scholarly journals PREDICTIVE MODEL FOR DAILY CHANGES OF SHORELINE

1988 ◽  
Vol 1 (21) ◽  
pp. 93
Author(s):  
Kazumasa Kotah ◽  
Shin-ichi Yanagishima
Keyword(s):  
Predictive Model ◽  
Sandy Beach ◽  
Research Facility ◽  
Short Term ◽  
The Pacific ◽  
Line Theory ◽  
The Pacific Ocean ◽  
The One ◽  
Incident Waves ◽  
Daily Changes

Beach profiles have been being measured every day on sandy beach at the Hazaki Oceanographical Research Facility, facing to the Pacific Ocean. Based on the data obtained during the period from March 12, 1986 to September 11, the relation between the daily changes of shoreline position and energy flux of incident waves is analyzed. A tentative predictive model of the short-term shoreline changes is proposed. A combination of this model and the one-line theory is examined.

scholarly journals Analysis of Short-Term Steel Corrosion Products Formed in Tropical Marine Environments of Panama

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Juan A. Jaén ◽  
Josefina Iglesias ◽  
Cecilio Hernández
Keyword(s):  
Corrosion Behaviour ◽  
Low Carbon Steel ◽  
Steel Corrosion ◽  
Corrosion Products ◽  
Urban Site ◽  
Low Carbon ◽  
Short Term ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Time Of Wetness

A low-carbon steel A-36 and two conventional weathering steels A-588 and COR-420 exposed at four atmospheric test stations located in (i) Tocumen, an urban site near the Pacific Ocean, (ii) Sherman-Open, (iii) Sherman-Coastal, and (iv) Sherman-Breakwater on the Caribbean coast of Panama. Kinetics of the short-term atmospheric corrosion process and the relationship with exposure time and environmental characteristics of each site were investigated. The atmospheric exposure conditions, particularly the time of wetness, deposition of chloride, and the washing effect of contaminants on the metal surface by rain are of upmost importance in determining the corrosion behaviour and composition of rust. The corrosion products were mainly identified using room temperature and low temperature (80 K) Mössbauer spectroscopy, FTIR, and X-ray powder diffraction. In all samples,γ-FeOOH andα-FeOOH were the main constituents. Maghemite (γ-Fe2O3), magnetite (Fe3O4), and Akaganeite (β-FeOOH) were also identified.

INVESTIGATION OF MICROSEISM SOURCES WITH OCEAN‐BOTTOM SEISMOMETERS

Geophysics ◽  
1965 ◽  
Vol 30 (4) ◽  
pp. 511-526 ◽  
Author(s):  
H. Bradner ◽  
J. G. Doods ◽  
R. E. Foulks
Keyword(s):  
Noise Spectrum ◽  
Ocean Bottom ◽  
Percent Confidence Level ◽  
The Pacific ◽  
Peak Energy ◽  
Higher Power ◽  
Ocean Bottom Seismometers ◽  
Subsequent Conversion ◽  
The Pacific Ocean ◽  
Incident Waves

Recordings to depths of 5 km have been made on the Pacific Ocean bottom with self‐rising internally recording seismometers. Simultaneous recordings have been made at land stations. The ocean‐bottom noise spectrum is between one and five orders of magnitude higher power than the land spectrum in the region from 0.1 to 9.0 cps. Coherence between two simultaneous instruments separated one‐quarter kilometer is above the 95 percent confidence level from 0.1 cps to 0.6 cps. Attempts to associate narrow‐beam Love and Rayleigh peaks with large storm‐generating areas or with heavy swell striking shore have not produced consistent results. Although some records show the bulk of the microseism peak energy in well‐defined modes, the energy is carried in different modes at different times and locations. Some of our data fit a model of microseism generation in a 100‐mile strip, by a statistical superposition of incident waves and waves reflected from shore; and the subsequent conversion of the energy to Rayleigh and Love modes propagating away from the generation zone. However, the shapes of the mid‐ocean spectra strongly imply additional sources far from shorelines or recognized storms, unless microseisms attenuate far less in the ocean than on land.

scholarly journals Potential for climate variability reconstruction from Andean glaciochemical records

2002 ◽  
Vol 35 ◽  
pp. 443-450 ◽  
Author(s):  
Patrick Ginot ◽  
Margit Schwikowski ◽  
Ulrich Schotterer ◽  
Willibald Stichler ◽  
Heinz W. Gäggeler ◽  
...  
Keyword(s):  
Climate Variability ◽  
Amazon Basin ◽  
Chemical Constituents ◽  
Atmospheric Conditions ◽  
Short Term ◽  
Moisture Source ◽  
Chemical Tracers ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Isotope Content

