Characterization of the uncertainty of loop current metrics using a multidecadal numerical simulation and altimeter observations

Dukhovskoy, Dmitry S.; Leben, R. R.; Chassignet, Eric P.; Hall, Cody A.; Morey, Steven L.; Nedbor-Gross, Robert

doi:10.1016/j.dsr.2015.01.005

Cited by 53 publications

(72 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all our simulations, a weak mean northward flow is produced instead, although the standard deviation there is much higher than the mean, as in observations. In addition, the structure of the EOFs and the variance explained is also similar to observed ones (e.g., Abascal et al, 2003) and to the ones obtained in other numerical studies (e.g., Dukhovskoy et al, 2015).…”

Section: Validation Of the Model Resultssupporting

confidence: 72%

“…The comparison of the experiments with AVISO suggests that the LC extension in SMOOTH is the most similar to AVISO, but AVISO appears to have a slightly less "bimodal" distribution during the period 1996-2009. Dukhovskoy et al (2015) show, however, that a longer data record of the Colorado Center for Astro-dynamics Research (CCAR) SSH data does not have such symmetric bimodal distribution, but rather a preference for a more extended state.…”

Section: Lc Metrics Transport Through the Yucatan Channel And Eddy Smentioning

confidence: 96%

“…Observations (Lugo-Fernán-dez and Leben, 2010) indicate this separation period is longer the farther to the south the LC retreats after a shedding event, although this result may depend on the analysis period chosen (Dukhovskoy et al, 2015).…”

Section: Lc Metrics Transport Through the Yucatan Channel And Eddy Smentioning

confidence: 98%

“…This signal does not contribute to the dynamical variability of the LC, but can contaminate the estimation of the LC metrics (Dukhovskoy et al, 2015;Hamilton et al, 2015).…”

Section: Lc Metrics Transport Through the Yucatan Channel And Eddy Smentioning

confidence: 99%

“…It is based on the identification of an SSH contour that marks the core of the LC, which is then used to compute its extension (length) and the longitude and latitude of its maximum intrusion. We chose the 17 cm contour of the model SSH since it coincides with the surface velocity maximum in the model within the LC area (same contour is used by Leben (2005) and Dukhovskoy et al (2015).…”

Section: Lc Metrics Transport Through the Yucatan Channel And Eddy Smentioning

confidence: 99%

See 4 more Smart Citations

Sensitivity of Loop Current metrics and eddy detachments to different model configurations: The impact of topography and Caribbean perturbations

García-Jove¹,

Sheinbaum²,

Jouanno

2016

ATM

View full text Add to dashboard Cite

RESUMENLa dinámica de la Corriente del Lazo (LC, por sus siglas en inglés) y la separación de su remolino anticiclónico (LCE, por sus siglas en inglés) son algunas de las características más importantes de la circulación en el Golfo de México (GoM, por sus siglas en inglés), así como índices comunes para evaluar la validez de las simulaciones numéricas. Utilizando un modelo numérico se estudian la sensibilidad de la LC y las separaciones de los LCE ante tres diferentes mecanismos considerados relevantes para su comportamiento: a) eliminación de las perturbaciones de vorticidad provenientes del Caribe que entran en el GoM; b) suavizado de la topografía, y c) supresión del cañón al este del Banco de Campeche.Los principales resultados de los experimentos de sensibilidad en comparación con un experimento de referencia, considerado el más realista, son los siguientes: a. La eliminación de los remolinos del Caribe reduce el número de separaciones de LCE, pero no son el mecanismo principal que desencadena las separaciones. Las inestabilidades localmente generadas sobre el Banco de Campeche del noreste y la extensión de la LC hacia el norte parecen ser los principales mecanismos que las controlan. b. El suavizado de la topografía genera una LC más ancha y menos intensa y además reduce los términos de intercambio de energía relacionados con inestabilidades del flujo. Sin embargo, el número de separaciones de LCE es similar al experimento de referencia. La extensión de la LC controla la liberación que, en este caso, tiende a ocurrir durante el verano-otoño, cuando dicha corriente está más extendida y el transporte de Yucatán se debilita abruptamente después de su máximo estacional. c. La supresión del cañón profundo al este del Banco de Campeche produce una extensión de la LC más estable y reduce el número de separaciones de LCE. El cañón parece desempeñar un papel importante en la intensificación de los ciclones generados sobre el frente este de la LC, que conducen finalmente a una separación de LCE. La distribución estacional de las separaciones de LCE en los experimentos no parece estar determinada por la intensificación de las inestabilidades barotrópicas y baroclínicas. En cambio, una condición necesaria pero no suficiente para liberar un LCE es que la LC se extienda más allá de los 24º N. Nuestros resultados sugieren que debe tenerse precaución al interpretar las estadísticas de la LC y las separaciones de LCE obtenidas a partir de una sola configuración numérica. ABSTRACTThe dynamics of the Loop Current (LC) and the release of its anticyclonic eddy (Loop Current eddy, LCE) are some of the most important features of the circulation in the Gulf of Mexico (GoM) and key aspects to gauge the validity of numerical simulations. Using a numerical model, we investigate the sensitivity of the LC and LCE detachments to three different mechanisms deemed to be relevant to their behavior: a) suppression doi: 10.20937/ATM.2016.29.03.05 Atmósfera 29(3), 235-265 (2016) 236 M. Garcia-Jove et al.of Caribbean vorticity perturba...

