Age determinations on ODP Hole 117-723A in the Arabian Sea, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1996): A high-resolution record of late Quaternary upwelling along the Oman Margin, Arabian Sea based on planktonic foraminifera. Paleoceanography, 11(1), 129-140
Planktonic foraminiferal abundances, fluxes, test sizes, and coiling properties are influenced in various ways by the southwest monsoon winds and associated upwelling in the western Arabian Sea. To determine the short-term changes in the southwest monsoon, we have carried out a high-resolution time-...
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1996
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ftdatacite:10.1594/pangaea.52692 2023-05-15T18:01:15+02:00 Age determinations on ODP Hole 117-723A in the Arabian Sea, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1996): A high-resolution record of late Quaternary upwelling along the Oman Margin, Arabian Sea based on planktonic foraminifera. Paleoceanography, 11(1), 129-140 Naidu, Pothuri Divakar Malmgren, Bjorn 1996 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.52692 https://doi.pangaea.de/10.1594/PANGAEA.52692 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1029/95pa03198 https://dx.doi.org/10.1029/95gl02558 https://dx.doi.org/10.1029/94pa02682 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY DEPTH, sediment/rock Sample code/label Age, dated Age, dated standard deviation Drilling/drill rig DSDP/ODP/IODP sample designation Age, 14C AMS Age, 14C calibrated, CALIB Stuiver & Reimer, 1993 Leg117 Joides Resolution Ocean Drilling Program ODP Supplementary Dataset dataset Dataset 1996 ftdatacite https://doi.org/10.1594/pangaea.52692 https://doi.org/10.1029/95pa03198 https://doi.org/10.1029/95gl02558 https://doi.org/10.1029/94pa02682 2022-02-08T16:02:21Z Planktonic foraminiferal abundances, fluxes, test sizes, and coiling properties are influenced in various ways by the southwest monsoon winds and associated upwelling in the western Arabian Sea. To determine the short-term changes in the southwest monsoon, we have carried out a high-resolution time-series analysis of three upwelling indices (total flux of planktonic foraminiferal tests and flux and relative abundance of the planktonic foraminiferal species Globigerina bulloides) from Ocean Drilling Program (ODP) Site 723A (Oman Margin, western Arabian Sea) spanning the last 19 kyr. In addition, we have determined the relationships between upwelling intensity and the relative abundance, fluxes, and shell concentrations of various planktonic foraminiferal species. Upwelling indices suggest that from 19 to 16 ka (22 to 18.2 cal kyr B.P.) the SW monsoon was relatively strong compared to the period 15.8 to 12.5 ka (17.8 to 13.8 cal kyr B.P.). The intensification of the SW monsoon took place at 12 ka (13.1 cal kyr B.P.) and reached a peak between 10 and 5 ka (10.6 and 4.8 cal kyr B.P.). The high-resolution data further demonstrate that the SW monsoon has started weakening from 5 ka (4.8 cal kyr B.P.) and the weakest phase was in place at 3.5 ka (3 cal kyr B.P.), which coincides with evidence of an arid climate in western Tibet. Fluxes and shell concentrations of many of the planktonic foraminiferal species increased between 12 and 5 ka in response to the intensification of the SW monsoon winds after the last glacial period. Globigerina bulloides shows a fivefold to tenfold increase in flux during this period of intense upwelling. The other species whose fluxes are influenced by this upwelling change are (in order from strongest to weakest response) Globigerinita glutinata, Globigerinoides ruber, Neogloboquadrina dutertrei, Globigerinella aequilateralis, Globigerina falconensis, and Globigerinoides sacculifer. The relative abundances of G. bulloides and G. ruber increased during intense upwelling, whereas the relative abundances of G. glutinata, N. dutertrei, G. falconensis, and G. sacculifer did not increase during this period, which might be due to differences in the productivity of various species in relation to upwelling change. Therefore the fluxes and shell concentrations provide better and more reliable information about the changes in the monsoon system in the Arabian Sea than relative abundance data. Dataset Planktonic foraminifera DataCite Metadata Store (German National Library of Science and Technology) Malmgren ENVELOPE(-66.117,-66.117,-65.750,-65.750) Reimer ENVELOPE(-86.200,-86.200,-77.800,-77.800) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
DEPTH, sediment/rock Sample code/label Age, dated Age, dated standard deviation Drilling/drill rig DSDP/ODP/IODP sample designation Age, 14C AMS Age, 14C calibrated, CALIB Stuiver & Reimer, 1993 Leg117 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
DEPTH, sediment/rock Sample code/label Age, dated Age, dated standard deviation Drilling/drill rig DSDP/ODP/IODP sample designation Age, 14C AMS Age, 14C calibrated, CALIB Stuiver & Reimer, 1993 Leg117 Joides Resolution Ocean Drilling Program ODP Naidu, Pothuri Divakar Malmgren, Bjorn Age determinations on ODP Hole 117-723A in the Arabian Sea, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1996): A high-resolution record of late Quaternary upwelling along the Oman Margin, Arabian Sea based on planktonic foraminifera. Paleoceanography, 11(1), 129-140 |
