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Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management
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Los cambios en la elevación de la capa de hielo de Groenlandia se atribuyen principalmente a la variabilidad de la

McConnell1, Arthern, Mosley-Thompson

  • 1Desert Research Institute, University & Community College System of Nevada, Reno 89512, USA. jmcconn@dri.edu

Nature
|September 6, 2000
PubMed
Resumen

Los cambios en la elevación de la capa de hielo de Groenlandia entre 1978 y 1988 fueron impulsados por la variabilidad de la acumulación de nieve, que no excedió las fluctuaciones climáticas naturales. El monitoreo a largo plazo de la elevación de la capa de hielo y la acumulación de nieve es crucial para comprender los cambios de masa.

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Área de la Ciencia:

  • Glaciología glaciología.
  • Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
  • Ciencias del Sistema Terrestre Ciencias del Sistema Terrestre

Sus antecedentes:

  • La respuesta de las capas de hielo al cambio climático impacta significativamente el aumento futuro del nivel del mar.
  • Los datos satelitales revelan variabilidad espacial en la elevación de la capa de hielo de Groenlandia, pero los procesos geofísicos siguen sin estar claros.
  • Es esencial distinguir los cambios recientes en la capa de hielo de la variabilidad natural.

Objetivo del estudio:

  • Para determinar los cambios de elevación de la capa de hielo en el sur de Groenlandia entre 1978-88.
  • Identificar los procesos geofísicos responsables de los cambios de elevación observados.
  • Evaluar si los cambios recientes se encuentran dentro de la variabilidad climática natural de Groenlandia.

Principales métodos:

  • Utilizó un modelo de densificación de firn basado en la física.
  • Se reconstruyó la acumulación anual de nieve utilizando datos de 12 núcleos de hielo de gran altitud.
  • Comparó los cambios de elevación modelados con mediciones por satélite contemporáneas.

Principales resultados:

  • Los cambios de elevación modelados impulsados por la acumulación coincidieron estrechamente con las observaciones satelitales para 1978-88.
  • Atribuyó los cambios de elevación observados a las variaciones en la acumulación de nieve.
  • Los análisis de núcleos de hielo más largos indicaron una variabilidad típica dentro de los límites naturales para la capa de hielo de Groenlandia.

Conclusiones:

  • La variabilidad de la acumulación de nieve fue el principal impulsor de los cambios de elevación de la capa de hielo de Groenlandia en la década de 1978-88.
  • Los cambios observados estaban dentro de la variabilidad natural a largo plazo de la capa de hielo.
  • Las mediciones integradas a largo plazo de la elevación de la superficie de la capa de hielo y la acumulación de nieve son necesarias para evaluaciones integrales del balance de masas.