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Bio-optical properties of coastal waters in the Eastern English Channel

机译：东英吉利海峡沿海水域的生物光学特性

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摘要

Strong tidal currents, shallow water and numerous freshwater inputs characterize the coastal waters of the eastern English Channel. These case 2 waters were investigated through an intensive sampling effort in 2000 aiming to study the distribution and variability of the Chromophoric Dissolved Organic Matter (CDOM), Non-Algal Particles (NAP) and phytoplankton absorption at the mesoscale. Four cruises were carried out in February, March, May and July and more than 80 stations each cruise were sampled for hydrographical, chemical and bio-optical analyses. Results showed two distinct situations, the winter period characterized by the strong dominance of CDOM absorption over the particulate matter, and the spring—summer period when phytoplankton and CDOM represented the same contribution. Meteorology was the main factor driving the bio-optical properties of the water column in winter whereas in spring—summer the biological activity seemed to be the more active driving force. The algal community composition in term of dominant cell size and, therefore pigment packaging, is the main factor driving the phytoplankton specific absorption in the water column. Photoprotective pigments did not significantly influence algal absorption, due to turbid and highly mixed water masses. This feature also explained the bio-optical homogeneity found along the water column. On the mesoscale, distinct bio-optical provinces were defined in relation with the observed bio-hydrographical variability.
机译：强烈的潮流，浅水和大量淡水输入是东部英吉利海峡沿海水域的特征。通过在2000年进行大量采样研究，对这2种水域进行了调查，目的是研究中尺度的发色溶解性有机物（CDOM），非藻类颗粒（NAP）和浮游植物吸收的分布和变异性。在2月，3月，5月和7月进行了4次巡游，每个巡游都采样了80多个站点，以进行水文，化学和生物光学分析。结果显示出两种截然不同的情况，冬季以CDOM在颗粒物上的吸收为主导，而春季至夏季则是浮游植物和CDOM贡献相同的时期。冬季，气象是驱动水柱生物光学特性的主要因素，而在春季（夏季），生物活性似乎是更活跃的驱动力。就主要细胞大小以及因此色素包装而言，藻类群落组成是驱动水柱中浮游植物特异性吸收的主要因素。由于浑浊和高度混合的水团，光保护性颜料不会显着影响藻类的吸收。此功能还解释了沿水柱发现的生物光学均匀性。在中尺度上，根据观测到的生物水文变异确定了不同的生物光学省份。

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