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<p>This study presents the first intercomparison of multiple high resolution ocean reanalysis products which include three global eddy permitting reanalysis (CGLORS, GLORYS, ORAS5) and one eddy resolving reanalysis (GLORYS12v) in the Indian Ocean. Satellite based validation revealed systematic biases in the surface temperature and salinity, linked to the discrepancies in air sea heat flux parametrization and freshwater inputs. All reanalysis overestimated (underestimated) the marine heatwave (MHW) durations (mean intensities) at major locations. Eddy kinetic energy analyses reveal that only the eddy resolving product aligned well with the satellite altimetry, underscoring the necessity of resolving mesoscale processes. Although all products capture the seasonal patterns of mixed layer depth and thermocline variability at the buoy location, an overestimation is seen in the reanalyses. Overall GLORYS12v, an eddy resolving reanalysis product performed well among other products in representing the marine heatwaves, eddy energetics and variabilities of mixed layer and thermocline depth in the North Indian Ocean. This study exposes critical gaps in current reanalyses, including overshooting of MHW lifecycles, underestimation of eddy energetics and misrepresentation of subsurface thermohaline structures. The findings emphasize the importance of improving the sub gridscale parametrizations, enhanced eddy resolving capabilities and targeted assimilation of regional observational networks.</p>

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Assessing ocean reanalysis accuracy for marine extremes in the Indian ocean using in-situ observations

  • 期刊论文

  • 发表日期：

    2025年8月30日

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  • Avinash Paul,
  • P. A. Maheswaran,
  • K. Satheesan,
  • Ajil Kottayil

摘要

This study presents the first intercomparison of multiple high resolution ocean reanalysis products which include three global eddy permitting reanalysis (CGLORS, GLORYS, ORAS5) and one eddy resolving reanalysis (GLORYS12v) in the Indian Ocean. Satellite based validation revealed systematic biases in the surface temperature and salinity, linked to the discrepancies in air sea heat flux parametrization and freshwater inputs. All reanalysis overestimated (underestimated) the marine heatwave (MHW) durations (mean intensities) at major locations. Eddy kinetic energy analyses reveal that only the eddy resolving product aligned well with the satellite altimetry, underscoring the necessity of resolving mesoscale processes. Although all products capture the seasonal patterns of mixed layer depth and thermocline variability at the buoy location, an overestimation is seen in the reanalyses. Overall GLORYS12v, an eddy resolving reanalysis product performed well among other products in representing the marine heatwaves, eddy energetics and variabilities of mixed layer and thermocline depth in the North Indian Ocean. This study exposes critical gaps in current reanalyses, including overshooting of MHW lifecycles, underestimation of eddy energetics and misrepresentation of subsurface thermohaline structures. The findings emphasize the importance of improving the sub gridscale parametrizations, enhanced eddy resolving capabilities and targeted assimilation of regional observational networks.