Seasonal variations in the contribution of zooplankton fecal pellets to the particulate organic carbon fluxes over the slopes of the Pacific Arctic region

IF 3.8 3区 地球科学 Q1 OCEANOGRAPHY
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Abstract

As part of the Korea Arctic Mooring System (KAMS), sequential sediment traps were deployed at KAMS1 over the East Siberian Sea slope (∼115 and ∼335 m) and at KAMS2 over the Chukchi Sea slope (325 m) to collect sinking particles from August 2017 to August 2019. Fecal pellet carbon (FPC) fluxes and their contribution to the particulate organic carbon (POC) fluxes were measured to assess the role of zooplankton fecal pellets in the biological carbon pump at both sites. FPC fluxes increased at the onset of an under-ice bloom and peaked during the melt period at both sites in 2018. At KAMS1, a remarkable increase in FPC fluxes reflected the enhanced grazing of large copepods during the anomalously productive spring and summer of 2018, however their contributions to the POC fluxes mostly remained <10%. At KAMS2, relatively low FPC fluxes during the under-ice bloom suggested the export of a larger proportion of pellets produced by small copepods. Sustained FPC fluxes from January to May 2018 at KAMS2 contributed up to 24% of the POC fluxes, possibly resulting from pellet production by overwintering copepods grazing on particles laterally transported into the region in the presence of ice. These results indicate that despite their limited contribution to the POC fluxes, FPC fluxes varied with food availability, zooplankton community structure, and hydrographic conditions over the East Siberian and Chukchi Sea slopes.

浮游动物排泄物对太平洋北极地区斜坡颗粒有机碳通量贡献的季节性变化
作为韩国北极系泊系统(KAMS)的一部分,2017 年 8 月至 2019 年 8 月期间,在东西伯利亚海斜坡(115 米至∼335 米)的 KAMS1 和楚科奇海斜坡(325 米)的 KAMS2 上部署了连续沉积物捕集器,以收集下沉颗粒。测量了粪便颗粒碳(FPC)通量及其对颗粒有机碳(POC)通量的贡献,以评估浮游动物粪便颗粒在这两个地点的生物碳泵中的作用。FPC 通量在冰下水华开始时增加,并在 2018 年两个站点的融化期达到峰值。在KAMS1,FPC通量显著增加,反映了大型桡足类在2018年异常高产的春季和夏季加强了捕食,然而它们对POC通量的贡献大多保持在<10%。在 KAMS2,冰下水华期间相对较低的 FPC 通量表明,小型桡足类产生的颗粒的出口比例较大。2018 年 1 月至 5 月,KAMS2 的持续 FPC 通量贡献了高达 24% 的 POC 通量,这可能是由于越冬桡足类在有冰的情况下捕食横向运入该区域的颗粒而产生的颗粒。这些结果表明,尽管对 POC 通量的贡献有限,但 FPC 通量随东西伯利亚和楚科奇海斜坡的食物供应、浮游动物群落结构和水文条件而变化。
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来源期刊
Progress in Oceanography
Progress in Oceanography 地学-海洋学
CiteScore
7.20
自引率
4.90%
发文量
138
审稿时长
3 months
期刊介绍: Progress in Oceanography publishes the longer, more comprehensive papers that most oceanographers feel are necessary, on occasion, to do justice to their work. Contributions are generally either a review of an aspect of oceanography or a treatise on an expanding oceanographic subject. The articles cover the entire spectrum of disciplines within the science of oceanography. Occasionally volumes are devoted to collections of papers and conference proceedings of exceptional interest. Essential reading for all oceanographers.
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