Document of bibliographic reference 294603

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Improving the remote sensing retrieval of Phytoplankton Functional Types (PFT) using empirical orthogonal functions: A case study in a coastal upwelling region

Abstract

An approach that improves the spectral-based PHYSAT method for identifying phytoplankton functional types (PFT) in satellite ocean-color imagery is developed and applied to one study case. This new approach, called PHYSTWO, relies on the assumption that the dominant effect of chlorophyll-a (Chl-a) in the normalized water-leaving radiance (nLw) spectrum can be effectively isolated from the signal of accessory pigment biomarkers of different PFT by using Empirical Orthogonal Function (EOF) decomposition. PHYSTWO operates in the dimensionless plane composed by the first two EOF modes generated through the decomposition of a space–nLw matrix at seven wavelengths (412, 443, 469, 488, 531, 547, and 555 nm). PFT determination is performed using orthogonal models derived from the acceptable ranges of anomalies proposed by PHYSAT but adjusted with the available regional and global data. In applying PHYSTWO to study phytoplankton community structures in the coastal upwelling system off central Chile, we find that this method increases the accuracy of PFT identification, extends the application of this tool to waters with high Chl-a concentration, and significantly decreases (~60%) the undetermined retrievals when compared with PHYSAT. The improved accuracy of PHYSTWO and its applicability for the identification of new PFT are discussed.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000435187500010

Bibliographic citation

Correa-Ramirez, M.; Morales, C.; Letelier, R.; Anabalón, V.; Hormazabal, S. (2018). Improving the remote sensing retrieval of Phytoplankton Functional Types (PFT) using empirical orthogonal functions: A case study in a coastal upwelling region. Remote Sens. 10(4): 498. https://dx.doi.org/10.3390/rs10040498

Topic

Marine

Is peer reviewed

true

Access rights

open access

Is accessible for free

true