Speleothem evidence of solar modulation on the south Asia monsoon intensity
Journal
npj Climate and Atmospheric Science
Journal Volume
8
Journal Issue
1
ISSN
2397-3722
Date Issued
2025-03-15
Author(s)
Abstract
The influence of solar variation on climate has long been debated. Here, we utilize a decadal-resolved speleothem δ18O record from Vietnam, spanning 32.5 to 27.5 kyr BP, as a proxy for regional precipitation levels. Our results show a general coherence between Total Solar Irradiance (TSI) and regional precipitation, supporting a positive climate response consistent with conventional monsoon theory. Spectral analysis on studied datasets reveals an approximately 180-year periodicity coinciding with the de Vries cycle of solar activity. Further comparing our record with 35 other speleothem records, we demonstrate the importance of sufficient age control points in capturing solar-related periodicities. Model simulation shows that TSI could enhance monsoonal circulation and regional precipitation. Also highlighted are the implications of chronology control for detecting climate events in proxy records. The new findings underscore the significance of relatively minor radiative forcing in regional climate dynamics over monsoonal Asia on decadal to centennial timescales.
Subjects
Viet Nam
climate effect
climate variation
computer simulation
data set
irradiance
monsoon
numerical model
oxygen isotope
periodicity
precipitation (climatology)
proxy climate record
radiative forcing
regional climate
solar radiation
spectral analysis
speleothem
timescale
SDGs
Publisher
Springer Science and Business Media LLC
Type
journal article