Document Detail


Tracing the effects of the Little Ice Age in the tropical lowlands of eastern Mesoamerica.
MedLine Citation:
PMID:  17913875     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The causes of late-Holocene centennial to millennial scale climatic variability and the impact that such variability had on tropical ecosystems are still poorly understood. Here, we present a high-resolution, multiproxy record from lowland eastern Mesoamerica, studied to reconstruct climate and vegetation history during the last 2,000 years, in particular to evaluate the response of tropical vegetation to the cooling event of the Little Ice Age (LIA). Our data provide evidence that the densest tropical forest cover and the deepest lake of the last two millennia were coeval with the LIA, with two deep lake phases that follow the Spörer and Maunder minima in solar activity. The high tropical pollen accumulation rates limit LIA's winter cooling to a maximum of 2 degrees C. Tropical vegetation expansion during the LIA is best explained by a reduction in the extent of the dry season as a consequence of increased meridional flow leading to higher winter precipitation. These results highlight the importance of seasonal responses to climatic variability, a factor that could be of relevance when evaluating the impact of recent climate change.
Authors:
Ma del Socorro Lozano-García; Margarita Caballero; Beatriz Ortega; Alejandro Rodríguez; Susana Sosa
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Publication Detail:
Type:  Historical Article; Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-10-03
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  104     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-10-16     Completed Date:  2007-11-28     Revised Date:  2013-06-06    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  16200-3     Citation Subset:  IM    
Affiliation:
Instituto de Geología, Instituto de Geofísica, and Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, México DF, 04510, México. mslozano@servidor.unam.mx
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MeSH Terms
Descriptor/Qualifier:
Caribbean Region
Cold Climate
Diatoms
Ecosystem*
Fossils
History, Ancient
Ice Cover*
Mexico
Pollen
Time Factors
Tropical Climate*
Comments/Corrections

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