Subsurface algal blooms of the northwestern Arabian Sea
Subsurface algal blooms of the northwestern Arabian Sea
复制标题
DOI：
10.3354/meps11990
复制
发表时间：
2017-02-27
影响因子：
2.5
通讯作者：
Popova, Elena A.
中科院分区：
文献类型：
--
作者：
Piontkovski, Sergey A.;Queste, Bastien Y.;Popova, Elena A.
通过对浮游生物的现场采样，结合遥感和海洋海洋滑翔机的观测，可以深入了解冬季季风爆发的终止以及随后在阿拉伯海西北部演变成次表层荧光极大值的情况。这一次表层最大值逐渐下降，在春季季风季期间，在25至55米深的地方出现了增强的荧光。相对于水华，物种多样性在深荧光最大值范围内下降了一半。甲藻中的夜光藻以生物量为主，在所有样品中采集的次表层荧光最大。我们表明，次表层藻华持续了整个季风季，将西南和东北季风期间开始的藻华联系在一起。现场采样显示，夜光藻细胞大小净减少，表明向最大限度适应叶绿素的深层群落转变，但含有叶绿素的内源共生体没有任何增加。我们认为，浮游生物生物量和对阿拉伯海西北部生产力的估计比以前通过遥感观测估计的要大得多，这是因为深层叶绿素最大值的持久性、强度和垂直程度，而使用遥感手段只能估计，而不能测量。
In situ plankton sampling, combined with remotely sensed and ocean Seaglider observations, provided insight into the termination of the winter monsoon bloom and subsequent evolution into a subsurface fluorescence maximum in the northwestern Arabian Sea. This sub surface maximum gradually descended, presenting increased fluorescence between 25 and 55 m depth during the spring inter-monsoon season. Species diversity decreased by half within the deep fluorescence maximum relative to the bloom. The dinoflagellate Noctiluca scintillans dominated by biomass in all samples collected from the depth of the subsurface fluorescence maximum. We show that the subsurface algal bloom persists throughout inter-monsoon seasons, linking algal blooms initiated during the southwest and northeast monsoons. In situ samples showed a net decrease in Noctiluca cell size, illustrating a shift towards a deep chlorophyll maximum adapted community, but did not exhibit any increases in chlorophyll-containing endo symbionts. We propose that the plankton biomass and estimates of the northwestern Arabian Sea productivity are much greater than estimated previously through remote sensing observations, due to the persistence, intensity and vertical extent of the deep chlorophyll maximum whichusing remote means-can only be estimated, but not measured.