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Showing 1-25 of 1,516 resultsfor "Index Terms":North Atlantic
"Index Terms":North Atlantic
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An admittance study of the Reykjanes Ridge and elevated plateaux between the Charlie-Gibbs and Senja fracture zones
The North Atlantic between the Charlie-Gibbs and Senja Fracture Zones shows a number of oceanic plateaux, continental fragments and unusual mid-oceanic ridges, the Reykjanes Ridges and the Iceland Plateau being the most prominent ones. While rifted continental fragments and marginal volcanic plateaux have been formed during the initial formation process of the North Atlantic, others, such as the R...Show More
On the roughness of Mesozoic oceanic crust in the western North Atlantic
Seismic reflection profiles from Mesozoic oceanic crust around the Blake Spur Fracture Zone (BSFZ) in the western North Atlantic have been widely used in constraining tectonic models of slow-spreading mid-ocean ridges. These profiles have anomalously low basement relief compared to crust formed more recently at the Mid-Atlantic Ridge at the same spreading rate. Profiles from other regions of Mesoz...Show More
Modeling of the North Atlantic Gyre's Meridional Overturning Circulation with Neural Nets
Owen Jiang;David Nizovsky;Tingying Helen Zeng;Mikhail Y. Shalaginov
2024 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea)
Year: 2024 | Conference Paper |
The effects of changing climate patterns have been readily seen in weather observations. Their effects on land are much more understood than their effects on the ocean, largely due to disparities in the number of observations and studies. Relatively little research has been done to analyze the effects of climate change on oceanic cycles by directly utilizing artificial intelligence, particularly r...Show More
Existing models of relative motion between the South America and Africa plates significantly misrepresent the azimuth of Lower Cretaceous seafloor spreading in the South Atlantic Ocean. An improved model is derived from fits of fracture zones, magnetic reversal anomalies, and the edges of a rifted large igneous province at the Northeast Georgia Rise and Agulhas Plateau. An absolute date for this r...Show More
We reassess the applicability of the thermal plate cooling model to the subsidence of the North Pacific, Atlantic and North Indian Ocean Basins. We use a new numerical plate model in which the thermophysical parameters of the lithosphere vary with temperature according to the results of laboratory experiments, and the ridge temperature structure is consistent with the thickness of the oceanic crus...Show More
Upper Miocene magnetic stratigraphy at ODP site 1092 (sub-Antarctic South Atlantic): recognition of ‘cryptochrons’ in C5n.2n
U-channel samples from ODP site 1092 in the sub-Antarctic South Atlantic Ocean provide an interpretable magnetic stratigraphy from 1.95 to ∼3.6 Ma and from ∼5.9 to 13.5 Ma. Although the interpretation is unclear within the Gilbert Chron (C3), the record represents one of the more complete Upper Miocene polarity stratigraphies from the South Atlantic. Eight polarity subchrons that are not included ...Show More
Combined P- and S-wave velocity profiles have been widely used to assess the composition of the oceanic crust, but no quantitative estimates of the abundances of mafic and ultramafic rocks which are compatible with the seismic structure of the crust have been made. In this study, a Voigt–Reuss–Hill (VRH) average model based on the average elastic properties of partially serpentinized peridotites a...Show More
Cerulean Information Factory: A New European Space Agency-Funded Project to Develop Decision-Support Tools for the North Atlantic and Arctic Oceans
OCEANS 2024 - Halifax
Year: 2024 | Conference Paper |
The The European Space Agency (ESA), responding to the European Green Deal-Europe's commitment to climate neutrality by 2050-has launched the Green Transition Information Factory (GTIF) program. Its goal is to use satellite and other data to create tools for decision-makers to support the transition to a greener economy. “The ESA Green Transition Information Factory (GTIF) allows users to interact...Show More
Aligning the seasonal migration of North Atlantic Right Whales with oceanic features
Courtney Dreyfust;Josh Kohut;Laura Nazzaro;Joseph Brodie;Matthew Oliver;Mark Baumgartner
While baleen whales have been migrating through the oceans for millions of years, more recent human activity has heavily impacted their populations. The population of North Atlantic right whales (NARW) has been in rapid decline compared to other baleen whale species. To counteract this, there has been a recent push in science and conservation to understand how the ocean environment influences the ...Show More
