On the Use of Thermal Images for Circulation Studies: Applications to the Eastern Mediterranean Basin

Taupier‐Letage, Isabelle

doi:10.1007/978-1-4020-6772-3_12

Cited by 26 publications

(32 citation statements)

References 13 publications

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“…During those, years several merging events between the IEs were identified and indicated with a red and dashed vertical line in Figure . We first recover some mergings that were mentioned in previous studies: in October 1997 the newly IE97 merges with the preexisting IE96 (Hamad et al, ) and at the end of June 2006 the IE05 merged with the newly formed IE06 (Mkhinini et al, ; Taupier‐Letage, ). Moreover, in late August 2009, the newly IE09 merges with the IE08 after 4 months of detection.…”

Section: Lifetime Of the Ierapetra Anticyclonementioning

confidence: 78%

“…The EGYPT‐1 campaign was held in April 2006 within the frame of the EGYPT (Eddies and GYres Paths Tracking) and EGITTO observational programs to study the role of the mesoscale eddies on the general circulation in the Eastern Basin (Taupier‐Letage et al, ). Among the 125 CTD casts performed, one section crossed the Ierapetra eddy generated in 2005 (Taupier‐Letage, ), with 18 CTD profiles every 8–10 km along a total distance of 180 km. This hydrologic transect provides useful information on the vertical structure of IE05 and allows to compute the geostrophic velocities across the anticyclone.…”

Section: Methodsmentioning

confidence: 99%

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Dynamical Evolution of Intense Ierapetra Eddies on a 22 Year Long Period

Ioannou

Stegner

et al. 2017

JGR Oceans

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Considered as wind forced, the recurrent formation of Ierapetra eddy affects the Eastern Mediterranean Sea circulation. Even though this large, coherent, and long‐lived anticyclone has been extensively studied, there are only few quantitative information on its dynamical characteristics. The main goal of this study is to quantify the Ierapetra eddies (IEs) intensity and examine their seasonal and interannual variability over a 22 year period (1993–2014). We choose the automatic eddy detection algorithm AMEDA to estimate the main IEs dynamical parameters such as their size, their intensities, and their lifetimes. Applied to daily AVISO altimetric products, the AMEDA allows a full eddy characterization providing additional information on vortex velocity profiles as well as on merging and splitting events. Among the years of observations, the IEs Rossby number experience a strong variability and could vary by a factor 4 (Ro = 0.07–0.27). This is mainly due to the eddy velocity variations rather than size variations. Moreover, we found that after their formation IEs could reintensify. This intensification process may lead to a doubling of the vortex intensity in less than 4 months. That extra input of energy coincides with the Etesian winds period. Such high intensities are not expected from large‐scale anticyclones and require cyclogeostrophic corrections. Considering this ageostrophic part, the maximum values of the core vorticity were derived and we found that the IEs might sometimes exhibit a negative potential vorticity core. Evidences on the eddy intensity from two oceanographic campaigns suggest that the IEs are probably more intense than we even estimate.

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Section: Lifetime Of the Ierapetra Anticyclonementioning

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Dynamical Evolution of Intense Ierapetra Eddies on a 22 Year Long Period

Ioannou

Stegner

et al. 2017

JGR Oceans

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“…Overall, in the eastern basin of the Med, the NO 3 subsurface variability could be directly explained by the recurrent, though chaotic and episodic, occurrence of mesoscale structures, which are persistently detected in the basin [e.g., D'Ortenzio et al ., ; Hamad et al ., ; Taupier‐Letage , ; Hamad et al ., ; Millot and Taupier‐Letage , ]. Such processes are almost impossible to observe with traditional shipboard hydrographic methods, being too weak and too rapid to be detected, and largely underestimated, on a global scale [ McGillicuddy and Robinson , ; McGillicuddy et al ., ].…”

Section: Discussionmentioning

confidence: 99%

Seasonal variability of nutrient concentrations in the Mediterranean Sea: Contribution of Bio‐Argo floats

Fommervault

D’Ortenzio

Mangin³

et al. 2015

JGR Oceans

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In 2013, as part of the French NAOS (Novel Argo Oceanic observing System) program, five profiling floats equipped with nitrate sensors (SUNA‐V2) together with CTD and bio‐optical sensors were deployed in the Mediterranean Sea. At present day, more than 500 profiles of physical and biological parameters were acquired, and significantly increased the number of available nitrate data in the Mediterranean Sea. Results obtained from floats confirm the general view of the basin, and the well‐known west‐to‐east gradient of oligotrophy. At seasonal scale, the north western Mediterranean displays a clear temperate pattern sustained by both deep winter mixed layer and shallow nitracline. The other sampled areas follow a subtropical regime (nitracline depth and mixed layer depth are generally decoupled). Float data also permit to highlight the major contribution of high‐frequency processes in controlling the nitrate supply during winter in the north western Mediterranean Sea and in altering the nitrate stock in subsurface in the eastern basin.

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“…The detection of the ATC and AIS signatures is particularly challenging due to their high space‐time variability and the lack of regular in situ observations. These circulation features have only been partially observed using remotely sensed data (temperature satellite images [e.g., Taupier‐Letage , ] and chlorophyll data [e.g., Ciappa , ]) and in situ observations, mainly drifting buoys [ Poulain and Zambianchi , ] and Acoustic Doppler Current Profilers, in synergy with numerical modeling [e.g., Ben Ismail et al ., ; Molcard et al ., ]. Satellite altimetry now provides more than two decades of synoptic measurements of sea level variations and has allowed major advances in the knowledge of the general circulation of the oceans [e.g., Fu and Smith , ; Fu and Morrow , ].…”

Section: Introductionmentioning

confidence: 99%

Exploiting coastal altimetry to improve the surface circulation scheme over the central Mediterranean Sea

et al. 2016

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This work is the first study exploiting along track altimetry data to observe and monitor coastal ocean features over the transition area between the western and eastern Mediterranean Basins. The relative performances of both the AVISO and the X‐TRACK research regional altimetric data sets are compared using in situ observations. Both products are cross validated with tide gauge records. The altimeter‐derived geostrophic velocities are also compared with observations from a moored Acoustic Doppler Current Profiler. Results indicate the good potential of satellite altimetry to retrieve dynamic features over the area. However, X‐TRACK shows a more homogenous data coverage than AVISO, with longer time series in the 50 km coastal band. The seasonal evolution of the surface circulation is therefore analyzed by conjointly using X‐TRACK data and remotely sensed sea surface temperature observations. This combined data set clearly depicts different current regimes and bifurcations, which allows us to propose a new seasonal circulation scheme for the central Mediterranean. The analysis shows variations of the path and temporal behavior of the main circulation features: the Atlantic Tunisian Current, the Atlantic Ionian Stream, the Atlantic Libyan Current, and the Sidra Gyre. The resulting bifurcating veins of these currents are also discussed, and a new current branch is observed for the first time.

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On the Use of Thermal Images for Circulation Studies: Applications to the Eastern Mediterranean Basin

Cited by 26 publications

References 13 publications

Dynamical Evolution of Intense Ierapetra Eddies on a 22 Year Long Period

Dynamical Evolution of Intense Ierapetra Eddies on a 22 Year Long Period

Seasonal variability of nutrient concentrations in the Mediterranean Sea: Contribution of Bio‐Argo floats

Exploiting coastal altimetry to improve the surface circulation scheme over the central Mediterranean Sea

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