Location of Repository

Mesoscale subduction at the Almeria-Oran front. Part 1: ageostrophic flow

By J.T. Allen, D.A. Smeed, J. Tintore and S. Ruiz

Abstract

This paper presents a detailed diagnostic analysis of hydrographic and current meter data from three, rapidly repeated, fine-scale surveys of the Almeria-Oran front. Instability of the frontal boundary, between surface waters of Atlantic and Mediterranean origin, is shown to provide a mechanism for significant heat transfer from the surface layers to the deep ocean in winter. The data were collected during the second observational phase of the EU funded OMEGA project on RRS Discovery cruise 224 during December 1996. High resolution hydrographic measurements using the towed undulating CTD vehicle, SeaSoar,. traced the subduction of Mediterranean Surface Water across the Almeria-Oran front. This subduction is shown to result from a significant baroclinic component to the instability of the frontal jet. The Q-vector formulation of the omega equation is combined with a scale analysis to quantitatively diagnose vertical transport resulting from mesoscale ageostrophic circulation. The analyses are presented and discussed in the presence of satellite and airborne remotely sensed data; which provide the basis for a thorough and novel approach to the determination of observational error

Topics: GC
Year: 2001
OAI identifier: oai:eprints.soton.ac.uk:324
Provided by: e-Prints Soton

Suggested articles

Preview

Citations

  1. (1994). Eddies and mixing at the Iceland-Færœs Front. doi
  2. (1995). Subtidal and tidal currents in the vicinity of the Iceland-Færœs Front. doi
  3. (1996). Potential vorticity and vertical velocity at the Iceland Færœs Front. doi
  4. (2000). Diagnosing vertical velocities with the QG omega equation: an examination of the errors due to sampling strategy. Deep Sea Res. doi
  5. (1990). The origin and characteristics of the Algerian Current. doi
  6. (1998). The OMEGA atlas of remotely sensed data.
  7. (2001). A study of the Alboran Sea mesoscale system by means of empirical orthogonal function decomposition of satellite data. doi
  8. (1995). Characteristics and circulation of the surface and intermediate water masses off Algeria. Deep Sea Res. doi
  9. (1998). The general circulation in the Mediterranean Sea: a climatological approach, doi
  10. (1994). The surface temperature field and dynamical structure of the Almeria-Oran front from simultaneous shipboard and satellite data. doi
  11. (1994). Mesoscale instability and upwelling. Part 1: Observations at the North Atlantic Intergyre Front. doi
  12. (2001). Mesoscale subduction at the Almeria-Oran front. Part 2: biophysical interactions. doi
  13. (1998). The drift of Modified Atlantic Water from the Alboran Sea to the eastern Mediterranean. doi
  14. (1978). Mediterranean deep water formation baroclinic instability and oceanic eddies.
  15. (1985). Water masses and circulation doi
  16. (1982). Atmosphere-Ocean Dynamics (International geophysics series doi
  17. (2001). Diagnostic analysis of the 3D ageostrophic circulation from a multivariate spatial interpolation of CTD and ADCP data. Deep Sea Res. doi
  18. (1990). Variations in the structure of the anticyclonic gyres found in the Alboran Sea. doi
  19. (1972). Atmospheric frontogenesis models: mathematical formulation and solution. doi
  20. (1975). The geostrophic momentum approximation and the semigeostrophic approximation. doi
  21. (1978). A new look at the ω-equation. doi
  22. (1998). The Southampton Oceanography Centre (SOC) ocean - atmosphere heat, momentum and freshwater flux atlas.
  23. (1999). New insights into the ocean heat budget closure problem from analysis of the SOC air-sea flux climatology. doi
  24. (1984). Wave propagation and growth on a surface front in a two layer geostrophic current. doi
  25. (1987). The diagnosis of synoptic-scale vertical motion in the seasonal thermocline. doi
  26. (1990). The Algerian eddies. doi
  27. (2000). Spirals on the sea. doi
  28. (2000). Mesoscale subduction at the Antarctic Polar Front driven by baroclinic instability. doi
  29. (2000). Eddy-induced mixed layer shallowing and mixed layer/thermocline exchange. doi
  30. (1996). A study of the omega equation for diagnosing vertical motions at ocean fronts. doi
  31. (1999). The role of winter intermediate waters in the spring-summer circulation of the Balearic Sea. 1. Hydrography and inverse box modeling. doi
  32. (1986). Frontal surveys with a towed profiling conductivity/temperature/ depth measurement package (SeaSoar). doi
  33. (1992). Vorticity and vertical circulation at an ocean front. doi
  34. (1997). Biological and Physical investigations in the region of the Almeria-Oran Front (Western Mediterranean). Southampton Oceanography Centre
  35. (2001). Diagnosis of vertical velocities with the QG Omega Equation: a relocation method to obtain pseudo-synoptic data sets. doi
  36. (1996). Intensive surveys of the Azores Front 2. Inferring the geostrophic and vertical velocity fields. doi
  37. (1993). Linear instability of a mixed-layer front. doi
  38. (2000). Upwelling mechanisms in the northwestern Alboran Sea. doi
  39. (1999). Diagnosis of the threedimensional circulation associated with mesoscale motion in the California Current. doi
  40. (1997). ERS, shipborne and aircraft observations of circulation in the region of the Almeria-Oran front.
  41. (1997). Baroclinic jets in confluent flow. doi
  42. (1994). Mesoscale instability and upwelling. Part 2: Testing the diagnostics of vertical motion with a three-dimensional ocean front model. doi
  43. (1988). Surface circulation in the Algerian basin during doi
  44. (1988). A study of an intense density front in the eastern Alboran Sea: the Almeria-Oran front. doi
  45. (1991). Mesoscale dynamics and vertical motion in the Alboran Sea. doi
  46. (1996). Circulation in the Alboran Sea as determined by quasi-synoptic hydrographic observations. Part I. Three-dimensional structure of the two anticyclonic gyres. doi
  47. (1996). Circulation in the Alboran Sea as determined by quasi-synoptic hydrographic observations. Part II. Mesoscale ageostrophic motion diagnosed through density dynamical assimilation. doi
  48. (1998). On the upper layer circulation in the Alboran Sea. doi
  49. (2000). A study of the balance of horizontal momentum in a vertical shearing current. doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.