Sea surface height variability in ORCA025 forced with COREv2 and JRA-55-do

Wagner, Patrick, Böning, Claus W. and Scheinert, Markus (2018) Sea surface height variability in ORCA025 forced with COREv2 and JRA-55-do [Talk] In: DRAKKAR 2018 Annual Workshop, 22.-24.01.2018, Grenoble, France.

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Sea surface height (SSH) variability in the tropical Pacific is determined by surface fluxes of which momentum flux is the most important one. The new atmospheric forcing data set JRA-55-do (Tsujino, H. et al. (submitted)) offers the chance of an improved representation of tropical SSH variability. We present a comparison of SSH variability of the tropical Pacific in two global ORCA025 (Nemo3.6) configurations, forced with COREv2 and JRA-55-do atmospheric datasets. While the amplitude of SSH variability in COREv2-runs is in close agreement with altimeter observations, a reduced interannual variability of wind stress in JRA-55-do leads to weaker SSH-variability in the tropical Pacific.
A lagged correlation analyses of SSH with climate indices such as ENSO or Southern Oscillation shows a higher agreement between JRA-55-do and altimeter observations than between COREv2 and observations, suggesting an improved representation of the processes that determine SSH variability

Document Type: Conference or Workshop Item (Talk)
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
Date Deposited: 22 Nov 2018 11:54
Last Modified: 22 Nov 2018 11:54

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