Session: Warm Climates (Mid-Holocene, Last interglacial, Deep-time, Pliocene)
Author: Krishnan Raghavan / email@example.com / Indian Institute of Tropical Meteorology
Co-author: T.P. Sabin, P. Priya, S.Chakraborty, H.Borgaonkar, N.Gandhi, T.Guha, Indian Institute of Tropical Meteorology, Pune, India;
Pascale Bracconot, Institut Pierre-Simon Laplace (IPSL), France;
Knowledge about past climatic variations is critical for making reliable assessments of future changes in global and regional monsoon hydrological cycle. Paucity of long-term climate observations, limited spatio-temporal coverage of climate proxy records and complexities in modelling multi-scale variations of monsoon precipitation, pose inherent challenges in comprehending the behaviour of monsoon precipitation extremes in the past. Historical climate records for the 19th and 20th centuries provide valuable information on teleconnection linkages of the Asian monsoon precipitation with tropical and extra-tropical modes of climate variability. This study presents analyses of paleo-climate simulations for the mid-Holocene (~ 6000 years BP) and Pre-Industrial conditions (late 19th century) using a global climate model having high-resolution (< 35 km) telescopic zooming over South Asia, combined with analysis of climate historical records and reconstructions from climate proxies. Our analyses indicate the role of mid-Holocene paleoclimatic constraints on the mean background conditions over the tropics and extra-tropics and the dominant modes of climate variability (eg. ENSO, NAO…), which in turn appear to have influenced monsoon precipitation extremes over South Asia.