Gregg Watson W, Rousseaux Cécile S
NASA Global Modeling and Assimilation Office Greenbelt, Maryland, USA.
NASA Global Modeling and Assimilation Office Greenbelt, Maryland, USA ; Universities Space Research Association Greenbelt, Maryland, USA.
J Geophys Res Oceans. 2014 Sep;119(9):5921-5933. doi: 10.1002/2014JC010158. Epub 2014 Sep 11.
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.
利用卫星量化海洋生物学变化是一项主要的科学目标。我们通过整合三种不同方法，记录了1998年至2012年全球范围内的趋势：来自多颗卫星的海洋颜色数据、基于现场数据的偏差校正方法以及数据同化，以提供一个无采样偏差的一致且完整的全球表征。结果表明，在15年的数据记录中，全球远洋海洋叶绿素没有显著趋势。这些结果与之前基于SeaWiFS任务前6年和前10年的研究结果一致。然而，所有北半球海域（北纬10°以北）以及赤道印度洋海域的叶绿素均显著下降。趋势图显示了局部趋势及其每年的变化百分比。这些趋势图与之前仅使用单个传感器（SeaWiFS）和更有限时间序列的其他几项研究进行了比较，显示出显著的一致性。这些结果表明，目前的工作为利用多颗卫星任务量化全球海洋趋势提供了一条前进的道路，如果我们要在更长的时间尺度上了解全球海洋的状态、变异性和可能的变化，这是必不可少的。
