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Decoupling of monsoon activity across the northern and southern Indo-Pacific during the Late Glacial
- Source :
- Quaternary Science Reviews. 176:101-105
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Recent studies of stalagmites from the Southern Hemisphere tropics of Indonesia reveal two shifts in monsoon activity not apparent in records from the Northern Hemisphere sectors of the Austral-Asian monsoon system: an interval of enhanced rainfall at ∼19 ka, immediately prior to Heinrich Stadial 1, and a sharp increase in precipitation at ∼9 ka. Determining whether these events are site-specific or regional is important for understanding the full range of sensitivities of the Austral-Asian monsoon. We present a discontinuous 40 kyr carbon isotope record of stalagmites from two caves in the Kimberley region of the north-central Australian tropics. Heinrich stadials are represented by pronounced negative carbon isotopic anomalies, indicative of enhanced rainfall associated with a southward shift of the intertropical convergence zone and consistent with hydroclimatic changes observed across Asia and the Indo-Pacific. Between 20 and 8 ka, however, the Kimberley stalagmites, like the Indonesian record, reveal decoupling of monsoon behavior from Southeast Asia, including the early deglacial wet period (which we term the Late Glacial Pluvial) and the abrupt strengthening of early Holocene monsoon rainfall.
- Subjects :
- Archeology
Global and Planetary Change
010504 meteorology & atmospheric sciences
Intertropical Convergence Zone
Northern Hemisphere
Geology
010502 geochemistry & geophysics
Monsoon
01 natural sciences
Oceanography
Pluvial
Climatology
Glacial period
Stadial
Precipitation
Ecology, Evolution, Behavior and Systematics
Holocene
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 02773791
- Volume :
- 176
- Database :
- OpenAIRE
- Journal :
- Quaternary Science Reviews
- Accession number :
- edsair.doi...........5da6e007c8fb0bcea47deda9e2ff9003