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Improvements of the HYCOM-CICE coupled model during the CORE-II project

Alexandra Bozec, Eric P. Chassignet
COAPS/FSU
(Abstract received 04/27/2015 for session X)
ABSTRACT

The second phase of the Coordinated Ocean-Ice Reference Experiments (CORE-II) project has provided a framework to compare the behavior of different coupled Ocean-Ice models forced with the same interannual atmospheric fields. Despite reasonable results during the first phase of the project using a climatological forcing instead of an interannual one, HYCOM, introduced in the CCSM3 as an alternate ocean component to POP, has shown a near-collapse of the Atlantic Meridional Overturning Circulation (~3-4 Sv) in the second phase [Danabasoglu et al., 2014]. Moreover, using an old version of the HYCOM code, this CCSM-HYCOM configuration was advecting density and salinity instead of temperature and salinity leading to a non-conservation of heat. In this study, we present the different changes implemented in a global coupled configuration of HYCOM-CICE in order to improve the simulation under interannual CORE-II forcing. Those changes consist of: 1) the addition of the Large and Yeager [2004] bulk formulation, 2) a modification of the method used to couple HYCOM and CICE, 3) a modification of the calculation of the thermobaric corrections to the pressure gradient force and 4) the use of a spatially varying SSS relaxation. The impacts of these changes as well as the results of the new CORE-II simulation are discussed.

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2015 LOM Workshop, Copenhagen, Denmark June 2nd - 4th, 2015