Parameters that define the environmental variables, such as, phytoplankton biomass, chl-a, and nutrient concentration have been studied and analyzed during July 2017. During this study, vertical distribution of physico-chemical and water quality parameters has also been analyzed. Decrease in water temperature and dissolved oxygen from the surface to deep water up to the thermocline and oxycline were observed, which would be in relation to oxygen minimum zone. At the depth of 100 m, the concentration of chl-a is found high as compared to the surface water. The estimation of deep chlorophyll maximum has been chosen as a major investigation in this study. Moderate and high chl-a concentration (0.5-2.8 mg m^-3) regardless of less NO₃ flux (0.01-0.6 µM) have been recorded through in-situ and satellite observations. The concentration of SiO₄ (5-35 µM) is likely enhanced in the vertical and surface water productivity. Principal component analysis and multiple linear regressions were carried out in order to determine the difference of the variables between the surface and deep water.

中文翻译：

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在 CRV Sagar Purvi 上对印度泰米尔纳德邦海岸海水理化变化的观测

定义环境变量，例如，浮游植物生物量参数，chl-一个和营养浓度进行了研究，分析了2017年七月期间，在这项研究中，物理化学和水质参数的垂直分布也进行了分析。观察到水温和溶解氧从地表到深水直至温跃层和氧化跃层的降低，这与氧最低区有关。在 100 m 深处，发现chl- a的浓度高于地表水。深叶绿素最大值的估计已被选为本研究的主要调查。中高浓度的 chl- a (0.5-2.8 mg m ^-3 )，与 NO 少无关通过原位和卫星观测记录了_{3 个}通量 (0.01-0.6 µM) 。SiO ₄ (5-35 µM)的浓度可能会提高垂直和地表水生产力。进行主成分分析和多元线性回归，以确定表层水和深水之间变量的差异。