Журнал

About Editorial Board Information for authors and reviewers Publication ethics Contacts User Account: send / review a manuscript
Archive
Volume 21, 2024
Number 1 Number 2 Number 3 Number 4 Number 5
Volume 20, 2023
Number 1 Number 2 Number 3 Number 4 Number 5 Number 6
Volume 19, 2022
Number 1 Number 2 Number 3 Number 4 Number 5 Number 6
Volume 18, 2021
Number 1 Number 2 Number 3 Number 4 Number 5 Number 6
Volume 17, 2020
Number 1 Number 2 Number 3 Number 4 Number 5 Number 6 Number 7
Volume 16, 2019
Number 1 Number 2 Number 3 Number 4 Number 5 Number 6
Volume 15, 2018
Number 1 Number 2 Number 3 Number 4 Number 5 Number 6 Number 7
Volume 14, 2017
Number 1 Number 2 Number 3 Number 4 Number 5 Number 6 Number 7
Volume 13, 2016
Number 1 Number 2 Number 3 Number 4 Number 5 Number 6
Volume 12, 2015
Number 1 Number 2 Number 3 Number 4 Number 5 Number 6
Volume 11, 2014
Number 1 Number 2 Number 3 Number 4
Volume 10, 2013
Number 1 Number 2 Number 3 Number 4
Volume 9, 2012
Number 1 Number 2 Number 3 Number 4 Number 5
Volume 8, 2011
Number 1 Number 2 Number 3 Number 4
Volume 7, 2010
Number 1 Number 2 Number 3 Number 4
Issue 6, 2009
Volume 1 Volume 2
Issue 5, 2008
Volume 1 Volume 2
Issue 4, 2007
Volume 1 Volume 2
Issue 3, 2006
Volume 1 Volume 2
Issue 2, 2005
Volume 1 Volume 2
Issue 1, 2004
Volume 1
Search
Find:
русский
ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 5, pp. 179-190

Mesoscale vortex dynamics in the Agulhas Current from satellite altimetry data

N.V. Sandalyuk 1 , T.V. Belonenko 1 
1 Saint Petersburg State University, Saint Petersburg, Russia
Accepted: 23.08.2018
DOI: 10.21046/2070-7401-2018-15-5-179-190
We present an analysis of mesoscale eddies formed predominantly in the southern part of the Agulhas Current using the two datasets: AVISO — the satellite altimetry measurements and Mesoscale Eddies in Altimeter Observations of SSH. In order to analyze the vortex generation mechanism, we examine separate eddies at the moment of their formation. We demonstrate that there are two areas with enhanced probability of vortex formation: Agulhas Retroflection region and Agulhas plateau. Eddies from these areas differ in trajectory and general propagation vector. The cyclonic eddies in the Agulhas current tend to split creating smaller mesoscale structures ― so-called child cyclonic eddies. The average physical characteristics of eddies (amplitude, rotation, speed, translocation speed, lifetime and radius) are calculated for the period of 1993–2015. It is shown that all eddies are highly nonlinear, vortices with maximum nonlinearity are observed in the eastern margin of the Agulhas plateau and in the Agulhas Retroflection region.
Keywords: altimetry, SLA, sea level anomaly, mesoscale eddies, nonlinearity parameter, Atlantic Ocean, Indian Ocean, Agulhas Current, Agulhas Retroflection
Full text

References:

  1. Belonenko T. V., Sandalyuk N. V., Sravnenie vklada lineinykh i nelineinykh effektov v izmenchivost’ urovnya okeana po sputnikovym dannym (Assessing the contribution of linear and non-linear effects in sea level variability using satellite data), Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 1, pp. 29–41.
  2. Belonenko T. V., Sandalyuk N. V., Vremennaya izmenchivost’ kharakteristik mezomasshtabnykh vikhrei v Avstralo-Antarkticheskom basseyine (po sputnikovym dannym) (Temporal variability of mesoscale eddies characteristics from satellite data in the Australian-Antarctic basin), Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, No. 4, pp. 189–199.
  3. Nezlin M. V., Solitony Rossbi (Rossby Solitons), Uspekhi fizicheskikh nauk, Vol. 150, No. 5, 1986, pp. 1–58.
  4. Nezlin M. V., Snezhkin E. N., Vikhri Rossbi i spiral’nye struktury (Rossby Vortices and Spiral Structures), Moscow, 1990, 237 p.
  5. Monin A. S., Zhiharev G. M., Okeanskie vikhri (Ocean Eddies), Uspekhi fizicheskikh nauk, 1990, Vol. 160, No. 5, pp. 1–47.
  6. Arhan M., Mercier H., Lutjeharms J. R. E., The disparate evolution of three Agulhas rings in the South Atlantic Ocean, J. Geophysical Research, 1999, Vol. 104, Issue C9, pp. 20987–21005.
  7. Boebel O., Lutjeharms J. R. E. Schmid C., Zenk W., Rossby T., Barron C., The Cape Cauldron: a regime of turbulent inter-ocean exchange, Deep-Sea Research II, 2003, Vol. 50, Issue 1, pp. 57–86.
  8. Byrne D. A., Gordon A. L., Haxby W. F., Agulhas Eddies: a synoptic view using Geosat ERM data, J. Physical Oceanography, 1995, Vol. 25, Issue 5, pp. 902–917.
  9. Chelton D. B., Schlax M. G., Samelson R. M., de Szoeke R. A., Global observations of large oceanic eddies, Geophysical Research Letters, 2007, Vol. 34, No. 15.
  10. Chelton D. B., Schlax M. G., Samelson R. M., Global observations of nonlinear mesoscale eddies, Progress in Oceanography, 2011, Vol. 91, Issue 2, pp. 167–216.
  11. Hall C., Lutjeharms J. R. E., Cyclonic eddies identified in the Cape Basin of the South Atlantic Ocean, J. Marine Systems, 2011, Vol. 85, pp. 1–10.
  12. Lutjeharms J. R. E., The Agulhas Current, Berlin, Heidelberg: Springer, 2006, 330 p.
  13. Lutjeharms J. R. E., Three decades of research on the greater Agulhas Current, Ocean Science, 2007, Vol. 3, Issue 1, pp. 129–147.
  14. Lutjeharms J. R. E., Valentine H. R., Evidence for persistent Agulhas rings southwest of Cape Town, South African J. Science, 1988, Vol. 84, pp. 781–783.
  15. Lutjeharms J. R. E., van Ballegooyen R. C., The retroflection of the Agulhas Current, J. Physical Oceanography, 1988, Vol. 18, pp. 1570–1583.
  16. Nof D., The role of angular momentum in the splitting of isolated eddies, Tellus Series A: Dynamic Meteorology and Oceanography, 1990, Vol. 42, Issue 4, pp. 469–481.
  17. Olson D. B., Evans R. H., Rings of the Agulhas Current, Deep-Sea Research, 1986, Vol. 33, Issue 1, pp. 27–42.
  18. Samelson R. M., Wiggins S., Lagrangian Transport in Geophysical Jets and Waves: The Dynamical Systems Approach, New York: Springer, 2006, 147 p.
  19. Schouten M. W., de Ruijter W. P. M., van Leeuwen P. J., Lutjeharms J. R. E., Translation, decay and splitting of Agulhas rings in the south-eastern Atlantic Ocean, J. Geophysical Research, 2000, Vol. 105, Issue C9, pp. 21913–21925.