Dr. Hui Lei Profile

Dr. Hui Lei

PhD Student at Second Institute of Oceanography SOA

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Publications (6)

Proceedings Article | 14 October 2019 Paper

Development and application of the HAB automatic monitoring system in the East China Sea

Qiankun Zhu, Bangyi Tao, Hui Lei, Fang Gong

Proceedings Volume 11150, 1115015 (2019) https://doi.org/10.1117/12.2532286

KEYWORDS: Satellites, Remote sensing, Image processing, Ocean optics, Satellite imaging, Data acquisition, Oceanography, Earth observing sensors, Reflectivity, Optical properties

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Proceedings Article | 13 October 2011 Paper

HAB detection based on absorption and backscattering properties of phytoplankton

Hui Lei, Delu Pan, Yan Bai, Xiaoyan Chen, Yan Zhou, Qiankun Zhu

Proceedings Volume 8175, 81751F (2011) https://doi.org/10.1117/12.897968

KEYWORDS: Absorption, Backscatter, Remote sensing, Water, Scattering, Particles, Optical properties, Statistical analysis, Satellites, Oceanography

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The coastal area of East China Sea (ECS) suffers from the harmful algal blooms (HAB) frequently every year in the warm season. The most common causative phytoplankton algal species of HAB in the ECS in recent years are Prorocentrum donghaiense (dinoflagellates), Karenia mikimotoi (dinoflagellates which could produce hemolytic and ichthyotoxins) and Skeletonema costatum (diatom). The discrimination between the dinoflagellates and diatom HAB through ocean color remote sensing approach can add the knowledge of HAB events in ECS and help to the precaution. A series of in-situ measurement consisted of absorption coefficient, total scattering and particulate backscattering coefficient was conducted in the southern coast of Zhejiang Province in May 2009, and the estuary of Changjiang River in August 2009 and December 2010, which encountered two HAB events and a moderate bloom. The Inherent Optical Properties (IOPs) of the bloom waters have significant difference between phytoplankton species in absorption and backscattering properties. The chlorophyll a specific absorption coefficient (a*_phy(λ)) for the bloom patches (chlorophyll a concentration >6mg m^-3) differ greatly from the adjacent normal seawater, with the a*_phy(λ) of bloom water lower than 0.03 m² mg^-1 while the a*_phy(λ) of the adjacent normal seawater is much higher (even up to 0.06 m² mg^-1). Meanwhile, the backscattering coefficients at 6 wavebands (420, 442, 470, 510, 590 and 700nm) are also remarkably lower for bloom waters (<0.01 m^-1) than the normal seawater (> 0.02 m^-1). The backscattering coefficient ratio (Rbp(λ)) is much lower for diatom bloom waters than for dinoflagellates types (0.01079 vs. 0.01227). A discrimination model based on IOPs is established, and several typical dinoflagellates and diatom bloom events including Prorocentrum donghaiense, Karenia mikimotoi and Skeletonema costatum in the ECS are picked out for testing with the MODIS-L2 and L3 ocean color remote sensing products from NASA website. The result proves that the satellite-derived inherent optical properties can be used to HAB detection and the discrimination of HAB species from dinoflagellates and the diatom types in the ECS.

Proceedings Article | 4 November 2010 Paper

The extremely high concentration of suspended particulate matter in Changjiang Estuary detected by MERIS data

Yan Bai, Xianqiang He, Delu Pan, Qiankun Zhu, Hui Lei, Bangyi Tao, Zengzhou Hao

Proceedings Volume 7858, 78581D (2010) https://doi.org/10.1117/12.869632

KEYWORDS: Scanning probe microscopy, Algorithm development, Atmospheric corrections, Reflectivity, Remote sensing, Near infrared, Atmospheric particles, Scattering, Aerosols, Rayleigh scattering

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Proceedings Article | 13 October 2008 Paper

Seasonal variation of absorption spectral characteristics of CDOM and de-pigmented particles in East China Sea

Hui Lei, Yan Bai, Haiqing Huang, Delu Pan, Zhihua Mao

Proceedings Volume 7105, 71050R (2008) https://doi.org/10.1117/12.799707

KEYWORDS: Particles, Absorption, Algorithm development, Remote sensing, Signal detection, Ocean optics, In situ remote sensing, Data modeling, Spectral models, Water

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Proceedings Article | 13 October 2008 Paper

Remote sensing algorithm of particle attenuation coefficient in East China Sea

Yan Bai, Xianqiang He, Delu Pan, Zengzhou Hao, Qingjun Song, Hui Lei

Proceedings Volume 7105, 71050Y (2008) https://doi.org/10.1117/12.800077

KEYWORDS: Particles, Signal attenuation, Absorption, Backscatter, Algorithm development, Scattering, Remote sensing, Spectrophotometry, Ocean optics, Data modeling

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China coastal sea is characteristic of the high concentration of suspended matter which has complex components of mineral particles, organic detritus and phytoplankton, etc. The similarity of spectrum characters of mineral particles and organic particles in backscattering coefficient, and the organic detritus and color dissolve organic matters (CDOM) in absorption coefficient makes the information inverse of coastal ocean color become a very difficult work. In this paper, based on the in situ data of optical investigation in East China Sea in the spring of 2003, including the absorption coefficients of CDOM and de-pigment particles from laboratory spectrophotometer measurement, and the field measurement with ac-9 (WET labs, Inc.), the optical properties of suspended particles were studied. And then, a semi-analysis algorithm of particle attenuation coefficient (Cp) in ECS was developed. There are two key steps in this algorithm, one is the estimation of the ratio of particle backscattering coefficient to the total scattering coefficient; and the other is the retrieval of absorption coefficient of CDOM. With this inversion algorithm of Cp and the input of remote sensing reflectance obtained from the underwater profiler radiometer (Satlantic. Inc.), the particle attenuation coefficient was inversed, which was consistent well with the in situ data of Cp . In the high turbid water, the scattering signal is dominant in the Cp values, so the modeled-Cp was less than the in situ data due to the underestimation of backscattering coefficient in IOPs semi-analysis algorithms. The modeled -Cp at 660nm wavelength has the R² of 0.84 and RMSE=0.22 compared with the attenuation coefficient at 650nm measured by the ac-9, in which the absorption coefficient of CDOM is neglect. The semi-analysis algorithms of Cp developed in this paper showed a good potential to estimate the biogeochemical parameters, like POC, but the further study should be focused on the distinguish of the sub-division materials with more in situ data set.

Proceedings Article | 26 October 2007 Paper

Water wake extraction of airphotos based on 2DPCA of polar Fourier spectrum

Haiyang Wang, Delu Pan, Youzhuan Ding, Xianqiang He, Hui Lei

Proceedings Volume 6748, 674819 (2007) https://doi.org/10.1117/12.737479

KEYWORDS: Principal component analysis, Image classification, Fourier transforms, Feature extraction, Facial recognition systems, Image processing, Transform theory, Clouds, Image analysis, Matrices

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