Matsumoto, K and Tokos, K. S and Price, A and Cox, S (2008) GENIE-M a new and improved GENIE-1 developed in Minnesota. Copernicus Publications.

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Abstract

Here we describe GENIE-M. a new and improved version of the Grid ENabled lntegrated Earth system madel (GENIE), which is a 3-D earth system madel of intermediate complexity. Main development goals of GENIE-M were to: (1) bring oceanic uptake of anthropogenic transient tracers within data constraints; (2) increase vertical resolution in the upper ocean to better represent near-surface biogeochemical processes; (3) calibrate the deep ocean ventilation with observed abundance of radiocarbon. We achieved ali these goals through a transparent process of calibration that mostly consisted of objective madel optimization. An important new feature in GENIE-M that dramatically improved the uptake of CFC-11 and anthropogenic carbon is the depth dependent vertical diffusivity in the ocean, which is spatially uniform in GENIE-1. ln GENIE-M. biological production occurs in the top two layers above the compensation depth of 1 00 m and is modified, for example, by diagnosed mixed layer depth. ln contrast, production in GENIE-1 occurs in a single layer with thickness of 175 m. These improvements make GENIE-M a well-calibrated madel of intermediate complexity suitable for investigations of the global marine carbon cycle requiring long integration time.

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