A layer in an ocean or other body of water in which water density increases rapidly with depth.
- Deployments of the HRS and measurements of microscale turbulence were made simultaneously in the mixed surface layer, the pycnocline, and the DCM.
- Saline and warm Mediterranean water flowing through the Bosporus Strait maintains a permanent pycnocline.
- The polar regions are the only places where deep waters are ever exposed to the atmosphere because the pycnocline is not always present.
1950s: from Greek puknos 'thick' + cline.
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