Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump
Accurate predictive modeling of the ocean's global carbon and oxygen cycles is challenging because of uncertainties in both biogeochemistry and ocean circulation. Advances over the last decade have made parameter optimization feasible, allowing models to better match observed biogeochemical fie...
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Copernicus Publications
2023
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Online Access: | http://hdl.handle.net/1959.4/unsworks_84145 https://doi.org/10.5194/bg-20-2985-2023 |
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_84145 2024-05-12T08:11:26+00:00 Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump Pasquier, B Holzer, M Chamberlain, MA Matear, RJ Bindoff, NL Primeau, FW 2023-07-26 http://hdl.handle.net/1959.4/unsworks_84145 https://doi.org/10.5194/bg-20-2985-2023 unknown Copernicus Publications http://purl.org/au-research/grants/arc/DP210101650 http://hdl.handle.net/1959.4/unsworks_84145 https://doi.org/10.5194/bg-20-2985-2023 metadata only access http://purl.org/coar/access_right/c_14cb CC-BY https://creativecommons.org/licenses/by/4.0/ urn:ISSN:1726-4170 urn:ISSN:1726-4189 Biogeosciences, 20, 14, 2985-3009 14 Life Below Water anzsrc-for: 04 Earth Sciences anzsrc-for: 05 Environmental Sciences anzsrc-for: 06 Biological Sciences journal article http://purl.org/coar/resource_type/c_6501 2023 ftunswworks https://doi.org/10.5194/bg-20-2985-2023 2024-04-17T15:10:12Z Accurate predictive modeling of the ocean's global carbon and oxygen cycles is challenging because of uncertainties in both biogeochemistry and ocean circulation. Advances over the last decade have made parameter optimization feasible, allowing models to better match observed biogeochemical fields. However, does fitting a biogeochemical model to observed tracers using a circulation with known biases robustly capture the inner workings of the biological pump? Here we embed a mechanistic model of the ocean's coupled nutrient, carbon, and oxygen cycles into two circulations for the current climate. To assess the effects of biases, one circulation (ACCESS-M) is derived from a climate model and the other from data assimilation of observations (OCIM2). We find that parameter optimization compensates for circulation biases at the expense of altering how the biological pump operates. Tracer observations constrain pump strength and regenerated inventories for both circulations, but ACCESS-M export production optimizes to twice that of OCIM2 to compensate for ACCESS-M having lower sequestration efficiencies driven by less efficient particle transfer and shorter residence times. Idealized simulations forcing complete Southern Ocean nutrient utilization show that the response of the optimized system is sensitive to the embedding circulation. In ACCESS-M, Southern Ocean nutrient and dissolved inorganic carbon (DIC) trapping is partially short circuited by unrealistically deep mixed layers. For both circulations, intense Southern Ocean production deoxygenates Southern-Ocean-sourced deep waters, muting the imprint of circulation biases on oxygen. Our findings highlight that the biological pump's plumbing needs careful assessment to predict the biogeochemical response to ecological changes, even when optimally matching observations. Article in Journal/Newspaper Southern Ocean UNSW Sydney (The University of New South Wales): UNSWorks Southern Ocean Biogeosciences 20 14 2985 3009 |
institution |
Open Polar |
collection |
UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
14 Life Below Water anzsrc-for: 04 Earth Sciences anzsrc-for: 05 Environmental Sciences anzsrc-for: 06 Biological Sciences |
spellingShingle |
14 Life Below Water anzsrc-for: 04 Earth Sciences anzsrc-for: 05 Environmental Sciences anzsrc-for: 06 Biological Sciences Pasquier, B Holzer, M Chamberlain, MA Matear, RJ Bindoff, NL Primeau, FW Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump |
topic_facet |
14 Life Below Water anzsrc-for: 04 Earth Sciences anzsrc-for: 05 Environmental Sciences anzsrc-for: 06 Biological Sciences |
description |
Accurate predictive modeling of the ocean's global carbon and oxygen cycles is challenging because of uncertainties in both biogeochemistry and ocean circulation. Advances over the last decade have made parameter optimization feasible, allowing models to better match observed biogeochemical fields. However, does fitting a biogeochemical model to observed tracers using a circulation with known biases robustly capture the inner workings of the biological pump? Here we embed a mechanistic model of the ocean's coupled nutrient, carbon, and oxygen cycles into two circulations for the current climate. To assess the effects of biases, one circulation (ACCESS-M) is derived from a climate model and the other from data assimilation of observations (OCIM2). We find that parameter optimization compensates for circulation biases at the expense of altering how the biological pump operates. Tracer observations constrain pump strength and regenerated inventories for both circulations, but ACCESS-M export production optimizes to twice that of OCIM2 to compensate for ACCESS-M having lower sequestration efficiencies driven by less efficient particle transfer and shorter residence times. Idealized simulations forcing complete Southern Ocean nutrient utilization show that the response of the optimized system is sensitive to the embedding circulation. In ACCESS-M, Southern Ocean nutrient and dissolved inorganic carbon (DIC) trapping is partially short circuited by unrealistically deep mixed layers. For both circulations, intense Southern Ocean production deoxygenates Southern-Ocean-sourced deep waters, muting the imprint of circulation biases on oxygen. Our findings highlight that the biological pump's plumbing needs careful assessment to predict the biogeochemical response to ecological changes, even when optimally matching observations. |
format |
Article in Journal/Newspaper |
author |
Pasquier, B Holzer, M Chamberlain, MA Matear, RJ Bindoff, NL Primeau, FW |
author_facet |
Pasquier, B Holzer, M Chamberlain, MA Matear, RJ Bindoff, NL Primeau, FW |
author_sort |
Pasquier, B |
title |
Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump |
title_short |
Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump |
title_full |
Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump |
title_fullStr |
Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump |
title_full_unstemmed |
Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump |
title_sort |
optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
http://hdl.handle.net/1959.4/unsworks_84145 https://doi.org/10.5194/bg-20-2985-2023 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
urn:ISSN:1726-4170 urn:ISSN:1726-4189 Biogeosciences, 20, 14, 2985-3009 |
op_relation |
http://purl.org/au-research/grants/arc/DP210101650 http://hdl.handle.net/1959.4/unsworks_84145 https://doi.org/10.5194/bg-20-2985-2023 |
op_rights |
metadata only access http://purl.org/coar/access_right/c_14cb CC-BY https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5194/bg-20-2985-2023 |
container_title |
Biogeosciences |
container_volume |
20 |
container_issue |
14 |
container_start_page |
2985 |
op_container_end_page |
3009 |
_version_ |
1798855148941869056 |