Repeat Observations by Gliders in the Equatorial Region (ROGER)

CMIPx thumb

The Equatorial Undercurrent. Mean zonal velocity (m/s) along 93掳W across all CMIP6 models. Adapted from Karnauskas et al. (2020, J. Geophys. Res.鈥揙ceans).

ROGER was an NSF-funded project from 2012鈥�2016 ( and ). This page provides access to the data analyzed in the following publication:

Karnauskas, K. B., J. Jakoboski, T. M. S. Johnston, W. B. Owens, D. L. Rudnick, and R. E. Todd, 2020: The Pacific Equatorial Undercurrent in Three Generations of Global Climate Models and Glider Observations. J. Geophys. Res.鈥揙ceans, doi: 10.1029/2020JC016609.

As described in the paper, all CMIP3, CMIP5 and CMIP6 global climate model outputs were initially acquired from the (ESGF). Monthly means from the 1990s were extracted from each model鈥檚 historical experiment (labeled 鈥淐limate of the Twentieth Century鈥� [20C3M] in CMIP3, and simply 鈥渉istorical鈥� in CMIP5 and CMIP6). A much-reduced and harmonized version of the entire CMIPx ocean zonal velocity (and potential temperature and salinity for CMIP6) output data set was then produced by retaining the time-means of 3D output within the domain 160掳E鈥�80掳W, 3掳S鈥�3掳N, 0鈥�400 m and linearly regridding to a common grid (0.25掳 in longitude, 0.1掳 in latitude and 1 m in depth). Sections along 93掳W were also saved. The resulting analysis sets are provided freely here. Each link below leads to a folder containing one .mat file for each model, which can be downloaded individually or en masse. This table is necessary to match model numbers with the official CMIPx model identifiers (e.g., C5_M11.mat = CMIP5 / GFDL CM3).

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Spatially reduced and regridded time mean CMIPx fields

Zonal velocity volumes near the equator (3掳S鈥�3掳N, 160掳E鈥�80掳W, 0鈥�400 m)

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Zonal velocity sections along 93掳W (3掳S鈥�3掳N, 0鈥�500 m)

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Potential temperature sections along 93掳W (3掳S鈥�3掳N, 0鈥�500 m)

Salinity sections along 93掳W (3掳S鈥�3掳N, 0鈥�500 m)

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Observations

Spray glider data hosted by UCSD/Scripps Institution of Oceanography:

Acoustic Doppler Current Profiler (ADCP) climatology of Johnson et al. (2002) hosted by NOAA/Pacific Marine Environmental Laboratory:

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Related Publications

Rudnick, D. L., W. B. Owens, T. M. S. Johnston, K. B. Karnauskas, J. Jakoboski, and R. E. Todd, 2020: . J. Phys. Oceanogr., doi: 10.1175/JPO-D-20-0064.1.

Jakoboski, J. K., R. E. Todd, W. B. Owens, K. B. Karnauskas, and D. L. Rudnick, 2020: . J. Phys. Oceanogr., 50, 887鈥�905, doi: 10.1175/JPO-D-19-0110.1.