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Where to locate ‘Fresh-Spurs’ Modeled mixed layer salt budget (seasonal) as a function of location

Where to locate ‘Fresh-Spurs’ Modeled mixed layer salt budget (seasonal) as a function of location. Jim Carton (UMD), Semyon Grodsky (UMD), Frank Bryan (NCAR).

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Where to locate ‘Fresh-Spurs’ Modeled mixed layer salt budget (seasonal) as a function of location

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  1. Where to locate ‘Fresh-Spurs’Modeled mixed layer salt budget (seasonal) as a function of location Jim Carton (UMD), SemyonGrodsky (UMD), Frank Bryan (NCAR) Model: 0.1o x 0.1ox10m global POP2 GCM forced by repeating Normal Year Forcing for many years (Bryan/Bailey). We use a 5-year sample

  2. Time mean SSF and SSS Surface Salt Flux (psu/yr) SSF Ekman SSS is not a simple rain gauge. SSS

  3. Possible Fresh-SPURS domains Time-mean SSS, MLD T P Colors: SSS Contours: MLD 1 2 3 4 6ox10o domains

  4. Rest of the talk presents:terms from the salt budget averaged over the mixed layer H(t) calculated every time-step small Horizontal salt advection (including eddies) VDIF: vertical turbulent flux of salt across the bottom of the mixed layer All terms are smoothed by retaining only annual and semi-annual harmonics

  5. SALT BUDGET (REGION 1) salinifying freshening TEND HADV

  6. SALT BUDGET (REGION 1) MLD SSS Salinifying: TEND=SSF+HADV freshening TEND=SSF+VDIFF Overall TEND=SSF+HADV+VDIFF Go in this season for a local balance

  7. SALT BUDGET (REGION 2) salinifying freshening

  8. SALT BUDGET (REGION 2) salinifying: TEND=SSF+HADV Freshening: TEND=SSF+VDIFF Overall TEND=SSF+HADV+VDIF Go in this season for a local balance

  9. SALT BUDGET (REGION 3) salinifying salinifying freshening

  10. SALT BUDGET (REGION 3) Overall local balance! TEND≈SSF+VDIFF

  11. SALT BUDGET (REGION 4) COMPLICATED

  12. SALT BUDGET (REGION 4) COMPLICATED Overall: complex balance in Panama Bight TEND=SSF+HADV+VDIFF+VADV

  13. REGION 3 SALT BUDGET SUMMARY Overall local balance! TEND=SSF+VDIF {HADV+VADV compensate in August} SSS MLD

  14. Spatial structure in August 3

  15. Advection in August

  16. Summary • Regions 1&2: • salinification: TEND~ SSF+HADV (non-local); • freshening: TEND~SSF+VDIF (local) • Region 3: total advection is weak and the balance is local: TEND~SSF+VDIF throughout the year • HADV cancels VADV in August • some missing Tehuantepec effects in DJF due to forcing • Region 4: All terms contribute in Panama Bight Interannual variability: Grad student, Ben Johnson, is producing a new simulation driven by interannually varying CORE forcing (1979-2010+). Should be ready by June.

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