North Pacific Gyre Oscillation modulates seasonal timing and ecosystem functioning in the California Current upwelling system

Fanny Chenillat 1, * Pascal Rivière 1 Xavier Capet 2 Emanuele Di Lorenzo 3 Bruno Blanke 2
* Auteur correspondant
1 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)
2 LPO - Laboratoire de physique des océans
3 School of Earth and Atmospheric Sciences [Atlanta]
Abstract : On interannual and longer time scales, dynamical and biogeochemical fluctuations in the North Pacific are dominated by two modes of variability, namely the Pacific Decadal Oscillation and the North Pacific Gyre Oscillation (NPGO). In this study the regional expression of the NPGO in the California Current System (CCS) is detailed. The statistical relationship between the NPGO index and nearshore wind variability (mostly upwelling favorable) along the U.S. West coast is strongest in the wintertime (December to March) off Central California. Most importantly, NPGO fluctuations are associated with a seasonal shift of 1-2 months in the onset of the upwelling season. Regional numerical simulations show that an early (late) onset of upwelling during the positive (negative) phase of the NPGO leads to a more (less) productive planktonic ecosystem throughout spring and summer, i.e., several months after the direct NPGO effects on the system have ceased. These results bring new light on the California ecosystem variability as observed in atypical years such as 2005 and 2007.
Keywords : California upwelling system ecosystem numerical modeling seasonal variability
Type de document :
Article dans une revue
Geophysical Research Letters, American Geophysical Union, 2012, 39, pp.L01606,. 〈10.1029/2011GL049966〉
Liste complète des métadonnées

Littérature citée [25 références]  Voir  Masquer  Télécharger
http://hal.univ-brest.fr/hal-00672526
Contributeur : Adminhal Univbrestbu <>
Soumis le : mardi 21 février 2012 - 14:11:49
Dernière modification le : jeudi 11 janvier 2018 - 06:22:24
Document(s) archivé(s) le : mardi 22 mai 2012 - 02:45:19

Fichier

GRL-Chenillat-2012.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

IRD | IUEM | UNIV-BREST | LEMAR | THESES_IUEM | LOPS | CMM

Citation

Fanny Chenillat, Pascal Rivière, Xavier Capet, Emanuele Di Lorenzo, Bruno Blanke. North Pacific Gyre Oscillation modulates seasonal timing and ecosystem functioning in the California Current upwelling system. Geophysical Research Letters, American Geophysical Union, 2012, 39, pp.L01606,. 〈10.1029/2011GL049966〉. 〈hal-00672526〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

923

Téléchargements de fichiers

1174

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD