Characterizing the Absorption Properties for Remote Sensing of Three Small Optically-Diverse South African Reservoirs
Characterizing the Absorption Properties for Remote Sensing of Three Small Optically-Diverse South African Reservoirs
复制标题
南非三个小型光学多样性水库遥感吸收特性的表征
作者：
M. Matthews;S. Bernard
表征水组分的特定固有光学特性（SIOP）是遥感应用的基础。因此，本文介绍了吸收特性的浮游植物，gelbstoff和特里普三个小，光学多样性的南非内陆沃茨。三个水库，Hartbeespoort，Loskop和Theewaterskloof，是具有挑战性的遥感，由于浮游植物组合的差异和相当大的范围内的成分浓度。建立了吸收特性与叶绿素a（chl-a）、TChl（chl-a + phaeopigments）、悬浮物、矿物和特里普顿等海洋物理参数之间的关系。在442 nm处测得的质量比的特里普吸收系数a（442）的范围为0.024至0.263 m2·g−1。TChl-特定的浮游植物吸收系数（α）的值的强烈影响浮游植物的种类，大小，附属色素和生物量。在贫营养到富营养沃茨中，a的浓度（440）范围为0.056 ~ 0.018 m2·mg−1。细胞大小和营养状态之间的正相关关系，观察到在开放的海洋沃茨被违反了显着的小蓝藻种群。在620 nm处的藻蓝蛋白特异性浮游植物吸收，a λ（620），被确定为0.007 m2·g−1。铜绿水华。叶绿素a是一个更好的指示浮游植物生物量比藻蓝蛋白（PC）在表层浮渣，由于减少辅助色素的生产。吸收平衡表明，单种水华M。aeruginosa和C. Hirundinella可以被视为“文化”，消除了遥感应用的一些复杂性。这些结果有助于更好地了解IOPs和遥感应用在富营养化的内陆沃茨。然而，大多数的水是光学复杂的，需要使用所有的SIOP在这里推导出的遥感应用。SIOP可用于开发探测叶绿素a、悬浮物、tripton和gelbstoff等地球物理参数的遥感算法，并可用于探测浮游植物类型的高级遥感研究。
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, a∗ (442), ranges from 0.024 to 0.263 m2·g−1. The value of the TChl-specific phytoplankton absorption coefficient (a∗ ) was strongly influenced by phytoplankton species, size, accessory pigmentation and biomass. a∗ (440) ranged from 0.056 to 0.018 m2·mg−1 in oligotrophic to hypertrophic waters. The positive relationship between cell size and trophic state observed in open ocean waters was violated by significant small cyanobacterial populations. The phycocyanin-specific phytoplankton absorption at 620 nm, a∗ (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.