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

  2. Status • Completed 1995-1999 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

  3. Model structure

  4. Surface - Nitrogen

  5. Surface - Phytoplankton

  6. Transect - Phytoplankton

  7. Model skills Degree of agreement: (Willmott, 1981)

  8. Model vs data on GB N

  9. Model vs data on GB P

  10. Model vs data on GB N

  11. Model vs data on GB P

  12. Model vs data in Basins Wilkinson Basin Jordan Basin

  13. Model vs data at CMO

  14. Sensitivity to IC(GB crest) N P

  15. Sensitivity to IC(Wilkinson Basin) N P

  16. Sensitivity to BC(Scotian Shelf) N P

  17. Sensitivity to BC (Wilkinson Basin) (GB crest)

  18. Nitrogen cycle Redline from Pastsuzak et al., 1982

  19. N demand and supply on GB Total N demand: ~1.26x103 mol N s-1 (Horne et al., 1989) New N supply: ~0.48x103 mol N s-1 (Townsend & Pettigrew, 1997) ~5x103 mol N s-1 (Horne et al., 1989)

  20. Modeled N flux on GB Summertime new N supply 0.23x103 mol N s-1 Summertime f ratio = 0.18

  21. Response to bottom N change

  22. Bloom - freshening

  23. Bloom “propagation”

  24. Bloom “propagation”

  25. Timing-SSS anomaly

  26. Magnitude/NPP

  27. 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

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