North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka ...

• Main Authors: Premaratne, Kusala Madhushani, Chandrajith, Rohana, Ratnayake, Nalin P, Li, Si-Liang, Gayantha, Kasun, Routh, Joyanto
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: SAGE Journals 2023
• Subjects: Geography; History; Indian; North Atlantic; Ocean Island
• Online Access: https://dx.doi.org/10.25384/sage.c.6982594; https://sage.figshare.com/collections/North_Atlantic_forcing_of_Indian_Winter_Monsoon_intensification_Evidence_from_Holocene_sediments_from_the_tropical_Indian_Ocean_Island_of_Sri_Lanka/6982594

The teleconnection between the Asian monsoon system and North Atlantic forcing is an enduring prospect of the Earth’s climate. During the Holocene interstadial, the Indian summer monsoon showed asynchronous weakening links to ice rafting events documented in the North Atlantic region. However, the sensitivity of the Indian Winter Monsoon in response to North Atlantic cold spells is unclear due to a lack of compelling evidence. This study aims to extract the deglacial Indian Winter Monsoon signals using lithogenic tracers in coastal sediments and explore its association with the North Atlantic cooling episodes. A 5.1 m sediment core was retrieved from Pottuvil Lagoon in the southeastern coast of Sri Lanka, and the concentrations of K, Rb, Mg, Al, and Ti in 101 sub-sections were analysed using ICP-MS. The core- chronology was established by Bacon 2.2 age-depth modelling based on calibrated AMS 14 C dates. The monsoon signal was reconstructed using element proxies and compared with the drift ice indices from ...