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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Seasonal and regional differentiation of bio-optical properties within the north polar Atlantic
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Seasonal and regional differentiation of bio-optical properties within the north polar Atlantic

机译：北极北极地区生物光学特性的季节性和区域差异

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Using field data from the north polar Atlantic, we examined seasonal variability of the spectral absorption, a(λ), and backscattering, b b(λ), coefficients of surface waters in relation to phytoplankton pigments. For a given chlorophyll a concentration, the concentrations of accessory pigments were lower in spring than in summer. This effect contributed to lower chlorophyll-specific absorption of phytoplankton and total particulate matter in spring. The spring values of the green-to-blue band ratio of a(λ) were higher than the summer ratios. The blue-to-green ratios of b b(λ) were also higher in spring. The higher b b values and lower blue-to-green b b ratios in summer were likely associated with higher concentrations of detrital particles in summer compared to spring. Because the product of these band ratios of a and b b is a proxy for the blue-to-green ratio of remote-sensing reflectance, the performance of ocean color band-ratio algorithms for estimating pigments is significantly affected by seasonal shifts in the relationships between absorption, backscattering, and chlorophyll a. Our results suggest that the algorithm for the spring season would predict chlorophyll a that is higher by as much as a factor of 4–6 compared to that predicted from the summer algorithm. This indicates a need for a seasonal approach in the north polar Atlantic. However, we also found that a fairly good estimate of the particulate beam attenuation coefficient at 660 nm (a proxy for total particulate matter or particulate organic carbon concentration) can be obtained by applying a single blue-to-green band-ratio algorithm regardless of the season.
机译：使用来自北极北极的野外数据，我们研究了与浮游植物色素有关的地表水的光谱吸收系数a（λ）和反向散射系数bb（λ）的季节性变化。对于给定的叶绿素a浓度，春季辅助色素的浓度低于夏季。这种作用有助于降低春季浮游植物和总颗粒物的叶绿素特异性吸收。 a（λ）的绿蓝带比率的春季值高于夏季比率。在春季，b b（λ）的蓝绿比也更高。与春季相比，夏季较高的b b值和较低的蓝绿色b b比值可能与夏季较高的碎屑颗粒浓度有关。由于a和bb的这些带比率的乘积是遥感反射的蓝绿色比率的代理，因此海洋色带比率算法用于估计颜料的性能受到以下关系之间的季节性变化的显着影响吸收，反向散射和叶绿素a。我们的结果表明，与夏季算法相比，春季的算法预测的叶绿素a高4-6倍。这表明在北大西洋大西洋地区需要采取季节性措施。但是，我们还发现，无论采用何种蓝-绿带比例算法，都可以通过使用单个蓝-绿谱带比算法获得对660 nm处粒子束衰减系数的良好估计（代表总粒子物质或粒子有机碳浓度）。本赛季。

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