A review of ocean color algorithms to detect Trichodesmium oceanic blooms and quantify chlorophyll concentration in shallow coral lagoons of South Pacific archipelagos

Dupouy, Cecile and Whiteside, Andra and Tan, Jing and Wattelez, Guillaume and Murakami, Hiroshi and Andreoli, Remi and Lefevre, Jerome and Rottgers, Rudiger and Singh, Awnesh M. and Frouin, Robert (2023) A review of ocean color algorithms to detect Trichodesmium oceanic blooms and quantify chlorophyll concentration in shallow coral lagoons of South Pacific archipelagos. Remote Sensing, 15 (21). NA. ISSN 2072-4292

PDF - Published Version Restricted to Repository staff only Download (6MB)

Abstract

The oceanic waters of the Southwest Tropical Pacific occupy a vast region including multiple Pacific Island Countries. The state of these waters is determinant for fisheries and the blue economy. Ocean color remote sensing is the main tool to survey the variability and long-term evolution of these large areas that are important for economic development but are affected by climate change. Unlike vast oligotrophic gyres, tropical waters are characterized by numerous archipelagos and islands, with deep and shallow lagoons subjected to the large impacts of the land. Strikingly large dendritic phytoplankton (Trichodesmium) blooms with high levels of chlorophyll, developing within archipelagos, as well as coastal enrichments from various origins may be observed. Algorithms to detect the presence of Trichodesmium have been developed or adapted, as well as algorithms to estimate the chlorophyll concentration ([Chl-a)]. Adapting existing [Chl-a] algorithms does not always yield high, i.e., sufficient, accuracy. A review of published regional bio-optical algorithms developed taking into account the specific phytoplankton composition and minimizing the adverse impacts of particles and the seabed bottom on [Chl-a] determination is presented, as well the bio-optical database that allowed their development. The interest of such algorithms for a variety of applications and scientific accomplishments is highlighted, with a view to further addressing the main biology and biogeochemistry questions, e.g., to determine the true impact of diazotrophs and assess lagoon [Chl-a] variability with the highest confidence. This work anticipates the use of future coarse and high-spatial-resolution and multi- and hyper-spectral satellite imagery in the Pacific.

Item Type:	Journal Article
Subjects:	Q Science > Q Science (General) > Q1-295 General Q Science > QC Physics > QC1-75 General Q Science > QC Physics > QC350-467 Optics. Light Q Science > QC Physics > QC980-999 Climatology and weather
Divisions:	Pacific Centre for Environment and Sustainable Development (PACE-SD)
Depositing User:	Awnesh Singh
Date Deposited:	01 Feb 2024 00:33
Last Modified:	01 Feb 2024 00:33
URI:	https://repository.usp.ac.fj/id/eprint/14291

Actions (login required)

View Item