渤海海冰反演算法研究及其与北太平洋海表面温度的关系

发布时间：2018-04-08 07:31

本文选题：渤海海冰　切入点：ASD　出处：《中国海洋大学》2014年硕士论文

【摘要】：本文利用美国NOAA/AVHRR所提供的可见光遥感数据，对渤海海冰密集度反演算法进行了试验研究，提出改进的海冰密集度反演算法，提取了渤海海冰参数年际时间序列，以此为基础对前期太平洋海表面温度变化与渤海海冰变化之间的关系进行分析研究。本文采用ASD实测光谱数据，在分析其光谱特征的基础上，确定出合适阈值用于海冰密集度的AVHRR反演算法；实现了基于30m空间分辨率的LandSat5-TM数据的渤海海冰密集度场反演，并利用该结果与单通道算法和LSMM模型多通道算法反演AVHRR数据渤海海冰密集度结果进行比对分析，进行了一系列通道算法试验。误差分析结果表明，基于LSMM模型的1245四通道所反演出的海冰密集度结果，误差最小。在分析海冰和海水光谱分布特征的基础上，本文提出了一种针对渤海海区的基于冰水识别判据的海冰密集度双线性插值算法，将反演结果与LandSat卫星比较并进行了误差分析，该算法仍有待进一步改进。建立了渤海海冰年际最大覆盖范围和面积的时间序列，对原有时间序列进行了补充，基于此分析了前期北太平洋海表面变化与渤海海冰之间的相关关系；在分析北太平洋海温年际变化的基础上，对前期海表面温度变化与渤海海冰之间的相关关系进行了研究，结果表明前期8月的北太平洋海温与后期的渤海海冰存在着较为显著的相关关系，正相关区位于西风漂流区范围，负相关区位于黑潮和暖池海区以及赤道中东太平洋；分析了对渤海海冰影响较大的1月500hpa位势高度场与前期8月和同期1月的西风漂流区及赤道中东太平洋相关区的海温相关关系，同时对相关区内海温的自相关变化进行分析，，讨论了西风漂流相关区内海温的韵律过程。结果表明，西风漂流区内海温的韵律过程存在着时空差异;其相关区6-9月的海温都可能通过韵律过程影响到翌年1-2月的冬季海温，进而影响到渤海海冰的变化。
[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.

【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P731.15;P731.11

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