Export of Dissolved Organic Carbon (DOC) compared to the particulate and active fluxes near South Georgia, Southern Ocean

IF 2.3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography Pub Date : 2023-10-02 DOI:10.1016/j.dsr2.2023.105338

Elisa Lovecchio , Louis Clément , Claire Evans , Rachel Rayne , Cynthia Dumousseaud , Saeed Roshan , Sarah L.C. Giering , Adrian Martin

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引用次数: 0

Abstract

Quantifying the relative contributions of the export of particulate organic carbon (POC), dissolved organic carbon (DOC) and active fluxes by migrating organisms is essential to understand the functioning and vulnerability of the ocean's biological pump. However, these fluxes are rarely measured at the same time. Here we provide a first simultaneous comparison of these biological pump components in the region of South Georgia. We use a combination of in-situ data and an inverse model to calculate the DOC export and the suspended POC export and compare them to the sinking POC and active export. We find that, in this region, the DOC total export contributes about 6.6% (23.0–37.5 mg C m⁻² day⁻¹) to the total export flux, the active flux has no discernible contribution, and the sinking POC flux is dominant with a mean value of 409 mg C m⁻² day⁻¹. Diapycnal fluxes of DOC obtained from the cruise data constitute only a minor fraction (0.05–1.28 mg C m⁻² day⁻¹) of the total DOC export estimated by the inverse model and are exceeded on average by the diapycnal flux of suspended POC. Our results also indicate that the total export of DOC is driven by isopycnal transport. Future fieldwork in the region of South Georgia should focus on quantifying the isopycnal flux of DOC. Future measurement campaigns should also aim to simultaneously measure the particulate, dissolved and active components of the biological pump at contrasting locations and at different times to resolve the variability of their relative contribution.

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南乔治亚附近溶解有机碳（DOC）的出口与颗粒物和活性通量的比较

量化迁移生物出口颗粒有机碳（POC）、溶解有机碳（DOC）和活性通量的相对贡献，对于了解海洋生物泵的功能和脆弱性至关重要。然而，很少同时测量这些通量。在这里，我们首次同时比较了南乔治亚地区的这些生物泵组件。我们使用现场数据和反向模型的组合来计算DOC输出和暂停POC输出，并将其与下沉POC和活动输出进行比较。我们发现，在该地区，DOC总出口对总出口通量的贡献约为6.6%（23.0–37.5 mg C m−2 day−1），活跃通量没有明显贡献，下沉POC通量占主导地位，平均值为409 mg C m−2 day-1。从巡航数据中获得的DOC滞育通量仅占反向模型估计的DOC总出口的一小部分（0.05–1.28 mg C m−2 day−1），并且平均超过了悬浮POC的滞育通量。我们的研究结果还表明，DOC的总出口是由等密度运输驱动的。未来在南乔治亚地区的实地调查应侧重于量化DOC的等密度通量。未来的测量活动还应旨在同时测量生物泵在不同位置和不同时间的颗粒、溶解和活性成分，以解决其相对贡献的可变性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Deep-sea Research Part Ii-topical Studies in Oceanography 地学-海洋学

CiteScore

6.40

自引率

16.70%

发文量

115

审稿时长

3 months

期刊介绍： Deep-Sea Research Part II: Topical Studies in Oceanography publishes topical issues from the many international and interdisciplinary projects which are undertaken in oceanography. Besides these special issues from projects, the journal publishes collections of papers presented at conferences. The special issues regularly have electronic annexes of non-text material (numerical data, images, images, video, etc.) which are published with the special issues in ScienceDirect. Deep-Sea Research Part II was split off as a separate journal devoted to topical issues in 1993. Its companion journal Deep-Sea Research Part I: Oceanographic Research Papers, publishes the regular research papers in this area.