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Benoît Pasquier, Mark Holzer, Matthew A. Chamberlain, Richard J. Matear, Nathaniel L. Bindoff, François W. Primeau

Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump

Accurate predictive modeling of the ocean’s global carbon and oxygen cycles is challenging because of uncertainties in both …

GNOM v1.0: an optimized steady-state model of the modern marine neodymium cycle

Spatially distant sources of neodymium (Nd) to the ocean that carry different isotopic signatures (εNd) have been shown to trace out …

Benoît Pasquier, Sophia K. V. Hines, Hengdi Liang, Yingzhe Wu, Steven L. Goldstein, Seth G. John

Benoît Pasquier, François W. Primeau, Seth G. John

AIBECS.jl: A tool for exploring global marine biogeochemical cycles

Benoît Pasquier, François W. Primeau

The F-1 algorithm for efficient computation of the Hessian matrix of an objective function defined implicitly by the solution of a steady-state problem

Draft PDF Draft Supplement

A new metric of the biological carbon pump: number of pump passages and its control on atmospheric pCO₂

We develop novel locally defined diagnostics for the efficiency of the ocean’s biological pump by tracing carbon throughout its …

Mark Holzer, Eun Young Kwon, Benoît Pasquier

Evaluating the Benefits of Bayesian Hierarchical Methods for Analyzing Heterogeneous Environmental Datasets: A Case Study of Marine Organic Carbon Fluxes

Large compilations of heterogeneous environmental observations are increasingly available as public databases, allowing researchers to …

Gregory L. Britten, Yara Mohajerani, Louis Primeau, Murat Aydin, Catherine Garcia, Weilei Wang, Benoît Pasquier, Barry B. Cael, François W. Primeau

Mark Holzer, Benoît Pasquier, Timothy DeVries, Mark Brzezinski

Diatom Physiology Controls Silicic Acid Leakage in Response to Iron Fertilization

We explore how the iron dependence of the Si:P uptake ratio R^Si:P of diatoms controls the response of the global silicon cycle and …

Perspective on identifying and characterizing the processes controlling iron speciation and residence time at the atmosphere–ocean interface

It is well recognized that the atmospheric deposition of iron (Fe) affects ocean productivity, atmospheric CO2 uptake, ecosystem …

Nicholas Meskhidze, Christoph Völker, Hind A. Al-Abadleh, Katherine Barbeau, Matthieu Bressac, Clifton Buck, Randelle M. Bundy, Peter Croot, Yan Feng, Akinori Ito, Anne M. Johansen, William M. Landing, Jingqiu Mao, Stelios Myriokefalitakis, Daniel Ohnemus, Benoît Pasquier, Ying Ye

The number of past and future regenerations of iron in the ocean and its intrinsic fertilization efficiency

Iron fertilization is explored by tracking dissolved iron (DFe) through its life cycle from injection by aeolian, sedimentary, and …

Inverse-model estimates of the ocean's coupled phosphorus, silicon, and iron cycles

The ocean’s nutrient cycles are important for the carbon balance of the climate system and for shaping the ocean’s …

Mark Holzer, Benoît Pasquier, Marina Frants

The age of iron and iron source attribution in the ocean

We use tracers to partition dissolved iron (dFe) into the contributions from each source within a numerical model of the iron cycle …

The plumbing of the global biological pump: Efficiency control through leaks, pathways, and time scales

We systematically quantify the pathways and time scales that set the efficiency, E_bio, of the global biological pump by applying …

Projects

Ocean Grids

OceanGrids.jl: Ocean grids for AIBECS.

AIBECS

The ideal tool for exploring global marine biogeochemical cycles.

Dual Matrix Tools

DualMatrixTools.jl: A Julia package for solving dual-valued linear systems.

F-1 Method

A simple, accurate, and fast AD tool for computing the Hessian of an objective function defined implictly by a system of PDEs.

World Ocean Atlas Tools

WorldOceanAtlasTools.jl: A Julia package for data from the World Ocean Atlas.

