The Relative Importance of Phytoplankton Light Absorption and Ecosystem Complexity in an Earth System Model

Abstract We investigate the relative importance of ecosystem complexity and phytoplankton light absorption for climate studies. While the complexity of Earth System models (ESMs) with respect to marine biota has increased over the past years, the relative importance of biological processes in drivin...

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Autores principales:	Rémy Asselot, Frank Lunkeit, Philip B. Holden, Inga Hense
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2021
Materias:	cGENIE framework Earth system model ecosystem complexity feedback light absorption marine ecosystem model Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/0a7555ea2679418aa46fadf03dee34b0
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spelling	oai:doaj.org-article:0a7555ea2679418aa46fadf03dee34b02021-11-24T08:11:41ZThe Relative Importance of Phytoplankton Light Absorption and Ecosystem Complexity in an Earth System Model1942-246610.1029/2020MS002110https://doaj.org/article/0a7555ea2679418aa46fadf03dee34b02021-05-01T00:00:00Zhttps://doi.org/10.1029/2020MS002110https://doaj.org/toc/1942-2466Abstract We investigate the relative importance of ecosystem complexity and phytoplankton light absorption for climate studies. While the complexity of Earth System models (ESMs) with respect to marine biota has increased over the past years, the relative importance of biological processes in driving climate‐relevant mechanisms such as the biological carbon pump and phytoplankton light absorption is still unknown. The climate effects of these mechanisms have been studied separately, but not together. To shed light on the role of biologically mediated feedbacks, we performed different model experiments with the EcoGENIE ESM. The model experiments have been conducted with and without phytoplankton light absorption and with two or 12 plankton functional types. For a robust comparison, all simulations are tuned to have the same primary production. Our model experiments show that phytoplankton light absorption changes ocean physics and biogeochemistry. Higher sea surface temperature decreases the solubility of CO2 which in turn increases the atmospheric CO2 concentration, and finally the atmospheric temperature rises by 0.45°C. An increase in ecosystem complexity increases the export production of particulate organic carbon but decreases the amount of dissolved organic matter. These changes in the marine carbon cycling, however, hardly reduces the atmospheric CO2 concentrations and slightly decreases the atmospheric temperature by 0.034°C. Overall we show that phytoplankton light absorption has a higher impact on the carbon cycle and on the climate system than a more detailed representation of the marine biota.Rémy AsselotFrank LunkeitPhilip B. HoldenInga HenseAmerican Geophysical Union (AGU)articlecGENIE frameworkEarth system modelecosystem complexityfeedbacklight absorptionmarine ecosystem modelPhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 13, Iss 5, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cGENIE framework Earth system model ecosystem complexity feedback light absorption marine ecosystem model Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	cGENIE framework Earth system model ecosystem complexity feedback light absorption marine ecosystem model Physical geography GB3-5030 Oceanography GC1-1581 Rémy Asselot Frank Lunkeit Philip B. Holden Inga Hense The Relative Importance of Phytoplankton Light Absorption and Ecosystem Complexity in an Earth System Model
description	Abstract We investigate the relative importance of ecosystem complexity and phytoplankton light absorption for climate studies. While the complexity of Earth System models (ESMs) with respect to marine biota has increased over the past years, the relative importance of biological processes in driving climate‐relevant mechanisms such as the biological carbon pump and phytoplankton light absorption is still unknown. The climate effects of these mechanisms have been studied separately, but not together. To shed light on the role of biologically mediated feedbacks, we performed different model experiments with the EcoGENIE ESM. The model experiments have been conducted with and without phytoplankton light absorption and with two or 12 plankton functional types. For a robust comparison, all simulations are tuned to have the same primary production. Our model experiments show that phytoplankton light absorption changes ocean physics and biogeochemistry. Higher sea surface temperature decreases the solubility of CO2 which in turn increases the atmospheric CO2 concentration, and finally the atmospheric temperature rises by 0.45°C. An increase in ecosystem complexity increases the export production of particulate organic carbon but decreases the amount of dissolved organic matter. These changes in the marine carbon cycling, however, hardly reduces the atmospheric CO2 concentrations and slightly decreases the atmospheric temperature by 0.034°C. Overall we show that phytoplankton light absorption has a higher impact on the carbon cycle and on the climate system than a more detailed representation of the marine biota.
format	article
author	Rémy Asselot Frank Lunkeit Philip B. Holden Inga Hense
author_facet	Rémy Asselot Frank Lunkeit Philip B. Holden Inga Hense
author_sort	Rémy Asselot
title	The Relative Importance of Phytoplankton Light Absorption and Ecosystem Complexity in an Earth System Model
title_short	The Relative Importance of Phytoplankton Light Absorption and Ecosystem Complexity in an Earth System Model
title_full	The Relative Importance of Phytoplankton Light Absorption and Ecosystem Complexity in an Earth System Model
title_fullStr	The Relative Importance of Phytoplankton Light Absorption and Ecosystem Complexity in an Earth System Model
title_full_unstemmed	The Relative Importance of Phytoplankton Light Absorption and Ecosystem Complexity in an Earth System Model
title_sort	relative importance of phytoplankton light absorption and ecosystem complexity in an earth system model
publisher	American Geophysical Union (AGU)
publishDate	2021
url	https://doaj.org/article/0a7555ea2679418aa46fadf03dee34b0
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The Relative Importance of Phytoplankton Light Absorption and Ecosystem Complexity in an Earth System Model

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