Absorption and scattering properties of water body in Taihu Lake, China: absorption

Ma, Ronghua; Tang, Junwu; Dai, Jianli; Zhang, Y.; Song, Qingjun

doi:10.1080/01431160600851835

Cited by 70 publications

(58 citation statements)

References 37 publications

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“…Chla was then determined spectrophotometrically following community-accepted protocols [54,55]. Specifically, a 47-mm Whatman GF/F glass fiber filter was used to filter the water and was subsequently soaked in 90% ethanol for 4-6 h in the dark.…”

Section: Field Datamentioning

confidence: 99%

An EOF-Based Algorithm to Estimate Chlorophyll a Concentrations in Taihu Lake from MODIS Land-Band Measurements: Implications for Near Real-Time Applications and Forecasting Models

Duan

et al. 2014

Remote Sensing

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For near real-time water applications, the Moderate Resolution Imaging Spectroradiometers (MODIS) on Terra and Aqua are currently the only satellite instruments that can provide well-calibrated top-of-atmosphere (TOA) radiance data over the global aquatic environments. However, TOA radiance data in the MODIS ocean bands over turbid atmosphere in east China often saturate, leaving only four land bands to use. In this study, an approach based on Empirical Orthogonal Function (EOF) analysis has been developed and validated to estimate chlorophyll a concentrations (Chla, μg/L) in surface waters of Taihu Lake, the third largest freshwater lake in China. The EOF approach analyzed the spectral variance of normalized Rayleigh-corrected reflectance (Rrc) data at 469, 555, 645, and 859 nm, and subsequently related that variance to Chla using 28 concurrent MODIS and field measurements. This empirical algorithm was then validated using another 30 independent concurrent MODIS and field measurements. Image analysis and radiative transfer simulations indicated that the algorithm appeared to be tolerant to aerosol perturbations, with unbiased RMS uncertainties of <80% for Chla ranging between 3 and 100 μg/L. Application OPEN ACCESSRemote Sens. 2014, 6 10695 of the algorithm to a total of 853 MODIS images between 2000 and 2013 under cloud-free conditions revealed spatial distribution patterns and seasonal changes that are consistent to previous findings based on floating algae mats. The current study can provide additional quantitative estimates of Chla that can be assimilated in an existing forecast model, which showed improved performance over the use of a previous Chla algorithm. However, the empirical nature, relatively large uncertainties, and limited number of spectral bands all point to the need of further improvement in data availability and accuracy with future satellite sensors.

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Section: Field Datamentioning

confidence: 99%

An EOF-Based Algorithm to Estimate Chlorophyll a Concentrations in Taihu Lake from MODIS Land-Band Measurements: Implications for Near Real-Time Applications and Forecasting Models

Duan

et al. 2014

Remote Sensing

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“…Openocean water receives less impact from land and human activity, and thus has optical properties that are relatively stable at a large spatial scale. Due to strong impact from land and human activity, Case 2 water has greater variability spatially and temporarily in optical properties (Stedmon et al, 2000;Babin et al, 2003;Twardowski et al, 2004;Ma et al, 2006). Studies of the optical properties of high mountain lakes (Tartarotti et al, 1999;Laurion et al, 2000;Zhou et al, 2005;Tartarotti & Sommaruga, 2006;Zhang et al, 2009;Zhang et al, 2010;Ficek et al, 2013) have received considerable attention partly because of their harsh environment and partly because remotely located lakes can be considered as sensitive indicators of environmental and climate changes (SommarugaWögrath et al, 1997;Williamson et al, 2008;Adrian et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Impact of particulate and dissolved material on light absorption properties in a High-Altitude Lake in Tibet, China

et al. 2015

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Ground-based measurements of optical properties have rarely been conducted for lakes located on the Tibetan Plateau (TP). In this study, we analyzed the spectral absorption properties of phytoplankton, non-algal particles, and colored dissolved organic matter sampled in Lake Namtso on the TP in order to obtain the variability in the light absorption properties of each of these three components and the relative contribution of each component. The Chlorophyll-a concentration was found to be very low. The mean value of the spectral slope S 280À500 for CDOM absorption was found to be 0.036 nm À1 , whereas the corresponding mean value for S 350À500 was found to be 0.015 nm À1 , implying that when comparing spectral slope values with published values, the wavelength range used for deriving them should be considered. Additional peaks were found for phytoplankton sampled in Lake Namtso in the wavelength ranges 310-370 and 600-640 nm, indicating a significant contribution by accessory pigments to the phytoplankton absorption. The Chlorophyll-a specific absorption coefficients of phytoplankton ½a Ã phy ðkÞ at 440 and 675 nm in Lake Namtso were found to be much higher than previously reported values, due to the combination of a small package effect and contributions by accessory pigments.Keywords High-altitude lake Á Colored dissolved organic matter Á Phytoplankton Á Total suspended matter Handling editor:

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“…作为水体的固有光学特性, 颗粒物(包括非色素颗粒物和浮游植物色素颗粒物)的光谱吸收是水色遥感生物光学模型中的重要参数, 它可直接影响太阳辐射在水下的传输和分布, 并进一步影响水生系统的结构和功能 [5] . 虽然国外早已有较多关于水体颗粒物吸收特性的研究报告 [6][7][8] , 但在国内关于这方面的研究仍然比较缺乏 [9] , 并且多数研究都是针对海洋水体和长江中下游的内陆二类水体 [10][11][12] …”

Section: 对于二类水体如何确定光谱信息中不同成分的贡献率对于实现水色遥感信息定量化显得尤其重要近年来随着水色遥感的发unclassified

Spectral absorption properties of particulate matters in the Shitoukoumen Reservoir of Changchun City

Fang¹,

Xu²,

Yan-fen³

et al. 2009

Journal of Lake Sciences

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吸收曲线在 440nm 左右能明显看到浮游植物引起的吸收峰; 非色素颗粒物在 440nm 的吸收系数与悬浮物浓度存在较好的函数关系, 而与叶绿素 a 浓度的相关性较弱; 浮游植物色素吸收系数较低, 色素组成中叶绿素 a 占主导地位, 浮游植物在 440nm 和 675nm 的吸收系数与叶绿素 a 含量均存在较好的指数函数关系; 6 月浮游植物比吸收系数在 440nm 和 750nm 的均值分别为 0.0483m2 /mg 和 0.0263m 2 /mg, 而 9 月份的均值分别为 0.0337m 2 /mg 和 0.0187m 2 /mg. Abstract: The Shitoukoumen Reservoir, an urban water resource of Changchun City, was chose as a represent case of waters in Northeast of China, and then its spectral absorption properties of particulates were analyzed using the field data on June 13th and September 23rd 2008, respectively. Results showed that the content of total suspended matters (TSM) was higher but content of chlorophyll-a (Chl.a) was lower in June than that in September. The spectral curves of TSM were similar to that of tripton. Tripton contributed much more than phytoplankton in the absorption by TSM. In September, the contribution coming from phytoplankton slightly increased, which resulted in an obvious absorption peak around 440nm in the spectral absorption curves of TSM. Absorption by tripton at 440nm had a good relationship with TSM but not with Chl.a. The absorption of phytoplankton in ShitoukoumenReservoir was generally low. Chl.a held the majority of the pigment composition and had good exponential relationships with its absorption at 440nm and 675nm, respectively. The average values of phytoplankton specific absorption coefficient at 440nm and 675nm in June were 0.0483m 2 /mg and 0.0263m 2 /mg respectively, while the data in September were 0.0337m 2 /mg and 0.0187m 2 /mg respectively.

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Absorption and scattering properties of water body in Taihu Lake, China: absorption

Cited by 70 publications

References 37 publications

An EOF-Based Algorithm to Estimate Chlorophyll a Concentrations in Taihu Lake from MODIS Land-Band Measurements: Implications for Near Real-Time Applications and Forecasting Models

An EOF-Based Algorithm to Estimate Chlorophyll a Concentrations in Taihu Lake from MODIS Land-Band Measurements: Implications for Near Real-Time Applications and Forecasting Models

Impact of particulate and dissolved material on light absorption properties in a High-Altitude Lake in Tibet, China

Spectral absorption properties of particulate matters in the Shitoukoumen Reservoir of Changchun City

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