Planktic foraminiferal dissolution in the twilight zone

Calcite dissolution of planktic foraminifers that settle from the surface ocean to depths has been assessed using the weight/size relationship of tests and correlated to carbonate ion concentration of ambient sea water. Globigerina bulloides and Globigerinita glutinata were sampled from the North At...

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Published in:Deep Sea Research Part II: Topical Studies in Oceanography
Main Authors: Schiebel, R., Barker, Stephen, Lendt, R., Thomas, H., Bollmann, J.
Format: Article in Journal/Newspaper
Language:unknown
Published: Elsevier 2007
Subjects:
Online Access:https://orca.cardiff.ac.uk/id/eprint/11140/
https://doi.org/10.1016/j.dsr2.2007.01.009
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spelling ftunivcardiff:oai:https://orca.cardiff.ac.uk:11140 2023-05-15T17:35:13+02:00 Planktic foraminiferal dissolution in the twilight zone Schiebel, R. Barker, Stephen Lendt, R. Thomas, H. Bollmann, J. 2007 https://orca.cardiff.ac.uk/id/eprint/11140/ https://doi.org/10.1016/j.dsr2.2007.01.009 unknown Elsevier Schiebel, R., Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431, Lendt, R., Thomas, H. and Bollmann, J. 2007. Planktic foraminiferal dissolution in the twilight zone. Deep-Sea Research. Part II.Topical studies in oceanography 54 (5-7) , pp. 676-686. 10.1016/j.dsr2.2007.01.009 https://doi.org/10.1016/j.dsr2.2007.01.009 doi:10.1016/j.dsr2.2007.01.009 GC Oceanography QE Geology Article PeerReviewed 2007 ftunivcardiff https://doi.org/10.1016/j.dsr2.2007.01.009 2022-10-20T22:34:33Z Calcite dissolution of planktic foraminifers that settle from the surface ocean to depths has been assessed using the weight/size relationship of tests and correlated to carbonate ion concentration of ambient sea water. Globigerina bulloides and Globigerinita glutinata were sampled from the North Atlantic and the Arabian Sea during different seasons (spring and fall and the monsoons, respectively). Test weight has been determined for single tests from narrow size classes ( and minimum test diameter). Initial test weight of both species in surface waters differs between regions and seasons. Weight loss of settling tests in the twilight zone between 100 and 1000 m water depths averaged 19%. Below the twilight zone (1000–2500 m) no weight loss occurs on average, and tests may even gain weight. Remineralization of settling planktic foraminiferal tests is most pronounced at maximum . Accordingly, strong dissolution occurs in the twilight zone, at the depth of maximum decrease in . It is assumed that dissolution of planktic foraminiferal calcite is caused by (under-) saturation inside the test, buffered by diffusive exchange of ions with the ambient sea water through the pores and aperture. Consequently, reconstruction of small-scale differences in seawater from test weight alone is not feasible and systematic correlation between test weight and of the ambient sea water is statistically not significant. At constant , remineralization cannot be deduced from test weight, neither at high nor low saturation. In total, our data suggest that the global vertical planktic foraminiferal CaCO3 flux is about 19% lower than calculated by Schiebel [2002. Planktic foraminiferal sedimentation and the marine calcite budget. Global Biogeochemical Cycles, 16 (4), 1065 [doi:10.1029/2001GB001459]]. Article in Journal/Newspaper North Atlantic Cardiff University: ORCA (Online Research @ Cardiff) Deep Sea Research Part II: Topical Studies in Oceanography 54 5-7 676 686
institution Open Polar
collection Cardiff University: ORCA (Online Research @ Cardiff)
op_collection_id ftunivcardiff
language unknown
topic GC Oceanography
QE Geology
spellingShingle GC Oceanography
QE Geology
Schiebel, R.
Barker, Stephen
Lendt, R.
Thomas, H.
Bollmann, J.
Planktic foraminiferal dissolution in the twilight zone
topic_facet GC Oceanography
QE Geology
description Calcite dissolution of planktic foraminifers that settle from the surface ocean to depths has been assessed using the weight/size relationship of tests and correlated to carbonate ion concentration of ambient sea water. Globigerina bulloides and Globigerinita glutinata were sampled from the North Atlantic and the Arabian Sea during different seasons (spring and fall and the monsoons, respectively). Test weight has been determined for single tests from narrow size classes ( and minimum test diameter). Initial test weight of both species in surface waters differs between regions and seasons. Weight loss of settling tests in the twilight zone between 100 and 1000 m water depths averaged 19%. Below the twilight zone (1000–2500 m) no weight loss occurs on average, and tests may even gain weight. Remineralization of settling planktic foraminiferal tests is most pronounced at maximum . Accordingly, strong dissolution occurs in the twilight zone, at the depth of maximum decrease in . It is assumed that dissolution of planktic foraminiferal calcite is caused by (under-) saturation inside the test, buffered by diffusive exchange of ions with the ambient sea water through the pores and aperture. Consequently, reconstruction of small-scale differences in seawater from test weight alone is not feasible and systematic correlation between test weight and of the ambient sea water is statistically not significant. At constant , remineralization cannot be deduced from test weight, neither at high nor low saturation. In total, our data suggest that the global vertical planktic foraminiferal CaCO3 flux is about 19% lower than calculated by Schiebel [2002. Planktic foraminiferal sedimentation and the marine calcite budget. Global Biogeochemical Cycles, 16 (4), 1065 [doi:10.1029/2001GB001459]].
format Article in Journal/Newspaper
author Schiebel, R.
Barker, Stephen
Lendt, R.
Thomas, H.
Bollmann, J.
author_facet Schiebel, R.
Barker, Stephen
Lendt, R.
Thomas, H.
Bollmann, J.
author_sort Schiebel, R.
title Planktic foraminiferal dissolution in the twilight zone
title_short Planktic foraminiferal dissolution in the twilight zone
title_full Planktic foraminiferal dissolution in the twilight zone
title_fullStr Planktic foraminiferal dissolution in the twilight zone
title_full_unstemmed Planktic foraminiferal dissolution in the twilight zone
title_sort planktic foraminiferal dissolution in the twilight zone
publisher Elsevier
publishDate 2007
url https://orca.cardiff.ac.uk/id/eprint/11140/
https://doi.org/10.1016/j.dsr2.2007.01.009
genre North Atlantic
genre_facet North Atlantic
op_relation Schiebel, R., Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431, Lendt, R., Thomas, H. and Bollmann, J. 2007. Planktic foraminiferal dissolution in the twilight zone. Deep-Sea Research. Part II.Topical studies in oceanography 54 (5-7) , pp. 676-686. 10.1016/j.dsr2.2007.01.009 https://doi.org/10.1016/j.dsr2.2007.01.009
doi:10.1016/j.dsr2.2007.01.009
op_doi https://doi.org/10.1016/j.dsr2.2007.01.009
container_title Deep Sea Research Part II: Topical Studies in Oceanography
container_volume 54
container_issue 5-7
container_start_page 676
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