In situ particle measurements deemphasize the role of size in governing the sinking velocity of marine particles
In situ particle measurements deemphasize the role of size in governing the sinking velocity of marine particles
Sinking particles are important in delivering carbon to the deep ocean where it may be stored out of contact with the atmosphere. Whilst particle sinking velocities are known to be influenced by a multitude of factors, size-based parameterizations remain common in biogeochemical models and in the methods used to determine particulate fluxes from autonomous platforms. Here we carried out an extensive literature review (62 data sets) into the size-sinking velocity relationship, and find the relationship is much weaker for studies examining particles in situ (median R2 = 0.09) compared with ex situ studies (median R2 = 0.35). This discrepancy may be because particles examined in the laboratory have more uniform properties than those studied in situ. Our review highlights the shortcomings of using a simple relationship between size and sinking velocity to calculate sinking particulate fluxes in the ocean; considering additional particle characteristics will enable more accurate calculations of particulate fluxes.
Williams, J.R.
113d9c7f-7439-42ef-9972-4a6217fd57c1
Giering, S.L.C.
e9b75287-e35e-414a-a5f2-cef9f2ab2efd
2 November 2022
Williams, J.R.
113d9c7f-7439-42ef-9972-4a6217fd57c1
Giering, S.L.C.
e9b75287-e35e-414a-a5f2-cef9f2ab2efd
Williams, J.R. and Giering, S.L.C.
(2022)
In situ particle measurements deemphasize the role of size in governing the sinking velocity of marine particles.
Geophysical Research Letters, 49 (21), [e2022GL099563].
(doi:10.1029/2022GL099563).
Abstract
Sinking particles are important in delivering carbon to the deep ocean where it may be stored out of contact with the atmosphere. Whilst particle sinking velocities are known to be influenced by a multitude of factors, size-based parameterizations remain common in biogeochemical models and in the methods used to determine particulate fluxes from autonomous platforms. Here we carried out an extensive literature review (62 data sets) into the size-sinking velocity relationship, and find the relationship is much weaker for studies examining particles in situ (median R2 = 0.09) compared with ex situ studies (median R2 = 0.35). This discrepancy may be because particles examined in the laboratory have more uniform properties than those studied in situ. Our review highlights the shortcomings of using a simple relationship between size and sinking velocity to calculate sinking particulate fluxes in the ocean; considering additional particle characteristics will enable more accurate calculations of particulate fluxes.
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Geophysical Research Letters - 2022 - Williams - In Situ Particle Measurements Deemphasize the Role of Size in Governing
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Accepted/In Press date: 5 October 2022
e-pub ahead of print date: 18 October 2022
Published date: 2 November 2022
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Local EPrints ID: 501846
URI: http://eprints.soton.ac.uk/id/eprint/501846
ISSN: 0094-8276
PURE UUID: 8092903c-063f-48b9-8d4d-55e3ab07a75d
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Date deposited: 11 Jun 2025 16:30
Last modified: 21 Aug 2025 04:47
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S.L.C. Giering
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