Hyper Dual Matrix Tools

HyperDualMatrixTools.jl: A Julia package for solving hyperdual-valued linear systems.

Inpaintings

Inpaintings.jl: A Julia package to inpaint missing data.

Talks/Posters

AIBECS.jl: the ideal tool for marine biogeochemistry modelling

Progress in global marine biogeochemistry increasingly relies on models. In general, converting conceptual mechanisms into useful …

Feb 20, 2020 San Diego Convention Center, San Diego, California, USA

Benoît Pasquier, François Primeau

F-1 algorithm: Efficient differentiation through large steady-state problems

Introducing a Julia package to efficiently differentiate an objective function defined implicitly by the solution of a large PDE …

Aug 8, 2019 School of Mathematics and Statistics, UNSW, Australia

Benoît Pasquier, François Primeau

Slides

Introducing AIBECS.jl, a Julia package for creating global marine biogeochemistry models

Running standard global marine biogeochemistry models comes with large computational costs and with a steep learning curve. The …

Aug 7, 2019 Climate Change Research Centre (CCRC), UNSW, Australia

Benoît Pasquier, François Primeau, J. Keith Moore

Slides

The number of past and future regenerations of iron in the ocean and its intrinsic fertilization efficiency

Jan 25, 2019 Massachussets Institute of Technology, Cambridge, Massachussets, USA

Developing a new, open-source, user-friendly, fast, modular, global marine biogeochemistry model (in Julia)

One of the most successful tools made available to oceanographers recently is the Ocean Data View (ODV) software, used “for the …

Jan 24, 2019 Massachussets Institute of Technology, Cambridge, Massachussets, USA

Offline parameter optimization for global marine biogeochemical models

Feb 21, 2018 Department of Earth System Science, UCI, Irvine, USA

Inverse-model estimates of the ocean's coupled phosphorus, silicon, and iron cycles

A key question about the iron cycle is how much export is supported by the different iron sources (aeolian, sedimentary, and …

Feb 12, 2018 Oregon Convention Center, Portland, Oregon, USA

The efficiency of different iron sources in supporting the ocean's global biological pump

Nov 7, 2017 Department of Earth System Science, UCI, Irvine, USA

Response of the biological pump to perturbations in the iron supply: Global teleconnections diagnosed using an inverse model of the coupled phosphorus–silicon–iron nutrient cycles

We construct a mechanistic inverse model of the ocean’s coupled phosphorus, silicon, and iron cycles and analyze the response of …

Feb 8, 2017 Manning Clark Centre, ANU, Canberra, Australia

Exploring iron control on global productivity: "FePSi", an inverse model of the ocean's coupled phosphate, silicon and iron cycles

“FePSi” is the first data-constrained mechanistic inverse model coupling the iron (Fe), phosphorus (P), and silicon (Si) …

Jun 8, 2016 UNSW, Sydney, Australia

Benoît Pasquier, Mark Holzer, Marina Frants

Iron control on global productivity: an efficient inverse model of the ocean's coupled phosphate, silicon, and iron cycles

We construct a data-constrained mechanistic inverse model of the ocean’s coupled phosphorus and iron cycles. The nutrient cycling …

Feb 25, 2016 Ernest N. Morial Convention Center, New Orleans, Louisiana, USA

The plumbing of the global biological pump

We quantify the timescales and pathways that set the efficiency of the biological pump (the fraction of the phosphate inventory that is …

Jul 16, 2015 Brisbane Conference and Exhibition Centre (BCEC), Queensland, Australia

An efficient inverse model of the ocean's coupled nutrient cycles

We construct a data-constrained model of the ocean’s coupled macronutrient and micronutrient cycles. The model focuses initially …

Jun 11, 2015 UNSW, Sydney, Australia

Plumbing of the biological pump

Nutrient transport and biological teleconnections of Ocean surface regions are diagnosed in a data-assimilated circulation model …

Oct 1, 2014 UNSW, Sydney, Australia