When Eastern India Oscillated Between Desert Versus Savannah‐Dominated Vegetation - Institut français de Pondichéry Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2022

When Eastern India Oscillated Between Desert Versus Savannah‐Dominated Vegetation

Résumé

During the last glacial period, the tropical hydrological cycle exhibited large variability across orbital and millennial timescales. However, the response of the Indian summer monsoon (ISM), its related impact on terrestrial ecosystems, and associated forcing mechanisms remain controversial. Here we present a marine record of pollen-inferred vegetation changes suggesting that eastern India shifted from woody-savanna mosaics during Marine Isotopic Stage 3 to grasslands during the Last Glacial Maximum resulting from large-scale drying. Our data shows that ISM maximum is in phase with obliquity and precession maxima suggesting a dominant role of the Indian Ocean interhemispheric temperature gradient on glacial ISM variability. Persistent and abrupt dryland expansions of varying magnitude suggest rapid-scale onset of aridity during Heinrich Stadial events and during the Toba eruption. We propose that the amplitude of ISM drought events are initiated by high latitude and volcanic forcings, although modulated by precession.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2022 - Zorzi - When Eastern India Oscillated Between Desert Versus Savannah%u2010Dominated.pdf (1.39 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03753377 , version 1 (18-08-2022)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Coralie Zorzi, Stéphanie Desprat, Charlotte Clément, Kaustubh Thirumalai, Dulce Oliviera, et al.. When Eastern India Oscillated Between Desert Versus Savannah‐Dominated Vegetation. Geophysical Research Letters, 2022, 49 (16), ⟨10.1029/2022GL099417⟩. ⟨hal-03753377⟩
153 Consultations
89 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More