Filters








165 Hits in 1.4 sec

Preface [chapter]

Eric P. Chassignet, Ananda Pascual, Joaquin Tintore, Jacques Verron
2018 New Frontiers in Operational Oceanography  
Terms and Conditions: Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or in part, without prior written permission from GODAE OceanView. v P REFACE he implementation of operational oceanography in the past 15 years has provided
more » ... societal benefits and has led to many countries adopting a formal roadmap for providing ocean forecasts. Continuing the tradition of two very successful international summer schools held in France in 2004 (Chassignet and Verron, 2006) and in Australia in 2010 (Schiller and Brassington, 2011), a third international school that focused on frontier research in operational oceanography was held in Majorca in 2017. In the coming years, graduate students and young scientists will be challenged by many new observations (SWOT, Sentinel, AUVs, floats, etc.), complex high-resolution numerical models and data assimilation (high resolution, predictability, uncertainty, changing computing platforms, etc.), and the need to work on many scales (open oceanshelf interactions, coupled ocean-ice-atmosphere, biogeochemistry, etc.). The latter school brought together senior experts and young researchers (pre-and post-doctorate) from across the world and exposed them to the latest research in oceanography, specifically how it will impact operational oceanography. This book is a compilation of the lectures presented at the school and presents a summary of the current state-of-the-art in operational oceanography research.
doi:10.17125/gov2018.ch00 fatcat:mnsvszpg5zgfzhjxfotoaybrfe

Learning Runge-Kutta Integration Schemes for ODE Simulation and Identification [article]

Said Ouala, Laurent Debreu, Ananda Pascual, Bertrand Chapron, Fabrice Collard, Lucile Gaultier, Ronan Fablet
2021 arXiv   pre-print
Deriving analytical solutions of ordinary differential equations is usually restricted to a small subset of problems and numerical techniques are considered. Inevitably, a numerical simulation of a differential equation will then always be distinct from a true analytical solution. An efficient integration scheme shall further not only provide a trajectory throughout a given state, but also be derived to ensure the generated simulation to be close to the analytical one. Consequently, several
more » ... gration schemes were developed for different classes of differential equations. Unfortunately, when considering the integration of complex non-linear systems, as well as the identification of non-linear equations from data, this choice of the integration scheme is often far from being trivial. In this paper, we propose a novel framework to learn integration schemes that minimize an integration-related cost function. We demonstrate the relevance of the proposed learning-based approach for non-linear equations and include a quantitative analysis w.r.t. classical state-of-the-art integration techniques, especially where the latter may not apply.
arXiv:2105.04999v1 fatcat:mf3jjliwxbe7ni5xj27snlbrxy

Multiscale variability in the Balearic Sea: An altimetric perspective

Evan Mason, Ananda Pascual
2013 Journal of Geophysical Research - Oceans  
Merged data from satellite altimetry play an invaluable role Pascual et al., 2002 Pascual et al., , 2007 Amitai et al., 2010; Renault et al., 2012] .  ...  MASON AND PASCUAL: BALEARIC SEA VARIABILITY appears to coincide with April peak river discharges at Cap de 5.3.  ... 
doi:10.1002/jgrc.20234 fatcat:u6przgufoff7nfqkappmusbjaa

Errors in dynamical fields inferred from oceanographic cruise data

Damià Gomis, Ananda Pascual, Mike A. Pedder
2005 Journal of Marine Systems  
Ananda Pascual acknowledges a Marie Curie Host Industry Fellowship funded by the European Commission (Fellowship Contract: HPMI-CT-2001-00100). We are very grateful to Prof. Robert L.  ...  A second method has been suggested by Pascual et al. (2004) , who also proposed to relocate the stations in order to mitigate the impact of the lack of synopticity.  ... 
doi:10.1016/j.jmarsys.2005.02.003 fatcat:vcpkjcv3pvg53a7mqtbc5lm6mq

A case of an intense anticyclonic eddy in the Balearic Sea (western Mediterranean)

Ananda Pascual
2002 Journal of Geophysical Research  
Ananda Pascual holds a doctoral fellowship from the Universitat de les Illes Balears.  ...  PASCUAL ET AL.: INTENSE EDDY IN THE BALEARIC SEA Figure 9 . 9 Station distribution of the Hivern-99 cruise, with selected transects T1 and T2 (dashed lines).  ...  PASCUAL ET AL.: INTENSE EDDY IN THE BALEARIC SEA Figure 4 . 4 Sequence of AVHRR images of the western Mediterranean. Longitude labels correspond to the ticks on the left.  ... 
doi:10.1029/2001jc000913 fatcat:x7onf3n275dwxa56ozdnqamzzm

The 48th Liege colloquium: submesoscale processes: mechanisms, implications, and new frontiers

Alexander Barth, Amala Mahadevan, Ananda Pascual, Simon Ruiz, Charles Troupin
2018 Ocean Dynamics  
doi:10.1007/s10236-018-1173-5 fatcat:fzblyqkpujg57jtse34h64qxwy

Vertical motion in the upper ocean from glider and altimetry data

Simón Ruiz, Ananda Pascual, Bartolomé Garau, Isabelle Pujol, Joaquín Tintoré
2009 Geophysical Research Letters  
Pascual, B. Garau, I. Pujol, and J. Tintoré (2009), Vertical motion in the upper ocean from glider and altimetry data, Geophys. Res. Lett., 36, L14607, doi:10.1029/2009GL038569.  ...  By increasing the number of altimeters merged in the analysis [see for instance Pascual et al., 2006] , the mesoscale activity is better described, smaller features can be resolved and more accurate values  ... 
doi:10.1029/2009gl038569 fatcat:dkkw6si77needf53rf77hmtcya

Improved description of the ocean mesoscale variability by combining four satellite altimeters

