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Investigating the robustness of the intraseasonal see-saw in the Indo-Pacific barotropic sea level across models

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Abstract

An intraseasonal see-saw has been observed in the Indo-Pacific barotropic sea level anomaly during boreal winters. This see-saw carries a significant amount of energy and is crucial for the tropical sea level and angular momentum budget. Here, we evaluate the performance of several state-of-the-art ocean general circulation models (OGCMs), including the Modular Ocean Model (MOM), the Nucleus for European Modeling of the Ocean (NEMO), Massachusetts Institute of Technology general circulation model (MITgcm), and the HYbrid Coordinate Ocean Model (HYCOM) in reproducing the see-saw. Regardless of differences in model physics, forcings, setup, and resolution, all OGCMs simulate see-saw in the Indo-Pacific oceanic mass, making it a robust oceanic phenomenon. The models with horizontal resolutions ranging from 25 to 9 km, particularly those with higher resolution, are successful at simulating the qualitative characteristics of the see-saw. We show that a proper representation of the Indonesian straits is vital for a reasonable simulation of the see-saw. Furthermore, we show that the inclusion of the polar ocean in the models has little impact on the see-saw structure, implying that OGCMs with semi-global domain are appropriate tools for capturing the see-saw dynamics.

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Data availability

ECCO v4r4 model data is available from Earth Data (https://search.earthdata.nasa.gov/projects?p=!C1990404797-POCLOUD&pg[1][v]=t&pg[1][m]=download&tl=1629883998!3!!). ECCO2 can be downloaded from APDRC website (http://apdrc.soest.hawaii.edu/las/v6/dataset?catitem=4922). The BPR data are obtained from NDBC (http://www.ndbc.noaa.gov/dart.shtml) and INCOIS/NIOT (http://do.incois.gov.in). NEMO, MOM5.1, MOM4p1, and HYCOM data are available on request.

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Acknowledgements

The lead author is grateful to the Council of Scientific and Industrial Research (CSIR) for providing the Research Fellowship grant. This work is supported by INCOIS, MoES, and by the project “Barotropic Influence on Global Ocean (BINGO); grant no 41-DS-GMMC-BINGO-CNRS195918.” This is INCOIS contribution number 461.

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Correspondence to Arya Paul.

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The authors declare no competing interests.

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Responsible Editor: Andrea Pinones

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Afroosa, M., Rohith, B., Paul, A. et al. Investigating the robustness of the intraseasonal see-saw in the Indo-Pacific barotropic sea level across models. Ocean Dynamics 72, 523–538 (2022). https://doi.org/10.1007/s10236-022-01518-8

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  • DOI: https://doi.org/10.1007/s10236-022-01518-8

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