Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles
Global ocean biogeochemistry models currently employed in climate change projections use highly simplified representations of pelagic food webs. These food webs do not necessarily include critical pathways by which ecosystems interact with ocean biogeochemistry and climate. Here we present a global...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2016
|
Subjects: | |
Online Access: | https://doi.org/10.5194/bg-13-4111-2016 https://noa.gwlb.de/receive/cop_mods_00011844 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011801/bg-13-4111-2016.pdf https://bg.copernicus.org/articles/13/4111/2016/bg-13-4111-2016.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00011844 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00011844 2023-05-15T18:24:02+02:00 Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles Le Quéré, Corinne Buitenhuis, Erik T. Moriarty, Róisín Alvain, Séverine Aumont, Olivier Bopp, Laurent Chollet, Sophie Enright, Clare Franklin, Daniel J. Geider, Richard J. Harrison, Sandy P. Hirst, Andrew G. Larsen, Stuart Legendre, Louis Platt, Trevor Prentice, I. Colin Rivkin, Richard B. Sailley, Sévrine Sathyendranath, Shubha Stephens, Nick Vogt, Meike Vallina, Sergio M. 2016-07 electronic https://doi.org/10.5194/bg-13-4111-2016 https://noa.gwlb.de/receive/cop_mods_00011844 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011801/bg-13-4111-2016.pdf https://bg.copernicus.org/articles/13/4111/2016/bg-13-4111-2016.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-4111-2016 https://noa.gwlb.de/receive/cop_mods_00011844 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011801/bg-13-4111-2016.pdf https://bg.copernicus.org/articles/13/4111/2016/bg-13-4111-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/bg-13-4111-2016 2022-02-08T22:56:20Z Global ocean biogeochemistry models currently employed in climate change projections use highly simplified representations of pelagic food webs. These food webs do not necessarily include critical pathways by which ecosystems interact with ocean biogeochemistry and climate. Here we present a global biogeochemical model which incorporates ecosystem dynamics based on the representation of ten plankton functional types (PFTs): six types of phytoplankton, three types of zooplankton, and heterotrophic procaryotes. We improved the representation of zooplankton dynamics in our model through (a) the explicit inclusion of large, slow-growing macrozooplankton (e.g. krill), and (b) the introduction of trophic cascades among the three zooplankton types. We use the model to quantitatively assess the relative roles of iron vs. grazing in determining phytoplankton biomass in the Southern Ocean high-nutrient low-chlorophyll (HNLC) region during summer. When model simulations do not include macrozooplankton grazing explicitly, they systematically overestimate Southern Ocean chlorophyll biomass during the summer, even when there is no iron deposition from dust. When model simulations include a slow-growing macrozooplankton and trophic cascades among three zooplankton types, the high-chlorophyll summer bias in the Southern Ocean HNLC region largely disappears. Our model results suggest that the observed low phytoplankton biomass in the Southern Ocean during summer is primarily explained by the dynamics of the Southern Ocean zooplankton community, despite iron limitation of phytoplankton community growth rates. This result has implications for the representation of global biogeochemical cycles in models as zooplankton faecal pellets sink rapidly and partly control the carbon export to the intermediate and deep ocean. Article in Journal/Newspaper Southern Ocean Niedersächsisches Online-Archiv NOA Southern Ocean Biogeosciences 13 14 4111 4133 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Le Quéré, Corinne Buitenhuis, Erik T. Moriarty, Róisín Alvain, Séverine Aumont, Olivier Bopp, Laurent Chollet, Sophie Enright, Clare Franklin, Daniel J. Geider, Richard J. Harrison, Sandy P. Hirst, Andrew G. Larsen, Stuart Legendre, Louis Platt, Trevor Prentice, I. Colin Rivkin, Richard B. Sailley, Sévrine Sathyendranath, Shubha Stephens, Nick Vogt, Meike Vallina, Sergio M. Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles |
topic_facet |
article Verlagsveröffentlichung |
description |
Global ocean biogeochemistry models currently employed in climate change projections use highly simplified representations of pelagic food webs. These food webs do not necessarily include critical pathways by which ecosystems interact with ocean biogeochemistry and climate. Here we present a global biogeochemical model which incorporates ecosystem dynamics based on the representation of ten plankton functional types (PFTs): six types of phytoplankton, three types of zooplankton, and heterotrophic procaryotes. We improved the representation of zooplankton dynamics in our model through (a) the explicit inclusion of large, slow-growing macrozooplankton (e.g. krill), and (b) the introduction of trophic cascades among the three zooplankton types. We use the model to quantitatively assess the relative roles of iron vs. grazing in determining phytoplankton biomass in the Southern Ocean high-nutrient low-chlorophyll (HNLC) region during summer. When model simulations do not include macrozooplankton grazing explicitly, they systematically overestimate Southern Ocean chlorophyll biomass during the summer, even when there is no iron deposition from dust. When model simulations include a slow-growing macrozooplankton and trophic cascades among three zooplankton types, the high-chlorophyll summer bias in the Southern Ocean HNLC region largely disappears. Our model results suggest that the observed low phytoplankton biomass in the Southern Ocean during summer is primarily explained by the dynamics of the Southern Ocean zooplankton community, despite iron limitation of phytoplankton community growth rates. This result has implications for the representation of global biogeochemical cycles in models as zooplankton faecal pellets sink rapidly and partly control the carbon export to the intermediate and deep ocean. |
format |
Article in Journal/Newspaper |
author |
Le Quéré, Corinne Buitenhuis, Erik T. Moriarty, Róisín Alvain, Séverine Aumont, Olivier Bopp, Laurent Chollet, Sophie Enright, Clare Franklin, Daniel J. Geider, Richard J. Harrison, Sandy P. Hirst, Andrew G. Larsen, Stuart Legendre, Louis Platt, Trevor Prentice, I. Colin Rivkin, Richard B. Sailley, Sévrine Sathyendranath, Shubha Stephens, Nick Vogt, Meike Vallina, Sergio M. |
author_facet |
Le Quéré, Corinne Buitenhuis, Erik T. Moriarty, Róisín Alvain, Séverine Aumont, Olivier Bopp, Laurent Chollet, Sophie Enright, Clare Franklin, Daniel J. Geider, Richard J. Harrison, Sandy P. Hirst, Andrew G. Larsen, Stuart Legendre, Louis Platt, Trevor Prentice, I. Colin Rivkin, Richard B. Sailley, Sévrine Sathyendranath, Shubha Stephens, Nick Vogt, Meike Vallina, Sergio M. |
author_sort |
Le Quéré, Corinne |
title |
Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles |
title_short |
Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles |
title_full |
Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles |
title_fullStr |
Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles |
title_full_unstemmed |
Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles |
title_sort |
role of zooplankton dynamics for southern ocean phytoplankton biomass and global biogeochemical cycles |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/bg-13-4111-2016 https://noa.gwlb.de/receive/cop_mods_00011844 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011801/bg-13-4111-2016.pdf https://bg.copernicus.org/articles/13/4111/2016/bg-13-4111-2016.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-4111-2016 https://noa.gwlb.de/receive/cop_mods_00011844 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011801/bg-13-4111-2016.pdf https://bg.copernicus.org/articles/13/4111/2016/bg-13-4111-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-13-4111-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
14 |
container_start_page |
4111 |
op_container_end_page |
4133 |
_version_ |
1766204304839933952 |