Depth profiles of suspended carbon and nitrogen along a North Pacific transect: Concentrations, isotopes, and ratios
Depth profiles of suspended carbon and nitrogen along a North Pacific transect: Concentrations, isotopes, and ratios
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DOI：
10.1002/lno.11989
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发表时间：
2021-11
影响因子：
4.5
通讯作者：
Sijia Dong;X. Wang;A. Subhas;F. Pavia;J. Adkins;W. Berelson
中科院分区：
文献类型：
--
作者：
Sijia Dong;X. Wang;A. Subhas;F. Pavia;J. Adkins;W. Berelson
本文报道了沿着北太平洋样带悬浮颗粒物的总颗粒碳（PC）、碳酸盐（PIC）、总颗粒氮（PN）、δ 13 C和δ 15 N的含量。在上层400米，悬浮PIC颗粒有机碳（POC）的比例一般遵循公布的下沉PIC/POC的比例。在600米以下，悬浮的PIC/POC变得明显低于下沉的PIC/POC，这可能表明悬浮物中的PIC溶解。在五个站点中的三个站点中，悬浮PN δ 15 N从真光层到温跃层随深度增加，与许多海洋区域（例如，蝙蝠和热）。然而，在遇到浮游植物水华的另外两个站中，在真光层中观察到高悬浮PN δ 15 N（高达12‰），这可能是由浮游植物水华期间低δ 15 N PN的输出造成的。Corg平均值：悬浮颗粒物氮比沿着样带为5.1 ± 0.2，其中副热带环流区（5.8 ± 0.3）略高于副北极环流区（4.6 ± 0.2）。
We present concentrations of total particulate carbon (PC), carbonate (PIC), total particulate nitrogen (PN), δ13C and δ15N 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 Corg : 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).