AbstractIn order to select glacier sites suitable for the reconstruction of short-term climate variability, chemical constituents of shallow cores from Chimborazo, Ecuador, Illimani, Bolivia, and Cerro Tapado, Chile, were analyzed to determine if they represent the climate and atmospheric conditions of the particular area. Pronounced variations were observed in the Chimborazo core, which were attributed to the seasonal occurrence of wet and dry periods. Using chemical tracers, the Pacific and the Amazon basin were identified as the two principal sources of atmospheric moisture. In the Illimani record, seasonality is obvious but is less regular than in the Chimborazo core. Chemical tracers point to the Amazon basin as a moisture source. Post-depositional sublimation masks a possible atmospheric signal in the glaciochemical records from Cerro Tapado. the arid conditions and a prevailing high condensation level also cause little variability in the stable-isotope content. Irregular, more negative δ18O values occur during the humid phases of El Niño events. Despite alterations due to sublimation, chemical tracers indicate the Pacific Ocean as a main moisture source for precipitation preserved on Glaciar CerroTapado.

scholarly journals D.I. Mendeleev about the cultural and historical tasks of Russia in the East

2018 ◽  
Vol 7 (2) ◽  
pp. 208-211
Author(s):  
Valery Vladimirovich Suvorov
Keyword(s):  
Policy Development ◽  
Fairy Tale ◽  
Far East ◽  
The Other ◽  
The West ◽  
The Far East ◽  
The Pacific ◽  
The Pacific Ocean ◽  
The One ◽  
Historical Necessity

At the turn of the XIX-XX centuries, the movement of Russia to the East became one of the topics discussed in domestic journalism and scientific thought. His views on this issue were also expressed by the outstanding scientist D.I. Mendeleev. In his works he stressed the historical necessity and inevitability of Russias access to the Pacific Ocean, the importance of its foreign policy development in the Far East direction. Showing the cultural and civilizational distancing of Russia from the West, he focused on the presence of eastern features in it, but at the same time he noted its cultural and historical uniqueness. In Mendeleevs discourses, a departure from Eurocentrism in the assessments of the East and Russia can be traced. Speaking about the cultural and historical tasks of Russia, the scientist stressed that it was more important to maintain the charm of the name in the East than to imitate Western states, especially England. In Mendeleevs papers, special emphasis was made on the peaceful strengthening of Russia in Asia and a friendly attitude towards the Eastern peoples. An interesting feature of Mendeleevs reasoning is the motif of a fairy tale: on the one hand, it is a half-sketchy east, on the other, a fairy tale as the image of an ideal future for Russia.

scholarly journals First discovery – and a new species – of Coelogynopora (Platyhelminthes, Proseriata) in the Southern Hemisphere

2021 ◽  
Vol 775 ◽  
pp. 185-196
Author(s):  
Odile Volonterio ◽  
Rodrigo Ponce de León
Keyword(s):  
New Species ◽  
Species Diversity ◽  
Southern Hemisphere ◽  
Morphological Characters ◽  
Recent Analysis ◽  
Magellan Strait ◽  
The Pacific ◽  
The Pacific Ocean ◽  
The One ◽  
A New Species

Coelogynoporidae (Platyhelminthes) includes comparatively large and slender Proseriata, usually occurring in shallow benthic environments. Coelogynopora Steinböck, 1924 is the most frequently reported genus and the one with the highest species diversity. Notwithstanding that, the genus has never been reported from the Southern Hemisphere. A recent analysis of sediment from the Magellan Strait shores (Chile) resulted in the discovery of a new species of Coelogynopora, the first representative of the genus to be found in austral waters. The new species is defined by the following combination of characters: sclerotised copulatory system consisting of a slender, ventrally curved stylet with a broad base and three pairs of symmetrically arranged spines, the proximal ends of which are fused laterally to the base of the stylet; distal ends of the three pairs of spines hooked, with apophyses at progressively longer distances from the tip; accessory spines and solar organ absent. Based on the morphological characters, the new species appears to be more related to species from the Pacific Ocean than to those from the Atlantic Ocean. The present work suggests a vast biogeographic disjunction in the genus Coelogynopora, which may be described as a bipolar or amphitropical pattern of distribution.

