The Role of Acantharia in Southern Ocean Strontium Cycling and Carbon Export: Insights From Dissolved Strontium Concentrations and Seasonal Flux Patterns

IF 5.4 2区地球科学 Q1 ENVIRONMENTAL SCIENCES

Global Biogeochemical Cycles Pub Date : 2024-10-21 DOI:10.1029/2024GB008227

Yaojia Sun, Cathryn A. Wynn-Edwards, Thomas W. Trull, Michael J. Ellwood

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Abstract

Dissolved strontium (Sr) concentrations from Southern Ocean water samples and Sr export fluxes from sediment trap moorings at 1,000 m were used to assess particulate organic carbon (POC) export associated with Acantharia for 2010, 2018, and 2020. The dissolved Sr data revealed a prominent vertical gradient with lower surface Sr concentrations depleted up to 1.5% relative to deep waters. A strong latitudinal surface gradient was observed, ranging from 86.8 μmol kg⁻¹ near the northern end to 88.0 μmol kg⁻¹ near the southern end of a transect through the Australian sector of the Southern Ocean. The vertical and latitudinal gradients are associated with celestite (SrSO₄) precipitation by Acantharia and subsequent export to depth. Seasonal variability in Sr export fluxes can be large, particularly during intense events in summer, and reaches a maximum of 11.7 mmol Sr m⁻² yr⁻¹, contributing up to 7% of the POC export flux. The coincidence of Sr flux with the second peak of POC export flux implies an association of Acantharia biomass with summertime productivity.

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南大洋锶循环和碳输出中的棘尾藻作用：溶解锶浓度和季节通量模式的启示

利用南大洋水样中的溶解锶（Sr）浓度和 1,000 米处沉积物捕集锚系设备的 Sr 出口通量，评估了 2010 年、2018 年和 2020 年与棘尾藻有关的颗粒有机碳（POC）出口情况。溶解态 Sr 数据揭示了一个显著的垂直梯度，相对于深海而言，较低的表层 Sr 浓度消耗高达 1.5%。在穿越南大洋澳大利亚部分的横断面上，观察到了强烈的纬度表面梯度，从靠近北端的 86.8 μmol kg-1 到靠近南端的 88.0 μmol kg-1。垂直梯度和纬度梯度与棘尾藻沉淀天青石（SrSO4）并随后向深海输出有关。锶输出通量的季节变化很大，尤其是在夏季的强烈事件期间，最大可达 11.7 mmol Sr m-2 yr-1，占 POC 输出通量的 7%。锶通量与 POC 出口通量的第二个峰值相吻合，这意味着棘尾藻的生物量与夏季生产力有关。

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来源期刊

Global Biogeochemical Cycles 环境科学-地球科学综合

CiteScore

8.90

自引率

7.70%

发文量

141

审稿时长

8-16 weeks

期刊介绍： Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.