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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Integrated measurements of acoustical and optical thin layers II: Horizontal length scales
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Integrated measurements of acoustical and optical thin layers II: Horizontal length scales

机译：声学和光学薄层的集成测量II：水平长度刻度

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The degree of layered organization of planktonic organisms in coastal systems impacts trophic interactions, the vertical availability of nutrients, and many biological rate processes. While there is reasonable characterization of the vertical structure of these phenomena, the extent and horizontal length scale of variation has rarely been addressed. Here we extend the examination of the vertical scale in the first paper of the series to the horizontal scale with combined shipboard acoustic measurements and bio-optic measurements taken on an autonomous underwater vehicle. Measurements were made in Monterey Bay, CA from 2002 to 2008 for the bio-optical parameters and during 2006 for acoustic scattering measurements. The combined data set was used to evaluate the horizontal decorrelation length scales of the bio-optical and acoustic scattering layers themselves. Because biological layers are often decoupled from the physical structure of the water column, assessment of the variance within identified layers was appropriate. This differs from other studies in that physical parameters were not used as a basis for the layer definition. There was a significant diel pattern to the decorrelation length scale for acoustic layers with the more abundant nighttime layers showing less horizontal variability despite their smaller horizontal extent. A significant decrease in the decorrelation length scale was found in bio-optical parameters over six years of study, coinciding with a documented shift in the plankton community. Results highlight the importance of considering plankton behavior and time of day with respect to scale when studying layers, and the challenges of sampling these phenomena.
机译：沿海系统中浮游生物的分层组织程度会影响营养相互作用，养分的垂直可用性以及许多生物速率过程。虽然可以合理地表征这些现象的垂直结构，但很少解决变化的程度和水平长度尺度。在这里，我们将系列第一篇论文中垂直刻度的检查扩展到水平刻度，并结合了在自动水下航行器上进行的船上声学测量和生物光学测量。 2002年至2008年在加利福尼亚州蒙特利湾进行了生物光学参数的测量，2006年进行了声散射测量。组合的数据集用于评估生物光学和声散射层本身的水平去相关长度尺度。由于生物层通常与水柱的物理结构脱钩，因此对确定的层内方差进行评估是合适的。这与其他研究不同之处在于，物理参数未用作层定义的基础。声学层的去相关长度尺度上存在显着的diel模式，夜间层越丰富，尽管水平范围较小，但水平可变性却越小。在过去的六年研究中，生物光学参数中的去相关长度尺度显着下降，这与浮游生物群落的变化有关。结果凸显了研究层时考虑浮游生物行为和一天中的时间比例的重要性，以及采样这些现象的挑战。

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