23 research outputs found
Influence of frontal cyclone evolution on the 2009 (Ekman) and 2010 (Franklin) Loop Current eddy detachment events
The anticyclonic Loop Current Eddy (LCE) shedding events are strongly
associated with the evolution of Loop Current Frontal Eddies (LCFEs) over
the eastern Gulf of Mexico (GoM). A numerical simulation, in tandem with in situ
measurements and satellite data, was used to investigate the Loop Current
(LC) evolution and the surrounding LCFE formation, structure, growth and
migration during the Eddy Ekman and Eddy Franklin shedding events in the
summers of 2009 and 2010, respectively. During both events, northern GoM
LCFEs appeared vertically coherent to at least 1500 m in temperature
observations. They propagated towards the base of the LC, where, together
with the migration of Campeche Bank (southwest GoM shelf) eddies from south
of the LC, contributed to its "necking-down". Growth of Campeche Bank
LCFEs involved in Eddy Franklin was partially attributed to Campeche Bank
waters following upwelling events. Slope processes associated with such
upwelling included offshore exports of high positive potential vorticity
that may trigger cyclone formation and growth. The advection and growth of
LCFEs, originating from the northern and southern GoM, and their interaction
with the LC over the LCE detachment area favor shedding conditions and may
contribute to the final separation of the LCE
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Evolution of a buoyant outflow in the presence of complex topography: The Dardanelles plume (North Aegean Sea)
The outflow of Waters of Black Sea origin (BSW) through the Dardanelles Strait is the strongest buoyant input for the North Aegean Sea (NAS). Two opposing flows exist across the Dardanelles exit: a lighter, upper layer outflow (BSW) and a denser, deeper layer inflow (waters of Mediterranean origin). This study examines the processes influencing the plume development and evolution. The complex topography of the receiving basin (NAS) plays a significant role on the preferred BSW pathways that are controlled by the buoyancy and wind forcing. A high‐resolution numerical model, the NAS‐HYCOM (Hybrid Coordinate Ocean Model), is implemented to perform process‐oriented experiments that examine the relative role of the forcing factors and topographic effects. Three major pathways are identified. In the absence of wind, an anticyclonic bulge is formed inducing a Westward Jet that is topographically guided between two islands near the outflow. Topography also controls the development of a buoyancy‐driven Coastal Current and a Rim Current along the North Aegean shelf areas. Comparison of model results to analytical calculations suggests that topography modifies the formation and the ballooning of the anticyclonic bulge, which are controlled by the outflow rate, the resulting stratification and Coriolis. Experiments also employ several wind directions and magnitudes in combination with different outflow characteristics. The study elucidates the importance of the Aegean morphology on the processes controlling the coupling to the Black Sea. The BSW are found to influence both deep and shelf Aegean basins, along their overall cyclonic pathway toward the eastern Mediterranean.