Ananda Pascual, Yannice Faugère, Gilles Larnicol, Pierre-Yves Le Traon
2006 Geophysical Research Letters  
The AVISO maps on that date (Pascual et al., 2006) are frequently cited as an example of improved mapping afforded by 4-versus 2satellite sampling.  ...  Pascual, A., Y. Faugère, G. Larnicol, P.-Y. Le Traon (2006), Improved description of the ocean mesoscale variability by combining four satellite altimeters, Geophys. Res.  ... 
doi:10.1029/2005gl024633 fatcat:xzi5j45pp5dgzduofgxcgql3m4

On the mesoscale monitoring capability of Argo floats in the Mediterranean Sea

Antonio Sánchez-Román, Simón Ruiz, Ananda Pascual, Baptiste Mourre, Stéphanie Guinehut
2016 Ocean Science Discussions  
This approach is similar to the one followed by Pascual et al. (2009) .  ... 
doi:10.5194/os-2016-77 fatcat:65w674yth5hfpf54ntmeonfer4

On the mesoscale monitoring capability of Argo floats in the Mediterranean Sea

Antonio Sánchez-Román, Simón Ruiz, Ananda Pascual, Baptiste Mourre, Stéphanie Guinehut
2017 Ocean Science (OS)  
This approach is similar to the one followed by Pascual et al. (2009) .  ... 
doi:10.5194/os-13-223-2017 fatcat:qke3h6lluzdqxn7fmrarq7z4zy

Impact of vertical and horizontal advection on nutrient distribution in the southeast Pacific

Bàrbara Barceló-Llull, Evan Mason, Arthur Capet, Ananda Pascual
2016 Ocean Science (OS)  
., 2012; Pascual et al., 2015) .  ...  The EKE in the South Pacific Gyre has lower values in comparison with more active regions such as the Gulf Stream or Agulhas Current (Pascual et al., 2006; Imawaki et al., 2013) .  ... 
doi:10.5194/os-12-1003-2016 fatcat:2xw23kogmngxxn5if5kqokgncm

Subregional characterization of mesoscale eddies across the Brazil-Malvinas Confluence

Evan Mason, Ananda Pascual, Peter Gaube, Simón Ruiz, Josep L. Pelegrí, Antoine Delepoulle
2017 Journal of Geophysical Research - Oceans  
U, V, and N are diagnosed from the weekly ARMOR3D data (section 2.2) [e.g., Pascual et al., 2015; Barcel o-Llull et al., 2016] .  ...  ., 2003; Pascual et al., 2006] . The DT14 reprocessing eliminates the unknown geoid by removal of the 20 year mean SSH (1993 ( ) [Pujol et al., 2016 .  ... 
doi:10.1002/2016jc012611 fatcat:ztkttlruzzfyzaxk76csrhlwdi

A New Sea Surface Height–Based Code for Oceanic Mesoscale Eddy Tracking

Evan Mason, Ananda Pascual, James C. McWilliams
2014 Journal of Atmospheric and Oceanic Technology  
altimeters are presently available from Archiving, Validation, and Interpretation of Satellite Oceanographic (AVISO) data, providing improved resolution of mesoscale features and their variability (Pascual  ... 
doi:10.1175/jtech-d-14-00019.1 fatcat:lnqspgbmvnce7izgpuzhdeppby

Thermal Lag Correction on Slocum CTD Glider Data

Bartolomé Garau, Simón Ruiz, Weifeng G. Zhang, Ananda Pascual, Emma Heslop, John Kerfoot, Joaquín Tintoré
2011 Journal of Atmospheric and Oceanic Technology  
In this work a new methodology is proposed to correct the thermal lag error in data from unpumped CTD sensors installed on Slocum gliders. The advantage of the new approach is twofold: first, it takes into account the variable speed of the glider; and second, it can be applied to CTD profiles from an autonomous platform either with or without a reference cast. The proposed methodology finds values for four correction parameters that minimize the area between two temperature-salinity curves
more » ... by two CTD profiles. A field experiment with a Slocum glider and a standard CTD was conducted to test the method. Thermal laginduced salinity error of about 0.3 psu was found and successfully corrected. [PUBLICATION ABSTRACT] _______________________________________________________________ Texto completo Headnote ABSTRACT In this work a new methodology is proposed to correct the thermal lag error in data from unpumped CTD sensors installed on Slocum gliders. The advantage of the new approach is twofold: first, it takes into account the variable speed of the glider; and second, it can be applied to CTD profiles from an autonomous platform either with or without a reference cast. The proposed methodology finds values for four correction parameters that minimize the area between two temperature-salinity curves given by two CTD profiles. A field experiment with a Slocum glider and a standard CTD was conducted to test the method. Thermal laginduced salinity error of about 0.3 psu was found and successfully corrected. (ProQuest: ... denotes formulae omitted.)
doi:10.1175/jtech-d-10-05030.1 fatcat:ytlfczgoy5e5pmamkxpua3ftmu

Net primary production in the Gulf Stream sustained by quasi-geostrophic vertical exchanges

Ananda Pascual, Simón Ruiz, Bruno Buongiorno Nardelli, Stéphanie Guinehut, Daniele Iudicone, Joaquín Tintoré
2015 Geophysical Research Letters  
Consequently, in situ observations PASCUAL ET AL.  ...  ., 2001; Pascual et al., 2004; Pidcock et al., 2013] .  ...  PASCUAL ET AL.©2014. American Geophysical Union. All Rights Reserved. .1002/2014GL062569 PASCUAL ET AL. ©2014. American Geophysical Union.  ... 
doi:10.1002/2014gl062569 fatcat:dq65crt5yvclja3n23tfle4aem
« Previous Showing results 1 — 15 out of 165 results