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Demonstrating the potential of regional ocean model system in simulating the upper ocean characteristic over the Arabian Sea: impact of horizontal resolution

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Abstract

This study intended to demonstrate the capability of the regional ocean model system (ROMS) in reproducing the Arabian Sea’s hydrographic properties (AS). The effect of the horizontal resolution is also explored. The ROMS is integrated over Arabian Sea (AS) for 10 years, encompassing 30 E–80 E and 5 N–30 N at two distinct horizontal resolutions of 1/6 (17 km) and 1/4 (25 km). The results obtained from both simulations show reasonable resemblances to observation and reanalysis in reproducing the spatiotemporal distribution of surface as well as subsurface hydrographic properties such as sea surface temperature (SST), sea surface salinity (SSS), sea surface currents, and subsurface temperature and salinity. The study shows that the variability is governed by annual and seasonal high-resolution setup, which shows better performance for both seasons. The latitude depth plot at 70° E shows the subsurface variability over the AS. The seasonal variability of the Indian summer monsoon (ISM) is dominated by westward north equatorial current and southward moving currents, which are confined to the boundary currents, where basin circulation is generally observed. The increasing resolution shows minimal improvement for AS characteristics on the climatological scale, indicating that it is not always guaranteed to enhance the performance towards increasing horizontal resolution for every aspect.

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The model data is available with the authors, and the rest were acknowledged.

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Acknowledgements

The authors thank DST for supporting this work in the form of INSPIRE Fellowship. Also, they thank Tropical Rainfall Measuring Mission (TRMM), ECMWF, and OSCAR, respectively, for sharing TMI SST, SSS, and SSC datasets used for the analysis.

Funding

The 1st author received DST INSPIRE Fellowship from Department of Science and Technology, Ministry of Science and Technology (INSPIRE Fellowship Code No.: IF170827).

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  1. K. Banerjee Centre of Atmospheric and Ocean Studies, Institute of Interdisciplinary Studies, Nehru Science Centre, University of Allahabad, Prayagraj, 211002, India

    Prabha Kushwaha & Vivek Kumar Pandey

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  1. Prabha Kushwaha
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Both the authors contributed equally. In the present study, the second author, who is the corresponding author, decided the study based on the objective of the PhD thesis and guided the first author on how to do it. The first author has installed and run the ROMS model and analyzed the data of model/observation on the basis of instruction that has been given from time to time by the second author. The second author prepared the framework, and the first author wrote the manuscript which was reviewed by the second author, and then the second author submitted as the corresponding author.

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Correspondence to Vivek Kumar Pandey.

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Kushwaha, P., Pandey, V. Demonstrating the potential of regional ocean model system in simulating the upper ocean characteristic over the Arabian Sea: impact of horizontal resolution. Theor Appl Climatol 148, 427–439 (2022). https://doi.org/10.1007/s00704-022-03934-8

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