Weight estimates of coccoliths using the optical properties (birefringence) of calcite
Workshop on Assessment of Mesozoic Calcareous Nannoplankton Diversity and Evolution, Rutgers Univ, New Brunswick, NJ, DEC, 2003 International audience The coccolithophores are among the few organisms of the phytoplankton to calcify. Although together with the planktonic foraminifera they dominate ca...
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ftcollegfrance:oai:HAL:hal-01460378v1 2024-06-23T07:56:17+00:00 Weight estimates of coccoliths using the optical properties (birefringence) of calcite Beaufort, L. Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2005 https://hal.science/hal-01460378 https://doi.org/10.2113/gsmicropal.51.4.289 en eng HAL CCSD Micropaleontology Press info:eu-repo/semantics/altIdentifier/doi/10.2113/gsmicropal.51.4.289 hal-01460378 https://hal.science/hal-01460378 doi:10.2113/gsmicropal.51.4.289 ISSN: 0026-2803 Micropaleontology https://hal.science/hal-01460378 Micropaleontology, 2005, 51 (4), pp.289-297. ⟨10.2113/gsmicropal.51.4.289⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2005 ftcollegfrance https://doi.org/10.2113/gsmicropal.51.4.289 2024-06-13T23:41:08Z Workshop on Assessment of Mesozoic Calcareous Nannoplankton Diversity and Evolution, Rutgers Univ, New Brunswick, NJ, DEC, 2003 International audience The coccolithophores are among the few organisms of the phytoplankton to calcify. Although together with the planktonic foraminifera they dominate calcite production in the open ocean, the amount of calcite they secrete is difficult to deter-mine. The amount of calcite in the form of coccoliths that is dissolved during sedimentation is also difficult to estimate as is the amount of calcite represented by sedimented coccoliths. Because of their minuteness, coccoliths cannot be directly weighed. Instead. indirect methods must be used to estimate their weight. I describe here a method that allows quick estimations of the weight of individual coccoliths. based on the measure of their brightness when viewed in cross-polarized light. This birefringence method can only be applied to the group Heliolithae (excluding some of the coccoliths produced in the Family Coccolithaceae). For Coccolithaceae and some Ortholithae an estimate of the weight can be made using a correcting factor. The birefringence method is highly reproducible (+/- 0.13pg). However, a significant systematic error of 13.5% may occur when coccoliths with asymmetrical appearance in cross polarized light (e.g., Helicospheara carteri) are not measured in specific orientations. Article in Journal/Newspaper Planktonic foraminifera Collège de France: HAL Micropaleontology 51 4 289 297 |
institution |
Open Polar |
collection |
Collège de France: HAL |
op_collection_id |
ftcollegfrance |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Beaufort, L. Weight estimates of coccoliths using the optical properties (birefringence) of calcite |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
Workshop on Assessment of Mesozoic Calcareous Nannoplankton Diversity and Evolution, Rutgers Univ, New Brunswick, NJ, DEC, 2003 International audience The coccolithophores are among the few organisms of the phytoplankton to calcify. Although together with the planktonic foraminifera they dominate calcite production in the open ocean, the amount of calcite they secrete is difficult to deter-mine. The amount of calcite in the form of coccoliths that is dissolved during sedimentation is also difficult to estimate as is the amount of calcite represented by sedimented coccoliths. Because of their minuteness, coccoliths cannot be directly weighed. Instead. indirect methods must be used to estimate their weight. I describe here a method that allows quick estimations of the weight of individual coccoliths. based on the measure of their brightness when viewed in cross-polarized light. This birefringence method can only be applied to the group Heliolithae (excluding some of the coccoliths produced in the Family Coccolithaceae). For Coccolithaceae and some Ortholithae an estimate of the weight can be made using a correcting factor. The birefringence method is highly reproducible (+/- 0.13pg). However, a significant systematic error of 13.5% may occur when coccoliths with asymmetrical appearance in cross polarized light (e.g., Helicospheara carteri) are not measured in specific orientations. |
author2 |
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Beaufort, L. |
author_facet |
Beaufort, L. |
author_sort |
Beaufort, L. |
title |
Weight estimates of coccoliths using the optical properties (birefringence) of calcite |
title_short |
Weight estimates of coccoliths using the optical properties (birefringence) of calcite |
title_full |
Weight estimates of coccoliths using the optical properties (birefringence) of calcite |
title_fullStr |
Weight estimates of coccoliths using the optical properties (birefringence) of calcite |
title_full_unstemmed |
Weight estimates of coccoliths using the optical properties (birefringence) of calcite |
title_sort |
weight estimates of coccoliths using the optical properties (birefringence) of calcite |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-01460378 https://doi.org/10.2113/gsmicropal.51.4.289 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
ISSN: 0026-2803 Micropaleontology https://hal.science/hal-01460378 Micropaleontology, 2005, 51 (4), pp.289-297. ⟨10.2113/gsmicropal.51.4.289⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.2113/gsmicropal.51.4.289 hal-01460378 https://hal.science/hal-01460378 doi:10.2113/gsmicropal.51.4.289 |
op_doi |
https://doi.org/10.2113/gsmicropal.51.4.289 |
container_title |
Micropaleontology |
container_volume |
51 |
container_issue |
4 |
container_start_page |
289 |
op_container_end_page |
297 |
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1802649277798809600 |