Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector)
Twenty-five surficial sediment samples, collected on board ORV Sagar Kanya during her 199th and 200th cruises along a north-south transect betweenlatitudes 9.69°N and 55.01°S, and longitudes 80°E and 40°E were studied for isotopic variations (values of Δ 18 O and Δ 13 C) of the indicator planktonic...
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ftdoajarticles:oai:doaj.org/article:826f3acab3d945fbb4ee26d1b1e48b99 2023-05-15T18:25:17+02:00 Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector) Kumar Chaturvedi Neloy Khare Subodh 2012-04-01T00:00:00Z https://doaj.org/article/826f3acab3d945fbb4ee26d1b1e48b99 EN eng Elsevier http://www.iopan.gda.pl/oceanologia/54_2.html#A8 https://doaj.org/toc/0078-3234 0078-3234 https://doaj.org/article/826f3acab3d945fbb4ee26d1b1e48b99 Oceanologia, Vol 54, Iss 2, Pp 311-323 (2012) Foraminifera Globigerina bulloides Stable isotopes Southern Ocean Frontal systems Oceanography GC1-1581 article 2012 ftdoajarticles 2022-12-30T20:59:57Z Twenty-five surficial sediment samples, collected on board ORV Sagar Kanya during her 199th and 200th cruises along a north-south transect betweenlatitudes 9.69°N and 55.01°S, and longitudes 80°E and 40°E were studied for isotopic variations (values of Δ 18 O and Δ 13 C) of the indicator planktonic species Globigerina bulloides . The results indicate that from latitudes 9.69°N to 15°S both these isotopes (Δ 18 O and Δ 13 C) fluctuated significantly. Between latitudes from around15°S to 30-35°S Δ 18 O values steadily increased, whereas $delta^{13}$C showed a decreasing trend. However, to the south of latitudes 30-35°S, both isotope values showed a similar response with a gradual increase up to latitude 50°S,beyond which $delta^{18}$O continued to increase while $delta^{13}$C declined. The characteristic patterns of the values of both isotopes indicatesthat the signatures of different water masses are associated with various frontal systems and/or water masses across the transect. The signature ofthe Polar Front at around latitude 50^{circ}S shows the specific response of the isotopic values (Δ 18 O and Δ 13 C) of G. bulloides . Such a response beyond 50°S latitude is ascribable to the general decrease in the ambient temperature, resultingin a continuous increase in Δ 18 O values, while Δ 13 C values decrease as a result of reduced photosynthesis in regions approaching higherlatitudes owing to low light penetration. To further corroborate our results, those of many such transects from geographically distinct regions need to bestudied for isotopic variations in the calcareous shells of planktonic foraminiferal species. The results have the potential to be used as a proxy to assess the movement of frontal systems in southern high latitude regions. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Indian |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Foraminifera Globigerina bulloides Stable isotopes Southern Ocean Frontal systems Oceanography GC1-1581 |
spellingShingle |
Foraminifera Globigerina bulloides Stable isotopes Southern Ocean Frontal systems Oceanography GC1-1581 Kumar Chaturvedi Neloy Khare Subodh Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector) |
topic_facet |
Foraminifera Globigerina bulloides Stable isotopes Southern Ocean Frontal systems Oceanography GC1-1581 |
description |
Twenty-five surficial sediment samples, collected on board ORV Sagar Kanya during her 199th and 200th cruises along a north-south transect betweenlatitudes 9.69°N and 55.01°S, and longitudes 80°E and 40°E were studied for isotopic variations (values of Δ 18 O and Δ 13 C) of the indicator planktonic species Globigerina bulloides . The results indicate that from latitudes 9.69°N to 15°S both these isotopes (Δ 18 O and Δ 13 C) fluctuated significantly. Between latitudes from around15°S to 30-35°S Δ 18 O values steadily increased, whereas $delta^{13}$C showed a decreasing trend. However, to the south of latitudes 30-35°S, both isotope values showed a similar response with a gradual increase up to latitude 50°S,beyond which $delta^{18}$O continued to increase while $delta^{13}$C declined. The characteristic patterns of the values of both isotopes indicatesthat the signatures of different water masses are associated with various frontal systems and/or water masses across the transect. The signature ofthe Polar Front at around latitude 50^{circ}S shows the specific response of the isotopic values (Δ 18 O and Δ 13 C) of G. bulloides . Such a response beyond 50°S latitude is ascribable to the general decrease in the ambient temperature, resultingin a continuous increase in Δ 18 O values, while Δ 13 C values decrease as a result of reduced photosynthesis in regions approaching higherlatitudes owing to low light penetration. To further corroborate our results, those of many such transects from geographically distinct regions need to bestudied for isotopic variations in the calcareous shells of planktonic foraminiferal species. The results have the potential to be used as a proxy to assess the movement of frontal systems in southern high latitude regions. |
format |
Article in Journal/Newspaper |
author |
Kumar Chaturvedi Neloy Khare Subodh |
author_facet |
Kumar Chaturvedi Neloy Khare Subodh |
author_sort |
Kumar Chaturvedi |
title |
Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector) |
title_short |
Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector) |
title_full |
Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector) |
title_fullStr |
Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector) |
title_full_unstemmed |
Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector) |
title_sort |
tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species globigerina bulloides in the southern ocean (indian sector) |
publisher |
Elsevier |
publishDate |
2012 |
url |
https://doaj.org/article/826f3acab3d945fbb4ee26d1b1e48b99 |
geographic |
Southern Ocean Indian |
geographic_facet |
Southern Ocean Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Oceanologia, Vol 54, Iss 2, Pp 311-323 (2012) |
op_relation |
http://www.iopan.gda.pl/oceanologia/54_2.html#A8 https://doaj.org/toc/0078-3234 0078-3234 https://doaj.org/article/826f3acab3d945fbb4ee26d1b1e48b99 |
_version_ |
1766206602193403904 |