REMOTE SENSING OF ENVIRONMENT | 卷:215 |
An optimized Chlorophyll a switching algorithm for MERIS and OLCI in phytoplankton-dominated waters | |
Article | |
Smith, M. E.1  Lain, L. Robertson2  Bernard, S.1  | |
[1] CSIR, NRE Earth Observat, 15 Lower Hope Rd, ZA-7700 Cape Town, South Africa | |
[2] Univ Cape Town, Dept Oceanog, ZA-7700 Cape Town, South Africa | |
关键词: OLCI; MERIS; Chlorophyll a; Southern Benguela; | |
DOI : 10.1016/j.rse.2018.06.002 | |
来源: Elsevier | |
【 摘 要 】
Productive upwelling zones such as the southern Benguela can exhibit phytoplankton biomass variability over several orders of magnitude, from near oligotrophic offshore waters to hypertrophic inshore blooms of > 100 mg m(-3). This introduces complexity for ocean colour applications such as Harmful Algal Bloom (HAB) monitoring. As low and high biomass algorithmic approaches for ocean colour differ, no single algorithm can optimally retrieve accurate Chl a over such a wide range of biomass. We propose a novel technique to apply and blend two different Chl a algorithms - an empirical blue-green algorithm for low to moderate biomass and a red-NIR band-ratio algorithm for moderate to high biomass. The blending method is based on the 708 and 665 nm reflectance wavelength ratio, where the blue-green algorithm is applied when the rho(w)(708)/rho(w)(665) ratio is < 0.75, the red-NIR algorithm is applied > 1.15, whilst the two are blended using a weighted approach in between these values. When applied to in situ and satellite match-up data this method provides a median absolute relative difference (MARD) of 37.9 and 45.7%, respectively, and a RMSD of 0.27 and 0.35 respectively, over Chl a concentrations spanning three orders of magnitude. Application is demonstrated for both MERIS and OLCI sensors, providing a smooth transition between different biomass levels and algorithm Chl a returns.
【 授权许可】
Free
【 预 览 】
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