Ocean Acidification from Below in the Tropical Pacific

Identifying ocean acidification and its controlling mechanisms is an important priority within the broader question of understanding how sustained anthropogenic CO2 emissions are harming the health of the ocean. Through extensive analysis of observational data products for ocean inorganic carbon, he...

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Published in:Global Biogeochemical Cycles
Main Authors: Ishii, Masao, Rodgers, Keith B., Inoue, Hisayuki Y., Toyama, Katsuya, Sasano, Daisuke, Kosugi, Naohiro, Ono, Hisashi, Enyo, Kazutaka, Nakano, Toshiya, Iudicone, Daniele, Blanke, Bruno, Aumont, Olivier, Feely, Richard A.
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union (AGU) 2020
Subjects:
Online Access:https://archimer.ifremer.fr/doc/00641/75337/76003.pdf
https://doi.org/10.1029/2019GB006368
https://archimer.ifremer.fr/doc/00641/75337/
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spelling ftarchimer:oai:archimer.ifremer.fr:75337 2023-05-15T17:50:13+02:00 Ocean Acidification from Below in the Tropical Pacific Ishii, Masao Rodgers, Keith B. Inoue, Hisayuki Y. Toyama, Katsuya Sasano, Daisuke Kosugi, Naohiro Ono, Hisashi Enyo, Kazutaka Nakano, Toshiya Iudicone, Daniele Blanke, Bruno Aumont, Olivier Feely, Richard A. 2020-08 application/pdf https://archimer.ifremer.fr/doc/00641/75337/76003.pdf https://doi.org/10.1029/2019GB006368 https://archimer.ifremer.fr/doc/00641/75337/ eng eng American Geophysical Union (AGU) https://archimer.ifremer.fr/doc/00641/75337/76003.pdf doi:10.1029/2019GB006368 https://archimer.ifremer.fr/doc/00641/75337/ info:eu-repo/semantics/openAccess restricted use Global Biogeochemical Cycles (0886-6236) (American Geophysical Union (AGU)), 2020-08 , Vol. 34 , N. 8 , P. e2019GB006368 (15p.) text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1029/2019GB006368 2021-09-23T20:35:40Z Identifying ocean acidification and its controlling mechanisms is an important priority within the broader question of understanding how sustained anthropogenic CO2 emissions are harming the health of the ocean. Through extensive analysis of observational data products for ocean inorganic carbon, here we quantify the rate at which acidification is proceeding in the western tropical Pacific Warm Pool, revealing ‐0.0013 ±0.0001 yr‐1 for pH and ‐0.0083±0.0007 yr‐1 for the saturation index of aragonite for the years 1985‐2016. However, the mean rate of total dissolved inorganic carbon increase (+0.81 ±0.06 μmol kg‐1 yr‐1) sustaining acidification was ~20% slower than what would be expected if it were simply controlled by the rate of atmospheric CO2 increase and transmitted through local air‐sea CO2 equilibration. Joint Lagrangian and Eulerian model diagnostics indicate that the acidification of the Warm Pool occurs primarily through the anthropogenic CO2 that invades the ocean in the extra‐tropics, is transported to the tropics through the thermocline shallow overturning circulation, and then re‐emerges into surface waters within the tropics through the Equatorial Undercurrent from below. An interior residence time of several years to decades, acting in conjunction with the accelerating CO2 growth in the atmosphere, can be expected to contribute to modulating the rate of Warm Pool acidification. Key Points Progress of ocean acidification in the western tropical Pacific Warm Pool was identified using the data of oceanic CO2 measurements The rate of oceanic CO2 increase here was ~20% lower than that expected from the growth rate of the mixing ratio of CO2 in the atmosphere Inter‐gyre exchange of anthropogenic CO2 within the thermocline predominantly controls the rate of acidification in this region Article in Journal/Newspaper Ocean acidification Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Pacific Global Biogeochemical Cycles 34 8
institution Open Polar
