Recent observations and numerical simulations have profoundly established that the C:N:P ratios in the ocean deviate from the canonical Redfield Ratio (106:16:1). Physical and biogeochemical processes have been hypothesized to be responsible for this deviation. However, a paucity of concurrent observations on biogeochemical and physical parameters have barred us to understand their exact role on the C:N:P ratios. For this purpose, we have sampled the Bay of Bengal for its C, N, and P contents in the organic and inorganic pools from 5 to 2000 m depth at eight stations (five coastal and three open ocean) during boreal spring 2019. Mesoscale anticyclonic eddies were identified at two of the sampling stations, where nutrient concentrations were lower in the top layer (5 m to the depth of chlorophyll maximum) compared to those at the non-eddy stations. Mean (NO₃⁻+NO₂⁻):PO₄³⁻ ratio was lower at the anticyclonic eddy stations compared to that at the non-eddy stations in the top layer. Yet C:N:P ratios in the particulate and dissolved organic matter in the top layer were the same at anticyclonic eddy and non-eddy stations. Overall the mean C:N:P ratios were 249:39:1 in particulate organic matter and 2338:146:1 in dissolved organic matter in the top layer. Biological N₂ fixation was not a driver in controlling the N:P ratio of the export flux and the subsurface water nutrient ratios during spring. Although the Bay of Bengal receives large riverine influx, its influence in changing the C:N:P ratios was small during this study.

最近的观察和数值模拟已经深刻地证实，海洋中的 C:N:P 比偏离了典型的红场比 (106:16:1)。已经假设物理和生物地球化学过程是造成这种偏差的原因。然而，由于缺乏对生物地球化学和物理参数的同时观察，我们无法了解它们对 C:N:P 比率的确切作用。为此，我们在 2019 年北方春季期间在 8 个站点（五个沿海和三个公海）从 5 到 2000 m 深度对孟加拉湾的有机和无机池中的 C、N 和 P 含量进行了采样。中尺度反气旋在两个采样站发现了涡流，与非涡流站相比，这些站的顶层（叶绿素最大深度 5 m）的养分浓度较低。₃ ^- +NO ₂ ^- ):PO ₄ ^3-比值在反气旋涡流站低于非涡流站。然而，在反气旋涡流站和非涡流站，上层颗粒物和溶解有机质的 C:N:P 比值是相同的。总体而言，顶层中颗粒有机物的平均 C:N:P 比为 249:39:1，溶解有机物的平均 C:N:P 比为 2338:146:1。生物 N ₂固定不是控制春季出口通量的 N:P 比率和地下水养分比率的驱动因素。尽管孟加拉湾接收了大量河流流入，但在本研究中其对 C:N:P 比率变化的影响很小。