FN Archimer Export Format PT J TI The mixed-layer depth in the Ocean Model Intercomparison Project (OMIP): impact of resolving mesoscale eddies BT AF TREGUIER, Anne-Marie de Boyer Montégut, Clement Bozec, Alexandra Chassignet, Eric P. Fox-Kemper, Baylor Hogg, Andy McC. Iovino, Doroteacino Kiss, Andrew E. Le Sommer, Julien Li, Yiwen Lin, Pengfei Lique, Camille Liu, Hailong Serazin, Guillaume Sidorenko, Dmitry Wang, Qiang Xu, Xiaobio Yeager, Steve AS 1:10;2:1;3:2;4:2;5:3;6:4;7:5;8:4;9:6;10:7;11:;12:1;13:7;14:10;15:8;16:8;17:2;18:9; FF 1:;2:PDG-ODE-LOPS-SIAM;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:PDG-ODE-LOPS-OH;13:;14:;15:;16:;17:;18:; C1 Univ Brest, CNRS, Ifremer, IRD, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Brest 29280, France Center for Ocean–Atmospheric Prediction Studies, Florida State University, Tallahassee, USA Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, USA Research School of Earth Sciences and ARC Centre of Excellence for Climate Extremes, Australian National University, Canberra, Australia Ocean Modeling and Data Assimilation Division, Fondazione Centro Euro-Mediterraneo sui Cambiamenti Climatici (CMCC), Bologna, Italy Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, INRAE, IGE, Grenoble, France State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), Bremerhaven, Germany National Center for Atmospheric Research, Boulder, CO, USA Univ Brest, CNRS, Ifremer, IRD, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Brest 29280, France C2 IFREMER, FRANCE UNIV FLORIDA STATE, USA UNIV BROWN, USA UNIV AUSTRALIAN NATL, AUSTRALIA CCMC, ITALY UNIV GRENOBLE ALPES, FRANCE CHINESE ACAD SCI, CHINA INST A WEGENER, GERMANY NCAR, USA CNRS, FRANCE SI BREST SE PDG-ODE-LOPS-SIAM PDG-ODE-LOPS-OH UM LOPS IN WOS Ifremer UMR WOS Cotutelle UMR DOAJ copubli-france copubli-europe copubli-univ-france copubli-int-hors-europe copubli-sud IF 5.1 TC 3 UR https://archimer.ifremer.fr/doc/00824/93572/100314.pdf https://archimer.ifremer.fr/doc/00824/93572/105010.pdf LA English DT Article AB The ocean mixed layer is the interface between the ocean interior and the atmosphere or sea ice, and plays a key role in climate variability. It is thus critical that numerical models used in climate studies are capable of a good representation of the mixed layer, especially its depth. Here we evaluate the mixed layer depth (MLD) in six pairs of non-eddying (1° resolution) and eddy-rich (up to 1/16°) models from the Ocean Model Intercomparison Project (OMIP), forced by a common atmospheric state. For model validation, we use an updated MLD dataset computed from observations using the OMIP protocol (a constant density threshold). In winter, low resolution models exhibit large biases in the deep water formation regions. These biases are reduced in eddy-rich models but not uniformly across models and regions. The improvement is most noticeable in the mode water formation regions of the northern hemisphere. Results in the Southern Ocean are more contrasted, with biases of either sign remaining at high resolution. In eddy-rich models, mesoscale eddies control the spatial variability of MLD in winter. Contrary to a hypothesis that the deepening of the mixed layer in anticyclones would make the MLD larger globally, eddy-rich models tend to have a shallower mixed layer at most latitudes than coarser models do. In addition, our study highlights the sensitivity of the MLD computation to the choice of a reference level and the spatio-temporal sampling, which motivates new recommendations for MLD computation in future model intercomparison projects. PY 2023 PD JUN SO Geoscientific Model Development SN 1991-959X PU Copernicus GmbH VL 16 IS 13 UT 001054197300001 BP 3849 EP 3872 DI 10.5194/gmd-16-3849-2023 ID 93572 ER EF