Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap
Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 1996 The relationship of planktonic foraminiferal populations and stable isotopes to synoptic sea surface temperature...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
1996
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/5673 2023-05-15T18:01:01+02:00 Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap Alderman, Susan E. 53°19'N, 149°50'E 1996-05 application/pdf https://hdl.handle.net/1912/5673 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/5673 doi:10.1575/1912/5673 doi:10.1575/1912/5673 Marine plankton Ocean temperature Thesis 1996 ftwhoas https://doi.org/10.1575/1912/5673 2022-05-28T22:58:45Z Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 1996 The relationship of planktonic foraminiferal populations and stable isotopes to synoptic sea surface temperatures (SST's) was examined in the Sea of Okhotsk, using sediment trap samples (trap deployed Aug. '90 - Aug. '91; 53°19'N, 149°50'E) and AVHRR satellite sea surface temperature data. Synoptic SST's for the deployment ranged between -1.2 and 14.8°C. Two species dominated total yearly foraminiferal flux: N. pachyderma (left) and G. bulloides, with 57% and 31% of yearly flux, respectively. Calcification depths (from δ180eq. calcite) for these species ranged between 20 and 40 meters. Due to the highly stratified water column in the Sea of Okhotsk, these foraminifera experienced temperatures much colder than SST, and use of standard paleotemperature proxies significantly underestimates SST. The average paleotemperatures calculated from both δ180pachy and δ18Dbull were 5-6°C lower than average synoptic SST. Faunal indicators were consistent with this finding, with the N. pachyderma left-to-right coiling ratios >98% for the entire trap deployment. These ratios would suggest maximum seasonal SST's no greater than 10°C, nearly 5°C colder than the actual sea surface temperature maximum. The results from this study indicate that in highly stratified water columns, standard paleotemperature proxies may yield results as much as 5°C cooler than actual sea surface conditions. Thesis Planktonic foraminifera Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Okhotsk Woods Hole, MA |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Marine plankton Ocean temperature |
spellingShingle |
Marine plankton Ocean temperature Alderman, Susan E. Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap |
topic_facet |
Marine plankton Ocean temperature |
description |
Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 1996 The relationship of planktonic foraminiferal populations and stable isotopes to synoptic sea surface temperatures (SST's) was examined in the Sea of Okhotsk, using sediment trap samples (trap deployed Aug. '90 - Aug. '91; 53°19'N, 149°50'E) and AVHRR satellite sea surface temperature data. Synoptic SST's for the deployment ranged between -1.2 and 14.8°C. Two species dominated total yearly foraminiferal flux: N. pachyderma (left) and G. bulloides, with 57% and 31% of yearly flux, respectively. Calcification depths (from δ180eq. calcite) for these species ranged between 20 and 40 meters. Due to the highly stratified water column in the Sea of Okhotsk, these foraminifera experienced temperatures much colder than SST, and use of standard paleotemperature proxies significantly underestimates SST. The average paleotemperatures calculated from both δ180pachy and δ18Dbull were 5-6°C lower than average synoptic SST. Faunal indicators were consistent with this finding, with the N. pachyderma left-to-right coiling ratios >98% for the entire trap deployment. These ratios would suggest maximum seasonal SST's no greater than 10°C, nearly 5°C colder than the actual sea surface temperature maximum. The results from this study indicate that in highly stratified water columns, standard paleotemperature proxies may yield results as much as 5°C cooler than actual sea surface conditions. |
format |
Thesis |
author |
Alderman, Susan E. |
author_facet |
Alderman, Susan E. |
author_sort |
Alderman, Susan E. |
title |
Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap |
title_short |
Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap |
title_full |
Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap |
title_fullStr |
Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap |
title_full_unstemmed |
Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap |
title_sort |
planktonic foraminifera in the sea of okhotsk : population and stable isotopic analysis from a sediment trap |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
1996 |
url |
https://hdl.handle.net/1912/5673 |
op_coverage |
53°19'N, 149°50'E |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
doi:10.1575/1912/5673 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/5673 doi:10.1575/1912/5673 |
op_doi |
https://doi.org/10.1575/1912/5673 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766170319585804288 |