Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification
Planktonic foraminifera from tropical Atlantic and Caribbean sediment-surface samples (0-1 cm) show general westward-directed increasing calcification depths depending on the east-west increase in thermocline depth. Positively related planktonic foraminiferal Mg/Ca and carbonate ion concentration in...
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
2007
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/60135/ https://oceanrep.geomar.de/id/eprint/60135/1/d1962_.pdf https://macau.uni-kiel.de/receive/diss_mods_00001962 |
id |
ftoceanrep:oai:oceanrep.geomar.de:60135 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:60135 2024-04-21T08:10:32+00:00 Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification Regenberg, Marcus 2007 text https://oceanrep.geomar.de/id/eprint/60135/ https://oceanrep.geomar.de/id/eprint/60135/1/d1962_.pdf https://macau.uni-kiel.de/receive/diss_mods_00001962 en eng https://oceanrep.geomar.de/id/eprint/60135/1/d1962_.pdf Regenberg, M. (2007) Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification. Open Access (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, 127 pp. info:eu-repo/semantics/openAccess Thesis NonPeerReviewed 2007 ftoceanrep 2024-03-27T17:48:37Z Planktonic foraminifera from tropical Atlantic and Caribbean sediment-surface samples (0-1 cm) show general westward-directed increasing calcification depths depending on the east-west increase in thermocline depth. Positively related planktonic foraminiferal Mg/Ca and carbonate ion concentration in the Caribbean show well preserved Mg/Ca down to depths about 1.5 km above the lysocline, which equals a carbonate ion concentration of 26-18 µmol/kg. Species-specific calibrations of Mg/Ca with d18O-derived calcification temperatures reveal similar exponential and differing preexponential constants for shallow- and thermocline-dwelling compared to deep-dwelling species. For multispecies, a "warm water" and a "cold water" calibration was derived. Alteration of deep-sea sediments in the vicinity of the Bahama platform results in micro-scale inorganic crystallites on planktonic foraminiferal tests, which synchronize the absence of high Mg-calcite from the sediments. Mg/Ca and Sr/Ca of the crystallites are 4-6 times elevated and 2-3 times depleted, respectively, compared to the original foraminiferal test. Thesis Planktonic foraminifera OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Planktonic foraminifera from tropical Atlantic and Caribbean sediment-surface samples (0-1 cm) show general westward-directed increasing calcification depths depending on the east-west increase in thermocline depth. Positively related planktonic foraminiferal Mg/Ca and carbonate ion concentration in the Caribbean show well preserved Mg/Ca down to depths about 1.5 km above the lysocline, which equals a carbonate ion concentration of 26-18 µmol/kg. Species-specific calibrations of Mg/Ca with d18O-derived calcification temperatures reveal similar exponential and differing preexponential constants for shallow- and thermocline-dwelling compared to deep-dwelling species. For multispecies, a "warm water" and a "cold water" calibration was derived. Alteration of deep-sea sediments in the vicinity of the Bahama platform results in micro-scale inorganic crystallites on planktonic foraminiferal tests, which synchronize the absence of high Mg-calcite from the sediments. Mg/Ca and Sr/Ca of the crystallites are 4-6 times elevated and 2-3 times depleted, respectively, compared to the original foraminiferal test. |
format |
Thesis |
author |
Regenberg, Marcus |
spellingShingle |
Regenberg, Marcus Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification |
author_facet |
Regenberg, Marcus |
author_sort |
Regenberg, Marcus |
title |
Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification |
title_short |
Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification |
title_full |
Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification |
title_fullStr |
Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification |
title_full_unstemmed |
Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification |
title_sort |
inorganic and stable isotope geochemistry of tropical atlantic/caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification |
publishDate |
2007 |
url |
https://oceanrep.geomar.de/id/eprint/60135/ https://oceanrep.geomar.de/id/eprint/60135/1/d1962_.pdf https://macau.uni-kiel.de/receive/diss_mods_00001962 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://oceanrep.geomar.de/id/eprint/60135/1/d1962_.pdf Regenberg, M. (2007) Inorganic and stable isotope geochemistry of tropical Atlantic/Caribbean planktonic foraminifera : implications for the reconstruction of upper ocean temperatures and stratification. Open Access (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, 127 pp. |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1796952023795499008 |