Physical controls on the seasonal migration of the North Pacific transition zone chlorophyll front

Published

Journal Article

The large seasonal migration of the transition zone chlorophyll front (TZCF) is of interest because a number of marine fauna, both commercial and endangered, appear to track it. Herein we examine the physical dynamics driving this seasonal migration of the TZCF. Vertical processes, traditionally viewed as controlling the dynamical supply of nutrients to surface waters, prove insufficient to explain seasonal variations in nutrient supply to the transition zone. Instead, we find that the horizontal Ekman transport of nutrients from higher latitudes drives the TZCF's southward migration. The estimated horizontal transport of nitrate supports up to 40% of new primary productivity in the region annually and nearly all of new primary productivity in the winter. The significance of horizontal advection to the North Pacific transition zone supports revising the paradigm that nutrients are supplied to surface waters from below. © 2010 by the American Geophysical Union.

Full Text

Duke Authors

Cited Authors

  • Ayers, JM; Lozier, MS

Published Date

  • January 1, 2010

Published In

Volume / Issue

  • 115 / 5

Electronic International Standard Serial Number (EISSN)

  • 2169-9291

Digital Object Identifier (DOI)

  • 10.1029/2009JC005596

Citation Source

  • Scopus