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Chlorophyll-a transformations associated with sinking diatoms during termination of a North Atlantic spring bloom

机译：北大西洋春季开花终止期间与沉没的硅藻有关的叶绿素-a转化

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A research cruise in the North Atlantic during the annual diatom bloom provided an ideal platform to study chlorophyll-a (chl-a) transformations associated with a large scale diatom bloom and export below the photic zone. On one deployment. Lagrangian sediment traps captured a significant flux of aggregated diatom cells produced during the termination of the main bloom, We examined the distribution of chl-a transformation products in sinking particles from the sediment traps and in suspended particles from the water column using highresolution HPLC with multistage mass spectrometry (LC-MSn). There was a dramatic change in the distribution of chl-a and its transformation products between the pre-sinking period, when the average chl-a concentration integrated over the upper 50 m was 68 +/- 36 mg m(-2), and the post-sinking period, when it was 30 +/- 11 mg m(-2). Before the diatom bloom left the euphotic zone (pre-sinking), suspended particles contained a considerably higher percentage of pheophorbide-a and other chl-a transformation products (27%) than during the postsinking period (10%). Despite high levels of spatial variability in the chl-a concentration, and despite sampling from both within and outside a main bloom patch, the chl-a transformation products in suspended particles did not exhibit spatial variability. Sinking particles associated with the diatom bloom export had low POC:chl-a ratios (52-97), suggesting undegraded phytoplankton cells. However, the samples with especially low POC:chl-a ratios exhibited similar distributions of chl-a transformation products to those with a higher ratio. The proportions of demetalated and de-esterified transformation products increased with depth of suspended particles, although significant levels of these products were also found in the uppermost 20 m during the bloom. This suggests processes in both surface waters and through the water column led to the formation of these products. (C) 2015 Elsevier B.V. All rights reserved.
机译：在年度硅藻绽放期间在北大西洋进行的一次研究航行提供了一个理想的平台，用于研究与大规模硅藻绽放相关的叶绿素-a（chl-a）转化以及在光化带以下的出口。一次部署。拉格朗日沉积物捕集阱捕获了在主要水华终止期间产生的大量聚集硅藻细胞通量，我们使用高分辨率HPLC和多级色谱法检查了沉积物捕集阱中沉颗粒和水柱悬浮颗粒中chl-a转化产物的分布质谱（LC-MSn）。在下沉期之间，当上半部50 m的平均chl-a浓度积分为68 +/- 36 mg m（-2）时，chl-a及其转化产物的分布发生了巨大变化。下沉后的时间为30 +/- 11 mg m（-2）。在硅藻绽放离开富营养区之前（下沉前），悬浮颗粒所含的脱镁叶绿酸-a和其他chl-a转化产物的比例（27％）要比后沉期间高得多（10％）。尽管在chl-a浓度中存在高水平的空间变异性，并且尽管从主要开花斑块的内部和外部都进行了采样，但悬浮颗粒中的chl-a转化产物仍未表现出空间变异性。与硅藻水华出口相关的下沉颗粒的POC：chl-a比率较低（52-97），表明浮游植物细胞未降解。但是，POC：chl-a比例特别低的样品显示出chl-a转化产物的分布与高比例的样品相似。脱金属和脱酯化的转化产物的比例随悬浮颗粒深度的增加而增加，尽管在开花期的最上层20 m也发现了这些产物的显着水平。这表明在地表水和通过水塔的过程都导致了这些产物的形成。 （C）2015 Elsevier B.V.保留所有权利。

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