nextGEMS: Output of the WP6 ocean vertical mixing sensitivity runs


Bastin, Swantje et al.

In work package 6 of the nextGEMS project, several ocean-only model runs were performed with FESOM (Version 2.0) and ICON-O (Version 2.6.6), to test the sensitivity of the upper tropical Atlantic to different settings of the vertical mixing scheme. Two different mixing schemes were tested: TKE and KPP. For TKE, we tested different settings of the c_k parameter (0.1, 0.2 and 0.3), and for KPP different settings of the critical bulk Richardson number (0.3 and 0.27). These runs were done with both ICON-O and FESOM, to enable a comparison of the effects of the vertical mixing settings across different models. From ICON-O only, there are some additional TKE runs available, where we increased the interior ocean background mixing, and switched on the Langmuir turbulence parameterisation. There is also an ICON-O run which uses the FESOM default forcing bulk formulae, to check how much of the differences between the models originates from their different default bulk formulae.

All model runs are ocean only, forced with hourly ERA5 reanalysis data. The horizontal resolution is 10km (for FESOM, the extratropical regions have a coarser grid).

The output from the tropical Atlantic from these model runs is provided here, with a high temporal resolution of 3 hours, and interpolated to a 0.1°x0.1° latitude-longitude grid.
Please read the readme before using the data:

nextGEMS is funded through the European Union’s Horizon 2020 research and innovation program under the grant agreement number 101003470.
nextGEMS (Next Generation Earth Modelling Systems)
Dr. Swantje Bastin (
Spatial Coverage
Longitude -60 to 15 Latitude -10 to 30 Altitude: -200 m to 0 m
Temporal Coverage
2014-01-01 to 2015-12-31
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Creative Commons Attribution 4.0 International (CC BY 4.0) (
Data Catalog
World Data Center for Climate
34.26 TiB (37673259095738 Byte)
completely archived
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Bastin, Swantje; Koldunov, Aleksei; Haak, Helmuth; Koldunov, Nikolay; Danilov, Sergey; Jungclaus, Johann; Jochum, Markus; Mrozowska, Marta A.; Fischer, Tim; Dengler, Marcus; Brüggemann, Nils; Gutjahr, Oliver; Specht, Mia Sophie (2023). High frequency tropical Atlantic data from vertical mixing sensitivity runs with FESOM and ICON-O (nextGEMS WP6). World Data Center for Climate (WDCC) at DKRZ.

European Commission - Horizon 2020 Framework Programme
Grant/Award No: 101003470 - Next Generation Earth Modelling Systems (NextGEMS)
Findable: 6 of 7 level;
Accessible: 2 of 3 level;
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4. The data sizes are controlled and correct: passed;
5. The spatial-temporal coverage description (metadata) is consistent to the data, time steps are correct and the time coordinate is continuous: passed;
6. The format is correct: passed;
7. Variable description and data are consistent: passed
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[1] DOI Korn, P.; Brüggemann, N.; Jungclaus, J. H.; Lorenz, S. J.; Gutjahr, O.; Haak, H.; Linardakis, L.; Mehlmann, C.; Mikolajewicz, U.; Notz, D.; Putrasahan, D. A.; Singh, V.; von Storch, J.‐S.; Zhu, X.; Marotzke, J. (2022). ICON‐O: The Ocean Component of the ICON Earth System Model—Global Simulation Characteristics and Local Telescoping Capability. doi:10.1029/2021ms002952
[2] DOI Danilov, Sergey; Sidorenko, Dmitry; Wang, Qiang; Jung, Thomas. (2017). The Finite-volumE Sea ice–Ocean Model (FESOM2). doi:10.5194/gmd-10-765-2017
[3] DOI Scholz, Patrick; Sidorenko, Dmitry; Gurses, Ozgur; Danilov, Sergey; Koldunov, Nikolay; Wang, Qiang; Sein, Dmitry; Smolentseva, Margarita; Rakowsky, Natalja; Jung, Thomas. (2019). Assessment of the Finite-volumE Sea ice-Ocean Model (FESOM2.0) – Part 1: Description of selected key model elements and comparison to its predecessor version. doi:10.5194/gmd-12-4875-2019
[4] DOI Scholz, Patrick; Sidorenko, Dmitry; Danilov, Sergey; Wang, Qiang; Koldunov, Nikolay; Sein, Dmitry; Jung, Thomas. (2022). Assessment of the Finite-VolumE Sea ice–Ocean Model (FESOM2.0) – Part 2: Partial bottom cells, embedded sea ice and vertical mixing library CVMix. doi:10.5194/gmd-15-335-2022

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[Entry acronym: nextGEMS_WP6oc] [Entry id: 5273690]