A mechanism for high-frequency variability in sapropels

J.P. Dirksen; P. Meijer

doi:10.1016/j.margeo.2022.106812

A mechanism for high-frequency variability in sapropels

J.P. Dirksen, P. Meijer

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Abstract

Sapropels deposited in the Mediterranean Sea provide high resolution records of past oceanographic changes. Previous studies have found abrupt transitions in chemical composition of these sediments. We present a transient box model that provides a potential mechanism for these transitions. The high-frequency variability is a result of fluxes stopping or changing direction, causing a relaxation towards a new equilibrium. The time scales depend on the volume of the reservoirs and the magnitude of the fluxes. We find typical periods in the order of 100–1000 years, similar to what has been found in sediment cores.

Original language	English
Article number	106812
Pages (from-to)	1-9
Number of pages	9
Journal	Marine Geology
Volume	448
DOIs	https://doi.org/10.1016/j.margeo.2022.106812
Publication status	Published - Jun 2022

Keywords

Sapropels
Transient box model
High-frequency variability

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10.1016/j.margeo.2022.106812Licence: CC BY

1-s2.0-S0025322722000834-mainFinal published version, 4.31 MBLicence: CC BY

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title = "A mechanism for high-frequency variability in sapropels",

abstract = "Sapropels deposited in the Mediterranean Sea provide high resolution records of past oceanographic changes. Previous studies have found abrupt transitions in chemical composition of these sediments. We present a transient box model that provides a potential mechanism for these transitions. The high-frequency variability is a result of fluxes stopping or changing direction, causing a relaxation towards a new equilibrium. The time scales depend on the volume of the reservoirs and the magnitude of the fluxes. We find typical periods in the order of 100–1000 years, similar to what has been found in sediment cores.",

keywords = "Sapropels, Transient box model, High-frequency variability",

author = "J.P. Dirksen and P. Meijer",

note = "Funding Information: This work was financially supported by The Netherlands Research Centre for Integrated Solid Earth Science (ISES 2017-UU-23). The authors would like to thank Ronja Ebner for her help with the formulas and many useful discussions. We thank Ton Markus for the graphical design of Fig. 3 . We thank the editor (Shu Gao), reviewer Cecile L. Blanchet and an anonymous reviewer for their constructive and thoughtful comments. Publisher Copyright: {\textcopyright} 2022 The Authors",

year = "2022",

month = jun,

doi = "10.1016/j.margeo.2022.106812",

language = "English",

volume = "448",

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T1 - A mechanism for high-frequency variability in sapropels

AU - Dirksen, J.P.

AU - Meijer, P.

N1 - Funding Information: This work was financially supported by The Netherlands Research Centre for Integrated Solid Earth Science (ISES 2017-UU-23). The authors would like to thank Ronja Ebner for her help with the formulas and many useful discussions. We thank Ton Markus for the graphical design of Fig. 3 . We thank the editor (Shu Gao), reviewer Cecile L. Blanchet and an anonymous reviewer for their constructive and thoughtful comments. Publisher Copyright: © 2022 The Authors

PY - 2022/6

Y1 - 2022/6

N2 - Sapropels deposited in the Mediterranean Sea provide high resolution records of past oceanographic changes. Previous studies have found abrupt transitions in chemical composition of these sediments. We present a transient box model that provides a potential mechanism for these transitions. The high-frequency variability is a result of fluxes stopping or changing direction, causing a relaxation towards a new equilibrium. The time scales depend on the volume of the reservoirs and the magnitude of the fluxes. We find typical periods in the order of 100–1000 years, similar to what has been found in sediment cores.

AB - Sapropels deposited in the Mediterranean Sea provide high resolution records of past oceanographic changes. Previous studies have found abrupt transitions in chemical composition of these sediments. We present a transient box model that provides a potential mechanism for these transitions. The high-frequency variability is a result of fluxes stopping or changing direction, causing a relaxation towards a new equilibrium. The time scales depend on the volume of the reservoirs and the magnitude of the fluxes. We find typical periods in the order of 100–1000 years, similar to what has been found in sediment cores.

KW - Sapropels

KW - Transient box model

KW - High-frequency variability

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U2 - 10.1016/j.margeo.2022.106812

DO - 10.1016/j.margeo.2022.106812

M3 - Article

SN - 0025-3227

VL - 448

SP - 1

EP - 9

JO - Marine Geology

JF - Marine Geology

M1 - 106812

ER -

A mechanism for high-frequency variability in sapropels

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Keywords

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