Evolution of a synoptic-scale vortex advecting toward a high mountain

Article English OPEN
Schwierz, Cornelia B. ; Davies, Huw C. (2011)
  • Publisher: Co-Action Publishing
  • Journal: Tellus A (issn: 1600-0870, eissn: 0280-6495)
  • Related identifiers: doi: 10.3402/tellusa.v55i2.12091
  • Subject:
    arxiv: Physics::Geophysics | Physics::Fluid Dynamics | Physics::Atmospheric and Oceanic Physics | Condensed Matter::Superconductivity

A model-based study is undertaken of a synoptic-scale vortex’s encounter with Greenland-scale topography. The ambient setting is a barotropic westerly flow of uniform potential vorticity. This flow is both incident upon and induces an anticyclone over the topography, and it also serves to advect the vortex toward the mountain. In a simulated evolution of the flow the vortex circumnavigates poleward around the mountain but concomitantly undergoes significant dissolution on the windward side followed by a substantial reconstitution to the lee. It eventually advects away downstream as a compact vortex of reduced amplitude. This sequence of events is interpreted in terms of the combined influence of the orographic anticyclone and the self-dynamics of the vortex.DOI: 10.1034/j.1600-0870.2003.01396.x
  • References (31)
    31 references, page 1 of 4

    Beismann, J. O., Kase, R. H. and Lutjeharms, J. R. E. 1999. On the influence of submarine ridges on translation and stability of Agulhas rings. J. Geophys. Res. 104, 7897- 7906.

    Davies, H. C. 1995. Orography and the breakdown of balanced flow. In: Modern dynamical meteorology (ed. P. D. Ditlevsen). ECMWF Publications, 149-154.

    Davies, H. C. and Rossa, A. M. 1998. PV frontogenesis and upper-tropospheric fronts. Mon. Wea. Rev. 126, 1528- 1539.

    Doyle, J. D. and Shapiro, M. A. 1999. Flow response to largescale topography: the Greenland tip jet. Tellus 51A, 728- 748.

    Dritschel, D. G. 1988. The repeated filamentation of twodimensional vorticity interfaces. J. Fluid Mech. 194, 511- 547.

    Fehlmann, R. 1997. Dynamics of Seminal PV Elements. PhD thesis. Swiss Federal Institute of Technology (ETH). Dissertation N. 12229.

    Gan, M. A. and Rao, V. B. 1994. The influence of the Andes Cordillera on transient disturbances. Mon. Wea. Rev. 122, 1141-1157.

    Hsu, H.-H. 1987. Propagation of low-level circulation features in the vicinity of mountain ranges. Mon. Wea. Rev. 115, 1864-1892.

    Kamenkovich, V., Leonov, Y. P., Nechaev, D. A., Byrne, D. A. and Gordon, A. L. 1996. On the influence of bottom topography on the Agulhas eddy. J. Phys. Ocean. 26, 892-912.

    Kristja´nsson, J. E. and McInnes, H. 1999. The impact of Greenland on cyclone evolution in the North Atlantic. Q. J. R. Meteorol. Soc. 125, 2819-2834.

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