New approaches to modeling the critical refreezing length of a Philberth melt probe for ice sheet exploration

IF 1.5 4区 地球科学 Q3 ECOLOGY
Yazhou Li , Pavel G. Talalay , Xiaopeng Fan , Bing Li , Liang Xu , Yuting Ye , Yue Wang
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Abstract

In recent years, interest in using Philberth melt probes in the exploration of subglacial lakes or extraterrestrial ice-covered planets has significantly increased. Consequently, several Philberth melt probes have been developed or are currently being developed. The critical refreezing length is a key parameter in determining the distribution of the lateral heater of the Philberth melt probe. In this study, two new approaches for calculating the critical refreezing length were proposed. Approach I was established based on the refreezing of a virtual borehole, whereas approach II was developed in the COMSOL Multiphysics 5.6a software by modeling the phase change of water and ice in the non-heated section of the Philberth melt probe. The two novel approaches were validated with the field test results of RECoverable Autonomous Sonde (RECAS) in Antarctica. The difference between the two approaches and the existing calculation methods was less than 32% and approach I presented a smaller critical refreezing length. The thermal head efficiency and ice temperature had significant influence on the critical refreezing length. Usually, the critical refreezing length increased with an increase in the thermal-head diameter, penetration rate, and ice temperature, whereas it decreased with an increase in the thermal head efficiency.

用于冰盖探测的Philberth融化探针临界再冻结长度建模的新方法
近年来,人们对使用Philberth熔体探测器探测冰下湖泊或地外冰雪覆盖的行星的兴趣显著增加。因此,一些Philberth熔体探针已经开发或正在开发中。临界再冻结长度是决定Philberth熔体探针侧加热器分布的关键参数。本文提出了两种计算临界再冻结长度的新方法。方法1是基于虚拟井眼的再冻结建立的,而方法2是在COMSOL Multiphysics 5.6a软件中通过模拟Philberth熔体探针非加热部分的水和冰的相变而开发的。这两种新方法在南极洲的可回收自主探空仪(RECAS)现场测试结果中得到了验证。两种方法与现有计算方法的差异小于32%,方法1的临界再冻结长度更小。热头效率和冰温对临界再冻结长度有显著影响。通常情况下,临界再冻结长度随热头直径、渗透率和冰温的增加而增大,而随热头效率的增加而减小。
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来源期刊
Polar Science
Polar Science ECOLOGY-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
3.90
自引率
5.60%
发文量
46
期刊介绍: Polar Science is an international, peer-reviewed quarterly journal. It is dedicated to publishing original research articles for sciences relating to the polar regions of the Earth and other planets. Polar Science aims to cover 15 disciplines which are listed below; they cover most aspects of physical sciences, geosciences and life sciences, together with engineering and social sciences. Articles should attract the interest of broad polar science communities, and not be limited to the interests of those who work under specific research subjects. Polar Science also has an Open Archive whereby published articles are made freely available from ScienceDirect after an embargo period of 24 months from the date of publication. - Space and upper atmosphere physics - Atmospheric science/climatology - Glaciology - Oceanography/sea ice studies - Geology/petrology - Solid earth geophysics/seismology - Marine Earth science - Geomorphology/Cenozoic-Quaternary geology - Meteoritics - Terrestrial biology - Marine biology - Animal ecology - Environment - Polar Engineering - Humanities and social sciences.
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