scholarly journals Variability of Monthly Radiocarbon During the 1760S in Corals from the Galapagos Islands

Radiocarbon ◽  
2004 ◽  
Vol 46 (2) ◽  
pp. 627-631 ◽  
Author(s):  
Ellen R M Druffel ◽  
Sheila Griffin ◽  
Jeomshik Hwang ◽  
Tomoko Komada ◽  
Steven R Beaupre ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Spectral Analysis ◽  
Galapagos Islands ◽  
University Of California ◽  
Data Sets ◽  
Galápagos Islands ◽  
The Pacific ◽  
The Pacific Ocean ◽  
C Value ◽  
The University

Radiocarbon (Δ14C) measurements of monthly samples from a Galapagos surface coral are among the first data sets from the new Keck Carbon Cycle Accelerator Mass Spectrometry laboratory at the University of California, Irvine. An average Δ14C value of −62 is obtained for 144 measurements of samples from monthly coral bands that lived from about AD 1760–1771 (±6 yr). High Δ14C values were found during January through March, when upwelling was weak or absent at the Galapagos Islands. Low Δ14C values were obtained mid-year during strong upwelling. The average seasonal variability of Δ14C was 15–25, which is greater than that at other tropical and subtropical locations in the Pacific Ocean because of intense seasonal upwelling at this site. Periods of sustained high Δ14C values were found during 1762–1763 and 1766. A spectral analysis revealed that the spectral density for the Δ14C data displays most of its variance at the 5-yr cycle, which is reflective of El Niño periodicity during the 20th century.

scholarly journals The occurrence of Callinectes arcuatus ordway, 1863 (Crustacea, Decapoda, Portunidae) in Bahia, Brazil

1987 ◽  
Vol 4 (1) ◽  
pp. 59-62
Author(s):  
Edilson Pires de Gouvêa
Keyword(s):  
Pacific Ocean ◽  
Atlantic Ocean ◽  
Galapagos Islands ◽  
Brazilian Coast ◽  
Galápagos Islands ◽  
The Pacific ◽  
First Occurrence ◽  
The Pacific Ocean

During the study of the Carcinofauna of the Bahian Coast, some Brachyura Portunidae were found. Some of these animals were Callinectes arcuatus Ordway, 1863 which has its distribution restricted to the Pacific Ocean, from California to Peru and the Galapagos Islands. This is the first occurrence of this species reported from the Atlantic Ocean and the Brazilian Coast (Bahia, 38º50'Wand 12º50'S).

scholarly journals Large-Volume WOCE Radiocarbon Sampling in the Pacific Ocean

Radiocarbon ◽  
1996 ◽  
Vol 38 (3) ◽  
pp. 519-561 ◽  
Author(s):  
Minze Stuiver ◽  
H. G. Östlund ◽  
Robert M. Key ◽  
Paula J. Reimer
Keyword(s):  
Pacific Ocean ◽  
Large Volume ◽  
University Of Washington ◽  
Data Set ◽  
Comprehensive Data ◽  
The Pacific ◽  
The Pacific Ocean ◽  
University Of Miami ◽  
The University

At the University of Miami Tritium Laboratory and the University of Washington Quaternary Isotope Laboratory, more than 1000 large-volume Pacific Ocean radiocarbon samples were measured for the WOCE program. Here we present a comprehensive data set, and a brief discussion of our findings.

The Graphical Records of Matthew Flinders's Voyage to Terra Australis

1984 ◽  
Vol 37 (1) ◽  
pp. 94-103 ◽  
Author(s):  
A. N. Ferrar
Keyword(s):  
Indian Ocean ◽  
Memorial Lecture ◽  
South East Asia ◽  
Cape Of Good Hope ◽  
The Pacific ◽  
Marco Polo ◽  
The Indian Ocean ◽  
The Pacific Ocean ◽  
The University ◽  
Sailing Ship

This second Matthew Flinders Memorial Lecture, in a series sponsored jointly by the Royal Institute of Navigation and the Hydrographic Society with the cooperation of Lincolnshire and Humberside Arts was presented at the University of Hull on 11 May 1983 with Sir John Dudding, Chairman of Lincolnshire and Humberside Arts in the Chair. The first lecture, presented by Rear-Admiral G. S. Ritchie in April 1974 (Journal27, 3) on the bicentenary of the birth of Matthew Flinders, described the hydrographic work of this exploring navigator. Miss Ferrar concentrates on the graphical records of Flinders's Australian voyages.When Marco Polo made his journey to China, overland from Venice in the thirteenth century, the lands around the Pacific Ocean were wholly unknown to Europeans. But the silks and spices with which he returned sowed the seeds of the quest for a sea route to the ‘Spice Islands’ which was to be one of the mainsprings of exploration for nearly 500 years. The Spaniards crossed the Atlantic. But instead of finding themselves on the coast of Asia as they had expected they discovered the lands (and the wealth) of the Aztecs and Incas, and their explorations extended along the Pacific coasts of Central and South America from Mexico to Peru. The Portuguese found their way around southern Africa and across the Indian Ocean to South-east Asia, where they attained their objective and established a lucrative trade with the Spice Islands. Sailing ship routes depend upon the direction of prevailing winds, so the outward voyage took them eastwards from the Cape of Good Hope and then northwards to their destination. The homeward crossing of the Indian Ocean was in more northerly latitudes.

