podcast by Reviewer2DoesGeoengineering, 1h 24 min
Lennart Bach returns to discuss his modelling paper on ocean / atmosphere exchange of CO2.
Paper: L. T. Bach, V. M. Tamsitt, K. Baldry, et al. (2023): Identifying the most (cost-)efficient regions for CO2 removal with Iron Fertilization in the Southern Ocean. Authorea. DOI: 10.22541/essoar.167979670.07996683/v1.
Alessandro Tagliabue, Benjamin S. Twining, Nicolas Barrier, Olivier Maury, Manon Berger, Laurent Bopp IN: Global Change Biology, https://doi.org/10.1111/gcb.16854
Previous OIF (ocean iron fertilization) modelling has found that while carbon export increases, nutrient transport to lower latitude ecosystems declines, resulting in a modest impact on atmospheric CO2. Here, the authors combine global ocean biogeochemistry and ecosystem models to show that, while stimulating carbon sequestration, OIF (may amplify climate-induced declines in tropical ocean productivity and ecosystem biomass under a high-emission scenario, with very limited potential atmospheric CO2 drawdown.
Eelco J Rohling IN: Oxford Open Climate Change, kgad004, https://doi.org/10.1093/oxfclm/kgad004
This review outlines the basic operation of the marine carbon cycle in straightforward terms, with some simplifications, to help advance the debate among the wider community. Break-out boxes provide additional detail where desired, and references (and the sources cited therein) provide avenues for further study. The review then discusses two potential marine methods for atmospheric carbon removal that are thought to offer the greatest potential in terms of carbon removal mass: ocean iron fertilization and ocean alkalinity enhancement.
Clive Cookson on ft.com
„…This renewed interest has also given a new lease of life to ocean-based methods of carbon dioxide removal (CDR). While fertilisation to stimulate the growth of green phytoplankton (microscopic algae), which absorb CO₂ in nutrient-poor waters, will be used in the Alaska and New England projects, there are other methods. One is to counter the growing acidity of seawater as it absorbs CO₂ by adding alkaline minerals, enhancing its absorptive capacity.“
by Warren Cornwall at science.org
Panel report fuels interest in tests of artificially triggered plankton blooms – Iron fertilization is among the cheapest options.
Yuan, Peng; Liu, Dong (2021): Proposing a potential strategy concerning Mineral-enhanced Biological Pump (MeBP) for improving Ocean Iron Fertilization (OIF). In Applied Clay Science 207, p. 106096. DOI: 10.1016/j.clay.2021.106096.
„To address the low efficiency of the vertical C export of OIF, a potential strategy for enhancing oceanic biological pump using clay minerals, so-called mineral-enhanced biological pump (MeBP), is proposed herein.“
Ming, Tingzhen; Richter, Renaud de; Dietrich Oeste, Franz; Tulip, Robert; Caillol, Sylvain (2021): A nature-based negative emissions technology able to remove atmospheric methane and other greenhouse gases. In Atmospheric Pollution Research. DOI: 10.1016/j.apr.2021.02.017.
„As some anthropogenic emissions cannot be zero, to compensate them it will be necessary to remove GHGs from the atmosphere. Among possible methods, the Iron Salt Aerosol (ISA) offers new possibilities, including removal of methane and several other GHGs, as well as carbon dioxide.“
„A team of scientists together with climate and policy experts from leading international organizations in 11 countries*, grouped under the new Horizon 2020 project NEGEM, will quantify and assess the feasibility and the realistic potential of carbon dioxide removal, as a supplementary strategy to emission mitigation.“
„From 1 July, scientists from 14 institutions in six countries will be examining the opportunities and risks of ocean-based technologies for negative emissions.“
Yamamoto, Akitomo; Abe-Ouchi, Ayako; Ohgaito, Rumi; Ito, Akinori; Oka, Akira (2019): Glacial CO2 decrease and deep-water deoxygenation by iron fertilization from glaciogenic dust. In Clim. Past Discuss. (under review). DOI: 10.5194/cp-2019-31.
„In this study, we report the significance of iron fertilization from glaciogenic dust for glacial CO2 decrease and deep-water deoxygenation using our numerical simulation, which successfully reproduces the magnitude and large-scale pattern of the observed oxygen changes from the present to Last Glacial Maximum.“
