Variability in optical particle backscattering in contrasting bio‐optical oceanic regimes
Variability in optical particle backscattering in contrasting bio‐optical oceanic regimes
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DOI：
10.4319/lo.2011.56.3.0955
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发表时间：
2011-05
影响因子：
4.5
通讯作者：
D. Antoine;D. Siegel;T. Kostadinov;S. Maritorena;N. Nelson;B. Gentili;Vincenzo Vellucci;N. Guillocheau-N.
中科院分区：
文献类型：
--
作者：
D. Antoine;D. Siegel;T. Kostadinov;S. Maritorena;N. Nelson;B. Gentili;Vincenzo Vellucci;N. Guillocheau-N.
本文研究了两个站点（位于地中海西北部的BOUée pour l 'acquisition d' une Série Optique à Long泰尔梅站点和位于南加州外的圣巴巴拉海峡的Plumes和Blooms站点）的光学粒子后向散射系数（bbp）在大洋沃茨中的变化。来自这两个站点的数据跨越了两个bbp数量级，可能涵盖了典型的公海值。在442和555 nm波长处的bbp与叶绿素浓度之间存在显著的相关性。然而，这种关系中的大范围传播使得叶绿素成为bbp的不良预测因子。bbp和颗粒束在660 nm处的衰减系数之间的关系是更紧密的两个网站，表明确定这两个系数的粒径范围的协变性。对BBP与叶绿素关系的季节变化的详细研究表明，这种生物光学关系最好描述为一系列不同的状态，从一个状态快速过渡到另一个状态。后向散射比（B~bp; bbp与总颗粒散射的比，bp）的范围为约0.2%至1.5%，这与先前报道的值相似。B~bp与叶绿素的相关性不显著，而后向散射比的值则随光谱的变化而变化。
Variability in the optical particle backscattering coefficient (bbp) is investigated in oceanic waters from two sites, namely the BOUée pour l'acquiSition d'une Série Optique à Long termE site in the northwestern Mediterranean Sea and the Plumes and Blooms stations in the Santa Barbara Channel off Southern California. Data from these two sites span two orders of magnitude in bbp and likely cover typical open ocean values. A significant relationship is found between bbp at wavelengths of 442 and 555 nm and chlorophyll concentration. However the large spread in this relationship makes chlorophyll a poor predictor of bbp. The relationship between bbp and the particulate beam attenuation coefficient at 660 nm is tighter for both sites, indicating covariability of the particle size ranges that determine both coefficients. A detailed study of the seasonal changes of the bbp vs. chlorophyll relationship reveals that this bio‐optical relationship might be best described as a succession of distinct regimes with rapid transitions from one to another. The backscattering ratio (b~bp; the ratio of bbp to total particulate scattering, bp) ranges from about 0.2% to 1.5%, which is similar to previously reported values. The relationship between b~bp and chlorophyll was not significant, while values of the backscattering ratio varied spectrally.