Impacts of North Atlantic Long-Term Sea Level Variability on U.S. East Coast
Yongcun Cheng;Qing Xu;Bin Zou;Ting Liu;Lijian Shi;Xiaobin Yin
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium
Year: 2019 | Conference Paper |
In this work, the cyclostationary empirical orthogonal function analysis and the empirical mode decomposition (EMD) method is used to compute the low frequency parts (T > ~ 5 years) in tide gauge, satellite altimetry and reconstructed sea level data. High spatio-temporal correlations are observed between tide gauge measurements North of Cape Hatteras (NCH) and other datasets in the subpolar and tr...Show More
Ambient seismic noise imaging of the lowermost mantle beneath the North Atlantic Ocean
Body waves can be extracted from correlation functions computed from seismic records even at teleseismic distances. Here we use P and PcP waves from the secondary microseism frequency band that are propagating between Europe and the Eastern United States to image the core–mantle boundary (CMB) and D” structure beneath the North Atlantic. This study presents the first 3-D image of the lower mantle ...Show More
A dynamic model for the Iceland Plume and the North Atlantic based on tomography and gravity data
The North Atlantic around Iceland is characterized by a large geoid high and an anomalous shallow ocean floor; both observations are presumably due to upwelling of hot material in the mantle. We extracted this region from a global tomography data set to study the structure of the mantle in more detail. The tomography data reveal a confined low-velocity structure from the core—mantle boundary (CMB)...Show More
Comparison of HOAPS, QuikSCAT, and Buoy Wind Speed in the Eastern North Atlantic and the North Sea
JÖrg Winterfeldt;Axel Andersson;Christian Klepp;Stephan Bakan;Ralf Weisse
A systematic investigation and comparison of near-surface marine wind speed obtained from in situ and satellite observations, a reanalysis, and a reanalysis-driven regional climate model (RCM) are presented for the eastern North Atlantic and the North Sea. Wind-speed retrievals from QuikSCAT Level 2B 12.5 km and HOAPS-3-S are analyzed. The root-mean-square error (rmse) between QuikSCAT and buoy 10...Show More
Shifting Trends in Bimodal Phytoplankton Blooms in the North Pacific and North Atlantic Oceans From Space With the Holo-Hilbert Spectral Analysis
Merged satellite ocean color data were used to examine trends in the timing and magnitude of phytoplankton blooms. Special emphasis was placed on the peak shift of spring and autumn/winter blooms in the North Pacific and North Atlantic Oceans with bimodal seasonal cycles. Ensemble empirical mode decomposition and Holo-Hilbert spectral analysis were combined to extract seasonal signals and investig...Show More
Breakup of Pangaea and plate kinematics of the central Atlantic and Atlas regions
A new central Pangaea fit (type A) is proposed for the late Ladinian (230 Ma), together with a plate motions model for the subsequent phases of rifting, continental breakup and initial spreading in the central Atlantic. This model is based on: (1) a reinterpretation of the process of formation of the East Coast Magnetic Anomaly along the eastern margin of North America and the corresponding magnet...Show More
Anomalous seaward dip of the lithosphere–asthenosphere boundary beneath northeastern USA detected using differential-array measurements of Rayleigh waves
Rayleigh wave phase velocities and azimuth anomalies in the period range of 30–100 s are measured for a set of four triangular arrays of broad-band seismometers in coastal northeastern USA. This is a region in which a strong upper mantle slow shear velocity anomaly (a ‘New England Anomaly’), crosses the continental margin. Earthquakes from a wide range of directions are used to detect the variatio...Show More
Comment on ‘Breakup of Pangaea and plate kinematics of the central Atlantic and Atlas regions’ by Antonio Schettino and Eugenio Turco
Schettino and Turco recently proposed a revised model for the continental closure of Pangaea and the early opening history of the Central Atlantic Ocean based on a quantitative method, in combination with a range of geological and geophysical data. Their discussion and final results do not properly consider field data, and moreover, their analyses violate certain plate kinematic principles. The co...Show More
