Carbon Export Buffering and CO₂ Drawdown by Flexible Phytoplankton C:N:P Under Glacial Conditions

Abstract

This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Glacial deep ocean deoxygenation driven by biologically mediated air–sea disequilibrium

“…To refine our understanding of glacial-interglacial changes in ocean carbon and oxygen distributions, more extensive seasonal observations of O 2 gas exchange, especially in the Southern Ocean, are required. The magnitude of disequilibrium should also be investigated both in models that do not base respired carbon estimates on AOU and that incorporate recent developments in using flexible stoichiometry [45,46]. The results of recent studies with such models suggest that this may enhance glacial C bio storage [47,46] and may slightly reduce the quota of O 2 required to respire C soft [46], which could alleviate deoxygenation.…”

Toward Determining the Spatio-Temporal Variability of Upper-Ocean Ecosystem Stoichiometry From Satellite Remote Sensing

“…This conclusion has important implications for estimating carbon and phosphorus fluxes to the deep ocean and for the trophic transfer to higher organisms. Indeed, if the POC:POP of exported POM is controlled by community composition rather than phytoplankton C:P, we would not expect large "stoichiometric buffering" of carbon export under climate-change scenarios as proposed by previous studies (Teng et al, 2014;Galbraith and Martiny, 2015;Tanioka and Matsumoto, 2017;Matsumoto et al, 2020a). However, the effects of change in phytoplankton C:P will become more critical for carbon export if the total % of phytoplankton in organic matter increases, or if the C:P of the non-algal component increases.…”

“…As carbon export is inversely related to atmospheric CO 2 (Volk and Hoffert, 1985), carbon-enriched particulate organic matter in subtropical gyres could lead to lower atmospheric CO 2 and higher export production of carbon, thereby influencing climate (Galbraith and Martiny, 2015;Tanioka and Matsumoto, 2017;Matsumoto et al, 2020a;Ödalen et al, 2020). The ocean carbon modeling community is beginning to respond to this development.…”

MESMO 3: Flexible phytoplankton stoichiometry and refractory dissolved organic matter

“…(25)K sp is the solubility product of CaCO 3 . The temperature dependency of CaCO 3 formation (k T ,CaCO 3 ) is similar to that ofMoore et al (2004) where warmer temperatures favor the growth of carbonate-bearing phytoplankton.https://doi.org/10.5194/gmd-14-2265-2021 Geosci. Model Dev., 14, 2265-2288, 2021…”