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Izvestiya, Atmospheric and Oceanic Physics

, Volume 54, Issue 9, pp 1062–1067 | Cite as

Long-Term Sea Surface Temperature Trends in the Canary Upwelling Zone and their Causes

  • A. B. PolonskyEmail author
  • A. N. Serebrennikov
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Abstract

Long-term trends in the sea surface temperature in the Canary upwelling zone and their causes are analyzed on the basis of satellite data from the 1980s until the present. It is shown that the wind activity has strengthened near the northwestern African coast during last 30 years, which is accompanied by local intensification of wind-driven upwelling. The northeastern trade wind weakens in the open Tropical Atlantic, along with the horizontal heat advection in the upper ocean layer, which leads to a decrease in the area of the upwelling waters. As a result, both tendencies partly compensate one another when the temperature is averaged over the region in the northeastern Tropical Atlantic (between 10°–30° N, 10°–25° W).

Keywords:

upwelling ocean surface temperature thermal index of upwelling northeast trade wind space-time wind field variability 

Notes

ACKNOWLEDGMENTS

We are grateful to the anonymous reviewer for constructive criticism of the first version of this paper. The work was performed within the Fundamental Research of Climate Processes that Determine Global and Regional Spatio-temporal Variations in the Environment State Assignment (no. 0012-2014-0009).

REFERENCES

  1. 1.
    Bakun, A., Global climate change and intensification of coastal ocean upwelling, Science, 1990, vol. 247, pp. 198–201.CrossRefGoogle Scholar
  2. 2.
    Bulgakov, N.P., Polonsky, A.B., Popov, Yu.I., Artamonov, Yu.V., and Nikiforova, V.P., Variability of the temperature field off the northwestern coast of Africa, in International Symposium on Upwelling off West Africa, Barcelona: Inst. Inv. Pesq., 1985, vol. 1, pp. 79–92.Google Scholar
  3. 3.
    Chang, P., Yamagata, T., Schopf, P., Behera, S.K., Carton, J., Kessler, W.S., Meyers, G., Qu, T., Schott, F., Shetye, S., and Xie, S.-P., Climate fluctuations of tropical coupled systems: The role of ocean dynamics, J. Clim., 2006, vol. 19, no. 20, pp. 5122–5174.CrossRefGoogle Scholar
  4. 4.
    Desbiollesa, F., Bentamya, A., Blanke, B., Roy, C., Mestas-Nuñez, A.M., Grodsky, S.A., Herbette, S., Cambon, G., and Maes, C., Two decades [1992–2012] of surface wind analyses based on satellites scatterometer observations, J. Mar. Syst., 2017, no. 168, pp. 38–56.Google Scholar
  5. 5.
    Enfield, D. and Mestas-Nuñez, A.M., Multiscale variability in global SST and their relationships with tropospheric climate patterns, J. Clim., 1999, vol. 12, no. 9, pp. 2719–2733.CrossRefGoogle Scholar
  6. 6.
    Hempel, G., The Canary Current: Studies of an upwelling system, Rapp. P.-V. Reun. - Cons. Int. Explor. Mer, 1982, vol. 180, pp. 7–8. Google Scholar
  7. 7.
    https://podaac.jpl.nasa.gov/. Google Scholar
  8. 8.
    http:// www.ncep.noaa.gov/.Google Scholar
  9. 9.
    IPCC WGI AR5, 2013, ch. 2: Observations: Atmosphere and Surface.Google Scholar
  10. 10.
    IPCC WGII AR5, 2014,ch. 6: Ocean Systems.Google Scholar
  11. 11.
    Mittelstaedt, E., The upwelling area off northwest Africa a description of phenomena related to coastal upwelling, Prog. Oceanogr., 1983, vol. 12, pp. 307–331.CrossRefGoogle Scholar
  12. 12.
    Polonsky, A.B., Rol’ okeana v izmeneniyakh klimata (The Role of the Ocean in Climate Changes), Kiev: Naukova Dumka, 2008.Google Scholar
  13. 13.
    Polonsky, A.B. and Serebrennikov, A.N., Interannual and intramonthly fluctuations of the wind field and ocean surface temperature in the zone of West African upwelling according to satellite data, Issled. Zemli Kosmosa, 2017a, no. 5, pp. 14–19.Google Scholar
  14. 14.
    Polonsky, A.B. and Serebrennikov, A.N., Low-frequency variability of the wind field, geostrophic currents, and ocean surface temperature in the Canary Upwelling region from satellite data, in Sistemy kontrolya okruzhayushchei sredy (Environmental Control Systems), Sevastopol: IPTS, 2017b, vol. 7, no. 27, pp. 75–82.Google Scholar
  15. 15.
    Polonsky, A.B. and Sukhonos, P.A., Evaluation of the heat balance constituents of the upper mixed layer in the North Atlantic, Izv., Atmos. Ocean. Phys., 2016, vol. 52, no. 6, pp. 649–658.CrossRefGoogle Scholar
  16. 16.
    Relvas, P., Luis, J., and Santos, A.M.P., Importance of the mesoscale in the decadal changes observed in the northern canary upwelling system, Geophys. Res. Lett., 2009, vol. 36, L22601.CrossRefGoogle Scholar
  17. 17.
    Santos, A.M.R., Kazmin, A.S., and Peliz, A., Decadal changes in the Canary Upwelling System as revealed by satellite observations: Their impact on productivity, J. Mar. Res., 2005, vol. 63, no. 2, pp. 359–379.CrossRefGoogle Scholar
  18. 18.
    Santos, F., deCastro, M., Gómez -Gesteira, M., and Alvarez, I., Differences in coastal and oceanic SST warming rates along the Canary upwelling ecosystem from 1982 to 2010, Cont. Shelf Res., 2012, vol. 47, pp. 1–6.CrossRefGoogle Scholar
  19. 19.
    Schlesinger, M.E. and Ramankutty, N., An oscillation in the global climate system of period 65–70 years, Nature, 1994, vol. 367, pp. 723–726.CrossRefGoogle Scholar
  20. 20.
    Upwelling: Mechanisms, Ecological Effects and Threats to Biodiversity, Fischer, W.D. and Green, A.B., Eds., New York: Nova Science, 2013.Google Scholar
  21. 21.
    Varela, R., Álvarez, I., Santos, F., and Gómez-Gesteira, M., Has upwelling strengthened along worldwide coasts over 1982–2010?, Sci. Rep., 2015, no. 5, id 10016.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Institute of Natural and Technical SystemsSevastopolRussia

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