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Needle ice observations from the high Drakensberg, Lesotho

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  • S. Grab

Abstract

Near‐surface ground thermal conditions are a delayed response to changing air temperature and may result in needle ice development when air temperatures are above 0 °C and ground temperatures below 0 °C. It is difficult, therefore, to predict needle ice development based only on climatological data. Observations indicate that temporally restricted growth phases produce shorter needle ice lengths than longer growth phases. Copyright © 2001 John Wiley & Sons, Ltd. RÉSUMÉ Les conditions thermiques proches de la surface du sol évoluent avec retard après un changement de la température de l'air, aussi des pipkrakes peuvent se développer quand la température de l'air est supérieure à 0 °C et que la température du sol est inférieure à 0 °C. Il est difficile, en conséquence, de prédire le développement des pipkrakes d'après les seules données climatologiques. Des observations indiquent que de courtes phases de croissance produisent des pipkrakes de longueur plus réduite que des phases de croissance de plus grande durée. Copyright © 2001 John Wiley & Sons, Ltd.

Suggested Citation

  • S. Grab, 2001. "Needle ice observations from the high Drakensberg, Lesotho," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 12(2), pages 227-231, April.
    • Handle: RePEc:wly:perpro:v:12:y:2001:i:2:p:227-231
    DOI: 10.1002/ppp.371
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