Acta Oceanologica Sinica

, Volume 32, Issue 5, pp 75–81

FY-3A/MERSI, ocean color algorithm, products and demonstrative applications

  • Ling Sun
  • Maohua Guo
  • Jianhua Zhu
  • Xiuqing Hu
  • Qingjun Song
Article

DOI: 10.1007/s13131-013-0316-2

Cite this article as:
Sun, L., Guo, M., Zhu, J. et al. Acta Oceanol. Sin. (2013) 32: 75. doi:10.1007/s13131-013-0316-2

Abstract

A medium resolution spectral imager (MERSI) on-board the first spacecraft of the second generation of China’s polar-orbit meteorological satellites FY-3A, is a MODIS-like sensor with 20 bands covering visible to thermal infrared spectral region. FY-3A/MERSI is capable of making continuous global observations, and ocean color application is one of its main targets. The objective is to provide information about the ocean color products of FY-3A/MERSI, including sensor calibration, ocean color algorithms, ocean color products validation and applications. Although there is a visible on-board calibration device, it cannot realize the on-board absolute radiometric calibration in the reflective solar bands. A multisite vicarious calibration method is developed, and used for monitoring the in-flight response change and providing post-launch calibration coefficients updating. FY-3A/MERSI ocean color products consist of the water-leaving reflectance retrieved from an atmospheric correction algorithm, a chlorophyll a concentration (CHL1) and a pigment concentration (PIG1) from global empirical models, the chlorophyll a concentration (CHL2), a total suspended mater concentration (TSM) and the absorption coefficient of CDOM and NAP (YS443) from China’s regional empirical models. The atmospheric correction algorithm based on lookup tables and ocean color components concentration estimation models are described. By comparison with in situ data, the FY-3A/MERSI ocean color products have been validated and preliminary results are presented. Some successful ocean color applications such as algae bloom monitoring and coastal suspended sediment variation have demonstrated the usefulness of FY-3A/MERSI ocean color products.

Key words

FY-3A/MERSI ocean color multisite calibration atmospheric correction China’s regional model 

Copyright information

© The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Ling Sun
    • 1
    • 2
  • Maohua Guo
    • 3
  • Jianhua Zhu
    • 4
  • Xiuqing Hu
    • 1
    • 2
  • Qingjun Song
    • 3
  1. 1.Key Laboratory of Radiometric Calibration and Validation for Environmental SatellitesChina Meteorological Administration (LRCVES/CMA)BeijingChina
  2. 2.National Satellite Meteorological CentreChina Meteorological AdministrationBeijingChina
  3. 3.National Satellite Ocean Application ServiceState Oceanic AdministrationBeijingChina
  4. 4.National Ocean Technology CentreState Oceanic AdministrationTianjinChina