The impact of advection on stratification and chlorophyll variability in the equatorial Pacific

Journal Article (Journal Article)

Previously reported global-scale correlations between interannual variability in upper ocean stratification and chlorophyll a (a proxy for phytoplankton biomass) have been shown to be driven by strong associations between the two properties in the central and western equatorial Pacific. Herein, we present evidence that these correlations are not causal but instead result from the advection of heat, salt, and nutrients in the region. Specifically, we demonstrate that stratification and chlorophyll are simultaneously influenced by shifts in the horizontal advective inputs of cold/saline/nutrient-rich waters from upwelling regions to the east and warm/fresh/nutrient-poor waters to the west. We find that horizontal advection contributes substantially to the annual surface layer nutrient budget and, together with vertical advection, significantly impacts interannual variability in chlorophyll. These results highlight the importance of a three-dimensional framework for examining nutrient supply in the upper ocean - a crucial requirement for assessing future marine ecosystem responses to a changing climate.

Full Text

Duke Authors

Cited Authors

  • Dave, AC; Lozier, MS

Published Date

  • June 16, 2015

Published In

Volume / Issue

  • 42 / 11

Start / End Page

  • 4523 - 4531

Electronic International Standard Serial Number (EISSN)

  • 1944-8007

International Standard Serial Number (ISSN)

  • 0094-8276

Digital Object Identifier (DOI)

  • 10.1002/2015GL063290

Citation Source

  • Scopus