發(fā)布時間：2018-04-08 07:31

  本文選題：渤海海冰　切入點：ASD　出處：《中國海洋大學(xué)》2014年碩士論文

【摘要】：本文利用美國NOAA/AVHRR所提供的可見光遙感數(shù)據(jù)，對渤海海冰密集度反演算法進行了試驗研究，提出改進的海冰密集度反演算法，提取了渤海海冰參數(shù)年際時間序列，以此為基礎(chǔ)對前期太平洋海表面溫度變化與渤海海冰變化之間的關(guān)系進行分析研究。 本文采用ASD實測光譜數(shù)據(jù)，在分析其光譜特征的基礎(chǔ)上，確定出合適閾值用于海冰密集度的AVHRR反演算法；實現(xiàn)了基于30m空間分辨率的LandSat5-TM數(shù)據(jù)的渤海海冰密集度場反演，并利用該結(jié)果與單通道算法和LSMM模型多通道算法反演AVHRR數(shù)據(jù)渤海海冰密集度結(jié)果進行比對分析，進行了一系列通道算法試驗。誤差分析結(jié)果表明，基于LSMM模型的1245四通道所反演出的海冰密集度結(jié)果，誤差最小。在分析海冰和海水光譜分布特征的基礎(chǔ)上，本文提出了一種針對渤海海區(qū)的基于冰水識別判據(jù)的海冰密集度雙線性插值算法，將反演結(jié)果與LandSat衛(wèi)星比較并進行了誤差分析，該算法仍有待進一步改進。 建立了渤海海冰年際最大覆蓋范圍和面積的時間序列，對原有時間序列進行了補充，基于此分析了前期北太平洋海表面變化與渤海海冰之間的相關(guān)關(guān)系；在分析北太平洋海溫年際變化的基礎(chǔ)上，對前期海表面溫度變化與渤海海冰之間的相關(guān)關(guān)系進行了研究，結(jié)果表明前期8月的北太平洋海溫與后期的渤海海冰存在著較為顯著的相關(guān)關(guān)系，正相關(guān)區(qū)位于西風(fēng)漂流區(qū)范圍，負(fù)相關(guān)區(qū)位于黑潮和暖池海區(qū)以及赤道中東太平洋；分析了對渤海海冰影響較大的1月500hpa位勢高度場與前期8月和同期1月的西風(fēng)漂流區(qū)及赤道中東太平洋相關(guān)區(qū)的海溫相關(guān)關(guān)系，同時對相關(guān)區(qū)內(nèi)海溫的自相關(guān)變化進行分析，，討論了西風(fēng)漂流相關(guān)區(qū)內(nèi)海溫的韻律過程。結(jié)果表明，西風(fēng)漂流區(qū)內(nèi)海溫的韻律過程存在著時空差異;其相關(guān)區(qū)6-9月的海溫都可能通過韻律過程影響到翌年1-2月的冬季海溫，進而影響到渤海海冰的變化。
[Abstract]:In this paper, using optical remote sensing data provided by the United States NOAA/AVHRR, the Bohai sea ice concentration inversion algorithm is studied, the sea ice concentration inversion algorithm is improved, the extraction parameters of Bohai sea ice interannual time series, based on the relationship between the Pacific sea surface temperature and sea ice in the Bohai sea change were analyzed.
This paper uses ASD measured spectral data, based on the analysis of their spectral characteristics, determine a suitable threshold for sea ice concentration AVHRR inversion algorithm; the realization of the LandSat5-TM data of 30m spatial resolution of the Bohai sea ice concentration field inversion based on the analysis and comparison of the results with the use of single channel algorithm and LSMM model of multi channel inversion algorithm the AVHRR data of the Bohai sea ice concentration results, carried out a series of channel algorithm test. The error analysis shows that 1245 of the four channel LSMM model based on the inversion results of ice concentration, minimum error. Based on the analysis of sea ice and sea water spectra, this paper puts forward a kind of sea ice concentration in Bohai the bilinear interpolation algorithm based on the criterion of recognition of ice water, the inversion results with the LandSat satellite comparison and the error analysis of the algorithm remains to be further modified Into.
The establishment of the time series of sea ice in the Bohai sea area and annual maximum coverage, the original time series were added, based on the analysis of the relationship between the North Pacific sea surface changes and the Bohai sea; based on the analysis of the North Pacific SST interannual changes, the relationship between the sea surface temperature and sea ice changes in Bohai the research results show that in early August, the North Pacific SST and later the Bohai sea has significant correlation, positive correlation area is located in the west wind drift area, negative correlation area is located in the Black Sea and tide and warm pool in the eastern equatorial Pacific SST; analysis of the correlation between larger January 500hPa geopotential height field and the early August over the same period of January and impact on the Bohai Sea region and west wind drift in the eastern equatorial Pacific related area, at the same time the region variable autocorrelation SST This paper analyzed the process of the west wind drift area rhythm related SST. The results show that the spatial and temporal differences in the SST in west wind drift region of rhythm; the area of 6-9 months SST are possible through the process that affects the rhythm of 1-2 months of winter SST, and affect the change of the Bohai sea.

【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P731.15;P731.11

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