Modeling the impact of iron and phosphorus limitations on nitrogen fixation in the Atlantic Ocean - Archive ouverte HAL Access content directly
Journal Articles Biogeosciences Discussions Year : 2006

Modeling the impact of iron and phosphorus limitations on nitrogen fixation in the Atlantic Ocean

Abstract

The overarching goal of this study is to simulate subsurface N* (sensu, Gruber and Sarmiento, 1997) anomaly patterns in the North Atlantic Ocean and determine the basin wide rates of N2 fixation that are required to do so. We present results from an Atlantic implementation of a coupled physical-biogeochemical model that includes an explicit, dynamic representation of N2 fixation with light, nitrogen, phosphorus and iron limitations, and variable stoichiometric ratios. The model is able to reproduce nitrogen, phosphorus and iron concentration variability to first order. The latter is achieved by incorporating iron deposition directly into the model's detritus compartment which allows the model to reproduce sharp near surface gradients in dissolved iron concentration off the west coast of Africa and deep dissolved iron concentrations that have been observed in recent observational studies. The model can reproduce the large scale N* anomaly patterns but requires relatively high rates of surface nitrogen fixation to do so (1.8×1012 moles N yr?1 from 10° N?30° N, 3.4×1012 moles N yr
Fichier principal
Vignette du fichier
bgd-3-1391-2006.pdf (6 Mo) Télécharger le fichier
Origin : Explicit agreement for this submission
Loading...

Dates and versions

hal-00297846 , version 1 (18-06-2008)

Identifiers

  • HAL Id : hal-00297846 , version 1

Cite

V. J. Coles, R. R. Hood. Modeling the impact of iron and phosphorus limitations on nitrogen fixation in the Atlantic Ocean. Biogeosciences Discussions, 2006, 3 (5), pp.1391-1451. ⟨hal-00297846⟩

Collections

INSU EGU
83 View
87 Download

Share

Gmail Facebook X LinkedIn More