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<p>The Ocean Colour Monitor (OCM) -3 onboard Earth Observation Satellite (EOS) − 06 was launched by the Indian Space Research Organization (ISRO) in November 2022 as a follow-up to OCM-2 (2009). This study evaluates the chlorophyll-<i>a</i> concentration (Chl -<i>a</i>) retrieved from OCM-3 Global Area Coverage (GAC) data by comparing it with in-situ measurements from the biogeochemical – Argo floats (BGC-Argo) in open ocean waters between August 2024 and March 2025. The results show strong agreement between the two data sets. OCM-3 retrieved Chl-<i>a</i> reveals a mean bias of − 0.05&#xa0;mg m⁻³, root mean square error (RMSE) of ± 0.15&#xa0;mg m⁻³ and the unbiased percentage difference is 28.73%, establishing the accuracy of the GAC product. Additionally, the spatial distribution of OCM-3 Chl-<i>a</i> aligns closely with data from the globally accepted Ocean Colour Climate Change Initiative (OC-CCI) data, with minor deviations at high latitudes, including polar regions. These differences point to areas where further refinement is requirement to further enhance OCM-3’s accuracy. These findings suggest that OCM-3 reliably captures chlorophyll concentration on a broad scale, with accuracy comparable to established observational methods, underscoring its value as a data source for climate and ecological research. Ongoing calibration of the and expansion of match-up datasets will improve the accuracy and retrieval fidelity.</p>

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Performance Evaluation of EOS-06 OCM-3 Chlorophyll-a Retrievals in Case-1 Waters

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Chiranjivi Jayaram,
  • Neethu Chacko,
  • Rajdeep Roy,
  • T. Devi Varaprasada Rao,
  • P. V. Nagamani,
  • T. V. S. Udaya Bhaskar,
  • K. N. Babu,
  • Prakash Chauhan

摘要

The Ocean Colour Monitor (OCM) -3 onboard Earth Observation Satellite (EOS) − 06 was launched by the Indian Space Research Organization (ISRO) in November 2022 as a follow-up to OCM-2 (2009). This study evaluates the chlorophyll-a concentration (Chl -a) retrieved from OCM-3 Global Area Coverage (GAC) data by comparing it with in-situ measurements from the biogeochemical – Argo floats (BGC-Argo) in open ocean waters between August 2024 and March 2025. The results show strong agreement between the two data sets. OCM-3 retrieved Chl-a reveals a mean bias of − 0.05 mg m⁻³, root mean square error (RMSE) of ± 0.15 mg m⁻³ and the unbiased percentage difference is 28.73%, establishing the accuracy of the GAC product. Additionally, the spatial distribution of OCM-3 Chl-a aligns closely with data from the globally accepted Ocean Colour Climate Change Initiative (OC-CCI) data, with minor deviations at high latitudes, including polar regions. These differences point to areas where further refinement is requirement to further enhance OCM-3’s accuracy. These findings suggest that OCM-3 reliably captures chlorophyll concentration on a broad scale, with accuracy comparable to established observational methods, underscoring its value as a data source for climate and ecological research. Ongoing calibration of the and expansion of match-up datasets will improve the accuracy and retrieval fidelity.