Characterizing the Absorption Properties for Remote Sensing of Three Small Optically-Diverse South African Reservoirs

Remote Sensing

Mark William Matthews¹ 

[1] Marine Remote Sensing Unit, Department of Oceanography, University of Cape Town, Rondebosch, 7701 Cape Town, South Africa

关键词: remote sensing;    inherent optical properties;    inland waters;    absorption;    phycocyanin;    tripton;    phytoplankton;    South Africa;   

DOI  :  10.3390/rs5094370

来源: mdpi

【 摘 要 】

Characterizing the specific inherent optical properties (SIOPs) of water constituents is fundamental to remote sensing applications. Therefore, this paper presents the absorption properties of phytoplankton, gelbstoff and tripton for three small, optically-diverse South African inland waters. The three reservoirs, Hartbeespoort, Loskop and Theewaterskloof, are challenging for remote sensing, due to differences in phytoplankton assemblage and the considerable range of constituent concentrations. Relationships between the absorption properties and biogeophysical parameters, chlorophyll-a (chl-a), TChl (chl-a plus phaeopigments), seston, minerals and tripton, are established. The value determined for the mass-specific tripton absorption coefficient at 442 nm, (620), was determined as 0.007 m²·g⁻¹ in a M. aeruginosa bloom. Chl-a was a better indicator of phytoplankton biomass than phycocyanin (PC) in surface scums, due to reduced accessory pigment production. Absorption budgets demonstrate that monospecific blooms of M. aeruginosa and C. hirundinella may be treated as “cultures”, removing some complexities for remote sensing applications. These results contribute toward a better understanding of IOPs and remote sensing applications in hypertrophic inland waters. However, the majority of the water is optically complex, requiring the usage of all the SIOPs derived here for remote sensing applications. The SIOPs may be used for developing remote sensing algorithms for the detection of biogeophysical parameters, including chl-a, suspended matter, tripton and gelbstoff, and in advanced remote sensing studies for phytoplankton type detection.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland