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水體組分光譜耦合效應(yīng)研究
摘要：自然水體不同組分光譜之間存在復(fù)雜的耦合作用機制,由此導(dǎo)致水體光學(xué)特性的高度復(fù)雜性,給水質(zhì)參數(shù)遙感反演帶來了很大的不確定性,目前對此缺乏系統(tǒng)性認識.基于水體光學(xué)Monte Carlo高光譜模擬,研究了典型可遙感水質(zhì)參數(shù)葉綠素a(Chl.a)、總懸浮物(TSM)與黃色物質(zhì)(CDOM)光譜特征之間的耦合效應(yīng).結(jié)果表明:水體組分之間的光學(xué)影響具有不對等性;Chl.a與C130M的存在不影響TSM信息提取時特征波段的選擇;由Chl.a主導(dǎo)的水體對TSM的信息提取影響甚微,而TSM對Chl.a反射光譜產(chǎn)生的影響非常顯著.隨著TSM濃度不斷增加,Chl.a的濃度對反射率的響應(yīng)不斷減弱,當TSM濃度達到一定水平時,Chl.a的反射光譜對其濃度的變化完全失去響應(yīng).即使在Chl.a敏感的特征波段670 nm,當TSM較高時,其光學(xué)特性可完全湮沒Chl.a的光譜響應(yīng),使得在高濃度TSM的水體中提取Chl.a的濃度信息非常困難.CDOM的存在使得藍綠波段比值算法在Chl.a在中高濃度時失效;由TSM主導(dǎo)的水體比由Chl.a主導(dǎo)的水體對CDOM的光學(xué)影響更為顯著,TSM對于短波區(qū)域CDOM的光學(xué)特性具有更強的抑制性.研究結(jié)果可為水質(zhì)遙感波段的選取、水體組分反演算法的適用濃度范圍及水色衛(wèi)星傳感器的波段設(shè)置等方面提供了理論基礎(chǔ),尤其對于二類水體水質(zhì)遙感的發(fā)展具有較大的促進作用.Abstract：Based on aquatic optics Monte Carlo hyperspectral simulation,the interactions between spectral characteristics of chlorophyll a,total suspended matter(TSM)and colored dissolved organic matter(CDOM)were discussed.The result shows thatthe nonlinear and spectrally varying interactions between different water components are extremely highly asymmetric.The existing of chlorophyll a and CDOM has little effects on the characteristic wavebands selection and information retrieval of TSM,while the effects of TSM on chlorophyll a are obvious.With the stepwise additions of TSM,the response of chlorophyll a to its concentration becomes weak.When the concentration of TSM increases to a certain degree,the spectral response of chlorophyll a concentration will disappear.Even at the sensitivity waveband of chlorophyll a such as 670 nm,when the TSM is in high concentration,the spectral reflectance will not change with chlorophyll a concentration,which lead to difficulty to extract the chlorophyll a concentration in turbid water dominated by suspended matter.The existing of CDOM causes the blue and green band ratio algorithm to fail when the chlorophyll a is in middle to high concentration.The spectral effects on CDOM of the water body dominated by TSM are more obvious than that dominated by chlorophyll a.There are strong inhibition effects of TSM on the CDOM spectral properties in the short bands.The research results can provide theoretical basis for characteristic waveband selection,the application scope of water component concentration inversion algorithm and the waveband setting for case 2 water remote sensing. 作者： 周冠華[1]田國良[2]陳軍[3]李京[4]宮阿都[4] Author： ZHOU Guan-hua[1] TIAN Guo-liang[2] CHEN Jun[3] LI Jing[4] GONG A-du[4] 作者單位： 北京師范大學(xué)資源學(xué)院,北京,100875;北京航空航天大學(xué)儀器科學(xué)與光電工程學(xué)院,北京,100191中國科學(xué)院遙感應(yīng)用研究所,北京,100101青島海洋地質(zhì)研究所,山東,青島,266071民政部/教育部減災(zāi)與應(yīng)急管理研究院,北京,100875 期 刊： 光譜學(xué)與光譜分析 ISTICEISCIPKU Journal： SPECTROSCOPY AND SPECTRAL ANALYSIS 年，卷(期)： 2010, 30(2) 分類號： X87 關(guān)鍵詞： 水色遙感 光譜耦合效應(yīng) 蒙特卡羅模擬 Keywords： Ocean color remote sensing Spectral coupling effects Monte Carlo simulation 機標分類號： S96 TU9 機標關(guān)鍵詞： 體組分 光譜耦合 效應(yīng)研究 Water Quality Coupling Effects TSM 水體 濃度 suspended matter 光學(xué)特性 interactions dissolved organic matter Monte Carlo information retrieval 特征波段 spectral reflectance spectral properties inversion algorithm theoretical basis spectral response 基金項目： 國家自然科學(xué)基金，國家科技支撐計劃課胚，教育部人文社會科學(xué)規(guī)劃項目【水體組分光譜耦合效應(yīng)研究】相關(guān)文章：
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