Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4504
AuthorsVichi, M.* 
Masina, S.* 
Nencioli, F.* 
TitleA process-oriented model study of equatorial Pacific phytoplankton: the role of iron supply and tropical instability waves
Issue Date2008
Series/Report no.2/78(2008)
DOI10.1016/j.pocean.2008.04.003
URIhttp://hdl.handle.net/2122/4504
Keywordsbiogeochemical model
Tropical instability waves
PELAGOS
BFM
equatorial pacific
iron
Subject Classification03. Hydrosphere::03.01. General::03.01.02. Equatorial and regional oceanography 
03. Hydrosphere::03.01. General::03.01.07. Physical and biogeochemical interactions 
03. Hydrosphere::03.04. Chemical and biological::03.04.01. Biogeochemical cycles 
03. Hydrosphere::03.04. Chemical and biological::03.04.04. Ecosystems 
AbstractThe response of phytoplankton growth to iron supply and its modulation by large-scale circulation and tropical instability waves (TIWs) in the eastern equatorial Pacific has been investigated with an ocean biogeochemical model. This process study shows that iron can be efficiently advected from the New Guinea shelf through the Equatorial Undercurrent (EUC) to the eastern Pacific. The presence of a continental iron source is necessary for the maintenance of the observed subsurface iron maximum in the EUC core. In the eastern Pacific region, phytoplankton production is enhanced when additional iron is available in the EUC. Simulated phytoplankton variability is linked to TIWs activity, as revealed by a wavelet analysis of the total autotrophic carbon. The net local effect of the waves on phytoplankton can be either positive or negative depending on several factors. When the iron nutricline is sufficiently shallow to be reached by the wave vertical scale, the effect of the waves is to enhance iron availability in the euphotic zone leading to a net local increase of phytoplankton biomass. We therefore suggest that the local maxima of phytoplankton observed in moorings off the Equator in the eastern Pacific might be not only the result of concentration mechanisms, but also the result of an increase in local production sustained by advected iron.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
vichi_etal_iron_tiws.pdfRevised article prior to publication1.24 MBAdobe PDFView/Open
vichi_PO_2008.pdfarticle2.19 MBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

251
checked on May 26, 2017

Download(s)

363
checked on May 26, 2017

Google ScholarTM

Check

Altmetric