Time-series sediment traps were deployed on the Chukchi Sea and East Siberian Sea slopes from August 2017 to August 2018 with the aim of elucidating the temporal and spatial variations in particle fluxes and identifying the main processes affecting those variations. Particle fluxes showed a typical seasonal pattern, with high values in summer and low values in other seasons, and a large inter-annual variation was observed only on the East Siberian Sea slope, where particle fluxes were one order of magnitude higher in early August 2018 than in late August 2017. This large inter-annual variation in particle flux resulted from the episodic intrusion of nutrient-enriched shelf water in the East Siberian Sea, which enhanced biological production at the surface and particle fluxes. The Chukchi Sea slope was influenced by the inflow of Anadyr Water, with high salinity and high nutrient concentrations, which had little annual variability. Therefore, particle flux showed little inter-annual variation on the Chukchi Sea slope. Under-ice phytoplankton blooms were observed in both the Chukchi Sea and East Siberian Sea slopes, and increases in particulate organic carbon (POC) flux and the C:N ratio under the sea ice were related to transparent exopolymer (TEP) production by ice algae. On the East Siberian Sea slope, particle fluxes increased slightly from 115 to 335 m, indicating lateral transport of suspended particulate matter; POC and lithogenic particles may be laterally transported to the slope as nutrient-rich shelf waters flowed from the East Siberian Sea to the Makarov Basin. Annual POC fluxes were 2.3 and 2.0 g C m–2 year–1 at 115 and 335 m, respectively, on the East Siberian Sea slope and was 2.1 g C m–2 year–1 at 325 m on the Chukchi Sea slope. Annual POC fluxes were higher on the Chukchi Sea and East Siberian Sea slopes than in Arctic basins, lower than on Arctic shelves, and generally similar to those on western Arctic slopes.

中文翻译：

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2017-2018年楚科奇海和东西伯利亚海斜坡粒子通量的时空变化

2017 年 8 月至 2018 年 8 月，在楚科奇海和东西伯利亚海斜坡部署了时间序列沉积物圈闭，目的是阐明粒子通量的时空变化，并确定影响这些变化的主要过程。粒子通量呈现典型的季节性规律，夏季高值其他季节低值，仅在东西伯利亚海坡上观测到较大的年际变化，2018年8月上旬粒子通量高一个数量级与 2017 年 8 月下旬相比。 这种粒子通量的年际变化很大是由于东西伯利亚海富含营养的陆架水的间歇性侵入，这增强了地表的生物产量和粒子通量。楚科奇海坡受阿纳德尔水流入的影响，盐度高、养分浓度高，年变化不大。因此，楚科奇海斜坡上的粒子通量几乎没有年际变化。在楚科奇海和东西伯利亚海斜坡都观察到冰下浮游植物大量繁殖，海冰下颗粒有机碳 (POC) 通量和 C:N 比的增加与冰藻产生的透明外聚体 (TEP) 相关. 在东西伯利亚海斜坡上，颗粒通量从 115 m 略微增加到 335 m，表明悬浮颗粒物的横向输送；随着富含营养的陆架水从东西伯利亚海流向马卡罗夫盆地，POC 和成岩颗粒可能会横向输送到斜坡。在 115 和 335 m 处，年 POC 通量分别为 2.3 和 2.0 g C m-2 year-1，在东西伯利亚海坡上，在楚科奇海坡上 325 m 处为 2.1 g C m–2 year–1。楚科奇海和东西伯利亚海斜坡的年POC通量高于北极盆地，低于北极大陆架，与北极西部斜坡的年POC通量大致相似。