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<p>The Ocean Colour Monitor (OCM3) onboard the Earth Observation Satellite-06 (EOS06) measures the top of the atmosphere (TOA) radiance over the global ocean water in 13 different spectral bands in the visible and near infra-red (VNIR) region of the electromagnetic spectrum. A very stringent atmospheric correction procedure is implemented to remove the radiance scattered backwards by the atmosphere and reflected by the surface of the water from the Level-1 TOA radiance data to obtain the water-leaving radiance, such that various ocean colour parameters like remote sensing reflectance (<i>R</i><sub><i>rs</i></sub>), chlorophyll-a concentration (<i>chlor_a</i>) and diffuse attenuation coefficient at 490&#xa0;nm (<i>Kd_490</i>) are retrieved at high quality using the EOS06 OCM3 sensor. The Level-2 parameters retrieved in the native spatial resolution of the sensor, 0.0098°/about 1&#xa0;km for Global Area Coverage (GAC) and 0.00327°/about 360&#xa0;m for Local Area Coverage (LAC) scenes, are compared with those of another global ocean colour sensor called Sentinel-3A Ocean and Land Colour Imager (S3A OLCI). Globally gridded daily, 8-day and monthly ocean colour parameters at a spatial resolution of 4.638&#xa0;km (Level-3) are generated from Level-2 GAC products after spatially and temporally binning the corresponding Level-2 ocean colour parameter data. The Level-3 monthly parameters are then compared with the Ocean Colour Climate Change Initiative (OC-CCI). The comparison at Level-2 shows that <i>chlor_a</i> and <i>Kd_490</i> from OCM3 strongly correlate with S3A OLCI (0.912 and 0.804). The Level-3 comparison with OC-CCI also yields similar high correlation results for <i>chlor_a</i> and <i>Kd_490</i> (0.859 and 0.8).</p>

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A Refined Atmospheric Correction Approach for Global Ocean Colour Retrieval from EOS06 OCM3

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Mohammed Suhail,
  • T. Devi Vara Prasada Rao,
  • Reema Mathew,
  • Shashank Kumar Mishra,
  • Abhinav Gummalla,
  • Pullaiahgari Venkata Nagamani,
  • Srinivasa Rao Goru,
  • Prakash Chauhan

摘要

The Ocean Colour Monitor (OCM3) onboard the Earth Observation Satellite-06 (EOS06) measures the top of the atmosphere (TOA) radiance over the global ocean water in 13 different spectral bands in the visible and near infra-red (VNIR) region of the electromagnetic spectrum. A very stringent atmospheric correction procedure is implemented to remove the radiance scattered backwards by the atmosphere and reflected by the surface of the water from the Level-1 TOA radiance data to obtain the water-leaving radiance, such that various ocean colour parameters like remote sensing reflectance (Rrs), chlorophyll-a concentration (chlor_a) and diffuse attenuation coefficient at 490 nm (Kd_490) are retrieved at high quality using the EOS06 OCM3 sensor. The Level-2 parameters retrieved in the native spatial resolution of the sensor, 0.0098°/about 1 km for Global Area Coverage (GAC) and 0.00327°/about 360 m for Local Area Coverage (LAC) scenes, are compared with those of another global ocean colour sensor called Sentinel-3A Ocean and Land Colour Imager (S3A OLCI). Globally gridded daily, 8-day and monthly ocean colour parameters at a spatial resolution of 4.638 km (Level-3) are generated from Level-2 GAC products after spatially and temporally binning the corresponding Level-2 ocean colour parameter data. The Level-3 monthly parameters are then compared with the Ocean Colour Climate Change Initiative (OC-CCI). The comparison at Level-2 shows that chlor_a and Kd_490 from OCM3 strongly correlate with S3A OLCI (0.912 and 0.804). The Level-3 comparison with OC-CCI also yields similar high correlation results for chlor_a and Kd_490 (0.859 and 0.8).