Corrections to the MODIS Aqua Calibration Derived From MODIS Aqua Ocean Color Products
Corrections to the MODIS Aqua Calibration Derived From MODIS Aqua Ocean Color Products
复制标题
对源自 MODIS Aqua 海洋颜色产品的 MODIS Aqua 校准的更正
DOI：
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复制
发表时间：
2014
影响因子：
8.2
通讯作者：
B. Franz
中科院分区：
文献类型：
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作者：
G. Meister;B. Franz
海洋颜色的产物，例如叶绿素-a浓度，可以从地球轨道卫星上的成像传感器测量的大气顶部辐射中得出。目前在轨道上有三个国家航空航天局的传感器能够提供海洋颜色的产品。其中一种传感器是Aqua卫星上的中分辨率成像光谱仪（MODIS），其海洋色产品是目前三者中使用最广泛的。MODIS的校正方法最近有所改进，利用陆地目标来提高校正精度。本研究评估了新的校准方法，并描述了建立在新方法基础上的进一步校准改进，包括以全球时间平均离水反射率测量形式进行的海洋测量。本文提出的校准改进主要是修改扫描边缘的校准，利用了扫描中心的陆地目标趋势的良好性能。
Ocean color products such as, e.g., chlorophyll-a concentration, can be derived from the top-of-atmosphere radiances measured by imaging sensors on earth-orbiting satellites. There are currently three National Aeronautics and Space Administration sensors in orbit capable of providing ocean color products. One of these sensors is the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite, whose ocean color products are currently the most widely used of the three. A recent improvement to the MODIS calibration methodology has used land targets to improve the calibration accuracy. This study evaluates the new calibration methodology and describes further calibration improvements that are built upon the new methodology by including ocean measurements in the form of global temporally averaged water-leaving reflectance measurements. The calibration improvements presented here mainly modify the calibration at the scan edges, taking advantage of the good performance of the land target trending in the center of the scan.