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Decadal trends in global pelagic ocean chlorophyll: A new assessment integrating multiple satellites in situ data and models

机译:全球中上层海洋叶绿素的年代际变化趋势:一项结合多颗卫星原位数据和模型的新评估

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摘要

Quantifying change in ocean biology using satellites is a major scientific objective. We document trends globally for the period 1998–2012 by integrating three diverse methodologies: ocean color data from multiple satellites, bias correction methods based on in situ data, and data assimilation to provide a consistent and complete global representation free of sampling biases. The results indicated no significant trend in global pelagic ocean chlorophyll over the 15 year data record. These results were consistent with previous findings that were based on the first 6 years and first 10 years of the SeaWiFS mission. However, all of the Northern Hemisphere basins (north of 10° latitude), as well as the Equatorial Indian basin, exhibited significant declines in chlorophyll. Trend maps showed the local trends and their change in percent per year. These trend maps were compared with several other previous efforts using only a single sensor (SeaWiFS) and more limited time series, showing remarkable consistency. These results suggested the present effort provides a path forward to quantifying global ocean trends using multiple satellite missions, which is essential if we are to understand the state, variability, and possible changes in the global oceans over longer time scales.
机译:使用卫星量化海洋生物学的变化是一项主要的科学目标。通过整合三种不同的方法,我们记录了1998-2012年期间的全球趋势:来自多个卫星的海洋颜色数据,基于原位数据的偏差校正方法以及数据同化以提供一致且完整的全球表示,而没有取样偏差。结果表明,在15年的数据记录中,全球中上层海洋叶绿素没有显着趋势。这些结果与以前基于SeaWiFS任务的前6年和前10年的发现相一致。但是,所有北半球盆地(北纬10°以北)以及赤道印度洋盆地的叶绿素均显着下降。趋势图显示了本地趋势及其每年的百分比变化。这些趋势图与仅使用单个传感器(SeaWiFS)和更有限的时间序列的其他先前工作进行了比较,显示出显着的一致性。这些结果表明,目前的工作为使用多个卫星任务量化全球海洋趋势提供了一条途径,这对于我们要了解更长时期内全球海洋的状态,可变性和可能的​​变化至关重要。

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