DMCA
Interactions of the iron and phosphorus cycles: A three-dimensional model study (2005)
| Venue: | GLOBAL BIOGEOCHEM CYCLES |
| Citations: | 38 - 8 self |
BibTeX
@ARTICLE{Dutkiewicz05interactionsof,
author = {S. Dutkiewicz and M. J. Follows and P. Parekh},
title = { Interactions of the iron and phosphorus cycles: A three-dimensional model study},
journal = {GLOBAL BIOGEOCHEM CYCLES},
year = {2005},
pages = {10--1029}
}
Share
 |
 |
 |
 |
||
OpenURL
Abstract
We use an ocean circulation, biogeochemistry, and ecosystem model to explore the interactions between ocean circulation, macro- and micro-nutrient supply to the euphotic layer, and biological productivity. The model suggests a tight coupling between the degree of iron limitation in the upwelling subpolar and tropical oceans and the productivity of the adjacent subtropical gyres. This coupling is facilitated by lateral Ekman transfer of macro-nutrients in the surface ocean. We describe a coarse resolution configuration of the MIT ocean circulation and biogeochemistry model in which there are fully prognostic representations of the oceanic cycles of phosphorus, iron, and silicon. The pelagic ecosystem is represented using two functional groups of phytoplankton and a single grazer. Using present-day forcing, the model qualitatively captures the observed basin and gyre scale patterns of nutrient distributions and productivity. In a suite of sensitivity studies we find significant regional variations in response to changes in the aeolian iron supply. In a dustier (model) world, the Southern Ocean and Indo-Pacific upwelling regions are more productive, but there is a decrease in productivity in the subtropical gyres and throughout the Atlantic basin. These results can be described most
Keyphrases
global biogeochem phosphorus cycle three-dimensional model study ocean circulation significant regional variation surface ocean biogeochemistry model southern ocean observed basin pelagic ecosystem indo-pacific upwelling region subtropical gyre biological productivity coarse resolution configuration sensitivity study adjacent subtropical gyre single grazer lateral ekman transfer mit ocean circulation atlantic basin oceanic cycle micro-nutrient supply present-day forcing nutrient distribution iron limitation functional group euphotic layer upwelling subpolar tropical ocean ecosystem model scale pattern prognostic representation tight coupling aeolian iron supply
