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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Comparison of Valid Ocean Observations Between MODIS Terra and Aqua Over the Global Oceans
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Comparison of Valid Ocean Observations Between MODIS Terra and Aqua Over the Global Oceans

机译：MODIS Terra和Aqua在全球海洋中有效海洋观测的比较

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摘要

Ocean color satellite missions to measure the biophysical and geochemical properties of the surface ocean need to consider not only the spectral and spatial requirements of the sensors but also the satellite overpass time to maximize valid observations. The valid observations are impacted not only by cloud cover but also by other perturbations such as sun glint and stray light. Using Level-3 global composites of three ocean products (chlorophyll a or Chl-a, normalized florescence line height or nFLH, and sea surface temperature or SST), the daily percentage valid observations (DPVOs) over the global oceans were calculated, from which the differences between MODIS Aqua (afternoon pass) and MODIS Terra (morning pass) have been analyzed. For all three products, Aqua shows more valid observations than Terra over the Southern Ocean, the ocean near Peru and Chile, and the ocean around Angola and Namibia, with relatively >30% more valid observations in boreal winter months due to lower cloud coverage in the afternoon. In contrast, more than 20% of valid Chl-a and nFLH observations are obtained by Terra in the North Indian Ocean, and 10%–30% more valid observations by Terra are also found for the Equatorial Pacific and Atlantic oceans. These can be possibly linked to the lower presence of sun glint for Terra. Compared with Chl-a and nFLH, SST retrievals are more tolerant to sun glint and other perturbation factors, leading to much higher DPVOs. The implications of these findings to future satellite mission design and field campaigns are also discussed.
机译：海洋彩色卫星任务用于测量表层海洋的生物物理和地球化学特性，不仅需要考虑传感器的光谱和空间要求，还需要考虑卫星的越过时间，以最大限度地提高有效观测值。有效观测不仅受到云层覆盖的影响，还受到其他干扰（例如太阳闪耀和杂散光）的影响。使用三种海洋产品（叶绿素a或Chl-a，归一化的花序线高或nFLH以及海面温度或SST）的Level-3全球合成，计算出全球海洋的每日有效观测百分比（DPVO），从中分析了MODIS Aqua（下午通行证）和MODIS Terra（早晨通行证）之间的区别。对于这三种产品，Aqua在南大洋，秘鲁和智利附近的海洋以及安哥拉和纳米比亚附近的海洋中显示的有效观测结果都比Terra更为有效，由于北半球的云层覆盖率较低，在冬季冬季，有效观测结果的相对而言要多出30％以上这个下午。相比之下，Terra在北印度洋获得了超过20％的有效Chl-a和nFLH观测结果，Terra在赤道太平洋和大西洋也获得了10％–30％的有效观测结果。这些可能与Terra较低的太阳闪光现象有关。与Chl-a和nFLH相比，SST取回更能容忍阳光和其他干扰因素，从而导致更高的DPVO。还讨论了这些发现对未来卫星任务设计和野战的意义。

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