Preprints
https://doi.org/10.5194/egusphere-2022-814
https://doi.org/10.5194/egusphere-2022-814
23 Aug 2022
 | 23 Aug 2022

Drivers of Particle Sinking Velocities in the Peruvian Upwelling System

Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell

Abstract. As one of Earth’s most productive marine ecosystems, the Peruvian Upwelling System transports large amounts of biogenic matter from the surface to the deep ocean. Whilst particle sinking velocity is a key factor controlling the biological pump, thereby affecting carbon sequestration and O2-depletion, it has not yet been measured in this system. During a 50-day mesocosm experiment in the surface waters off the coast of Peru, we measured particle sinking velocities and their biogeochemical and physical drivers. We further characterized the general properties of exported particles under different phytoplankton communities and nutritional states. Average sinking velocities varied between size classes and ranged from 12.8 ± 0.7 m d-1 (particles 40–100 µm), to 19.4 ± 0.7 m d-1 (particles 100–250 µm), and 34.2 ± 1.5 m d-1 (particles 250–1000 µm) (±95% CI). Surprisingly, no relationship between opal ballast and sinking velocity could be identified, despite the presence of diatoms, questioning the importance of opal ballast in freshly produced material sinking from the surface. In contrast, we found higher sinking velocities with increasing particle size, compactness and roundness. Size had by far the strongest influence among these physical particle properties. Our study provides a detailed analysis of the drivers of particle sinking velocity in the Peruvian Upwelling System, which allows modelers to optimize local particle flux parameterization. This will help to better project oxygen concentrations and carbon sequestration in a region that is subject to substantial climate-driven changes.

Journal article(s) based on this preprint

05 Jul 2023
Drivers of particle sinking velocities in the Peruvian upwelling system
Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell
Biogeosciences, 20, 2595–2612, https://doi.org/10.5194/bg-20-2595-2023,https://doi.org/10.5194/bg-20-2595-2023, 2023
Short summary
Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-814', Emmanuel C. Laurenceau-Cornec, 27 Sep 2022
    • AC1: 'Reply on RC1 and RC2', Moritz Baumann, 12 Nov 2022
    • EC1: 'Reply on RC1', Hans-Peter Grossart, 15 Nov 2022
  • RC2: 'Comment on egusphere-2022-814', Emma Cavan, 29 Sep 2022
    • AC2: 'Reply on RC1 and RC2', Moritz Baumann, 12 Nov 2022
    • EC2: 'Reply on RC2', Hans-Peter Grossart, 15 Nov 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-814', Emmanuel C. Laurenceau-Cornec, 27 Sep 2022
    • AC1: 'Reply on RC1 and RC2', Moritz Baumann, 12 Nov 2022
    • EC1: 'Reply on RC1', Hans-Peter Grossart, 15 Nov 2022
  • RC2: 'Comment on egusphere-2022-814', Emma Cavan, 29 Sep 2022
    • AC2: 'Reply on RC1 and RC2', Moritz Baumann, 12 Nov 2022
    • EC2: 'Reply on RC2', Hans-Peter Grossart, 15 Nov 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (30 Nov 2022) by Hans-Peter Grossart
AR by Moritz Baumann on behalf of the Authors (14 Apr 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (17 Apr 2023) by Hans-Peter Grossart
RR by Sven Tobias-Hunefeld (25 Apr 2023)
ED: Publish subject to minor revisions (review by editor) (17 May 2023) by Hans-Peter Grossart
AR by Moritz Baumann on behalf of the Authors (18 May 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (23 May 2023) by Hans-Peter Grossart
AR by Moritz Baumann on behalf of the Authors (29 May 2023)

Journal article(s) based on this preprint

05 Jul 2023
Drivers of particle sinking velocities in the Peruvian upwelling system
Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell
Biogeosciences, 20, 2595–2612, https://doi.org/10.5194/bg-20-2595-2023,https://doi.org/10.5194/bg-20-2595-2023, 2023
Short summary
Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell
Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell

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Latest update: 30 Jan 2024
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Short summary
The sinking velocity of marine particles affects how much atmospheric CO2 is stored inside our oceans. We measured particle sinking velocities in the Peruvian Upwelling System and assessed their physical and biochemical drivers. We found that sinking velocity was mainly influenced by particle size and compactness, while ballasting minerals played only a minor role. Our findings help to better understand the particle sinking dynamics in this highly productive marine system.