Calibration and validation of the ocean color version-3 product from ADEOS OCTS

Masanobu Shimada, Hiromi Oaku, Yasushi Mitomi, Hiroshi Murakami, Akira Mukaida, Yasuhisa Nakamura, Joji Ishizaka, Hiroshi Kawamura, Tasuku Tanaka, Motoaki Kishino, Hajime Fukushima

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

We present calibration and validation results of the OCTS's ocean color version-3 product, which mainly consists of the chlorophyll-a concentration (Chl-a) and the normalized water-leaving radiance ((n)L(w)). First, OCTS was calibrated for the inter-detector sensitivity difference, offset, and absolute sensitivity using external calibration source. It was also vicariously calibrated using in-situ measurements for water (Chl-a and (n)L(w)) and atmosphere (optical thickness), which were acquired synchronously with OCTS under cloud-free conditions. Second, the product was validated using selected 17 in-situ Chl-a and 11 in-situ (n)L(w) measurements. We confirmed that Chl-a was estimated with an accuracy of 68% for Chl-a less than 2 mg/m3, and (n)L(w) from 94% (band 2) to 128% (band 4). Geometric accuracy was improved to 1.3 km. Stripes were significantly reduced by modifying the detector normalization factor as a function of input radiance.

Original languageEnglish
Pages (from-to)401-416
Number of pages16
JournalJournal of Oceanography
Volume54
Issue number5
DOIs
Publication statusPublished - 1998 Oct
Externally publishedYes

Keywords

  • ADEOS
  • AVIRIS
  • Calibration
  • Chlorophyll-a
  • NASDA
  • OCTS
  • Ocean color
  • Radiance
  • Validation

ASJC Scopus subject areas

  • Oceanography

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