1,720,971 research outputs found
Materials to re-create Predicting Surface Oscillations in Lake Superior from Normal Mode Dynamics
No full textThere are three folders (compressed in .zip format). Each folder has an associated plain-text documentation file that includes detailed information about its contents. The folders are: (1) MITgcm, (2) analysis_scripts, and (3) plotting_scripts. The first folder includes all compile-time and run-time options for the MITgcm simulations. It also includes Matlab scripts and functions to generate MITgcm input files and post-process MITgcm output files. The MITgcm source code is available at http://mitgcm.org/. The second folder contains the Matlab scripts to process tide gauge (lake level) data collected by the US and Canadian governments. The third folder contains Matlab scripts and functions that re-create the figures included in Kelly et al. (2024). All of the data needed for these scripts are included in the folder.A recent manuscript examined surface oscillations in Lake Superior using observations and the MIT general circulation model (MITgcm). This submission includes the functions to analyze the observations, the configuration and post-processing files for the MITgcm, and Matlab scripts that recreate the figures in the manuscript.National Science Foundation, OCE-PO 1635560National Aeronautics and Space Administration, 80NSSC20K1331Kelly, Samuel M. (2024). Materials to re-create Predicting Surface Oscillations in Lake Superior from Normal Mode Dynamics. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/t222-a012
Materials to re-create "Global Dynamics of the Stationary M2 Mode-1 Internal Tide" by Kelly et al.
No full textThere are three folders (compressed in .zip format). Each folder has an associated plain-text documentation file that includes detailed information about its contents. The folders are:
(1) CSW_config. This folder includes C header files for the Coupled-mode Shallow Water model (CSW). CSW and it's associated processing scripts are available at https://bitbucket.org/smkelly/. The model dynamics are described by Savage et al. (2020). These header files cannot be used without the CSW source code.
(2) post_processing. This folder includes Matlab scripts that read and consolidate data from CSW and the High Resolution Empirical Tide model (HRET). These scripts cannot be run until the CSW simulations have been completed and post_processed into Matlab data files. HRET is the property of Ed Zaron at Oregon State University. The scripts in this folder write matlab data files that are used by the scripts in the "plotting_scripts" folder.
(3) plotting_scripts. This folder contains Matlab scripts that re-create the figures included in Kelly et al. (2020). All of the data needed for these scripts are included in the folder. These scripts can be run in Matlab without any previous steps (although some color maps must be downloaded from the Matlab file exchange).In a recent manuscript, the Coupled-mode Shallow Water model (CSW) was run to examine global internal tide dynamics. This manuscript examines the sensitivity of internal-tide generation, propagation, and dissipation to model resolution, dissipation parameterizations, density stratification, surface tides, and bathymetry. This submission includes the configuration files for CSW, as well as the subset of data and Matlab scripts needed to recreate the figures and tables in the manuscript.Sponsorship: National Science Foundation, OCE-PO 1434352Sponsorship: National Aeronautics and Space Administration, NNX16AH75GKelly, Samuel M. (2020). Materials to re-create "Global Dynamics of the Stationary M2 Mode-1 Internal Tide" by Kelly et al.. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/cf80-eh04
Materials to re-create Coastal trapped waves: normal modes, evolution equations, and topographic generation
No full textThere is a Matlab function (CTW_MODES.m) and two folders (compressed in .zip format). Each folder has an associated plain-text documentation file that includes detailed information about its contents. The folders are: (1) MITgcm and (2) plotting_scripts. The first folder includes all compile-time and run-time options for the MITgcm simulations. It also includes Matlab scripts and functions to generate MITgcm input files and post-process MITgcm output files. The MITgcm source code is available at http://mitgcm.org/. The second folder contains Matlab scripts and functions that re-create the figures included in Kelly and Ogbuka (2022). All of the data needed for these scripts are included in the folder. The TPXO surface tide atlas is available at https://www.tpxo.net.A recent manuscript examined coastal trapped waves (CTWs) using theory and the MIT general circulation model (MITgcm). The manuscript developed a Matlab code to generate orthogonal CTWs and then used the code to analyze MITgcm simulations of CTW generation. This submission includes the code to generate orthogonal CTWs (CTW_modes.m), the configuration and post-processing files for the MITgcm, and Matlab scripts that recreate the figures in the manuscript.National Science Foundation, OCE-PO 1635560Kelly, Samuel M. (2022). Materials to re-create Coastal trapped waves: normal modes, evolution equations, and topographic generation. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/pt2w-sh61
