During the North Atlantic Bloom Experiment (NABE) of the Joint Global Ocean Flux Study (JGOFS), water column sampling for particulate and dissolved ²¹⁰Po and ²¹⁰Pb was performed four times (26 April and 4, 20, 30 May 1989) during a month-long Lagrangian time-series occupation of the NABE site, as well as one-time samplings at stations during transit to and from the site. There are few prior studies documenting short-term changes in ²¹⁰Po and ²¹⁰Pb profiles over the course of a phytoplankton bloom, and we interpret the profiles in terms of the classical “steady-state” (SS) approach used in most studies, as well as by using a non-steady state approach suggested by the temporal evolution of the profiles. Changes in ²¹⁰Po profiles during a bloom are expectable as this radionuclide is scavenged and exported. During NABE, ²¹⁰Pb profiles also displayed non-steady state, with significant increases in upper water column inventory occurring midway through the experiment. Export of ²¹⁰Po from the upper 150 m using the classic “steady-state” model shows increases from 0.5 ± 8.5 dpm m⁻² d⁻¹ to 68.2 ± 4.2 dpm m⁻² d⁻¹ over the ~one-month occupation. Application of a non-steady state model, including changes in both ²¹⁰Pb and ²¹⁰Po profiles, gives higher ²¹⁰Po export fluxes. Detailed depth profiles of particulate organic carbon (>0.8 μm) and particulate ²¹⁰Po (>0.4 μm) are available from the 20 and 30 May samplings and show maxima in POC/Po at ~37 m. Applying the POC/²¹⁰Po ratios at 150 m to the “steady state” ²¹⁰Po fluxes yields POC export from the upper 150 m of 8.2 ± 1.5 mmol C m^{− 2} d⁻¹ on 20 May and 6.0 ± 1.6 mmol C m⁻² d⁻¹ on 30 May. The non-steady state model applied to the interval 20 to 30 May yields POC export of 24.3 mmol C m⁻² d⁻¹. The non-steady state (NSS) ²¹⁰Po-derived POC fluxes are comparable to, but somewhat less than, those estimated previously from ²³⁴Th/²³⁸U disequilibrium for the same time interval (37.3 and 45.0 mmol m⁻² d⁻¹, depending on the POC/Th ratio used). In comparison, POC fluxes measured with a floating sediment trap deployed at 150 m from 20 to 30 May were 11.6 mmol m⁻² d⁻¹. These results suggest that non-steady state Po-derived POC fluxes during the NABE agree well with those derived from ²³⁴Th/²³⁸U disequilibrium and agree with sediment trap fluxes within a factor of ~2. However, unlike the ²³⁴Th-POC flux proxy, non-steady stage changes in profiles of ²¹⁰Pb, the precursor of ²¹⁰Po, must be considered.

在联合全球海洋通量研究（JGOFS）的北大西洋布卢姆实验（NABE ）期间，在1989年4月26日和4月20日，4月20日，1989年5月30日对水颗粒和溶解的²¹⁰ Po和²¹⁰ Pb进行了水柱采样NABE站点长达一个月的拉格朗日时间序列占用，以及往返站点期间在站点上的一次采样。先前的研究很少记录浮游植物开花过程中²¹⁰ Po和²¹⁰ Pb剖面的短期变化，并且我们根据大多数研究中使用的经典“稳态”（SS）方法来解释剖面，因为以及通过使用轮廓的时间演变所建议的非稳态方法。^210的变化由于这种放射性核素被清除并输出，因此预计在开花期间会产生Po分布。在NABE期间，²¹⁰ Pb剖面也显示出非稳态，实验中途发生的上部水柱存量显着增加。使用经典的“稳态”模型从上部150 m出口²¹⁰ Po表示在一个月的使用时间内从0.5±8.5 dpm m ^-2 d ^-1增加到68.2±4.2 dpm m ^-2 d ^-1。非稳态模型的应用（包括²¹⁰ Pb和²¹⁰ Po剖面的变化）给出了更高的²¹⁰宝出口通量。从5月20日和30日的采样中可以获得颗粒有机碳（> 0.8μm）和²¹⁰ Po（> 0.4μm）颗粒的详细深度剖面图，并显示了〜37 m处POC / Po的最大值。施加POC / ²¹⁰，在150米宝比到“稳定状态” ²¹⁰宝通量产量POC出口从8.2±1.5毫摩尔C M上150米^{- 2} d ^-1 5月20日和6.0±1.6毫摩尔C M ^- 5月30日² d ^-1。应用于5月20日至30日的非稳态模型将产生24.3 mmol C m ^-2 d ^-1的POC出口。非稳态（NSS）²¹⁰在相同的时间间隔内（37.3和45.0 mmol m ^-2 d ^-1，取决于所使用的POC / Th比率），Po衍生的POC通量与以前从²³⁴ Th / ²³⁸ U不平衡所估算的通量可比，但略小于这些通量。。相比之下，从5月20日至30日在150 m处部署的浮动沉积物陷阱测得的POC通量为11.6 mmol m ^-2 d ^-1。这些结果表明，NABE期间非稳态Po衍生的POC通量与从²³⁴ Th / ²³⁸ U不平衡中导出的POC通量非常吻合，并且在约2倍内与沉积物捕集通量吻合。但是，与²³⁴不同必须考虑Th-POC通量代理，²¹⁰ Pb（²¹⁰ Po的前兆）剖面的非稳态变化。