Decrease in coccolithophore calcification and CO2 since the middle Miocene
Marine algae are instrumental in carbon cycling and atmospheric carbon dioxide (CO2) regulation. One group, coccolithophores, uses carbon to photosynthesize and to calcify, covering their cells with chalk platelets (coccoliths). How ocean acidification influences coccolithophore calcification is str...
Main Authors: | , , , , , , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
University of New Hampshire Scholars' Repository
2016
|
Subjects: | |
Online Access: | https://scholars.unh.edu/faculty_pubs/519 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1518&context=faculty_pubs |
id |
ftuninhampshire:oai:scholars.unh.edu:faculty_pubs-1518 |
---|---|
record_format |
openpolar |
spelling |
ftuninhampshire:oai:scholars.unh.edu:faculty_pubs-1518 2023-05-15T17:51:03+02:00 Decrease in coccolithophore calcification and CO2 since the middle Miocene Bolton, Clara T. Hernandez-Sanchez, Maria T. Fuertes, Miguel-Angel Gonzalez-Lemos, Saul Abrevaya, Lorena Mendez-Vicente, Ana Flores, Jose-Abel Probert, Ian Giosan, Liviu Johnson, Joel E. Stoll, Heather M. 2016-01-14T08:00:00Z application/pdf https://scholars.unh.edu/faculty_pubs/519 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1518&context=faculty_pubs unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/faculty_pubs/519 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1518&context=faculty_pubs http://creativecommons.org/licenses/by-sa/4.0/ CC-BY-SA Faculty Publications text 2016 ftuninhampshire 2023-01-30T21:50:25Z Marine algae are instrumental in carbon cycling and atmospheric carbon dioxide (CO2) regulation. One group, coccolithophores, uses carbon to photosynthesize and to calcify, covering their cells with chalk platelets (coccoliths). How ocean acidification influences coccolithophore calcification is strongly debated, and the effects of carbonate chemistry changes in the geological past are poorly understood. This paper relates degree of coccolith calcification to cellular calcification, and presents the first records of size-normalized coccolith thickness spanning the last 14 Myr from tropical oceans. Degree of calcification was highest in the low-pH, high-CO2 Miocene ocean, but decreased significantly between 6 and 4 Myr ago. Based on this and concurrent trends in a new alkenone ɛp record, we propose that decreasing CO2 partly drove the observed trend via reduced cellular bicarbonate allocation to calcification. This trend reversed in the late Pleistocene despite low CO2, suggesting an additional regulator of calcification such as alkalinity. Text Ocean acidification University of New Hampshire: Scholars Repository |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
description |
Marine algae are instrumental in carbon cycling and atmospheric carbon dioxide (CO2) regulation. One group, coccolithophores, uses carbon to photosynthesize and to calcify, covering their cells with chalk platelets (coccoliths). How ocean acidification influences coccolithophore calcification is strongly debated, and the effects of carbonate chemistry changes in the geological past are poorly understood. This paper relates degree of coccolith calcification to cellular calcification, and presents the first records of size-normalized coccolith thickness spanning the last 14 Myr from tropical oceans. Degree of calcification was highest in the low-pH, high-CO2 Miocene ocean, but decreased significantly between 6 and 4 Myr ago. Based on this and concurrent trends in a new alkenone ɛp record, we propose that decreasing CO2 partly drove the observed trend via reduced cellular bicarbonate allocation to calcification. This trend reversed in the late Pleistocene despite low CO2, suggesting an additional regulator of calcification such as alkalinity. |
format |
Text |
author |
Bolton, Clara T. Hernandez-Sanchez, Maria T. Fuertes, Miguel-Angel Gonzalez-Lemos, Saul Abrevaya, Lorena Mendez-Vicente, Ana Flores, Jose-Abel Probert, Ian Giosan, Liviu Johnson, Joel E. Stoll, Heather M. |
spellingShingle |
Bolton, Clara T. Hernandez-Sanchez, Maria T. Fuertes, Miguel-Angel Gonzalez-Lemos, Saul Abrevaya, Lorena Mendez-Vicente, Ana Flores, Jose-Abel Probert, Ian Giosan, Liviu Johnson, Joel E. Stoll, Heather M. Decrease in coccolithophore calcification and CO2 since the middle Miocene |
author_facet |
Bolton, Clara T. Hernandez-Sanchez, Maria T. Fuertes, Miguel-Angel Gonzalez-Lemos, Saul Abrevaya, Lorena Mendez-Vicente, Ana Flores, Jose-Abel Probert, Ian Giosan, Liviu Johnson, Joel E. Stoll, Heather M. |
author_sort |
Bolton, Clara T. |
title |
Decrease in coccolithophore calcification and CO2 since the middle Miocene |
title_short |
Decrease in coccolithophore calcification and CO2 since the middle Miocene |
title_full |
Decrease in coccolithophore calcification and CO2 since the middle Miocene |
title_fullStr |
Decrease in coccolithophore calcification and CO2 since the middle Miocene |
title_full_unstemmed |
Decrease in coccolithophore calcification and CO2 since the middle Miocene |
title_sort |
decrease in coccolithophore calcification and co2 since the middle miocene |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2016 |
url |
https://scholars.unh.edu/faculty_pubs/519 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1518&context=faculty_pubs |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Faculty Publications |
op_relation |
https://scholars.unh.edu/faculty_pubs/519 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1518&context=faculty_pubs |
op_rights |
http://creativecommons.org/licenses/by-sa/4.0/ |
op_rightsnorm |
CC-BY-SA |
_version_ |
1766158051231924224 |