Abrupt weakening of the summer monsoon in northwest India ~4100 yr ago

Dixit, Yama and Hodell, David A. and Petrie, Cameron A. (2014) Abrupt weakening of the summer monsoon in northwest India ~4100 yr ago. Geology, 42 (4). pp. 339-342. ISSN 0091-7613, 1943-2682 DOI 10.1130/G35236.1

[img]
Preview
Image
Dixit et al. - 2014 - Abrupt weakening of the summer monsoon in northwes.pdf - Published Version
Available under License Creative Commons Attribution.

Download (685kB) | Preview
[img]
Preview
Image
F1.medium.gif

Download (172kB) | Preview
Official URL: http://geology.geoscienceworld.org/content/42/4/33...

Abstract

Climate change has been suggested as a possible cause for the decline of urban centers of the Indus Civilization ∼4000 yr ago, but extant paleoclimatic evidence has been derived from locations well outside the distribution of Indus settlements. Here we report an oxygen isotope record of gastropod aragonite (δ18Oa) from Holocene sediments of paleolake Kotla Dahar (Haryana, India), which is adjacent to Indus settlements and documents Indian summer monsoon (ISM) variability for the past 6.5 k.y. A 4‰ increase in δ18Oa occurred at ca. 4.1 ka marking a peak in the evaporation/precipitation ratio in the lake catchment related to weakening of the ISM. Although dating uncertainty exists in both climate and archaeological records, the drought event 4.1 ka on the northwestern Indian plains is within the radiocarbon age range for the beginning of Indus de-urbanization, suggesting that climate may have played a role in the Indus cultural transformation.

Item Type: Article
Uncontrolled Keywords: 2014AREP; IA67;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Geology
Volume: 42
Page Range: pp. 339-342
Identification Number: 10.1130/G35236.1
Depositing User: Sarah Humbert
Date Deposited: 29 May 2014 16:39
Last Modified: 09 Jun 2014 08:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/3061

Actions (login required)

View Item View Item

About cookies