Numerical predictions of wind-generated waves in two semi-enclosed seas, the Red Sea and the Bohai Sea were improved by means of modifications of the source term responsible of the generation of wave energy by wind in the action balance equation of the wave model. The findings provide support to the scientific community in the field of the operational oceanography. The outputs of the wave model for the Red Sea and the coastal waters of Jeddah were integrated into a coastal monitoring system. The wave model set up for the Bohai Sea is part of a Decision Support System for the Shandong peninsula. The two information systems provide hindcasts and forecasts of hydrodynamic parameters.Eine zentrale Frage in dieser Arbeit ist die Beurteilung und die Verbesserung der Genauigkeit von Vorhersagen für Windseen in halb geschlossenen Meeresgebieten. Es wurde untersucht wie die Parametrisierung des Wellenmodels modifiziert werden kann, um genaue Vorhersagen für die untersuchten Gebiete bereitzustellen. Außerdem umreißt diese Arbeit, wie die physikalischen Eingangsgrößen des Wellenmodells, der Windantrieb und die Bathymetrie die Vorhersage von Wellen beeinflussen können. Ein weiteres Ziel dieser Arbeit besteht darin, die Genauigkeit der In-Situ- und Fernerkundungsdaten einzuschätzen, die im Kalibrierungs- und Validierungsprozess des numerischen Modells benutzt wurden. Um diese Fragen zu untersuchen, wurden Windseen mit dem spektralen Wellenmodel Simulating WAves Nearshore (SWAN) simuliert, dass in der Modellierungssoftware Delft3D (Deltares, Holland) enthalten ist. Eine umfassende Kalibrierung und Validierung des Wellenmodells und seines Antriebs durch Wind wurde mit Hilfe großer Datensätze aus In-Situ- und Fernerkundungs-Meßtechniken erreicht. Numerische Vorhersagen von windgenerierten Wellen in zwei halb geschlossenen Meeresgebieten, dem Roten Meer und der Bohai See, wurden mit Hilfe von Modifikationen des Quellterms verbessert, der für die Erzeugung von Wellenenergie durch Wind in der Gleichung der spektrale Wirkungsdichte des Wellenmodels verantwortlich ist. Die Befunde liefern Unterstützung für die Wissenschaftler auf dem Gebiet der operativen Ozeanographie. Die Ergebnisse aus dem Wellenmodell für das Rote Meer und die Küstengewässer von Jeddah wurden in ein Küsten-Monitoring-System integriert. Das Wellenmodell, dass für die Bohai See aufgestellt wurde, ist ein Bestandteil eines Entscheidungshilfesystems (DSS) für die Shandong Halbinsel. Die beiden Informationssysteme stellen Hindcasts und Vorhersagen hydrodynamischer Parameter bereit
Research and Technology
Langley Research Center is engaged in the basic an applied research necessary for the advancement of aeronautics and space flight, generating advanced concepts for the accomplishment of related national goals, and provding research advice, technological support, and assistance to other NASA installations, other government agencies, and industry. Highlights of major accomplishments and applications are presented
YOUMARES 8 – Oceans Across Boundaries: Learning from each other
This open access book presents the proceedings volume of the YOUMARES 8 conference, which took place in Kiel, Germany, in September 2017, supported by the German Association for Marine Sciences (DGM). The YOUMARES conference series is entirely bottom-up organized by and for YOUng MARine RESearchers. Qualified early career scientists moderated the scientific sessions during the conference and provided literature reviews on aspects of their research field. These reviews and the presenters’ conference abstracts are compiled here. Thus, this book discusses highly topical fields of marine research and aims to act as a source of knowledge and inspiration for further reading and research