EGU2020-89
https://doi.org/10.5194/egusphere-egu2020-89
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Indian Monsoon Rainfall Variability and associated Climatic forcings in the last two millennia inferred by a Stalagmite from the peninsular India

Naveen Gandhi1, Phannindra Reddy A.1, Raghavan Krishnan1, and Madhusudan G. Yadava2
Naveen Gandhi et al.
  • 1Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Road, Pune, India (naveen@tropmet.res.in)
  • 2Physical Research Laboratory, University Area, Ahmedabad, Gujarat 380009, India

We present high temporal (near-annually) resolved δ18O values from absolutely dated stalagmite record that represents the Indian Summer Monsoon (ISM) rainfall variations for the Indian subcontinent spanning from 207 AD to 2014 AD. This rainfall reconstruction shows ISM varaitions for four major global climatic periods viz., Roman Warm Period (RWP), Dark Ages Cold Period (DACP), Medieval Warm Period (MWP) and Little Ice Age (LIA). Cave records from different patrs of the sub-continent synchronously show enhanced precipitation during DACP. This wet period was forced by Solar-induced El-NiNo Southern Oscillation (ENSO) and Tibetan Plateau Temperature. Cliamtic conditions were wetter during LIA than that during MWP, as the former witnessed more number of wet monsoon years. However, MWP witnessed the strongest and the weakest monsoon years in the last two millennia. The direct influence of Soalr activity on the position of Inter Tropical Convergance zone (ITCZ) might have caused the observed ISM variability of MWP. Altough ISM shows largest variability during MWP, the overall monsoon state was moving towards wetter conditions, forced by ENSO. Solar induced forcings on ENSO influenced ISM during LIA. Our results suggest of non-stationary dynamical forcings over ISM during different periods in the last two millennia.

How to cite: Gandhi, N., Reddy A., P., Krishnan, R., and Yadava, M. G.: Indian Monsoon Rainfall Variability and associated Climatic forcings in the last two millennia inferred by a Stalagmite from the peninsular India, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-89, https://doi.org/10.5194/egusphere-egu2020-89, 2019