利用AVHRR和MODIS数据测算海冰资源量——以渤海海冰资源测算为例

Calculating gross sea ice resource using AVHRR and MODIS data

论文探讨了利用遥感数据测算海冰资源量的方法,提出了基于GIS技术和光谱特征的海冰信息分层提取法,并测算出2001-01-15的渤海海冰资源储量和可开采量分别为8.19×109m3和4×1010m3,表明渤海海冰作为淡水资源,其数量是相当可观的。论文认为,利用可见光、近红外和远红外波段对海冰资源量测算效果明显;MODIS数据在海冰资源量测算方面优于AVHRR数据。

First,the methodology of using AVHRR and MODIS data to calculate gross sea ice resource has been discussed.Then,sea ice information extraction approach using the spectral information and GIS technique has been advanced.Based upon which,we calculated the area and the volume of sea ice resource on Jan.15and Feb.9,2001.It is also found out that the re-sults of using the bands of visible light,the near infrared and far infrared to calculate sea ice re-source are satisfactory.While calculating the depth of sea ice,it is unsatisfiedactory with the re-sult of using penetrating ability of the near infrared.MODIS data is better than AVHRR data in calculating gross sea ice resource.There are some important results including:(a)it is feasible to estimate the gross sea ice resource using NOAA/AVHRR and EOS/MODIS data.Because MODIS data is superior to AVHRR data in many ways such as spatial resolution and spectral resolution,the observation precision of using MODIS data is much better.Using the technology of delamination extraction,we can not only decrease the difficulty of extracting information on sea ice,but also increase the precision of extraction.(b)According to estimation,the amount of the available sea ice obtained is at least40billion cubic meters.Effective utilization of the re-source is very essential to the resolution of water scarcity problem and realization of sustainable development in Bohai Rim.(c)According to primary estimation,with the aid of industrialized technology,the available freshwater of the extracted sea ice will be over20billion stere during annual freezing season.In the light of reallocation of water resources,storage capacity of fresh-water cannot be increased.So,we should focus on improving storage technology of freshwater re-sources and pay attention to the study of new technology of exploiting sea ice so as to increase sea ice exploiting ability.