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RAS PresidiumИсследование Земли из космоса Earth Research from Space

  • ISSN (Print) 0205-9614
  • ISSN (Online) 3034-5405

Low-Frequency Wind Field Variability in the Chilean Upwelling Region

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PII
10.31857/S0205961424060085-1
DOI
10.31857/S0205961424060085
Publication type
Article
Status
Published
Authors
Alexander Polonsky
  • Affiliation: Institute of Natural and Technical Systems
Volume/ Edition
Volume / Issue number 6
Pages
96-106
Abstract
This paper analyzes the impact of changes in surface wind (SW) speed and direction in the northern and southern parts of the Chilean upwelling (CA) on the interannual and interdecadal variability of the Ekman upwelling index. Satellite data were used for the period 1988 – 2022’s. It is shown that the increase in wind speed in the northern part of the CA region during 1997–2004 was mainly accompanied by the change in the direction of SW in the coastal zone which favors the upwelling intensification. For other periods (with the exception of certain years) this pattern was not case. In general, wind speed changes in the northern part of the CA region impact a little bit more effectively the changes in the upwelling index than changes in the SW direction. In the southern CA part, the change in the Ekman upwelling index is mostly determined by the change in the SW speed. Long-term variability of wind speed in the upwelling zone is realized in the form of a multidecadal oscillation, the period of which is estimated at 65-70 years which coincides with the typical period of the Atlantic multidecadal oscillation.
Keywords
экмановский индекс апвеллинга центр масс скорость и направление приповерхностного ветра субтропический максимум давления межгодовая и междекадная изменчивость
Date of publication
15.09.2025
Year of publication
2025
Number of purchasers
0
Views
6

References

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