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Understrøm

En understrøm er en havstrøm som går under havoverflaten og som har større hastighet i dypere vannlag, ofte nær bunnen. Et eksempel er den norske kyststrømmen. Gjennom sund går det ofte understrømmer i motsatt retning av overflatestrømmen, som i den baltiske strømmen eller gjennom Bosporussundet. Andre eksempler er det ekvatoriale strømsystemet med understrømmer som Cromwellstrømmen i Stillehavet, samt strømmer i Atlanterhavet, Indiahavet, understrømmen i California,[1] Agulhas-understrømmen,[2] den dype termohaline sirkulasjonen i Atlanterhavet, og de dype tygdekraft-strømmene nær Antarktis. De underliggende mekanismene varierer for de ulike typene av understrømmer.

Forveksling

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Av og til blir utgående strømmer feilaktig kalt understrømmer, men dette er feil oversettelse.

Referanser

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  1. ^ Pierce, S. D. et al (2000). "[Pierce, S.D.; Smith, R.L.; Kosro, P.M.; Barth, J.A.; Wilson, C.D. (mai 2000). «Continuity of the poleward undercurrent along the eastern boundary of the mid-latitude north Pacific». Deep-Sea Research Part II: Topical Studies in Oceanography. 47 (5–6): 811–829. Bibcode:2000DSRII..47..811P. doi:10.1016/S0967-0645(99)00128-9. 
  2. ^ Beal, Lisa M. (2009). «A time-series of Agulhas Undercurrent transport». J. Phys. Oceanogr. 39 (10): 2436–50. Bibcode:2009JPO....39.2436B. doi:10.1175/2009JPO4195.1. 
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Understrøm
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