The influence of Gulf of Mexico Loop Current intrusion on the transport of the Florida Current

Lin, Yuehua; Greatbatch, Richard John; Jiang, Sheng

doi:10.1007/s10236-010-0308-0

Cited by 18 publications

(19 citation statements)

References 31 publications

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“…By contrast, Lin et al (2010) model results have a higher Yucatan transport in LC retracted mode conditions. They only study LC transport fluctuations and link them the topographic from drag, associated to the pressure differences across the ridge in the Florida Straits produced by density anomalies from LC intrusions.…”

Section: Introductionmentioning

confidence: 73%

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

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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...

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Section: Introductionmentioning

confidence: 73%

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

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“…These variations were estimated around 5 Sv, which is of similar magnitude as the ones estimated from direct mooring measurements and higher than the 2 Sv suggested by Rousset and Beal []. If cable transport measurements of the Gulf Stream at 27°N are assumed valid, this implies flow compensation through the OB and NWP channels higher than 2 Sv when Yucatan transport is low [see also Lin et al ., ]. Surface geostrophic velocity anomalies along these channels computed from CTOH altimetry data suggest such compensation.…”

Section: Discussionmentioning

confidence: 94%

“…Figure illustrates that low‐frequency variations of the surface flow at Yucatan Channel estimated from moorings and altimetry are in qualitative agreement, despite the difference in transports during the 1999–2001 and 2010–2011 periods. Such agreement suggests the possibility of calculating a transport proxy based on cross‐channel sea level differences, as has been done in other western boundary currents [ Maul et al ., ; Imawaki et al ., ; Lin et al ., ; Yang et al ., ]. However, conditions at Yucatan are not as clear as in other channels as the scatter of monthly mean transport values (calculated for each CANEK period separately) versus the corresponding Cuba‐Yucatan sea level difference illustrates (Figure (top), green crosses and regression line, r = 0.48).…”

Section: Discussionmentioning

confidence: 99%

Interannual variability in the Yucatan Channel flow

Athié

Sheinbaum

Leben

et al. 2015

Geophysical Research Letters

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to June 2013 yield a mean transport of 27 and 25 Sv, respectively, with a subinertial standard deviation of 3.5 Sv. These mean transport values are higher than the 23 Sv reported from 21 months of similar measurements (1999)(2000)(2001). Analysis of low-frequency variations of a transport proxy based on 20 years of altimetry data indicates that during 1999-2001, the flow through Yucatan Channel was anomalously low. This suggests that a sizable compensation through other channels off the Gulf of Mexico is required to match the transport cable measurements of the Florida Current at 27°N.

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“…The strong intraannual to interannual variability of the Florida Current results from internal ocean variability driven by mesoscale eddies (Lin et al 2010;Mildner et al 2011, manuscript submitted to Geophys. Res.…”

Section: May 2012 C Z E S C H E L E T a Lmentioning

confidence: 99%

On the Driving Mechanism of the Annual Cycle of the Florida Current Transport

Czeschel

Eden²,

Greatbatch

2012

Journal of Physical Oceanography

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The mechanisms involved in setting the annual cycle of the Florida Current transport are revisited using an adjoint model approach. Adjoint sensitivities of the Florida Current transport to wind stress reproduce a realistic seasonal cycle with an amplitude of ;1.2 Sv (1 Sv [ 10 6 m 3 s 21 ). The annual cycle is predominantly determined by wind stress forcing and related coastal upwelling (downwelling) north of the Florida Strait along the shelf off the North American coast. Fast barotropic waves propagate these anomalies southward and reach the Florida Strait within a month, causing an amplitude of ;1 Sv. Long baroclinic planetary Rossby waves originating from the interior are responsible for an amplitude of ;0.8 Sv but have a different phase. The sensitivities corresponding to the first baroclinic mode propagate westward and are highly influenced by topography. Considerable sensitivities are only found west of the Mid-Atlantic Ridge, with maximum values at the western shelf edge. The second baroclinic mode also has an impact on the Florida Current variability, but only when a mean flow is present. A second-mode wave train propagates southwestward from the ocean bottom on the western side of the Mid-Atlantic Ridge between ;368 and 468N and at Flemish Cap, where the mean flow interacts with topography, to the surface. Other processes such as baroclinic waves along the shelf and local forcing within the Florida Strait are of minor importance.

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The influence of Gulf of Mexico Loop Current intrusion on the transport of the Florida Current

Cited by 18 publications

References 31 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

Interannual variability in the Yucatan Channel flow

On the Driving Mechanism of the Annual Cycle of the Florida Current Transport

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