Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean
Oxygen and carbon isotope ratios in planktonic foraminifera Globigerina bulloides collected from tow samples along a transect from the equatorial Indian ocean to the Southern Ocean (45 degrees E and 80 degrees E and 10 degrees N to 53 degrees S) were analysed and compared with the equilibrium delta...
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Online Access: | http://eprints.iisc.ernet.in/53462/ http://eprints.iisc.ernet.in/53462/1/Sci_Rep_6_21533_2016.pdf https://doi.org/10.1038/srep21533 |
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ftiiscindia:oai:eprints.iisc.ernet.in:53462 2023-05-15T18:00:59+02:00 Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean Prasanna, K Ghosh, Prosenjit Bhattacharya, SK Mohan, K Anilkumar, N 2016 application/pdf http://eprints.iisc.ernet.in/53462/ http://eprints.iisc.ernet.in/53462/1/Sci_Rep_6_21533_2016.pdf https://doi.org/10.1038/srep21533 unknown NATURE PUBLISHING GROUP http://eprints.iisc.ernet.in/53462/1/Sci_Rep_6_21533_2016.pdf Prasanna, K and Ghosh, Prosenjit and Bhattacharya, SK and Mohan, K and Anilkumar, N (2016) Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean. In: SCIENTIFIC REPORTS, 6 . Centre for Earth Sciences Journal Article PeerReviewed 2016 ftiiscindia https://doi.org/10.1038/srep21533 2016-04-15T22:13:29Z Oxygen and carbon isotope ratios in planktonic foraminifera Globigerina bulloides collected from tow samples along a transect from the equatorial Indian ocean to the Southern Ocean (45 degrees E and 80 degrees E and 10 degrees N to 53 degrees S) were analysed and compared with the equilibrium delta O-18 and delta C-13 values of calcite calculated using the temperature and isotopic composition of the water column. The results agree within similar to 0.25% for the region between 10 degrees N and 40 degrees S and 75-200 m water depth which is considered to be the habitat of Globigerina bulloides. Further south (from 40 degrees S to 55 degrees S), however, the measured delta O-18 and delta C-13 values are higher than the expected values by similar to 2% and similar to 1% respectively. These enrichments can be attributed to either a `vital effect' or a higher calcification rate. An interesting pattern of increase in the delta C-13(DIC) value of the surface water with latitude is observed between 35 degrees S and similar to 60 degrees S, with a peak at similar to 42 degrees S. This can be caused by increased organic matter production and associated removal. A simple model accounting for the increase in the delta C-13(DIC) values is proposed which fits well with the observed chlorophyll abundance as a function of latitude. Article in Journal/Newspaper Planktonic foraminifera Southern Ocean Indian Institute of Science, Bangalore: ePrints@IIsc Indian Southern Ocean Scientific Reports 6 1 |
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Open Polar |
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Indian Institute of Science, Bangalore: ePrints@IIsc |
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ftiiscindia |
language |
unknown |
topic |
Centre for Earth Sciences |
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Centre for Earth Sciences Prasanna, K Ghosh, Prosenjit Bhattacharya, SK Mohan, K Anilkumar, N Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean |
topic_facet |
Centre for Earth Sciences |
description |
Oxygen and carbon isotope ratios in planktonic foraminifera Globigerina bulloides collected from tow samples along a transect from the equatorial Indian ocean to the Southern Ocean (45 degrees E and 80 degrees E and 10 degrees N to 53 degrees S) were analysed and compared with the equilibrium delta O-18 and delta C-13 values of calcite calculated using the temperature and isotopic composition of the water column. The results agree within similar to 0.25% for the region between 10 degrees N and 40 degrees S and 75-200 m water depth which is considered to be the habitat of Globigerina bulloides. Further south (from 40 degrees S to 55 degrees S), however, the measured delta O-18 and delta C-13 values are higher than the expected values by similar to 2% and similar to 1% respectively. These enrichments can be attributed to either a `vital effect' or a higher calcification rate. An interesting pattern of increase in the delta C-13(DIC) value of the surface water with latitude is observed between 35 degrees S and similar to 60 degrees S, with a peak at similar to 42 degrees S. This can be caused by increased organic matter production and associated removal. A simple model accounting for the increase in the delta C-13(DIC) values is proposed which fits well with the observed chlorophyll abundance as a function of latitude. |
format |
Article in Journal/Newspaper |
author |
Prasanna, K Ghosh, Prosenjit Bhattacharya, SK Mohan, K Anilkumar, N |
author_facet |
Prasanna, K Ghosh, Prosenjit Bhattacharya, SK Mohan, K Anilkumar, N |
author_sort |
Prasanna, K |
title |
Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean |
title_short |
Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean |
title_full |
Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean |
title_fullStr |
Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean |
title_full_unstemmed |
Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean |
title_sort |
isotopic disequilibrium in globigerina bulloides and carbon isotope response to productivity increase in southern ocean |
publisher |
NATURE PUBLISHING GROUP |
publishDate |
2016 |
url |
http://eprints.iisc.ernet.in/53462/ http://eprints.iisc.ernet.in/53462/1/Sci_Rep_6_21533_2016.pdf https://doi.org/10.1038/srep21533 |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Planktonic foraminifera Southern Ocean |
genre_facet |
Planktonic foraminifera Southern Ocean |
op_relation |
http://eprints.iisc.ernet.in/53462/1/Sci_Rep_6_21533_2016.pdf Prasanna, K and Ghosh, Prosenjit and Bhattacharya, SK and Mohan, K and Anilkumar, N (2016) Isotopic disequilibrium in Globigerina bulloides and carbon isotope response to productivity increase in Southern Ocean. In: SCIENTIFIC REPORTS, 6 . |
op_doi |
https://doi.org/10.1038/srep21533 |
container_title |
Scientific Reports |
container_volume |
6 |
container_issue |
1 |
_version_ |
1766170286881767424 |