We present concentrations of total particulate carbon (PC), carbonate (PIC), total particulate nitrogen (PN), ¹³C and ¹⁵N of suspended particles along a North Pacific transect. In the upper 400 m, suspended PIC to particulate organic carbon (POC) ratios generally follow published sinking PIC/POC ratios. Below 600 m, suspended PIC/POC become significantly lower than sinking PIC/POC, likely indicating PIC dissolution within the suspended load. In three out of the five stations, suspended PN δ¹⁵N increase with depth from the euphotic zone to the thermocline, consistent with previous observations in many ocean regions (e.g.,BATS and HOT). However, in the other two stations where phytoplankton blooms were encountered, high suspended PN δ¹⁵N (up to 12‰) were observed in the euphotic zone, which was likely caused by the export of low-δ¹⁵N PN during the phytoplankton blooms. Average C_org : N ratio of suspended particles along the transect is 5.1 0.2, with the value in the subtropical gyre (5.8 0.3) slightly higher than the subarctic gyre (4.6 0.2).

中文翻译：

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北太平洋横断面悬浮碳和氮的深度剖面：浓度、同位素和比率

我们展示了沿北太平洋横断面的总颗粒碳 (PC)、碳酸盐 (PIC)、总颗粒氮 (PN)、¹³ C 和¹⁵ N 悬浮颗粒的浓度。在上部 400 m，悬浮 PIC 与颗粒有机碳 (POC) 的比率通常遵循公布的下沉 PIC/POC 比率。在 600 m 以下，悬浮的 PIC/POC 明显低于下沉的 PIC/POC，可能表明 PIC 在悬浮负载中溶解。在五个站点中的三个站点中，悬浮的 PN δ ¹⁵ N 随着从透光区到温跃层的深度而增加，这与许多海洋区域（例如，BATS 和 HOT）的先前观测结果一致。然而，在遇到浮游植物大量繁殖的其他两个站点，高悬浮 PN δ ¹⁵在透光区观察到N（高达12‰），这可能是由于浮游植物大量繁殖期间输出低δ ^{15 N PN造成的。} 沿样带的悬浮粒子平均C _org : N 比为5.1 0.2，亚热带环流（5.8 0.3）略高于亚北极环流（4.6 0.2）。