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Intrusion of Arabian Sea high salinity water and monsoon-associated processes modulate planktic foraminiferal abundance and carbon burial in the southwestern Bay of Bengal

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Abstract

The unicellular calcareous planktic foraminifera sequester a significant portion of the carbon dioxide dissolved in the ocean, thus burying the carbon in sediments for millions of years. The global warming and associated processes are likely to affect the planktic foraminiferal abundance and diversity. Therefore, their baseline distribution has to be documented and correlated with ambient parameters to assess its fate under different climate change scenarios. Here, we report an exceptionally high abundance of planktic foraminifera and thus large carbon burial in the southwestern Bay of Bengal. The very high absolute abundance of planktic foraminifera in the Cauvery River basin is attributed to biannual productivity, warmer and saline waters. Globigerinita glutinata is the highest abundant species followed by Globigerinoides ruber and Globigerina bulloides. Globigerina bulloides is abundant on the shelf, where the upwelling is more frequent. The relative abundance of Globorotalia menardii is positively correlated with thermocline salinity and negatively correlated with thermocline temperature. Similarly, Neogloboquadrina dutertrei and Globoquadrina conglomerata are negatively correlated with mixed layer as well as thermocline temperature and mixed layer salinity. Both these species are positively correlated with thermocline salinity. Globigerina falconensis is more abundant in the southernmost transect influenced by intense winter monsoon precipitation. We report that G. ruber prefers high saline and warmer waters with the highest abundance in the southernmost transect. From the foraminiferal distribution, it is evident that the temperature and salinity of the mixed layer as well as thermocline, food availability, and monsoon-associated processes affect the planktic foraminiferal abundance and thus carbon burial in the southwestern Bay of Bengal. The changes in influx of southeastern Arabian Sea water will affect the planktic foraminiferal population and subsequent carbon burial in the southwestern Bay of Bengal.

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Acknowledgements

We are thankful to all the crew members and scientists who participated in 67th cruise of RV Sindhu Sadhana (SSD076) to collect the samples. We also acknowledge the help by Shri Shashikant Velip, Senior Technical Officer, National Institute of Oceanography, Goa, to operate the multicorer. The authors thank Dr. Sujata R. Kurtarkar for the help in identification of planktic foraminifera. The help by Mrs. Teja Ankush Naik in CN and TIC analysis under the Central Analytical Facility (CAF) of the CSIR-National Institute of Oceanography, Goa, India, is thankfully acknowledged. MS thanks Joint CSIR-University Grants Commission for providing the research fellowship. The authors thank the two anonymous reviewers for the suggestions to improve a previous version of the manuscript.

Funding

The work was funded by the Science and Engineering Research Board, Department of Science and Technology, Government of India, under Core Research Grant Scheme to RS (Grant Number CRG/2019/000221).

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RS conceptualized and designed the project. Material preparation, data collection, and analysis were performed by MS and RS. The first draft of the manuscript was written by MS, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Mohd Salman.

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Salman, M., Saraswat, R. Intrusion of Arabian Sea high salinity water and monsoon-associated processes modulate planktic foraminiferal abundance and carbon burial in the southwestern Bay of Bengal. Environ Sci Pollut Res 31, 24961–24985 (2024). https://doi.org/10.1007/s11356-024-32685-4

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