Pacific ventilation of the Arctic Ocean's lower halocline by upwelling and diapycnal mixing over the continental margin
Article first published online: 29 SEP 2005
Copyright 2005 by the American Geophysical Union.
Geophysical Research Letters
Volume 32, Issue 18, 28 September 2005
How to Cite
2005), Pacific ventilation of the Arctic Ocean's lower halocline by upwelling and diapycnal mixing over the continental margin, Geophys. Res. Lett., 32, L18609, doi:10.1029/2005GL023999., , , , and (
- Issue published online: 29 SEP 2005
- Article first published online: 29 SEP 2005
- Manuscript Accepted: 31 AUG 2005
- Manuscript Revised: 23 AUG 2005
- Manuscript Received: 6 JUL 2005
 Pacific winter waters, a major source of nutrients and buoyancy to the Arctic Ocean, are thought to ventilate the Arctic's lower halocline either by injection (isopycnal or penetrative) of cold saline shelf waters, or by cooling and freshening Atlantic waters upwelled onto the shelf. Although ventilation at salinity (S) > 34 psu has previously been attributed to hypersaline polynya waters, temperature, salinity, nutrient and tracer data suggest instead that much of the western Arctic's lower halocline is in fact influenced by a diapycnal mixing of Pacific winter waters (with S ∼ 33.1 psu) and denser eastern Arctic halocline (Atlantic) waters, the mixing taking place possibly over the northern Chukchi shelf/slope. Estimates from observational data confirm that sufficient quantities of Atlantic water may be upwelled to mix with the inflowing Pacific waters, with volumes implying the halocline over the Chukchi Borderland region may be renewed on timescales of order a year.