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首页> 外文期刊>Journal of oceanography >Station Papa Time Series: Insights into Ecosystem Dynamics
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Station Papa Time Series: Insights into Ecosystem Dynamics

机译：车站爸爸时间序列：对生态系统动力学的洞察

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The Northeast Pacific has one of the longest time series of any open ocean station, primarily as a result of the weathership station at Station P from the 1950s to 1981. This review summarizes our understanding of the plankton ecosystem for this station and examines interannual variability for the primary producers. The weathership era characterized a period of high temporal sampling resolution with a limited number of parameters being measured. In contrast, the post-weathership period focussed on seasonal sampling (usually three times per year), but a wider range of parameters were measured and sediment traps were deployed to estimate carbon and opal flux rates. The mixed layer depth is shallow compared to the Atlantic Ocean, ranging from 40 to 120 m in late summer and winter respectively. Nitrate, silicate and phosphate are saturating year round with only a few exceptions in the 1970s. Winter and summer Si:N ratios are the same (1.5:1). Ammonium and urea are 0.5 uM in winter and near detection limits (～0.1 uM) in late summer. Iron is limiting (～0.05 nM) in late spring and summer for the growth of large diatoms, but iron is co-limiting with irradiance in winter. Chlorophyll and primary productivity are low and show little seasonal variation (about 2 times). Summer chl is about 20 mg m?2 while primary productivity ranges from 400–850 mg C m?2d?1. The f-ratio of 0.25 does not vary with seasons and indicates that primary productivity is fueled by regenerated nitrogen (e.g. NH4 and urea). Small cells (<5 um) are normally abundant and they utilize regenerated nitrogen produced by the micrograzers; they do not appear to be Fe-limited, but rather controlled by the micrograzers. Shipboard carboy experiments indicate that large diatoms become dominant when iron is added. Therefore top down control is exerted by the micrograzers on the small cells, while there is bottom up control of the large phytoplankton due to low Fe concentrations.
机译：东北太平洋是所有开放海洋站中时间序列最长的序列之一，这主要是由于1950年代至1981年在P站的气象船站所致。本综述总结了我们对该站浮游生物生态系统的理解，并研究了该站的年际变化。主要生产者。风船时代的特点是时间采样分辨率高，测量的参数数量有限。相比之下，后风化时期集中于季节性采样（通常是每年三次），但测量的参数范围更广，并且沉积物陷阱被用来估算碳和蛋白石的通量率。与大西洋相比，混合层的深度较浅，夏末和冬季分别为40至120 m。硝酸盐，硅酸盐和磷酸盐全年都在饱和，1970年代只有少数例外。冬季和夏季的Si：N比率相同（1.5：1）。冬季氨和尿素为0.5 uM，夏末则接近检出限（〜0.1 uM）。对于大型硅藻的生长，铁限制在春末和夏末（〜0.05 nM），而铁则在冬天与辐照度共同限制。叶绿素和初级生产力较低，几乎没有季节性变化（约为2倍）。夏季的chl约为20 mg m？2，而初级生产力为400–850 mg C m？2d？1。 f比率0.25不会随季节变化，这表明主要生产力是由再生氮（例如NH4和尿素）提供的。小细胞（<5 um）通常很丰富，它们利用了微放牧者产生的再生氮。它们似乎不受铁的限制，而是由微放牧者控制。船上的水槽实验表明，添加铁后，大型硅藻将占主导地位。因此，通过微掠器对小细胞进行自上而下的控制，而由于低的铁浓度，对大浮游植物有自下而上的控制。

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