1. Large-scale Modeling of Primary Production and Related Dimethylsulfide (DMS) Production in the Sea Ice Environment
Clara Deal and Meibing Jin, International Arctic Research Center (IARC), University of Alaska Fairbanks, Fairbanks, Alaska, USA
Scott Elliott, Elizabeth Hunke, Mathew Maltrud, and Nicole Jeffery, Los Alamos National Laboratory, Los Alamos, New Mexico, USA
Simulated Annual Primary Production within Sea Ice (g C m-2)
Sea Ice DMS Model Equations:
Background
EPSCoR-State/National Laboratory Partnership Grant
running global thermodynamic/dynamic sea ice model, CICE, with ice-DMS ecosystem; and coupled CICE-POP with ice-ocean DMS ecosystem
assessed large-scale spatial and seasonal variability of primary production and ice algal biomass, now to focus on DMS and its precursor, DMSP
Preliminary Ice and Ocean DMS(P) Model Results
Latitude-averaged ice algal biomass
(mg Chl m-2)
Findings
***
Broader impacts
modeling of sea ice biogeochemical cycles, e.g. Hg, bio-particles
inclusion or microbial loop and trace gas exchange, e.g. CO2
ice algal release shapes structure and function of polar marine food web
ice-ice algae-albedo feedback?
ocean and ice DMS emissions to the atmosphere
growth of aerosols that play a role in cloud formation and properties
Interesting DMS(P) Observations
S compounds accumulate in bottom sea ice where ice algal biomass is highest (Levaseur et al. 1997; Uzuka 2003)
ice edge strongest, most consistent predictor of high seawater DMSP (Matrai et al. 2007)
DMSP enriched in lead microlayers (Matrai et al. 2008)
Current focus
model sensitivity studies of DMS model parameters
analyzing and evaluating model results for
improving vertical resolution in ice and water column
further refinement of ice and ocean DMS modules for improved…..Arctic where…