Fall AGU Meeting (Dec. 2002) COAST abstracts:

• Allen
  
• Bane et al.
  
• Barth et al.
  
• Carney et al.
  
• Couch et al.
  
• Cowles et al.
  
• Dale et al.
  
• Durski et al.
  
• Egbert et al.
  
• Gan et al.
  
• Hales et al.
  
• Kosro et al.
  
• Kuebel et al.
  
• Kurapov et al.
  
• Perlin et al.
  
• Pierce et al.
  
• Ruttenberg et al.
  
• Samelson
  
• Spitz et al.
  
• Wheeler
  

Abstracts should be cited as:

EOS Trans. AGU, 83 (47),
Fall Meet. Suppl.,
Abstract XXXXX-XX, 2002

OS62A-0240

Three-dimensional response of the ecosystem to upwelling off the
Oregon Coast

Y H Spitz, J Gan, and J S Allen

Time-dependent, three-dimensional response of the ecosystem to
upwelling off the Oregon coast is studied using the Princeton
Ocean Model (POM) and a coupled five-component ecosystem model
(NNPZD) (Spitz et al., 2002). The spatial and temporal variability
of the ecosystem during the summer 2001 on the Oregon shelf
is investigated. High mean surface phytoplankton values are
found near the coast and extend over Heceta Bank, with a pattern
similar to the cold surface temperature. The standard deviations
of phytoplankton are the largest on Heceta Bank, where northward
currents associated with a cyclonic circulation are found near the
coast during relaxations. Vertical sections show that higher standard
deviations are found deeper on Heceta Bank (44.2 N) than at two
northern sections (44.7 N and 45 N). This corresponds also to higher
standard deviations of nitrate at depth. The maximum mean surface
zooplankton is located offshore of the maximum phytoplankton. The
low standard deviations of zooplankton found at the surface near
the maximum mean zooplankton values indicate that this pattern is
a quasi- permanent feature during the 2001 upwelling season. The
highest standard deviations of zooplankton are found near the coast
and near the 200 m isobath. A complete description of the relative
contribution of physical and biological forcing to the ecosystem
response will be presented.