show abstract

Section: Validation Of the Model Resultssupporting

confidence: 72%

Section: Lc Metrics Transport Through the Yucatan Channel And Eddy Smentioning

confidence: 96%

Section: Lc Metrics Transport Through the Yucatan Channel And Eddy Smentioning

confidence: 98%

“…This signal does not contribute to the dynamical variability of the LC, but can contaminate the estimation of the LC metrics (Dukhovskoy et al, 2015;Hamilton et al, 2015).…”

Section: Lc Metrics Transport Through the Yucatan Channel And Eddy Smentioning

confidence: 99%

Section: Lc Metrics Transport Through the Yucatan Channel And Eddy Smentioning

confidence: 99%

See 3 more Smart Citations

Sensitivity of Loop Current metrics and eddy detachments to different model configurations: The impact of topography and Caribbean perturbations

García-Jove¹,

Sheinbaum²,

Jouanno

2016

ATM

View full text Add to dashboard Cite

show abstract

Nonlocal impacts of the Loop Current on cross‐slope near‐bottom flow in the northeastern Gulf of Mexico

Nguyen

Morey

Dukhovskoy

et al. 2015

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

Cross‐slope near‐bottom motions near De Soto Canyon in the northeastern Gulf of Mexico are analyzed from a multidecadal ocean model simulation to characterize upwelling and downwelling, important mechanisms for exchange between the deep ocean and shelf in the vicinity of the 2010 BP Macondo well oil spill. Across the continental slope, large‐scale depression and offshore movement of isopycnals (downwelling) occur more frequently when the Loop Current impinges upon the West Florida Shelf slope farther south. Upwelling and onshore movement of isopycnals occurs with roughly the same likelihood regardless of Loop Current impingement on the slope. The remote influence of Loop Current on the De Soto Canyon region downwelling is a consequence of a high‐pressure anomaly that extends along the continental slope emanating from the location of Loop Current impact.

show abstract

Patterns of the loop current system and regions of sea surface height variability in the eastern Gulf of Mexico revealed by the self‐organizing maps

et al. 2016

View full text Add to dashboard Cite

The Self‐Organizing Map (SOM), an unsupervised learning neural network, is employed to extract patterns evinced by the Loop Current (LC) system and to identify regions of sea surface height (SSH) variability in the eastern Gulf of Mexico (GoM) from 23 years (1993–2015) of altimetry data. Spatial patterns are characterized as different LC extensions and different stages in the process of LC eddy shedding. The temporal evolutions and the frequency of occurrences of these patterns are obtained, and the typical trajectories of the LC system progression on the SOM grid are investigated. For an elongated, northwest‐extended, or west‐positioned LC, it is common for the LC anticyclonic eddy (LCE) to separate and propagate into the western GoM, while an initially separated LCE in close proximity to the west Florida continental slope often reattaches to the LC and develops into an elongated LC, or reduces intensity locally before moving westward as a smaller eddy. Regions of differing SSH variations are also identified using the joint SOM‐wavelet analysis. Along the general axis of the LC, SSH exhibits strong variability on time scales of 3 months to 2 years, also with energetic intraseasonal variations, which is consistent with the joint Empirical Orthogonal Function (EOF)‐wavelet analysis. In the more peripheral regions, the SSH has a dominant seasonal variation that also projects across the coastal ocean. The SOM, when applied to both space and time domains of the same data, provides a powerful tool for diagnosing ocean processes from such different perspectives.

show abstract

Characterization of the uncertainty of loop current metrics using a multidecadal numerical simulation and altimeter observations

Cited by 53 publications

References 48 publications

Sensitivity of Loop Current metrics and eddy detachments to different model configurations: The impact of topography and Caribbean perturbations

Sensitivity of Loop Current metrics and eddy detachments to different model configurations: The impact of topography and Caribbean perturbations

Nonlocal impacts of the Loop Current on cross‐slope near‐bottom flow in the northeastern Gulf of Mexico

Patterns of the loop current system and regions of sea surface height variability in the eastern Gulf of Mexico revealed by the self‐organizing maps

Contact Info

Product

Resources

About