Retrieval of Arctic sea ice drift using HY-2 Satellite scanning microwave radiometer data
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摘要: 本文基于最大互相关法,利用海洋二号(HY-2)卫星扫描微波辐射计37 GHz通道多时相垂直极化亮温数据,获取了北极海冰漂移速度。采用2012年和2013年国际北极浮标计划海冰现场观测数据,对利用微波辐射计亮温资料反演的冬季北极海冰漂移速度进行了定量验证,结果表明:流速和流向均方根误差分别为1.12 cm/s和16.37°,从一定程度上说明了HY-2卫星扫描微波辐射计亮温数据反演海冰漂移速度的可行性。此外,使用美国国防气象卫星F-17搭载的专用微波成像仪91 GHz通道垂直极化亮温,采用高斯拉普拉斯滤波方法进行处理,结合最大互相关法反演的海冰漂移速度,优于法国海洋开发研究院海冰漂移速度产品。Abstract: In order to retrieve Arctic sea ice drift maps, the maximum cross correlation (MCC) method is applied to the 37 GHz vertically polarized brightness temperature data taken from the scanning microwave radiometer onboard the HY-2 Satellite of China. A validation of our sea-ice drift products during winters 2012 and 2013 with the IABP buoys shows a good accuracy, with the root mean square errors in ice drift speed and ice drift direction being 1.12 cm/s and 16.37°, respectively, thus demonstrating the practicability of the brightness temperature data from HY-2 Satellite scanning microwave radiometer in retrieving sea ice motion. Using the 91 GHz vertically polarized brightness temperature data from Special Sensor Microwave Imager/Sounder radiometers onboard the Defense Meteorological Satellite Program, and employing a Laplacian of the Gaussian filter, the sea ice drift production obtained by MCC method are found to be better in quality than those obtained by French Research Institute for Exploitation of the Sea.
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