Collaborative Research:  Changing Seasonality of the Arctic: Alteration of Production Cycles and Trophic Linkages in Response to Changes in Sea Ice and Upper Ocean Physics
Funded by NSF Office of Polar Programs
Jinlun Zhang and Mike Steele (University of Washington)
Yvette H. Spitz (Oregon State University)
Carin J. Ashjian (Woods Hole Oceanographic Institution)
Robert G. Campbell (University of Rhode Island)



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Description of The pan-Arctic Biology/Ice/Ocean Modeling and Assimilation System (BIOMAS)

BIOMAS consists of a Parallel Ocean and sea Ice Model (POIM, Zhang and Rothrock 2003) with data assimilation capabilities and a biological model. The POIM is formulated in a generalized orthogonal curvilinear coordinate (GOCC) system and designed to run on computers with a single processor or massively parallel processors. The POIM couples the Parallel Ocean Program (POP), developed at the Los Alamos National Laboratory, with a dynamic thermodynamic sea ice model (Zhang and Hibler 1997; Zhang and Rothrock 2003), developed at the Polar Science Center, University of Washington. Observations of sea ice concentration and sea surface temperature are to be assimilated in BIOMAS. The biological model will use both an ice and a water component. It will include two phytoplankton components, two mesozooplankton components, a microbial loop, ice algae, nutrients, two size classes of detritus, dissolved OM, and water column remineralization via the microbial loop.  The water column model is an extension of the Spitz et al., (2001) model that has been coupled to a 1-D physical model to study the time evolution of the ecosystem for the Chukchi Sea and was calibrated with the observations collected during two cruises in 1996. he 1D ice algal model consists of both the bottom or skeletal community and the sub-ice community. It includes the ability to model for species succession and incorporates an irradiance sub-model calibrated with observations from Arctic drift data in 2007.

The configuration of the finite-difference grid of BIOMAS is shown below.

Atlantic Pacific Grid


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