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Sequías africanas y transporte de polvo al Caribe: implicaciones del cambio climático
Joseph M Prospero1, Peter J Lamb
1Cooperative Institute for Marine and Atmospheric Studies, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149-1098, USA. jprospero@rsmas.miami.edu
Science (New York, N.Y.)
|November 8, 2003
Resumen
El transporte de polvo africano al Caribe muestra cambios anuales significativos, inversamente relacionados con las precipitaciones de Sudano-Sahel. Los niveles más bajos de polvo ocurrieron antes de 1970, cuando las precipitaciones fueron más abundantes.
Área de la Ciencia:
- Ciencias de la atmósfera ciencia atmosférica.
- Ciencias del clima ciencia del clima.
- Ciencias ambientales Ciencias ambientales.
Sus antecedentes:
- El polvo africano se transporta a través del Atlántico y el Caribe anualmente.
- Las condiciones de sequía han afectado a la región de Sudano-Sahel desde 1970.
Objetivo del estudio:
- Para analizar la relación entre el transporte de polvo africano y las precipitaciones de Sudano-Sahel.
- Para reconstruir las tendencias históricas de concentración de polvo.
Principales métodos:
- Análisis de las mediciones de polvo de viento comercial en Barbados desde 1965 hasta 1998.
- Análisis de regresión utilizando datos de lluvia a largo plazo.
Principales resultados:
- Las concentraciones de polvo africano en los vientos alisios de Barbados mostraron una significativa variabilidad interanual.
- Los niveles de polvo estaban altamente anticorrelacionados con las precipitaciones en el Sudano-Sahel.
- Es probable que las concentraciones de polvo fueran más bajas antes de 1970, coincidiendo con patrones de lluvia más normales.
Conclusiones:
- El clima influye significativamente en las emisiones de polvo, con el potencial de impactos climáticos a gran escala.
- El cambio climático futuro puede alterar las tasas de emisión de polvo de las regiones áridas, afectando el clima global.
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