Influence of bloom dynamics on Particle Export Efficiency in the North Atlantic: a comparative study of radioanalytical techniques and sediment traps
Influence of bloom dynamics on Particle Export Efficiency in the North Atlantic: a comparative study of radioanalytical techniques and sediment traps
复制标题
DOI：
10.1016/j.marchem.2016.10.001
复制
发表时间：
2016-11
期刊：
影响因子：
3
通讯作者：
E. Ceballos-Romero;F. L. Moigne;S. Henson;C. Marsay;R. Sanders;R. García‐Tenorio;M. Villa-Alfageme
中科院分区：
文献类型：
--
作者：
E. Ceballos-Romero;F. L. Moigne;S. Henson;C. Marsay;R. Sanders;R. García‐Tenorio;M. Villa-Alfageme
生物碳泵是全球碳循环（BCP）的重要组成部分。颗粒输出效率（PEeff）被定义为初级产品（PP）作为颗粒有机碳（POC）从海洋表面输出的比例，越来越多地被用作BCP强度的度量标准。然而，我们对哪些因素导致空气质量的可变性的认识仍然很差。这在一定程度上是因为在不同地区对peeffin进行比较时，常常忽略了所用方法与浮游生物繁殖阶段相关的时间尺度。在这里，我们使用三种技术来估计北大西洋的peeffin原位：放射性对238u -234和210pb - 210po，以及中性浮力沉积物捕集器（PELAGRA）。从PELAGRA获得的peeffer值与应用两种放射性核素技术获得的peeffer值之间的数量级差异。POC输出通量和卫星获得的PP表明，这是由于三种方法覆盖的不同时间尺度和相对于水华峰值的观测时间造成的。这三种技术都不适合用于原位估算，但必须考虑与特定采样方法操作的持续时间有关的水华动态。我们的研究结果表明，peeff具有很强的季节变化，很可能受群落结构和水文条件的控制。这意味着必须仔细考虑所使用的方法（特别是其固有的时间尺度）和采样时的水华阶段，以确保从不同来源编译的个体peeff估计用于构建全局导出算法具有可比性。
The Biological Carbon Pump is an important component of the global carbon cycle is (BCP). Particle Export Efficiency (PEeff), defined as the proportion of primary production (PP) exported as Particulate Organic Carbon (POC) from the surface ocean, is increasingly used as a metric of the strength of the BCP. However our knowledge of which factors drive variability ofPEeffremains poor. This is partially because comparisons ofPEeffin different regions often overlook the timescale over which the method used operates in relation to the phase of the plankton bloom. Here we use three techniques to estimatePEeffin situ in the North Atlantic: the radioactive pairs238U-234Th and210Pb-210Po, and neutrally buoyant sediment traps (PELAGRA).Order of magnitude discrepancies between values ofPEeffobtained from PELAGRA relative to those obtained when applying both radionuclide techniques. POC export fluxes and satellite-derived PP suggest that this results from the differing time scales covered by the three methods and the timing of observations relative to the bloom peak. None of the three techniques are considered inappropriate to estimatePEeffin situ, but bloom dynamics must be considered in relation to the duration over which a particular sampling method operates.Our results suggest a strong seasonal variability inPEeff, most likely controlled by the community structure and hydrographic conditions. This implies that the methods used (specifically their inherent timescales) and the phase of the bloom at the time of sampling must be carefully taken into account to ensure that individualPEeffestimates compiled from different sources to construct global export algorithms are comparable.