Abstract Details
(2020) Late Quaternary Variations in Monsoon Induced Upwelling and Oxygen Minimum Zone in the Eastern Arabian Sea: A Study Based on the Thecosome Pteropod Assemblage and Total Organic Carbon of Sediment
Majumder J, Gupta AK, Kumar P, Mohan K & Biju N
https://doi.org/10.46427/gold2020.1707
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10l: Room 3, Saturday 27th June 01:15 - 01:18
Jeet Majumder
Anil Kumar Gupta View abstracts at 3 conferences in series
Pankaj Kumar View abstracts at 3 conferences in series
Kuppusamy Mohan
Nirmal Biju
Anil Kumar Gupta View abstracts at 3 conferences in series
Pankaj Kumar View abstracts at 3 conferences in series
Kuppusamy Mohan
Nirmal Biju
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Submitted by Yongli Wang on Thursday 25th June 10:08
This is a very interesting research covering the whole Holocene period. There are many abrupt climatic events happened during this interval, such as the 8.2ka and 4.2ka event, and the Holocene Climatic Optimum. Are the Pteropod assemblages varied obviously corresponding to these events?
The eastern Arabian Sea bears less signature of monsoon induces events, compared to the western Arabian Sea. The short term events like 4.2 ka and 8.2 ka were not prominent throughout the world. Moreover, their signatures are not equal in the eastern and western parts of the Arabian Sea. However, pteropod assemblage shows the signature of these events to a certain extent. 4.2 ka event: Limacina trochiformis (an upwelling indicator species of pteropod) shows a sudden drop in abundance from 4.5 to 4 ka, which can be correlated to the 4.2 ka event. 8.2 ka event: Limacina trochiformis shows a relative drop in abundance from 9 to 8.5 ka. Whether this is related to the 8.2 ka event, I am not sure. I am willing to do oxygen isotope analysis of pteropod shells, to get the answers. Holocene climate optimum (HCO): Variation in abundance of Limacina trochiformis along with TOC % suggests the signature of HCO condition. To infer precisely, later, I will do oxygen isotope analysis of pteropod and foraminifera shells, and compare with the pteropod abundance data.
This is a very interesting research covering the whole Holocene period. There are many abrupt climatic events happened during this interval, such as the 8.2ka and 4.2ka event, and the Holocene Climatic Optimum. Are the Pteropod assemblages varied obviously corresponding to these events?
The eastern Arabian Sea bears less signature of monsoon induces events, compared to the western Arabian Sea. The short term events like 4.2 ka and 8.2 ka were not prominent throughout the world. Moreover, their signatures are not equal in the eastern and western parts of the Arabian Sea. However, pteropod assemblage shows the signature of these events to a certain extent. 4.2 ka event: Limacina trochiformis (an upwelling indicator species of pteropod) shows a sudden drop in abundance from 4.5 to 4 ka, which can be correlated to the 4.2 ka event. 8.2 ka event: Limacina trochiformis shows a relative drop in abundance from 9 to 8.5 ka. Whether this is related to the 8.2 ka event, I am not sure. I am willing to do oxygen isotope analysis of pteropod shells, to get the answers. Holocene climate optimum (HCO): Variation in abundance of Limacina trochiformis along with TOC % suggests the signature of HCO condition. To infer precisely, later, I will do oxygen isotope analysis of pteropod and foraminifera shells, and compare with the pteropod abundance data.
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