Trace element (TE) fluxes and their residence times (Fe, Mn, Cu, Pb, Cd, and V) within the surface ocean were determined along the GEOTRACES East Pacific Zonal Transect (GP16/EPZT) and found to reflect the diverse physical and geochemical conditions encountered across the track. The TE flux from atmospheric deposition, vertical mixing, and upwelling into the mixed layer and into the particle production zone (PPZ) along the GEOTRACES EPZT transect were evaluated with ⁷Be-based methods developed in earlier works. A horizontal input flux is driven from east to west by the South Equatorial Current (SEC), and estimated advection velocities were applied to horizontal gradients in the distributions of several TEs to approximate this term. There is a minimum in atmospheric deposition in the central gyre, with higher fluxes to the east due to large near-shore aerosol TE loadings, and higher to the west due to greater precipitation-driven deposition velocities (V_b). The ⁷Be-derived vertical diffusion (K_z) values range from 2.5 to 39 m²/d (0.29 × 10⁻⁴ to 4.5 × 10⁻⁴ m²/s) with higher values generally within the nearshore upwelling region and the lowest values within the stratified central gyre. Manganese displayed a well-defined gradient extending from the nearshore stations into the central gyre such that the advective term is a major component of the total input flux, particularly within the central gyre. Relative to other inputs the atmospheric input of soluble Mn is only of minor importance. Unlike Mn, there is no discernable horizontal gradient in the dissolved Fe data and therefore, there is no horizontal component of flux. Nearshore removal processes are more intense for dissolved Fe than for dissolved Mn and as a result, dissolved Mn remains elevated much farther offshore than does dissolved Fe. For the stratified mid-ocean gyre stations, the total input of Fe from all sources is relatively small compared to the inshore stations, and atmospheric deposition becomes the dominant mode of input. Aerosol Fe solubility determined by a 25% acetic acid leach with hydroxylamine hydrochloride was much greater than that derived from a leach using ultra-pure deionized water. This led to significant differences in the residence time of Fe calculated for the mid-ocean gyre using these different solubilities. Generally, each element displays relatively short (weeks–months) residence times within the nearshore region of robust upwelling, reflecting large input terms and rapid removal. Moving offshore, total input fluxes decrease and the residence times of the TEs increase markedly until the western edge of the transect. There, relaxation of ocean stratification permits greater upward turbulent flux and greater rainfall leads to greater atmospheric input of TEs.

沿着GEOTRACES东太平洋分区样带（GP16 / EPZT）确定了表层海洋中的痕量元素（TE）通量及其停留时间（Fe，Mn，Cu，Pb，Cd和V），并反映了不同的物理和整个轨道遇到的地球化学条件。的TE从大气沉积，垂直混合，并上升流通量到混合层并进入沿GEOTRACES EPZT样颗粒生产区（PPZ）中评估⁷在早期工作中开发的基于基础的方法。通过南赤道流（SEC）从东向西驱动水平输入通量，并将估计的对流速度应用于几个TE的分布中的水平梯度，以近似该项。中央回旋区的大气沉积量最小，由于较大的近岸气溶胶TE负荷，向东的通量较高，而由于降水驱动的沉积速度（V _b）较大，向西的通量较高。所述⁷是衍生垂直扩散（K _Ž）值的范围从2.5到39米² / d（0.29×10 ^-4〜4.5×10 ^-4 米²/ s），通常在近岸上升流区域具有较高的值，而在分层中央回旋管内则具有最低的值。锰表现出从近岸站到中央回旋区的明确定义的梯度，因此对流项是总输入通量的主要成分，特别是在中央回旋区内。相对于其他输入，可溶性Mn的大气输入仅次要重要性。与Mn不同，在溶解的Fe数据中没有可分辨的水平梯度，因此，没有磁通的水平分量。溶解的铁比溶解的Mn的近岸去除过程更强烈，因此，溶解的Mn的离岸距离比溶解的Fe保持更高。对于分层的中海回旋站，与近海站相比，来自所有来源的铁的总输入量相对较小，大气沉积成为主要的输入方式。用25％乙酸浸出液和盐酸羟胺测定的气溶胶Fe溶解度比使用超纯去离子水浸出时的溶解度大得多。这导致使用这些不同的溶解度计算出的中洋回旋中Fe的停留时间存在显着差异。通常，每个元素在强劲上升流的近岸区域内显示的停留时间相对较短（数周至数月），反映了大量的输入项和快速的清除。移至近海时，总输入通量减少，而TE的停留时间显着增加，直到样带的西边缘。那里，