【摘要】：采用靜止軌道海洋水色衛(wèi)星(GOCI)數(shù)據(jù)對(duì)長(zhǎng)江口及其鄰近海域有色溶解有機(jī)物(CDOM)反演。以QAA-CDOM算法為基礎(chǔ),根據(jù)實(shí)測(cè)數(shù)據(jù),利用BP神經(jīng)網(wǎng)絡(luò)模型來(lái)擬合QAA-CDOM算法中需要針對(duì)長(zhǎng)江口水體進(jìn)行優(yōu)化的懸浮顆粒后向散射系數(shù)bbp與吸收系數(shù)ap的關(guān)系,從而準(zhǔn)確估算CDOM的濃度。結(jié)果表明,反演結(jié)果準(zhǔn)確度較高,平均相對(duì)誤差為0.35�；贕OCI日內(nèi)連續(xù)成像的優(yōu)勢(shì),選取2014年3月15日8景GOCI影像,利用優(yōu)化后的QAA-CDOM-BP算法,對(duì)長(zhǎng)江口及其鄰近海域CDOM的日內(nèi)變化進(jìn)行反演和分析,得到的變化規(guī)律如下:長(zhǎng)江口及其鄰近海域的CDOM日變化主要受潮流、長(zhǎng)江徑流等共同影響。長(zhǎng)江口內(nèi)CDOM濃度在漲潮期高于退潮期,由于受長(zhǎng)江沖淡水的作用,CDOM從口外往外海區(qū)呈現(xiàn)逐漸遞減趨勢(shì)。
[Abstract]:The geostationary orbit ocean color satellite (GOCI) data are used to retrieve the colored dissolved organic matter (CDOM) in the Yangtze Estuary and its adjacent waters. Based on the QAA-CDOM algorithm and according to the measured data, the BP neural network model is used to fit the relationship between the backscattering coefficient (bbp) and the absorption coefficient (ap) of suspended particles which need to be optimized for the Yangtze Estuary water body in the QAA-CDOM algorithm. Thus, the concentration of CDOM is estimated accurately. The results show that the accuracy of the inversion results is high, and the average relative error is 0.35. Based on the advantage of GOCI intraday continuous imaging, 8 GOCI images of March 15, 2014 were selected, and the intra-day variation of CDOM in the Yangtze Estuary and its adjacent waters was inversed and analyzed by using the optimized QAA-CDOM-BP algorithm. The rule of variation is as follows: the daily variation of CDOM in the Yangtze Estuary and its adjacent waters is mainly influenced by tidal current and runoff of the Yangtze River. The concentration of CDOM in the estuary of the Yangtze River is higher than that in the ebb stage. Due to the effect of the fresh water from the Yangtze River, the concentration of CDOM decreases gradually from the mouth to the outer sea area.
【作者單位】： 浙江大學(xué)海洋學(xué)院海島海岸帶研究所;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目(41471346) 國(guó)家自然科學(xué)青年基金項(xiàng)目(41401404) 海洋公益性行業(yè)科研專(zhuān)項(xiàng)經(jīng)費(fèi)項(xiàng)目(201005030-06)
【分類(lèi)號(hào)】：P715.7;P734

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