Multiclass Contour-Preserving Classification with Support Vector Machine (SVM)

2017 ◽  
Vol 26 (2) ◽  
pp. 323-334 ◽  
Author(s):  
Piyabute Fuangkhon
Keyword(s):  
Support Vector Machine ◽  
Classification Accuracy ◽  
University Of California ◽  
Support Vector ◽  
Data Sets ◽  
Feed Forward Neural Network ◽  
Real World Data ◽  
Data Set ◽  
The University ◽  
Training Sets

AbstractMulticlass contour-preserving classification (MCOV) has been used to preserve the contour of the data set and improve the classification accuracy of a feed-forward neural network. It synthesizes two types of new instances, called fundamental multiclass outpost vector (FMCOV) and additional multiclass outpost vector (AMCOV), in the middle of the decision boundary between consecutive classes of data. This paper presents a comparison on the generalization of an inclusion of FMCOVs, AMCOVs, and both MCOVs on the final training sets with support vector machine (SVM). The experiments were carried out using MATLAB R2015a and LIBSVM v3.20 on seven types of the final training sets generated from each of the synthetic and real-world data sets from the University of California Irvine machine learning repository and the ELENA project. The experimental results confirm that an inclusion of FMCOVs on the final training sets having raw data can improve the SVM classification accuracy significantly.

scholarly journals Envisioning an Interconnected Ocean: Understanding the Links Between Geological Ocean Structure and Coastal Communities in the Pacific

2021 ◽  
Vol 55 (3) ◽  
pp. 68-69
Author(s):  
Megan Lubetkin ◽  
Nicole Raineault ◽  
Sarah Gaines
Keyword(s):  
Pacific Islands ◽  
Structural Features ◽  
Local Communities ◽  
Seafloor Mapping ◽  
Marine Management ◽  
Ocean Science ◽  
Ocean Exploration ◽  
The Pacific ◽  
The Pacific Ocean ◽  
The University

Abstract Covering nearly one third of the Earth's surface, the Pacific Ocean contains many significant interconnected geologic features extending into the coastal zone and the islands themselves. Trenches, ridges, seamount chains, faults, and fracture zones are not only fundamental expressions of Earth processes but also fundamental to life. Without awareness of these features and their natural and cultural importance, marine management and global understanding will remain disjointed. The Ocean Exploration Trust (OET) will spend the next several years in the Pacific conducting scientific expeditions to better understand the ocean through seafloor mapping and ocean exploration. Western ocean science is one of many ways to perceive and value the structural features of the Pacific. Communities across Pacific islands—often volcanic peaks emerging from deep below—are interconnected by water and by the underlying seafloor. We acknowledge the knowledge from local communities and recognize the multitude of ways to conceptualize and relate to the Pacific. With the University of Rhode Island's Coastal Resources Center (CRC), OET seeks to collaborate with local communities to reveal the structural significance and interconnected nature of oceanic features, making a link to the livelihoods of Pacific islanders. Further objectives would be co-designed with partners from local communities.

scholarly journals Die Polychaeten der Amsterdam-Expedition nach der Insel Ascension (Zentral-Atlantik)

1992 ◽  
Vol 61 (4) ◽  
pp. 219-235 ◽  
Author(s):  
Gesa Hartmann-Schröder
Keyword(s):  
Atlantic Ocean ◽  
Persian Gulf ◽  
West Indies ◽  
Galapagos Islands ◽  
Species Level ◽  
South Shetland Islands ◽  
Galápagos Islands ◽  
Shetland Islands ◽  
Ascension Island ◽  
The Pacific

During the Amsterdam Expedition to Ascension Island in 1989 eighteen species of polychaetes were collected, fifteen of which were already known to science. One could not be identified to species level and two were new to science: Aricidea (Aedicira) ascensionensis n. sp. and Notodasus arenicola n. sp. Four of the known species are widely distributed, three are circumtropicalsubtropical and one has a tropical-subtropical distribution in the Pacific and in the Atlantic Ocean. Another species is recorded from different regions in the Atlantic Ocean. The rest of the species were –.until now –.only known from their type localities, viz. West Indies, Angola, Persian Gulf, Galapagos Islands, and South Shetland Islands.

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