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首页> 外文期刊>Estuarine Coastal and Shelf Science >Characterizing the vertical phytoplankton distribution in the Philippine Sea off the northeastern coast of Luzon
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Characterizing the vertical phytoplankton distribution in the Philippine Sea off the northeastern coast of Luzon

机译：在吕宋岛东北海岸的菲律宾海中的垂直浮游植物分布

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The vertical distribution of phytoplankton in the open ocean shows an increase in biomass at a depth referred to as the Subsurface Chlorophyll Maximum (SCM) that contributes significantly to the primary production of the water column. Hence, it is important to understand the dynamics that lead its formation and maintenance. This study examines the SCM in the Philippine Sea off the northeast coast of Luzon, utilizing bio-optical and empirical phytoplankton data from two oceanographic cruises conducted northeast of the island of Luzon in May/June 2011 and April/May 2012. Chlorophyll (Chl) profiles were converted to smoothed chlorophyll functions by using a b-spline basis. In 2011, the mean SCM depth was 97.24 m ? 22.33 m with mean SCM concentration of 0.43 ?g/ L ? 0.09 ?g/L while in 2012, mean SCM was deeper at 115.45 m ? 24.25 m and mean SCM concentration of 0.31 ? 0.09 ?g/L. Functional principal component analysis showed that the first principal component (PC) explained variability in the SCM depth, the second PC showed variability in the magnitude of the SCM concentration while the third PC accounted for the presence of multiple peaks. K-means clustering using the principal components resulted in three clusters which represented the offshore stations with the deepest SCM, stations within an observed cyclonic eddy with intermediate SCM and stations with coastal and shelf waters showing shallow SCM. Correlation analyses between Chl and physico-chemical and bio-optical parameters showed that Chl was positively correlated to beam attenuation, a bio-optical property that has been used as an alternative proxy for phytoplankton. This suggests that the observed SCMs represent actual increase in phytoplankton biomass. When the influence of the Kuroshio recirculation gyre was dominant in 2011, cooler temperature in surface waters was seen to significantly increase surface Chl. In 2012, highly saline waters from the tropical North Equatorial Current (NEC) waters appeared to lower the Chl distribution, particularly at the SCM. Phytoplankton abundance was recorded to be higher at the SCM than the surface in both years. In 2011, different species of diatoms dominated all clusters, except at the SCM of the coastal and shelf cluster wherein the dinoflagellate Gyrodinium grossestriatum was dominant. Most dominant species from 2011 were conspicuously absent in 2012 and there was a shift to the diatoms Fragilariopsis (surface), Thalassiosira and Rhizosolenia spp. in all clusters. These provide new insights on the phytoplankton community in relation to the changes in the oceanic circulation from subtropical North Pacific water in 2011 to tropical NEC water in 2012.
机译：开阔海洋植物植物的垂直分布显示了生物量的增加，深度被称为地下叶绿素最大（SCM），这对水柱的主要生产有贡献。因此，了解导致其形成和维护的动态非常重要。本研究审查了瑞典东北沿岸的菲律宾海中的SCM，利用来自两个海洋游轮的生物光学和经验丰富的浮游植物，从2011年5月/ 6月和2012年5月/ 5月/ 5月/ 5月浏览了吕宋岛东北部。叶绿素（CHL）通过使用B样条依据转化为平滑叶绿素功能的型材。 2011年，平均SCM深度为97.24米？ 22.33 m，平均scm浓度为0.43Ω·克/升？ 0.09？G / L在2012年，平均SCM在115.45米处更深？ 24.25 m，平均scm浓度为0.31？ 0.09？g / l。功能主成分分析表明，第一主成分（PC）在SCM深度中解释了可变性，第二PC在SCM浓度的幅度下显示了可变性，而第三PC占多峰的存在。 k-mears使用主要成分的聚类导致三个集群代表了具有最深SCM的海上车站，观察到的循环涡流内的车站，中间SCM和带有沿海和货架水的车站，显示浅SCM。 CHL和物理化学和生物光学参数之间的相关分析表明，CHL与光束衰减呈正相关，生物光学性质被用作浮游植物的替代代理。这表明观察到的SCM代表了浮游植物生物质的实际增加。当KuroshiO再循环陀螺仪的影响在2011年占主导地位时，表面水处的冷却温度显着增加表面CHL。 2012年，来自热带北赤道电流（NEC）水域的高盐水水似乎降低了CHL分布，特别是在SCM。在SCM的植物上被记录为比表面的表面更高。 2011年，不同种类的硅藻占主导地位的沿海和架子簇的SCM，其中indoflagelate吡哆醇Grossestiatum是显性的。 2011年从2011年显着缺席的大多数占优势物种，达斯多斯浮石（表面），Thalassiosira和rhizosolenia SPP转向。在所有集群中。这些对2011年到2012年热带NEC水的亚热带北太平洋的海洋循环变化有关浮游植物社区的新见解。

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