Inherent Optical Properties in Lake Taihu Derived from VIIRS Satellite Observations
Wei Shi, Menghua Wang, Yunlin Zhang
Remote Sensing · 2019
doi:10.3390/rs11121426 (opens in a new tab)
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Abstract
Using in situ remote sensing reflectance and inherent optical property (IOP) measurements, a near-infrared (NIR)-based IOP algorithm is developed and tuned for Lake Taihu, in order to derive the particle backscattering coefficient <i>b<sub>bp</sub></i>(<i>λ</i>), total absorption coefficient <i>a<sub>t</sub></i>(<i>λ</i>), dissolved and detrital absorption coefficient <i>a<sub>dg</sub></i>(<i>λ</i>), and phytoplankton absorption coefficient <i>a<sub>ph</sub></i>(<i>λ</i>), with satellite observations from the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (SNPP). The IOP algorithm for Lake Taihu has a reasonably good accuracy. In fact, the determination coefficients between the retrieved and in situ IOPs are 0.772, 0.638, and 0.487 for <i>a<sub>t</sub></i>(<i>λ</i>), <i>a<sub>dg</sub></i>(<i>λ</i>), and <i>a<sub>ph</sub></i>(<i>λ</i>), respectively. The IOP products in Lake Taihu that have been derived from VIIRS-SNPP observations show significant spatial and temporal variations. Southern Lake Taihu features enhanced <i>b<sub>bp</sub></i>(<i>λ</i>) and <i>a<sub>dg</sub></i>(<i>λ</i>), while northern Lake Taihu shows higher <i>a<sub>ph</sub></i>(<i>λ</i>). The seasonal and interannual variability of <i>a<sub>dg</sub></i>(<i>λ</i>) and <i>b<sub>bp</sub></i>(<i>λ</i>) in Lake Taihu is quantified and characterized with the highest <i>b<sub>bp</sub></i>(<i>λ</i>) and <i>a<sub>dg</sub></i>(<i>λ</i>) in the winter, and the lowest in the summer. In the winter, <i>b<sub>bp</sub></i>(443) and <i>a<sub>dg</sub></i>(443) can reach over ~1.5 and ~5.0 m<sup>−1</sup>, respectively, while they are ~0.5−1.0 and ~2.0 m<sup>−1</sup> in the summer. This study shows that in Lake Taihu <i>a<sub>dg</sub></i>(<i>λ</i>) is the most significant IOP, while <i>a<sub>ph</sub></i>(<i>λ</i>) is the least in terms of the IOP values and contributions to remote sensing reflectance. The highest <i>b<sub>bp</sub></i>(<i>λ</i>) and <i>a<sub>dg</sub></i>(<i>λ</i>) occurred in the winter between 2017−2018, and the lowest <i>b<sub>bp</sub></i>(<i>λ</i>) and <i>a<sub>dg</sub></i>(<i>λ</i>) occurred in the summer of 2014. In comparison, the seasonal and interannual variability of mean <i>a<sub>ph</sub></i>(<i>λ</i>) for Lake Taihu is less significant, even though enhanced seasonal and interannual variability can be found in some parts of Lake Taihu, such as in the northern Lake Taihu region.
Abstract licence: CC BY
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