Key Points
Black Sea Waters propagation on North Aegean Sea (NAS)
NAS‐HYCOM (Hybrid Coordinate Ocean Model) performs process oriented experiments
Processes influencing the plume development and evolutio
Influence of frontal cyclone evolution on the 2009 (Ekman) and 2010 (Franklin) Loop Current eddy detachment events
The anticyclonic Loop Current Eddy (LCE) shedding events are strongly
associated with the evolution of Loop Current Frontal Eddies (LCFEs) over
the eastern Gulf of Mexico (GoM). A numerical simulation, in tandem with in situ
measurements and satellite data, was used to investigate the Loop Current
(LC) evolution and the surrounding LCFE formation, structure, growth and
migration during the Eddy Ekman and Eddy Franklin shedding events in the
summers of 2009 and 2010, respectively. During both events, northern GoM
LCFEs appeared vertically coherent to at least 1500 m in temperature
observations. They propagated towards the base of the LC, where, together
with the migration of Campeche Bank (southwest GoM shelf) eddies from south
of the LC, contributed to its "necking-down". Growth of Campeche Bank
LCFEs involved in Eddy Franklin was partially attributed to Campeche Bank
waters following upwelling events. Slope processes associated with such
upwelling included offshore exports of high positive potential vorticity
that may trigger cyclone formation and growth. The advection and growth of
LCFEs, originating from the northern and southern GoM, and their interaction
with the LC over the LCE detachment area favor shedding conditions and may
contribute to the final separation of the LCE
Influence of frontal cyclones evolution on the 2009 (Ekman) and 2010 (Franklin) Loop Current Eddy detachment events
The anticyclonic Loop Current Eddy (LCE) shedding events are strongly associated with the
evolution of Loop Current Frontal Eddies (LCFEs) over the eastern Gulf of Mexico
(GoM). A numerical simulation, in tandem with in situ measurements and satellite data, was used to
investigate the Loop Current (LC) evolution and the surrounding LCFEs formation, structure, growth
and migration during the Eddy Ekman and Eddy Franklin shedding events in the summers of 2009 and
2010, respectively. During both events, Northern GoM LCFEs appeared vertically coherent to at
least 1500 m in temperature observations. They propagated towards the base of the LC
where, together with the migration of Campeche Bank eddies from south of the LC, contributed
to its "necking down". Growth of Campeche Bank LCFEs involved in Eddy Franklin was partially
attributed to Campeche Bank waters following upwelling events. Slope processes associated with
such upwelling include offshore exports of high positive vorticity that may trigger cyclone
formation and growth. The advection and growth of LCFEs, originating from the northern and
southern GoM, and their interaction with the LC over the LCE detachment area favor shedding
conditions and may lead to the final separation of the LCE
Enabling risk assessment and analysis by event detection in dementia patients using a reconfigurable rule set
Chronic mental illnesses pose a great burden on the lives of citizens worldwide. In modern health-care, decentralization and enabling the self management of patients at home are crucial factors in improving the every-day lives of patients and the people close to them. People in general tend to dislike obtrusive monitoring on their daily activities, so how can we implement a platform that can provide clinicians with adequate and concise information on their patients health status and at the same time be unobtrusive and easy to use. Moreover, how can we make such an unobtrusive system capable of providing the doctor with highimpact warnings on the patient's health status only when it is needed, thus relieving him of unnecessary workload? In this paper, the authors present a reconfigurable Event Detection mechanism used in the ALADDIN platform for Risk Assessment and Analysis
In Situ Measurements of Circulation Features Influencing Cross-Shelf Transport Around Northwest Cuba
We analyzed circulation processes sampled in the Gulf of Mexico in May 2016 by the National Oceanic and Atmospheric Administration (NOAA) Ship Nancy Foster. This data set is one of the first in situ surveys in Cuban waters available to the international community. Along northwest Cuba, these data suggested coastal upwelling and revealed, for the first time, a ~50 km diameter Cuban ANticyclonic (CubAN) eddy and a ~25 km diameter cyclonic eddy, which together advected upwelled waters offshore. The CubAN eddy was associated with downwelling, and the cyclonic eddy with upwelling. At the western tip of Cuba, local currents were predominantly anticyclonic, presumably due to the proximity of the retracted Loop Current, with limited export of coastal waters. Conversely, additional data from two cruises when the Loop Current was extended showed cyclonic circulation within upwelling filaments extending far offshore. These processes are important, as they can potentially entrain marine organism larvae from local reefs into the Loop Current system and to other reef ecosystems of the region. They might also affect the transport of pollutants, as hydrocarbons in case of a spill in Cuban waters. The 2016 cruise took place after the shedding of a Loop Current Ring, which involved an unusually large (~250 km) cyclonic frontal eddy. The eddy signature was observed down to 1,200 m depth, deeper than the Loop Current. A surface drifter revealed a low relative vorticity (0.19 f) inside the eddy. Along its southern edge, filaments exported from the Campeche Bank were associated with high relative chlorophyll a at 3,060 m depth