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El reciente retroceso de los glaciares tropicales andinos no tiene precedentes en el Holoceno

Andrew L Gorin^1,2, Jeremy D Shakun¹, Andrew G Jones³

¹Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA, USA.

Science (New York, N.Y.)

|August 1, 2024

Resumen

Los glaciares tropicales son ahora más pequeños que en cualquier momento en los últimos 11.700 años. Este estudio utilizó núcleos cosmogénicos para reconstruir las extensiones de los glaciares, revelando un retroceso sin precedentes en los trópicos.

Área de la Ciencia:

Glaciología
Paleoclimatología
Ciencias Cuaternarias

Sus antecedentes:

Los glaciares tropicales son indicadores sensibles del cambio climático.
Las últimas décadas han visto un retroceso significativo de los glaciares a nivel mundial, pero el contexto a largo plazo para los glaciares tropicales sigue siendo incierto.

Objetivo del estudio:

Para determinar si el reciente retroceso de los glaciares tropicales excede la variabilidad natural del Holoceno.
Para reconstruir las extensiones pasadas de los glaciares tropicales utilizando la datación cosmogénica.

Principales métodos:

Medición de las concentraciones cosmogénicas de berilio-10 y carbono-14.
Análisis de roca recientemente expuesta en los márgenes de cuatro glaciares tropicales andinos.

Principales resultados:

Las concentraciones de nucleidos cosmogénicos estuvieron cerca de cero en la mayoría de las muestras.
Esto indica que las ubicaciones del lecho rocoso muestreado no estuvieron expuestas durante la época del Holoceno.

Conclusiones:

Los glaciares tropicales están probablemente en su menor extensión en al menos 11.700 años.
Este estudio proporciona la primera evidencia de una región importante que experimenta extensiones de glaciares pre-Holoceno.

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