Solar modulation of Little Ice Age climate in the tropical Andes.
Proc Natl Acad Sci U S A
; 103(24): 8937-42, 2006 Jun 13.
Article
em En
| MEDLINE
| ID: mdl-16740660
The underlying causes of late-Holocene climate variability in the tropics are incompletely understood. Here we report a 1,500-year reconstruction of climate history and glaciation in the Venezuelan Andes using lake sediments. Four glacial advances occurred between anno Domini (A.D.) 1250 and 1810, coincident with solar-activity minima. Temperature declines of -3.2 +/- 1.4 degrees C and precipitation increases of approximately 20% are required to produce the observed glacial responses. These results highlight the sensitivity of high-altitude tropical regions to relatively small changes in radiative forcing, implying even greater probable responses to future anthropogenic forcing.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Luz Solar
/
Temperatura
/
Clima Tropical
/
Clima
Tipo de estudo:
Prognostic_studies
País/Região como assunto:
America do sul
/
Venezuela
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Estados Unidos
País de publicação:
Estados Unidos