Thermal conductivity of porous ice in hailstone shells
Abstract The thermal conductivity and diffusivity of porous ice accreted on spherical and spheroidal hailstone models were measured over a density range of 620–915 kg m −3 . By scanning the evolving surface temperature distributions during cooling in a cold airflow the thermal conductivity was varie...
| Published in: | Journal of Glaciology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Cambridge University Press (CUP)
1996
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1017/s0022143000004056 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000004056 |
| Summary: | Abstract The thermal conductivity and diffusivity of porous ice accreted on spherical and spheroidal hailstone models were measured over a density range of 620–915 kg m −3 . By scanning the evolving surface temperature distributions during cooling in a cold airflow the thermal conductivity was varied in iterative fashion until the internal heat flux produced the correct surface temperature distribution. The results indicate a linear dependence of the thermal conductivity, k i , and diffusivity, α i , on density. For example, lowering the density by 10% lowers k i by 15%. Within the range of cloud conditions, the density variations affect the thermal parameters more than temperature does. The results also indicate a continuous decrease of the thermal conductivity from bulk ice via consolidated porous ice to loosely packed snow. |
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