TY - GEN
AU - Y.M. Tang
AU - Magdalena Alonso-Balmaseda
AU - Kristian Mogensen
AU - Sarah Keeley
AU - Peter Janssen
AB - Sea ice is an integral part of the global climate system, its initialisation through the assimilation of available data is crucial for obtaining reliable seasonal and monthly forecasts. This paper reports three contrasting sea ice numerical experiments. These are a forced reference simulation, without any sea ice data assimilation, and two simulations where the sea ice concentration from observations is used to constrain the numerical model via different nudging schemes. One nudging scheme has a spatially uniform relaxation time scale, while the other has a spatially and time varying relaxation time scale. While both nudging schemes efficiently constrain the sea ice extent, the ice thickness remains largely unconstrained, the two nudging experiments giving different solutions. Comparison of the sea ice thickness with satellite observations suggests that the simulation with the spatially varying nudging scheme produces more realistic patterns than the simulation with a uniform nudging scheme; with a marginal improvement over the reference simulation.
BT - ECMWF Technical Memoranda
DA - 09/2013
DO - 10.21957/7tpksiq16
LA - eng
M1 - 707
N2 - Sea ice is an integral part of the global climate system, its initialisation through the assimilation of available data is crucial for obtaining reliable seasonal and monthly forecasts. This paper reports three contrasting sea ice numerical experiments. These are a forced reference simulation, without any sea ice data assimilation, and two simulations where the sea ice concentration from observations is used to constrain the numerical model via different nudging schemes. One nudging scheme has a spatially uniform relaxation time scale, while the other has a spatially and time varying relaxation time scale. While both nudging schemes efficiently constrain the sea ice extent, the ice thickness remains largely unconstrained, the two nudging experiments giving different solutions. Comparison of the sea ice thickness with satellite observations suggests that the simulation with the spatially varying nudging scheme produces more realistic patterns than the simulation with a uniform nudging scheme; with a marginal improvement over the reference simulation.
PB - ECMWF
PY - 2013
EP - 27
T2 - ECMWF Technical Memoranda
TI - Sensitivity of sea ice thickness to observational constraints on sea ice concentration
UR - https://www.ecmwf.int/node/12566
ER -