1. UW: Jinlun Zhang, Mike Steele
AOMIP workshop 2009
The Impact of Changes in Arctic Sea Ice on the Marine Planktonic Ecosystem
UW: Jinlun Zhang, Mike Steele
OSU: Yvette Spitz
WHOI: Carin Ashjian
URI: Robert Campbell

2. Scientific Objectives
Synthesize the historical evolution of the arctic biology, sea ice, and ocean system in the past decades to understand the large-scale changes that have occurred in the sea ice, upper ocean, and, to the extent possible, the marine planktonic ecosystem over this period.
Identify key linkages and interactions between the sea ice, the upper ocean, and the planktonic ecosystem to understand how changes in sea ice affect biogeochemical processes and food-web dynamics in Arctic shelf and basin upper ocean ecosystems and the export of OM from the upper ocean.

3. The pan-Arctic Biology/Ice/Ocean Modeling
and Assimilation System (BIOMAS)
BIOMAS Grid Configuration

4. BIOMAS Model Components
Parallel Ocean and Ice Model (POIM, Zhang/Rothrock 2003)
POP (parallel ocean program) ocean model (Smith et al. 1992)
Dynamic thermodynamic sea ice model (Hibler 1980;
Zhang/Hibler 1997); teardrop ice rheology (Zhang/Rothrock 2005)
Two marine planktonic ecosystem models based on Spitz et al. (2001) & Kishi et al., (2007)

5. Modified Kishi
Spitz
…no ice biology yet

6. Preliminary results from BIOMAS with the modified Kishi et al
Preliminary results from BIOMAS with the modified Kishi et al. ecosystem model (no assimilation)

7. Modeled August ice thickness and PAR
PAR  0.43 Fsw (z=0)
White line: observed ice edge
Ice retreat:
more PAR
Thinner ice:
more under-ice PAR

8. Chlorophyll a ( mean)
SeaWiFS (Pabi et al., 2008)
BIOMAS

9. Modeled ice concentration and PP
Comparison with observed PP in process.
(V. Hill, P. Matrai)

10. Modeled and observed annual PP integrated over the upper 100 m north of 66N

11. Modeled daily evolution of PP, Chl a, picophytoplankton (PS), and mesozooplankton (ZL) in comparison with SBI data ( )
range ok
timing ok sometimes…

12. Modeled vertical distribution of Chl a and PP in comparison with SBI data
uhhh…
Low surface & deep values
Sub-surface max

13. Thank you! http://psc.apl.washington.edu/zhang/BIOMAS/index.html
Paper in preparation…