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Can Organic Matter Flux Profiles Be Diagnosed Using Remineralisation Rates Derived from Observed Tracers and Modelled Ocean Transport Rates? : Volume 12, Issue 6 (19/03/2015)

By Wilson, J. D.

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Book Id: WPLBN0003988466
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: Can Organic Matter Flux Profiles Be Diagnosed Using Remineralisation Rates Derived from Observed Tracers and Modelled Ocean Transport Rates? : Volume 12, Issue 6 (19/03/2015)  
Author: Wilson, J. D.
Volume: Vol. 12, Issue 6
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Ridgwell, A., Barker, S., & Wilson, J. D. (2015). Can Organic Matter Flux Profiles Be Diagnosed Using Remineralisation Rates Derived from Observed Tracers and Modelled Ocean Transport Rates? : Volume 12, Issue 6 (19/03/2015). Retrieved from http://worldlibrary.net/


Description
Description: School of Earth and Ocean Sciences, Cardiff University, Cardiff, UK. The average depth in the ocean at which the majority of sinking organic matter particles remineralise is a fundamental parameter in the oceans role in regulating atmospheric CO2. Observed spatial patterns in sinking fluxes and relationships between the fluxes of different particles in the modern ocean have widely been used to invoke controlling mechanisms with important implications for CO2 regulation. However, such analyses are limited by the sparse spatial sampling of the available sediment trap data. Here we explore whether model ocean circulation rates, in the form of a transport matrix, can be used to derive remineralisation rates and sinking particle flux curves from the much more highly resolved observations of dissolved nutrient concentrations. Initially we use the Earth system model GENIE to generate a synthetic tracer dataset to explore the methods and its sensitivity to key sources of uncertainty arising from errors in the tracer observations and in the model circulation. We use a perturbed physics ensemble to generate 54 different estimates of circulation to explore errors associated with model transport rates. We find that reconstructed remineralisation rates are highly sensitive to both errors in observations and our ensemble uncertainty in model circulation rates such that a simple inversion does not provide a robust estimate of particulate flux profiles. Inferred remineralisation rates are particularly sensitive to differences between the observed and modelled transport fluxes because remineralisation rates are 3–4 magnitudes smaller than circulation rates. We also find that when inferring particle flux curves from remineralisation rates the cycling of dissolved organic matter also creates biases that have a similar magnitude and spatial variability to flux curves diagnosed using sediment trap data. We end with a discussion on the potential future directions and pitfalls of estimating remineralisation rates using model circulation schemes.

Summary
Can organic matter flux profiles be diagnosed using remineralisation rates derived from observed tracers and modelled ocean transport rates?

Excerpt
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