On the feasibility of detecting Trichodesmium blooms with SeaWiFS in the South Western Tropical Pacific

Cécile Dupouy; Dominique Benielli-Gary; Yves Dandonneau; Jacques Neveux; Guillaume Dirberg; Toby Westberry

doi:10.1117/12.806295

19 December 2008 On the feasibility of detecting Trichodesmium blooms with SeaWiFS in the southwestern tropical Pacific

Cécile Dupouy, Dominique Benielli-Gary, Yves Dandonneau, Jacques Neveux, Guillaume Dirberg, Toby Westberry

Author Affiliations +

Proceedings Volume 7150, Remote Sensing of Inland, Coastal, and Oceanic Waters; 715010 (2008) https://doi.org/10.1117/12.806295
Event: SPIE Asia-Pacific Remote Sensing, 2008, Noumea, New Caledonia

Abstract

Trichodesmium, a major colonial cyanobacterial nitrogen fixer, forms large blooms in tropical oligotrophic oceans and enhances CO₂ sequestration by the ocean due to its ability to fix dissolved dinitrogen, however, its detection by satellite has not yet been successful in the South Western Tropical Pacific. Here, an algorithm has been developed for discriminating radiance anomalies observed in SeaWiFS imagery over the summertime Tropical Pacific. Its validation used 70 in situ observations of Trichodesmium accumulations for the period 1997-2004. The fraction of pixels identified as Trichodesmium in the region 5°S-25°S 160°E-190°E is low (between 0.1 and 0.5%) but is about 100 times higher than previous algorithms indicate. The algorithm reproduces the observed seasonal and inter-annual variability of Trichodesmium blooms in the SWTP.

Citation Download Citation

Cécile Dupouy, Dominique Benielli-Gary, Yves Dandonneau, Jacques Neveux, Guillaume Dirberg, and Toby Westberry "On the feasibility of detecting Trichodesmium blooms with SeaWiFS in the southwestern tropical Pacific", Proc. SPIE 7150, Remote Sensing of Inland, Coastal, and Oceanic Waters, 715010 (19 December 2008); https://doi.org/10.1117/12.806295

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