Drivers of the <i>δ</i><sup>18</sup>O changes in Indian Summer Monsoon precipitation between the Last Glacial Maximum and pre-industrial period

Tharammal, Thejna; Bala, Govindasamy; Nusbaumer, Jesse

doi:10.5194/cp-22-427-2026

Articles | Volume 22, issue 2

https://doi.org/10.5194/cp-22-427-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/cp-22-427-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 2

Research article

|

02 Mar 2026

Research article |

| 02 Mar 2026

Drivers of the δ¹⁸O changes in Indian Summer Monsoon precipitation between the Last Glacial Maximum and pre-industrial period

Thejna Tharammal, Govindasamy Bala, and Jesse Nusbaumer

Supplement

https://doi.org/10.5194/cp-22-427-2026-supplement

Data sets

Dataset for the publication: Drivers of the δ18O changes in Indian Summer Monsoon precipitation between the Last Glacial Maximum and pre-industrial period Thejna Tharammal https://doi.org/10.5281/zenodo.18791301

Short summary

During the Last Glacial Maximum (LGM), the Indian monsoon rainfall was 15 % lower than the pre-industrial period due to global cooling and changes in atmospheric circulation. The isotopic composition of rainfall, more positive during the LGM, is not directly linked to the rain amount. It is influenced by a reduced contribution of moisture from distant sources and less rainouts during transport from the Indian Ocean. Hence, Isotopic proxies may be better indicators of atmospheric circulation.