Estimation of 137Cs inventories by a global ocean general circulation model for the global database interpolation

2021 ◽  
Author(s):  
Daisuke Tsumune ◽  
Frank Bryan ◽  
Keith Lindsay ◽  
kazuhiro Misumi ◽  
Takaki Tsubono ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Atlantic Ocean ◽  
General Circulation ◽  
Circulation Model ◽  
Global Fallout ◽  
Global Ocean ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Ocean General Circulation ◽  
The One

<p>Artificial radionuclide <sup>137</sup>Cs has been supplied into the ocean by global fallout due to atmospheric nuclear weapons tests since 1945, releases from reprocessing plants since 1952, and most recently by fallout and discharge due to the Fukushima Dai-ichi Nuclear Power Plant (1F NPP) accident since 2011.<sup>137</sup>Cs activities measured for scientific purposes as well as environmental health and safety monitoring have been summarized in a historical database by IAEA. The spatio-temporal density of the observations varies widely, therefore simulation by an ocean general circulation model (OGCM) can be helpful in the interpretation of these observations. We used the Parallel Ocean Program version 2 (POP2) of the Community Earth System Model version 2 (CESM2). The horizontal resolution is 1.125 degrees in longitude and 0.28 to 0.54 degrees in latitude. The simulation period was from 1945 to 2030, and the atmospheric conditions were forced to cycle through repeating normal years. The purposes of this study are to investigate the effect of the release from the reprocessing plants on the distribution of <sup>137</sup>Cs activity by global fallout in the Atlantic Ocean, and the effect of the release derived from the 1F NPP accident on the one by global fallout in the Pacific Ocean.</p><p>The simulated <sup>137</sup>Cs activities were in good agreement with the observed data in the database in the Atlantic Ocean and the Pacific Ocean. The simulated <sup>137</sup>Cs activity immediately after each release event in the North Pacific were inconsistent with the observed one because of the inadequate reproduction of the Kuroshio Current in this quasi-resolution ocean model. However, the influence of the dilution effect is expected to become smaller as the time after the release increases. The influence of the <sup>137</sup>Cs activity by release from the reprocessing plant on the one by global fallout in the Atlantic Ocean is limited to the northeast coast of the European continent and the Marginal Seas. It was also suggested that <sup>137</sup>Cs activity by global fallout has made detection difficult since the 1990s.The influence of the <sup>137</sup>Cs activity by the 1F NPP on the one by global fallout was found to be broadened by the Kuroshio extension area and extended to the California coast. This distribution was similar to that of the one by global fallout. However, there are few observed data off the California coast after 2011. It was also suggested that <sup>137</sup>Cs activity by global fallout has made detection difficult since the 2020 in the Pacific Ocean.</p><p>Even after 2020, it is still possible to detect <sup>137</sup>Cs activity by global fallout in the global ocean. The difference in the vertical distribution between the Pacific and Atlantic oceans reflects the ocean circulation, which is useful for the validation of ocean general circulation models. There is still room for improvement in setting the input conditions to the ocean for each event.</p>

Short-Term Climatic Variability in the Thermal Structure of the Pacific Ocean during 1979–82

1985 ◽  
Vol 15 (7) ◽  
pp. 917-935 ◽  
Author(s):  
Warren B. White ◽  
Gary A. Meyers ◽  
Jean Rene Donguy ◽  
Stephen E. Pazan
Keyword(s):  
Pacific Ocean ◽  
Thermal Structure ◽  
Climatic Variability ◽  
Short Term ◽  
The Pacific ◽  
The Pacific Ocean

Catheter-directed foam sclerotherapy treatment of saphenous vein incompetence

VASA ◽  
2012 ◽  
Vol 41 (2) ◽  
pp. 120-124 ◽  
Author(s):  
Asciutto ◽  
Lindblad
Keyword(s):  
Saphenous Vein ◽  
Short Term ◽  
Foam Sclerotherapy ◽  
Results Of Treatment ◽  
Ulcer Healing Rate ◽  
Complete Obliteration ◽  
Ceap Classification ◽  
One Year ◽  
The One

Background: The aim of this study is to report the short-term results of catheter-directed foam sclerotherapy (CDFS) in the treatment of axial saphenous vein incompetence. Patients and methods: Data of all patients undergoing CDFS for symptomatic primary incompetence of the great or small saphenous vein were prospectively collected. Treatment results in terms of occlusion rate and patients’ grade of satisfaction were analysed. All successfully treated patients underwent clinical and duplex follow-up examinations one year postoperatively. Results: Between September 2006 and September 2010, 357 limbs (337 patients) were treated with CDFS at our institution. Based on the CEAP classification, 64 were allocated to clinical class C3 , 128 to class C4, 102 to class C5 and 63 to class C6. Of the 188 patients who completed the one year follow up examination, 67 % had a complete and 14 % a near complete obliteration of the treated vessel. An ulcer-healing rate of 54 % was detected. 92 % of the patients were satisfied with the results of treatment. We registered six cases of thrombophlebitis and two cases of venous thromboembolism, all requiring treatment. Conclusions: The short-term results of CDFS in patients with axial vein incompetence are acceptable in terms of occlusion and complications rates.

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