The effect of advection on the nutrient reservoir in the North Atlantic subtropical gyre.

Published

Journal Article

Though critically important in sustaining the ocean's biological pump, the cycling of nutrients in the subtropical gyres is poorly understood. The supply of nutrients to the sunlit surface layer of the ocean has traditionally been attributed solely to vertical processes. However, horizontal advection may also be important in establishing the availability of nutrients. Here we show that the production and advection of North Atlantic Subtropical Mode Water introduces spatial and temporal variability in the subsurface nutrient reservoir beneath the North Atlantic subtropical gyre. As the mode water is formed, its nutrients are depleted by biological utilization. When the depleted water mass is exported to the gyre, it injects a wedge of low-nutrient water into the upper layers of the ocean. Contrary to intuition, cold winters that promote deep convective mixing and vigorous mode water formation may diminish downstream primary productivity by altering the subsurface delivery of nutrients.

Full Text

Duke Authors

Cited Authors

  • Palter, JB; Lozier, MS; Barber, RT

Published Date

  • September 2005

Published In

Volume / Issue

  • 437 / 7059

Start / End Page

  • 687 - 692

PubMed ID

  • 16193044

Pubmed Central ID

  • 16193044

Electronic International Standard Serial Number (EISSN)

  • 1476-4687

International Standard Serial Number (ISSN)

  • 0028-0836

Digital Object Identifier (DOI)

  • 10.1038/nature03969

Language

  • eng