A Novel Surface Energy Balance Method for Thermal Inertia Studies of Terrestrial Analogs

IF 2.9 3区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Ari H. D. Koeppel, Christopher S. Edwards, Lauren A. Edgar, Scott Nowicki, Kristen A. Bennett, Amber Gullikson, Sylvain Piqueux, Helen Eifert, Daphne Chapline, A. Deanne Rogers
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Abstract

Surface thermal inertia derived from satellite imagery offers a valuable tool for remotely mapping the physical structure and water content of planetary regolith. Efforts to quantify thermal inertia using surface temperatures on Earth, however, have consistently yielded large uncertainties and suffered from a lack of reproducibility. Unlike dry or airless bodies, Earth's abundant water and dense atmosphere lead to dynamic thermophysical conditions that are a greater challenge to model than on a world like Mars. In this work, an approach was developed using field experiments to inform and fine-tune a thermophysical model of terrestrial sediment and calculate an inherent thermal inertia value with higher precision and less initial knowledge of the sediment than has previously been achieved remotely on Earth. A thermal inertia derived for a basaltic tephra site in Northern Arizona was replicated within 1% between different field seasons, demonstrating reproducibility. Model-derived values were validated in situ by two different thermophysical field probes to within 8% of the measured mean values. Analog studies such as this hold the promise of improved interpretations of surface materials on Mars, and an accurate thermal model for Earth is the key step to enabling translation between the two worlds.

Abstract Image

用于地球类似物热惯性研究的新型表面能量平衡法
卫星图像得出的地表热惯性为遥测行星碎屑的物理结构和含水量提供了宝贵的工具。然而,利用地球表面温度对热惯性进行量化的工作一直存在较大的不确定性,并且缺乏可重复性。与干燥或无空气的天体不同,地球丰富的水和稠密的大气导致了动态的热物理条件,与火星这样的世界相比,建立模型是一项更大的挑战。在这项工作中,利用现场实验开发了一种方法,为陆地沉积物的热物理模型提供信息并对其进行微调,以更高的精度和更少的沉积物初始知识计算出固有的热惯性值。为亚利桑那州北部的一个玄武质凝灰岩地点得出的热惯性值在不同野外季节之间的重复率在1%以内,证明了其可重复性。两个不同的热物理现场探测器对模型得出的数值进行了现场验证,结果与测量的平均值相差不超过 8%。像这样的模拟研究有望改进对火星表面材料的解释,而准确的地球热模型则是实现两个世界之间转换的关键一步。
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来源期刊
Earth and Space Science
Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
5.50
自引率
3.20%
发文量
285
审稿时长
19 weeks
期刊介绍: Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.
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