Tracking Indian monsoon variability from changes in sediment provenance

Type Article
Date 2020-07
Language English
Other localization
Author(s) Awasthi Neeraj1, Ray Jyotiranjan S2
Affiliation(s) 1 : Department of Earth and Planetary Sciences, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study and Research, VBS Purvanchal University, Jaunpur 222 003, India
2 : Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India
Source Current Science (0011-3891) (Indian Academy of Sciences), 2020-07 , Vol. 119 , N. 2 , P. 291-306
DOI 10.18520/cs/v119/i2/291-306
Keyword(s) Climate, Himalaya, Indian monsoon, sediment cores, Sr-Nd isotopes, weathering-erosion

Terrestrial and marine sediments preserved on the Indian sub-continent and in seas/oceans around it are excellent archives for studying and reconstructing past variations in monsoonal climate. Based on the multiproxy studies on the sediment cores, a coherent relationship between the intensities of the monsoon and glacial–interglacial conditions and a strong atmospheric teleconnection between the Asian and North Atlantic climates has been suggested. Terrestrial sediment cores clearly established that the variations in the monsoonal climate and/or change in glacial extant played an important role in varying weathering/erosion in source regions and relative supply of sediments. Marine sediment studies presented a more complicated picture because their depositions were influenced by changes in sea-levels, movement of shorelines, river mouths, deltas and sea surface-circulations. A composite climate record suggested that the intensity of Indian SW monsoon has weakened and NE monsoon strengthened during glacial periods and vice-versa during the interglacial periods.

Full Text
File Pages Size Access
Publisher's official version 16 1 MB Open access
Top of the page