collection Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
op_collection_id ftarchimer
language English
description Identifying ocean acidification and its controlling mechanisms is an important priority within the broader question of understanding how sustained anthropogenic CO2 emissions are harming the health of the ocean. Through extensive analysis of observational data products for ocean inorganic carbon, here we quantify the rate at which acidification is proceeding in the western tropical Pacific Warm Pool, revealing ‐0.0013 ±0.0001 yr‐1 for pH and ‐0.0083±0.0007 yr‐1 for the saturation index of aragonite for the years 1985‐2016. However, the mean rate of total dissolved inorganic carbon increase (+0.81 ±0.06 μmol kg‐1 yr‐1) sustaining acidification was ~20% slower than what would be expected if it were simply controlled by the rate of atmospheric CO2 increase and transmitted through local air‐sea CO2 equilibration. Joint Lagrangian and Eulerian model diagnostics indicate that the acidification of the Warm Pool occurs primarily through the anthropogenic CO2 that invades the ocean in the extra‐tropics, is transported to the tropics through the thermocline shallow overturning circulation, and then re‐emerges into surface waters within the tropics through the Equatorial Undercurrent from below. An interior residence time of several years to decades, acting in conjunction with the accelerating CO2 growth in the atmosphere, can be expected to contribute to modulating the rate of Warm Pool acidification. Key Points Progress of ocean acidification in the western tropical Pacific Warm Pool was identified using the data of oceanic CO2 measurements The rate of oceanic CO2 increase here was ~20% lower than that expected from the growth rate of the mixing ratio of CO2 in the atmosphere Inter‐gyre exchange of anthropogenic CO2 within the thermocline predominantly controls the rate of acidification in this region
format Article in Journal/Newspaper
author Ishii, Masao
Rodgers, Keith B.
Inoue, Hisayuki Y.
Toyama, Katsuya
Sasano, Daisuke
Kosugi, Naohiro
Ono, Hisashi
Enyo, Kazutaka
Nakano, Toshiya
Iudicone, Daniele
Blanke, Bruno
Aumont, Olivier
Feely, Richard A.
spellingShingle Ishii, Masao
Rodgers, Keith B.
Inoue, Hisayuki Y.
Toyama, Katsuya
Sasano, Daisuke
Kosugi, Naohiro
Ono, Hisashi
Enyo, Kazutaka
Nakano, Toshiya
Iudicone, Daniele
Blanke, Bruno
Aumont, Olivier
Feely, Richard A.
Ocean Acidification from Below in the Tropical Pacific
author_facet Ishii, Masao
Rodgers, Keith B.
Inoue, Hisayuki Y.
Toyama, Katsuya
Sasano, Daisuke
Kosugi, Naohiro
Ono, Hisashi
Enyo, Kazutaka
Nakano, Toshiya
Iudicone, Daniele
Blanke, Bruno
Aumont, Olivier
Feely, Richard A.
author_sort Ishii, Masao
title Ocean Acidification from Below in the Tropical Pacific
title_short Ocean Acidification from Below in the Tropical Pacific
title_full Ocean Acidification from Below in the Tropical Pacific
title_fullStr Ocean Acidification from Below in the Tropical Pacific
title_full_unstemmed Ocean Acidification from Below in the Tropical Pacific
title_sort ocean acidification from below in the tropical pacific
publisher American Geophysical Union (AGU)
publishDate 2020
url https://archimer.ifremer.fr/doc/00641/75337/76003.pdf
https://doi.org/10.1029/2019GB006368
https://archimer.ifremer.fr/doc/00641/75337/
geographic Pacific
geographic_facet Pacific
genre Ocean acidification
genre_facet Ocean acidification
op_source Global Biogeochemical Cycles (0886-6236) (American Geophysical Union (AGU)), 2020-08 , Vol. 34 , N. 8 , P. e2019GB006368 (15p.)
op_relation https://archimer.ifremer.fr/doc/00641/75337/76003.pdf
doi:10.1029/2019GB006368
https://archimer.ifremer.fr/doc/00641/75337/
op_rights info:eu-repo/semantics/openAccess
restricted use
op_doi https://doi.org/10.1029/2019GB006368
container_title Global Biogeochemical Cycles
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