黃渤海懸浮顆粒物粒徑遙感反演研究
發(fā)布時間：2018-08-07 13:58
【摘要】：懸浮顆粒物粒徑是重要的海洋光學參數(shù),在以懸浮顆粒物為主的黃渤海海域,對水體生物,化學過程等起著重要的作用,對其含量和分布特征研究有助于加深對黃渤海生態(tài)環(huán)境的認識,該參數(shù)的衛(wèi)星遙感反演也對海洋光學與水色遙感研究具有重要意義。本文針對懸浮顆粒物粒徑與遙感反射率之間的關(guān)系,主要做了以下幾個方面工作：(1)利用201405、201411以及201508三個航次匹配的實測光學數(shù)據(jù),分別建立了基于GOCI、MODIS以及MERIS三種衛(wèi)星波段設置的遙感反射率單波段或波段比與懸浮顆粒物粒徑D25、D50以及D75之間的反演模型,對模型進行反演精度檢驗以及敏感性分析并對異常數(shù)據(jù)分布進行初步分析。整體而言,基于GOCI、MODIS衛(wèi)星波段設置建立的模型優(yōu)于MERIS,反演的D25、Dso模型優(yōu)于D75模型。(2)基于GOCI衛(wèi)星月合成數(shù)據(jù)反演出粒徑時空分布圖,將反演數(shù)據(jù)與實測數(shù)據(jù)進行精度經(jīng)驗,并分析三種粒徑的月變化以及近三年變化趨勢,結(jié)果表明,三種粒徑反演的粒徑在低值區(qū)以及高值區(qū)反演誤差較大,中間部分反演誤差較小,從沿岸到深海粒徑以及粒徑變化幅度逐漸增大,上半年粒徑低于下半年,近三年變化較小,無明顯變化規(guī)律。(3)基于實測數(shù)據(jù),研究了懸浮顆粒物體積濃度、粒子數(shù)濃度、粒徑等光學參量與固有光學參數(shù)(主要是衰減系數(shù)和顆粒物后向散射系數(shù))之間的關(guān)系；對參數(shù)進行光譜建模,并討論了模型的適用性。結(jié)果表明,懸浮顆粒物后向散射系數(shù)與各光學參數(shù)相關(guān)性較好,衰減系數(shù)與體積濃度以及粒子數(shù)濃度相關(guān)性較好,與粒徑相關(guān)性較差。
[Abstract]:The particle size of suspended particles is an important optical parameter of the ocean, which plays an important role in the biological and chemical processes in the Yellow Sea and Bohai Sea, where suspended particulates are the main ones. The study of its content and distribution is helpful to the understanding of the ecological environment of the Yellow Sea and Bohai Sea. The satellite remote sensing inversion of this parameter is also of great significance to the study of ocean optical and water color remote sensing. Aiming at the relationship between particle size and remote sensing reflectivity of suspended particulates, the following works have been done in this paper: (1) using the measured optical data of 201405, 201411 and 201508, The inversion models of remote sensing reflectivity between single band or band ratio and particle size D25 / D50 and D75 are established based on GOCIMODIS and MERIS satellite bands, respectively. The inversion accuracy and sensitivity of the model are tested and the distribution of abnormal data is preliminarily analyzed. On the whole, the model based on GOCII MODIS satellite band setting is superior to MERIS, and the inverse D25 Dso model is superior to D75 model. (2) based on the GOCI satellite monthly composite data, the particle size space-time distribution map is inversed, and the precision of the inversion data and the measured data is obtained. The results show that the inversion error of the three particle sizes in the low value region and the high value region is large, and the inversion error of the middle part is small. The change of particle size and particle size from coastal to deep sea gradually increased, the particle size in the first half of the year was lower than that in the second half, and the change was small in the last three years. (3) based on the measured data, the volume concentration and particle number concentration of suspended particles were studied. The relationship between the optical parameters such as particle size and intrinsic optical parameters (mainly attenuation coefficient and backscattering coefficient of particles), the spectral modeling of the parameters and the applicability of the model are discussed. The results show that the backscattering coefficient of suspended particles has a good correlation with the optical parameters, the attenuation coefficient has a better correlation with the volume concentration and the particle number concentration, and the correlation with the particle size is poor.
【學位授予單位】：南京信息工程大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：P715.7;P734.2
本文編號：2170242
[Abstract]:The particle size of suspended particles is an important optical parameter of the ocean, which plays an important role in the biological and chemical processes in the Yellow Sea and Bohai Sea, where suspended particulates are the main ones. The study of its content and distribution is helpful to the understanding of the ecological environment of the Yellow Sea and Bohai Sea. The satellite remote sensing inversion of this parameter is also of great significance to the study of ocean optical and water color remote sensing. Aiming at the relationship between particle size and remote sensing reflectivity of suspended particulates, the following works have been done in this paper: (1) using the measured optical data of 201405, 201411 and 201508, The inversion models of remote sensing reflectivity between single band or band ratio and particle size D25 / D50 and D75 are established based on GOCIMODIS and MERIS satellite bands, respectively. The inversion accuracy and sensitivity of the model are tested and the distribution of abnormal data is preliminarily analyzed. On the whole, the model based on GOCII MODIS satellite band setting is superior to MERIS, and the inverse D25 Dso model is superior to D75 model. (2) based on the GOCI satellite monthly composite data, the particle size space-time distribution map is inversed, and the precision of the inversion data and the measured data is obtained. The results show that the inversion error of the three particle sizes in the low value region and the high value region is large, and the inversion error of the middle part is small. The change of particle size and particle size from coastal to deep sea gradually increased, the particle size in the first half of the year was lower than that in the second half, and the change was small in the last three years. (3) based on the measured data, the volume concentration and particle number concentration of suspended particles were studied. The relationship between the optical parameters such as particle size and intrinsic optical parameters (mainly attenuation coefficient and backscattering coefficient of particles), the spectral modeling of the parameters and the applicability of the model are discussed. The results show that the backscattering coefficient of suspended particles has a good correlation with the optical parameters, the attenuation coefficient has a better correlation with the volume concentration and the particle number concentration, and the correlation with the particle size is poor.
【學位授予單位】：南京信息工程大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：P715.7;P734.2
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