Influence of the Iceland mantle plume on oceanic crust generation in the North Atlantic
When a mantle plume with elevated temperature underlies an oceanic spreading centre it affects the generation of oceanic crust by creating thicker crust. We map the variation in crustal thickness and seismic velocity along three long-offset seismic profiles acquired over oceanic crust generated shortly after continental breakup in the North Atlantic: a 212-km-long flowline from the Faroes rifted c...Show More
High precision atmospheric oxygen (O2) measurements are a relatively new and powerful tool for studying the global carbon cycle. Despite the development of several techniques for achieving these measurements over the past two decades, the quantification of small changes (ppm-level) in the background concentration of O2 (21%) still remains very challenging. We have built a measuring system capable ...Show More
A New Approach for North Atlantic Right Whale Upcall Detection
2016 International Symposium on Computer, Consumer and Control (IS3C)
Year: 2016 | Conference Paper |
Cited by: Papers (7)
In this paper, a new up-call detection algorithm for North Atlantic Right Whales is proposed. Mel Frequency Cepstral Coefficients and Discrete Wavelet Transform (DWTs) are used to extract features of North Atlantic Right Whale up-calls. Several types of wavelets are tested in terms of detection accuracy. Once the up-call features are extracted, classifiers such as Support Vector Machines and KNNs ...Show More
Comparison of two methods for detection of North Atlantic Right Whale upcalls
2015 23rd European Signal Processing Conference (EUSIPCO)
Year: 2015 | Conference Paper |
Cited by: Papers (5)
In this paper, a study is carried out for detecting North Atlantic Right Whale upcalls with measurements from passive acoustic monitoring devices. Preprocessed spectrograms of upcalls are subjected to two different tasks, one of which is based on extraction of time-frequency features from upcall contours, and the other that employs a Local Binary Pattern operator to extract salient texture feature...Show More
Detection of North Atlantic Right Whales with a Hybrid System of CNN and Dictionary Learning
2018 International Conference on Computational Science and Computational Intelligence (CSCI)
Year: 2018 | Conference Paper |
Cited by: Papers (4)
In this paper, a hybrid approach of using Convolutional Neural Network (CNN) and dictionary learning is proposed for the detection of North Atlantic Right Whale (NARW) up-calls. The CNN was applied to extract features from NARW up-calls after these sound signals are converted into spectrograms. The features were then used to train a dictionary with a dictionary learning algorithm. The hybrid syste...Show More
Impact of Sampling Strategies on the Monitoring of Climate Regime Shifts with a Learning Data Assimilation Method
Perrine Bauchot;Angélique Drémeau;Florian Sévellec;Ronan Fablet
ICASSP 2024 - 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
Year: 2024 | Conference Paper |
In oceanography, the acquisition and processing of observations are crucial to improve the understanding of complex oceanic processes. Considering an idealized model of the North Atlantic ocean circulation, we propose to implement a variational data assimilation method optimized by deep learning to reconstruct abrupt changes in ocean circulation, representing Dansgaard-Oeschger climate events. We ...Show More
Impact of Sampling Strategies on the Monitoring of Climate Regime Shifts with a Learning Data Assimilation Method
Perrine Bauchot;Angélique Drémeau;Florian Sévellec;Ronan Fablet
ICASSP 2024 - 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
Year: 2024 | Conference Paper |
Beginning in 1935 a joint study of radio transmission has been in progress. This involved radio measurements in Argentina and the United States, co-ordinated with similar measurements in Europe. A remarkable anomaly in long-distance broadcast transmission had been indicated by certain observations in 1932, viz, much lower received wave intensities for transmission across the North Atlantic Ocean b...Show More
High-resolution estimates of Nubia–North America plate motion: 20 Ma to present
We present new, detailed estimates of Nubia–North America plate motion since 20 Ma based on 21 rotations that reconstruct seafloor spreading magnetic lineations and fracture zone flow lines between the two plates and an instantaneous angular velocity that best fits the velocities of 1343GPS stations on the two plates. Total opening distances and opening gradients along the plate boundary are cons...Show More
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