1 / 15

ARCTIC SYNTHESIS Ecosystem Modeling Status Yvette H. Spitz and L é o Berline OSU-COAS

ARCTIC SYNTHESIS Ecosystem Modeling Status Yvette H. Spitz and L é o Berline OSU-COAS. Chlorophyll a. SeaWifs climatology. Model 1986. White line : ice edge. 11-component model. Observations. Coded new ecosystem model 2 phytoplankton (pico and diatom) and 2 zooplankton

cachez
Download Presentation

ARCTIC SYNTHESIS Ecosystem Modeling Status Yvette H. Spitz and L é o Berline OSU-COAS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ARCTIC SYNTHESISEcosystem Modeling StatusYvette H. Spitz and Léo BerlineOSU-COAS

  2. Chlorophyll a SeaWifs climatology Model 1986 White line : ice edge

  3. 11-component model Observations

  4. Coded new ecosystem model • 2 phytoplankton (pico and diatom) and 2 zooplankton • Full microbial loop • Nitrate, Ammonium and Silicate • Diagnostic preliminary runs 3D

  5. Nitrate concentration after one year of run

  6. Problem vertical diffusion • High surface nitrate concentration in the north Chukchi Sea Depth (m) Time (month)

  7. Deep mixing that leads to high nutrient in the surface and therefore artificially high bloom. Changed Eq of state in POP (Jacket and McDougall, 1995, instead of the traditional polynomial fit to the UNESCO eqn of state), which improved slightly the density field • Light penetration and mixing seems to pose problems for us - Ice model might need tuning • Open Boundary conditions at the Strait might help to retain some nutrient on the shelf

  8. Salinity UNESCO Eq of State New Eq of State

  9. Temperature New Eq of State UNESCO Eq of State

  10. Nitrate initial condition for winter • Levitus in GIN • Colony in Can Basin • Value from literature on shelves

  11. Location 1D model Tests • 3 different ice cover Greenland SHEBA Chukchi

  12. Greenland 1D outputs Blue : model, Red: obs (Cota) NO3 Chl

  13. Greenland 1D outputs Blue : model, Red: obs (Cota) T-Dependence of growth NO3 Chl

  14. Chukchi 1D outputs Blue : model, Red: obs (SBI) July, end of simulation

  15. Questions • Greenland • Is nitrate not depleted in summer? • Is it general for GIN? • Chukchi • Is benthic remineralization important? • Need to go further north to avoid contamination by Bering Strait • Modeled phytoplankton • Main taxa: Diatom, auto. Dinoflagellates ok? • Importance phaeocystis? • Chl/C Value valid arctic-wide?

More Related