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Polvo de altas latitudes sobre el Atlántico Norte: aportaciones de las tormentas de polvo proglaciales islandesas
Joseph M Prospero1, Joanna E Bullard, Richard Hodgkins
1Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL 33149, USA.
Science (New York, N.Y.)
|March 3, 2012
Resumen
El polvo mineral de regiones de altas latitudes como Islandia es un componente atmosférico significativo. Esta investigación destaca las llanuras de lavado de glaciares como fuentes clave, que impactan el sistema climático del Atlántico Norte.
Área de la Ciencia:
- Ciencias de la atmósfera Ciencias atmosféricas.
- Ciencias del clima Ciencias del clima Ciencias del clima
- Geología Geología Geología.
Sus antecedentes:
- Los aerosoles minerales influyen significativamente en el sistema climático atmósfera-océano.
- Las investigaciones anteriores se han centrado principalmente en las regiones áridas de latitudes bajas como las principales fuentes de polvo mineral.
- El papel de las fuentes de latitudes altas sigue siendo poco explorado.
Objetivo del estudio:
- Investigar fuentes sustanciales de polvo mineral en regiones frías y de latitudes más altas.
- Para analizar la frecuencia del evento de polvo, la concentración y las vías de transporte desde Islandia.
- Evaluar el impacto del cambio climático en las emisiones de polvo en latitudes altas.
Principales métodos:
- Un registro de medición de 6 años de Heimaey, una isla al sur de Islandia.
- Análisis de la frecuencia y las concentraciones de eventos de polvo.
- Correlación de las emisiones de polvo con la actividad glacial y las condiciones meteorológicas.
Principales resultados:
- Se observaron frecuentes eventos de polvo en Heimaey, con concentraciones superiores a 20 μg/m3.
- Transporte significativo hacia el sur de polvo potencialmente rico en hierro hacia el Atlántico Norte.
- Las emisiones de polvo alcanzan su pico en la primavera, vinculadas a las llanuras de lavado de glaciares activos y las inundaciones de estallidos glaciales.
Conclusiones:
- Las regiones frías de altas latitudes, particularmente las áreas glaciares de Islandia, son fuentes sustanciales de polvo mineral atmosférico.
- Se espera que el aumento del retroceso del hielo debido al calentamiento global aumente las emisiones de polvo de estas regiones.
- Esta deposición de polvo tiene un impacto en el sistema climático del Atlántico Norte, lo que requiere más investigación.
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