Modeling the influence of local/external processes on nitrogen and phytoplankton dynamics in the GoM/GB region R. Ji With help from: PI team: Davis, Chen,

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Presentation transcript:

Modeling the influence of local/external processes on nitrogen and phytoplankton dynamics in the GoM/GB region R. Ji With help from: PI team: Davis, Chen, Beardsley, Townsend, Durbin, Runge, Flagg UMASS-D modeling group: Q. Xu, G. Cowles, R. Tian, S. Hu, D. Stuebe NMFS: D. Mountain, J. Hare, M. Taylor

Status  Completed continuous run for FVCOM+NPZD; comparing data/model results  Completed 1995 Pseudocalanus model run; using “stage with mean age” method; Testing different implementation of CPD  Examining effect of freshening on phytoplankton dynamics (data analysis + numerical exp.)  1 ms. submitted to JMS + 1 ms. to be submitted to GRL + 1 new baby

Model structure

Surface - Nitrogen

Surface - Phytoplankton

Transect - Phytoplankton

Model skills Degree of agreement: (Willmott, 1981)

Model vs data on GB N

P

N

P

Model vs data in Basins Jordan Basin Wilkinson Basin

Model vs data at CMO

Sensitivity to IC (GB crest) N P

Sensitivity to IC (Wilkinson Basin) N P

Sensitivity to BC (Scotian Shelf) N P

Sensitivity to BC (Wilkinson Basin) (GB crest)

Nitrogen cycle Redline from Pastsuzak et al., 1982

N demand and supply on GB Total N demand: ~1.26x10 3 mol N s -1 (Horne et al., 1989) New N supply: ~0.48x10 3 mol N s -1 (Townsend & Pettigrew, 1997) ~5x10 3 mol N s -1 (Horne et al., 1989)

Modeled N flux on GB Summertime new N supply 0.23x10 3 mol N s -1 Summertime f ratio = 0.18

Response to bottom N change

Bloom - freshening

Bloom “propagation”

Timing-SSS anomaly

Magnitude/NPP

Issues  Huge amount of model output, O(TB)  Very limited availability of data in GoM during GLOBEC year (N, Vertical profile)  Boundary conditions (N/P/Z/D, T/S)  Need free grad students