Seasonal drought events in tropical East Asia over the last 60,000 y.
Proc Natl Acad Sci U S A
; 117(49): 30988-30992, 2020 12 08.
Article
in En
| MEDLINE
| ID: mdl-33229562
ABSTRACT
The cause of seasonal hydrologic changes in tropical East Asia during interstadial/stadial oscillations of the last glaciation remains controversial. Here, we show seven seasonal drought events that occurred during the relatively warm interstadials by phytolith and pollen records. These events are significantly manifested as high percentages of bilobate phytoliths and are consistent with the large zonal sea-surface temperature (SST) gradient from the western to eastern tropical Pacific, suggesting that the reduction in seasonal precipitation could be interpreted by westward shifts of the western Pacific subtropical high triggered by changes of zonal SST gradient over the tropical Pacific and Hadley circulation in the Northern Hemisphere. Our findings highlight that both zonal and meridional ocean-atmosphere circulations, rather than solely the Intertropical Convergence Zone or El Niño-Southern Oscillation, controlled the hydrologic changes in tropical East Asia during the last glaciation.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Seasons
/
Tropical Climate
/
Droughts
Country/Region as subject:
Asia
Language:
En
Journal:
Proc Natl Acad Sci U S A
Year:
2020
Document type:
Article
Publication country:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
/
US
/
USA