topic_facet |
DEPTH, sediment/rock Sample code/label Age, dated Age, dated standard deviation Drilling/drill rig DSDP/ODP/IODP sample designation Age, 14C AMS Age, 14C calibrated, CALIB Stuiver & Reimer, 1993 Leg117 Joides Resolution Ocean Drilling Program ODP |
description |
Planktonic foraminiferal abundances, fluxes, test sizes, and coiling properties are influenced in various ways by the southwest monsoon winds and associated upwelling in the western Arabian Sea. To determine the short-term changes in the southwest monsoon, we have carried out a high-resolution time-series analysis of three upwelling indices (total flux of planktonic foraminiferal tests and flux and relative abundance of the planktonic foraminiferal species Globigerina bulloides) from Ocean Drilling Program (ODP) Site 723A (Oman Margin, western Arabian Sea) spanning the last 19 kyr. In addition, we have determined the relationships between upwelling intensity and the relative abundance, fluxes, and shell concentrations of various planktonic foraminiferal species. Upwelling indices suggest that from 19 to 16 ka (22 to 18.2 cal kyr B.P.) the SW monsoon was relatively strong compared to the period 15.8 to 12.5 ka (17.8 to 13.8 cal kyr B.P.). The intensification of the SW monsoon took place at 12 ka (13.1 cal kyr B.P.) and reached a peak between 10 and 5 ka (10.6 and 4.8 cal kyr B.P.). The high-resolution data further demonstrate that the SW monsoon has started weakening from 5 ka (4.8 cal kyr B.P.) and the weakest phase was in place at 3.5 ka (3 cal kyr B.P.), which coincides with evidence of an arid climate in western Tibet. Fluxes and shell concentrations of many of the planktonic foraminiferal species increased between 12 and 5 ka in response to the intensification of the SW monsoon winds after the last glacial period. Globigerina bulloides shows a fivefold to tenfold increase in flux during this period of intense upwelling. The other species whose fluxes are influenced by this upwelling change are (in order from strongest to weakest response) Globigerinita glutinata, Globigerinoides ruber, Neogloboquadrina dutertrei, Globigerinella aequilateralis, Globigerina falconensis, and Globigerinoides sacculifer. The relative abundances of G. bulloides and G. ruber increased during intense upwelling, whereas the relative abundances of G. glutinata, N. dutertrei, G. falconensis, and G. sacculifer did not increase during this period, which might be due to differences in the productivity of various species in relation to upwelling change. Therefore the fluxes and shell concentrations provide better and more reliable information about the changes in the monsoon system in the Arabian Sea than relative abundance data. |
format |
Dataset |
author |
Naidu, Pothuri Divakar Malmgren, Bjorn |
author_facet |
Naidu, Pothuri Divakar Malmgren, Bjorn |
author_sort |
Naidu, Pothuri Divakar |
title |
Age determinations on ODP Hole 117-723A in the Arabian Sea, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1996): A high-resolution record of late Quaternary upwelling along the Oman Margin, Arabian Sea based on planktonic foraminifera. Paleoceanography, 11(1), 129-140 |
title_short |
Age determinations on ODP Hole 117-723A in the Arabian Sea, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1996): A high-resolution record of late Quaternary upwelling along the Oman Margin, Arabian Sea based on planktonic foraminifera. Paleoceanography, 11(1), 129-140 |
title_full |
Age determinations on ODP Hole 117-723A in the Arabian Sea, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1996): A high-resolution record of late Quaternary upwelling along the Oman Margin, Arabian Sea based on planktonic foraminifera. Paleoceanography, 11(1), 129-140 |
title_fullStr |
Age determinations on ODP Hole 117-723A in the Arabian Sea, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1996): A high-resolution record of late Quaternary upwelling along the Oman Margin, Arabian Sea based on planktonic foraminifera. Paleoceanography, 11(1), 129-140 |
title_full_unstemmed |
Age determinations on ODP Hole 117-723A in the Arabian Sea, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1996): A high-resolution record of late Quaternary upwelling along the Oman Margin, Arabian Sea based on planktonic foraminifera. Paleoceanography, 11(1), 129-140 |
title_sort |
age determinations on odp hole 117-723a in the arabian sea, supplement to: naidu, pothuri divakar; malmgren, bjorn (1996): a high-resolution record of late quaternary upwelling along the oman margin, arabian sea based on planktonic foraminifera. paleoceanography, 11(1), 129-140 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1996 |
url |
https://dx.doi.org/10.1594/pangaea.52692 https://doi.pangaea.de/10.1594/PANGAEA.52692 |
long_lat |
ENVELOPE(-66.117,-66.117,-65.750,-65.750) ENVELOPE(-86.200,-86.200,-77.800,-77.800) |
geographic |
Malmgren Reimer |
geographic_facet |
Malmgren Reimer |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://dx.doi.org/10.1029/95pa03198 https://dx.doi.org/10.1029/95gl02558 https://dx.doi.org/10.1029/94pa02682 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.52692 https://doi.org/10.1029/95pa03198 https://doi.org/10.1029/95gl02558 https://doi.org/10.1029/94pa02682 |
_version_ |
1766170634756292608 |