Artículo
Vertical imbalance in organic carbon budgets is indicative of a missing vertical transfer during a phytoplankton bloom near South Georgia (COMICS)
Autor/es | Giering, Sarah Lou Carolin
Sanders, Richard Blackbird, Sabena Briggs, Nathan Carvalho, Filipa East, H. Espinola, Benoit Henson, Stephanie A. Kiriakoulakis, Kostas Iversen, Morten H. Lampitt, Richard S. Pabortsava, Katsiaryna Pebody, Corinne Peel, Kate Preece, Calum Saw, Kevin Villa Alfageme, María Wolff, George A. |
Departamento | Universidad de Sevilla. Departamento de Física Aplicada II |
Fecha de publicación | 2023-06 |
Fecha de depósito | 2023-07-20 |
Publicado en |
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Resumen | The biological carbon pump, driven principally by the surface production of sinking organic matter and its subsequent remineralization to carbon dioxide (CO2) in the deep ocean, maintains atmospheric CO2 concentrations ... The biological carbon pump, driven principally by the surface production of sinking organic matter and its subsequent remineralization to carbon dioxide (CO2) in the deep ocean, maintains atmospheric CO2 concentrations around 200 ppm lower than they would be if the ocean were abiotic. One important driver of the magnitude of this effect is the depth to which organic matter sinks before it is remineralised, a parameter we have limited confidence in measuring given the difficulty involved in balancing sources and sinks in the ocean's interior. One solution to this imbalance might be a temporal offset in which organic carbon accumulates in the mesopelagic zone (100–1000 m depth) early in the productive season before it is consumed later. Here, we develop a novel accounting method to address non-steady state conditions by estimating fluxes of particulate organic matter into, and accumulation within, distinct vertical layers in the mesopelagic zone using high-resolution spatiotemporal vertical profiles. We apply this approach to a time series of measurements made during the declining phase of a large diatom bloom in a low-circulation region of the Southern Ocean downstream of South Georgia. Our data show that the major export event led to a significant accumulation of organic matter in the upper mesopelagic zone (100–200 m depth) which declined over the following weeks, implying that temporal offsets need to be considered when compiling budgets. However, even when accounting for this accumulation, a mismatch in the vertically resolved organic carbon budget remained, implying that there are likely widespread processes that we do not yet understand that redistribute material vertically within the mesopelagic zone. |
Agencias financiadoras | Natural Environment Research Council (UK) European Research Council Consolidator South Africa’s Department of Science and Innovation South African National Research Foundation Junta de Andalucía |
Identificador del proyecto | NE/M020835/1
724416 DST/CON0182/2017 SNA170522231782 TRACECARBON-P20_01217 |
Cita | Giering, S.L.C., Sanders, R., Blackbird, S., Briggs, ., Carvalho, ., East, H.,...,Wolff, .A. (2023). Vertical imbalance in organic carbon budgets is indicative of a missing vertical transfer during a phytoplankton bloom near South Georgia (COMICS). Deep Sea Research Part II: Topical Studies in Oceanography, 209 (105277). https://doi.org/10.1016/j.dsr2.2023.105277. |
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