A Coupled-Mode Shallow-Water Model for Tidal Analysis: Internal Tide Reflection and Refraction by the Gulf Stream
Full text linkA hydrostatic, coupled-mode, shallow-water model (CSW) is described and used to diagnose and simulate tidal dynamics in the greater Mid-Atlantic Bight region. The reduced-physics model incorporates realistic stratification and topography, internal tide forcing from a priori estimates of the surface tide, and advection terms that describe first-order interactions of internal tides with slowly varying mean flow and mean buoyancy fields and their respective shear. The model is validated via comparisons with semianalytic models and nonlinear primitive equation models in several idealized and realistic simulations that include internal tide interactions with topography and mean flows. Then, 24 simulations of internal tide generation and propagation in the greater Mid-Atlantic Bight region are used to diagnose significant internal tide interactions with the Gulf Stream. The simulations indicate that locally generated mode-one internal tides refract and/or reflect at the Gulf Stream. The redirected internal tides often reappear at the shelf break, where their onshore energy fluxes are intermittent (i.e., noncoherent with surface tide) because meanders in the Gulf Stream alter their precise location, phase, and amplitude. These results provide an explanation for anomalous onshore energy fluxes that were previously observed at the New Jersey shelf break and linked to the irregular generation of nonlinear internal waves.National Science Foundation (U.S.) (Grant OCE-1061160 (ShelfIT))National Science Foundation (U.S.) (Grant OCE-1060430)United States. Office of Naval Research (Grants N000 14-11-1-0701 (MURI- IODA))United States. Office of Naval Research (N00014-12-1-0944 (ONR6.2)
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Internal-tide interactions with the Gulf Stream and Middle Atlantic Bight shelfbreak front
Full text linkInternal tides in the Middle Atlantic Bight region are found to be noticeably influenced by the presence of the shelfbreak front and the Gulf Stream, using a combination of observations, equations, and data-driven model simulations. To identify the dominant interactions of these waves with subtidal flows, vertical-mode momentum and energy partial differential equations are derived for small-amplitude waves in a horizontally and vertically sheared mean flow and in a horizontally and vertically variable density field. First, the energy balances are examined in idealized simulations with mode-1 internal tides propagating across and along the Gulf Stream. Next, the fully nonlinear dynamics of regional tide-mean-flow interactions are simulated with a primitive-equation model, which incorporates realistic summer-mesoscale features and atmospheric forcing. The shelfbreak front, which has horizontally variable stratification, decreases topographic internal-tide generation by about 10% and alters the wavelengths and arrival times of locally generated mode-1 internal tides on the shelf and in the abyss. The (sub)mesoscale variability at the front and on the shelf, as well as the summer stratification itself, also alter internal-tide propagation. The Gulf Stream produces anomalous regions of math formula(20 mW m−2) mode-1 internal-tide energy-flux divergence, which are explained by tide-mean-flow terms in the mode-1 energy balance. Advection explains most tide-mean-flow interaction, suggesting that geometric wave theory explains mode-1 reflection and refraction at the Gulf Stream. Geometric theory predicts that offshore-propagating mode-1 internal tides that strike the Gulf Stream at oblique angles (more than thirty degrees from normal) are reflected back to the coastal ocean, preventing their radiation into the central North Atlantic.National Science Foundation (U.S.) (grant OCE-1061160 (ShelfIT))United States. Office of Naval Research (grant N00014-11-1-0701 (MURI-IODA))National Science Foundation (U.S.) (N00014-12-1-0944 (ONR6.2))National Science Foundation (U.S.) (grant N00014-13-1-0518 (Multi-DA)
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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