Sinking particles between the equatorial and subarctic regions (0°N-46°N) in the central Pacific
Sinking particles between the equatorial and subarctic regions (0°N-46°N) in the central Pacific
复制标题
太平洋中部赤道和亚北极地区 (0°N-46°N) 之间的下沉颗粒
DOI：
10.2343/geochemj.32.125
复制
发表时间：
1998
影响因子：
0.8
通讯作者：
Hidekazu Ohta
中科院分区：
文献类型：
--
作者：
H. Kawahata;A. Suzuki;Hidekazu Ohta
下沉颗粒在大气中二氧化碳向深海的转移中起着重要作用。我们在太平洋中部从0°N到46°N的175°E的样带上部署了6个沉积物捕集器系泊。沿样带的平均有机质通量一般反映初级生产力。平均蛋白石通量在34°N和46°N之间有明显增加。平均总通量的增加伴随着有机质和蛋白石通量的增加。从赤道到亚北极，碳酸盐含量总体呈下降趋势。蛋白石/碳酸盐比值从中高纬度逐渐增加。这些趋势基本上与上层海洋普遍存在的浮游生物群落结构相一致。在高纬度地区，硅藻比钙质纳米浮游生物和有孔虫占优势。175°E海域浮游生物群落丰富，沉降颗粒的C/N原子比变化范围较小（6.0 ~ 8.7）。晚春期间中太平洋中纬度地表水CO2分压降低的潜在原因是有机碳输出通量高和下沉颗粒中CO2 /Ccarbonate比值高。
Sinking particles play an important role in the transfer of atmospheric CO2 into the deep sea. We deployed six moorings of sediment traps across the transect at 175°E from 0°N to 46°N in the central Pacific. Mean organic matter fluxes along the transect generally reflected primary productivity. Mean opal fluxes showed similar profile, but increased markedly between 34°N and 46°N. The increase in mean total fluxes was accompanied with the increase in fluxes of organic matter and opal. Carbonate contents generally decreased from the equatorial to the subarctic regions. The opal/carbonate ratios increased from mid to high latitudes. These trends are essentially compatible with the prevalent plankton community structure in the upper ocean. Diatoms predominate over calcareous nannoplankton and foraminifera in higher latitudes. In spite of different plankton communities flourishing along the 175°E, C/N atomic ratios of sinking particles varied within a small range (6.0-8.7). The high export flux of organic carbon and high Corg/Ccarbonate ratio in sinking particles were potentially responsible for diminished partial pressure of CO2 in surface water in the middle latitudes of the central Pacific during late spring.