10.6084/m9.figshare.3454853.v1
Soma De
Soma
De
Sudipta Sarkar
Sudipta
Sarkar
Anil K. Gupta
Anil K.
Gupta
Orbital and suborbital variability in the equatorial Indian Ocean as recorded in sediments of the Maldives Ridge (ODP Hole
716A) during the past 444 ka
Geological Society of London
2016
Ocean Drilling Program Hole 716
444 ka record
MIS
wind intensity
variability
thermocline species Neogloboquadrina dutertrei
climate
10 cm 3 volume
pteropod
Maldives Ridge
benthic foraminifera Cymbaloporetta squammosa
Cymbaloporetta squammosa population
region
detrended time series
Globigerinoide
ODP Hole 716
444 ka
Indian monsoon
Indian Ocean wind intensity
Indian Ocean
1 cm intervals
Geology
2016-06-21 12:23:59
Dataset
https://geolsoc.figshare.com/articles/dataset/Orbital_and_suborbital_variability_in_the_equatorial_Indian_Ocean_as_recorded_in_sediments_of_the_Maldives_Ridge_ODP_Hole___716A_during_the_past_444_ka/3454853
<p>This study is aimed at understanding past 444 ka record of climate variability in the equatorial Indian Ocean using high resolution
records of planktic and benthic foraminifera and pteropods from Ocean Drilling Program Hole 716A, Maldives Ridge, southeastern
Arabian Sea. In total, 892 samples of 10 cm<sup>3</sup> volume from 444 ka old sequence were analysed at 1 cm intervals to generate census data of the foraminiferal fauna and pteropods.
The percent and detrended time series of mixed-layer species <em>Globigerinoides ruber</em> and <em>Globigerinoides sacculifer</em> and thermocline species <em>Neogloboquadrina dutertrei</em>, benthic foraminifera <em>Cymbaloporetta squammosa</em>, <em>Sphaeroidina bulloides</em> and <em>Uvigerina proboscidea</em>, and pteropods from ODP Hole 716A reveal significant changes in wind intensity during the past 444 ka. An abrupt decrease
in the <em>Cymbaloporetta squammosa</em> population at <em>c.</em> 300 ka (across MIS 8/9) suggests a weakening of equatorial wind intensity, which could be linked to Indian monsoon and may
have driven pronounced changes in the oxygen minimum zone in the Maldivian region. These changes were contemporaneous with
the Mid-Brunhes Climatic Event, the beginning of aridity in the Indonesian-Australian region and the onset of a humid phase
in equatorial East Africa as observed in several oceanic and continental records. This strengthens a connection between equatorial
Indian Ocean wind intensity, the Indian monsoon and Indonesian-Australian-African climates.
</p>