Impacts of Climate and basin-scale variability on the seeding and production of Calanus finmarchicus in the Gulf of Maine and Georges Bank


	Avijit Gangopadhyay
	With Bisagni, Gifford and Batcheldar
	(Ayan Chaudhuri and Carolina Nobre)

	WHOI meeting on June 23, 2008

GLOBEC P4B Results (Gangopadhyay, Bisagni, Batchelder and Gifford)


	The basin-scale North Atlantic model is spun-up using Levitus climatology and forced with adjusted NCEP High and Low NAO fields – 2 validations
	The Gulf Stream position is northward (southward) during High (Low) NAO years
	LSW advection in the GOMGB region during 1997-98 after 1996 Low-NAO

Basin-scale model -- ROMS

Validation Criterion


	The Gulf Stream position is northward (southward) during High (Low) NAO years.
	The model is spun-up using Levitus climatology for the North Atlantic Basin and subsequently forced with adjusted NCEP High and Low NAO fields.
	GS mean positions are computed at different depths for both High and Low NAO simulations for comparison

Slide 5

Slide 6

Slide 7

Proposed Biological simulations


	Individual-based models (HPB)
	Lagrangian pathways
	Zooplankton data as initial and validation fields (DG)
	Seeding vs. production hypothesis testing
	Impact of Labrador water inflow on Slope sea and GOMGB regions

Basin-Scale Physical Fields


	Are available from
	www.smast.umassd.edu/modeling/ROMS.htm
	Questions and Concerns: avijit@umassd.edu

3-D fields for GOM 1995-98


	5-day SST
	FORMS non-dimensional fields from Gangopadhyay et al., 2003 study
	Supplemental Levitus non-dimensional profiles for additional slope and shelf water
	Background ROMS runs for 1995-1998
	Multiscale Objective Analysis
	Coupled Slope Water State analysis