气候变化领域集成服务门户(CCPortal): Thermal infrared emissivity of felsic-rich to mafic-rich analogues of hot planetary regoliths

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DOI	10.1016/j.epsl.2020.116089
	Thermal infrared emissivity of felsic-rich to mafic-rich analogues of hot planetary regoliths
	Ferrari S.; Maturilli A.; Carli C.; D'Amore M.; Helbert J.; Nestola F.; Hiesinger H.
发表日期	2020
ISSN	0012821X
卷号	534
英文摘要	Inner Solar System bodies with absent or extremely tenuous atmospheres such as Mercury and several high-eccentricity Near Earth Objects (NEOs) are subject to a wide range of surface temperatures. Here we show how the thermal expansion induced by strong diurnal insolation variations affects the thermal infrared spectra of felsic-rich to mafic-rich regoliths. 1400-700 cm−1 spectra of granular plagioclase-pyroxene mixtures were measured in the laboratory at four temperatures between 425 K and 725 K, simulating different daily surface temperatures within the Solar System. At the same time, we describe for the first time how two minerals with different thermal expansion coefficients combined in the same granular sample appear in a non-ambient (i.e., non-298 K) thermal infrared spectrum. The spectra of plagioclase-rich analogues appear to be dominated by felsic features regardless of the daily surface temperature, and do not exhibit any of the short-wavelength absorptions of pyroxenes. When detectable, on the other hand, the 870-cm−1 pyroxene absorption, which is not affected by thermal variations, functions instead as a proxy for the solid-solution composition (i.e., the Mg-Fe relative contents). In contrast, indications of the plagioclase solid solution occurring at ambient temperatures (i.e., Ca-Na relative contents) disappear at temperatures over 525 K. Christiansen feature position and spectral contrast, which show a clear dependency on composition even at high temperatures, require an accurate reproduction of the shallow thermal gradient in order to be used as indices. In general, in order to decipher planetary hyperspectral data, surface temperature acquisition seems to be a prerequisite, as well as a comparison with analogue spectra obtained under realistic environmental conditions. © 2020 Elsevier B.V.
关键词	emissivity plagioclase planetary pyroxene silicate temperature
英文关键词	Binary alloys; Calcium alloys; Cell proliferation; Electromagnetic wave emission; Expansion; Feldspar; Infrared radiation; Interplanetary flight; Iron alloys; Magnesium alloys; Silicates; Sodium alloys; Solid solutions; Spectroscopy; Surface properties; Temperature; Thermal expansion; emissivity; Environmental conditions; plagioclase; Plagioclase solid solutions; planetary; pyroxene; Solid solution composition; Thermal expansion coefficients; Atmospheric temperature; emissivity; mafic rock; plagioclase; pyroxene; regolith; silicate; solar system
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202582
作者单位	Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, Padova, 35131, Italy; German Aerospace Center (DLR), Institute for Planetary Research, Rutherfordstraße 23, Berlin, 12489, Germany; National Institute for Astrophysics (INAF), Institute for Space Astrophysics and Planetology, Via Fosso del Cavaliere 100, Roma, 00133, Italy; Department of Geosciences, University of Padua, via Gradenigo 6, Padova, 35131, Italy; University of Münster, Institute for Planetology, Wilhelm-Klemm-Str. 10, Münster, 48149, Germany
推荐引用方式 GB/T 7714	Ferrari S.,Maturilli A.,Carli C.,et al. Thermal infrared emissivity of felsic-rich to mafic-rich analogues of hot planetary regoliths[J],2020,534.
APA	Ferrari S..,Maturilli A..,Carli C..,D'Amore M..,Helbert J..,...&Hiesinger H..(2020).Thermal infrared emissivity of felsic-rich to mafic-rich analogues of hot planetary regoliths.Earth and Planetary Science Letters,534.
MLA	Ferrari S.,et al."Thermal infrared emissivity of felsic-rich to mafic-rich analogues of hot planetary regoliths".Earth and Planetary Science Letters 534(2020).