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    基于半分析算法的赤潮水體固有光學性質反演
    Retrieval of Oceanic Inherent Optical Properties Based on Semi-analyticl Algorithm during Red Ride
    投稿時間:2009-11-20  修訂日期:2010-11-29
    DOI:
    中文關鍵詞:  赤潮  固有光學參數  半分析算法  QAA算法
    英文關鍵詞:red tide  inherent optical properties  semi-analytical algorithm  Quasi-Analytical Algorithm
    基金項目:國家自然科學基金項目(40706060,60802089);國家高技術研究發展計劃“863”項目(2006AA09A310,2007AA092102)
    作者單位郵編
    郝艷玲 國家海洋局第一海洋研究所 266061
    摘要點擊次數: 3925
    全文下載次數: 465
    中文摘要:
          在珠江口海域海洋光學浮標實驗期間,獲取了赤潮生消過程的水體光學數據和相應的生化數據。本文利用該實驗數據開展了QAA(Quasi-Analytical Algorithm)算法反演赤潮水體固有光學參數的精度檢驗和模型修正工作。(1)利用遙感反射率rrs和QAA算法反演主要水色波段(412 nm, 443 nm, 490 nm、510 nm, 560nm, 620 nm和665nm)固有光學量發現:490nm-665nm波段水體總吸收系數at和顆粒物后向散射系數bbp的反演誤差優于25%,443nm波段at和bbp反演誤差在8-32%之間,412nm波段at和bbp反演誤差在31-57%之間。浮游植物吸收系數aph和黃色物質與碎屑吸收系數adg反演誤差分別在32-157%和59-80%之間。對比兩種參考波段(555nm和640nm)選取方式發現,除490nm和510nm外,QAA-640算法在其它波段的反演精度均優于QAA-555算法,其中412和443nm波段尤為明顯。(2)利用實測數據進行了QAA算法的修正:對于at和bbp,QAA-555修正算法的反演精度有不同程度的提高,誤差減小1-11%,QAA-640修正算法的反演精度在412nm、620nm和665nm波段有所提高;對于aph和adg,修正算法的反演精度沒有明顯改善。除412nm和443nm波段外,修正的QAA-555均優于修正的QAA-640。(3)利用現場實測at數據和QAA算法反演aph和adg,誤差均優于24%;算法的誤差敏感性分析發現,當at引入20%的誤差時,adg反演誤差波動不明顯(<33%),而aph在560-665nm波段反演誤差波動可達58-241%。
    英文摘要:
          In the optical buoy experiments in the Pearl River (Zhujiang) mouth regions, we obtained the time series of bio-optical data of red tide. By using these data, we carried out retrieving inherent optical parameters of red tide with semi-analytical algorithm, and testing, validating and modifying the model with in situ data. (1) In the retrieval of inherent optical properties at major satellite ocean color bands (412nm, 443nm, 490nm, 510nm, 560nm, 620nm and 665nm) with rrs and QAA (Quasi-Analytical Algorithm), the errors for total absorption coefficient at and particle backscattering coefficient bbp at 490nm-665nm are less than 25%. The errors for at and bbp at 443nm are about 8-32%, and about 31-57% at 412nm. The error ranges for phytoplankton pigment absorption aph, detritus and colored dissolved organic matter absorption adg are 32~157% and 59~80%, respectively. Comparison of retrieval result by the different reference wavelengths (555nm and 640nm) of QAA, it’s found that with the exception of 490 nm and 510 nm, QAA-640 performed better than QAA-555 at other bands, especially at 412 and 443 nm. (2) QAA is modified by in situ data. Modified QAA-555 model derived better at and bbp. The errors decrease by 1~11%. Modified QAA-640 returns better at and bbp at 412nm, 620nm and 665nm. For aph and adg, the accuracy of retrieval results has no significant improvement. With the exception of 412nm and 443 nm, modified QAA-555 is better than modified QAA-640. (3) We used QAA to retrieve aph and adg from in situ measured at, the errors are less than 24%; When added 20% errors to the in situ at, the retrieval error for adg has no significant changes(<33%), but the errors of aph fluctuate in the range of 58-241% at 560-665nm.
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