Terahertz and far-infrared windows opened at Dome A in Antarctica
Shi, Sheng-Cai1; Paine, Scott2; Yao, Qi-Jun1; Lin, Zhen-Hui1; Li, Xin-Xing1,8; Duan, Wen-Ying1; Matsuo, Hiroshi3; Zhang, Qizhou2; Yang, Ji1; Ashley, M. C. B.4; Shang, Zhaohui5,7; Hu, Zhong-Wen6
Source PublicationNATURE ASTRONOMY

The terahertz and far-infrared band, ranging from approximately 0.3 THz to 15 THz (1 mm to 20 mu m), is important for astrophysics as it hosts the peak of the thermal radiation of the cold component of the Universe as well as many spectral lines that trace the cycle of interstellar matter1-8. However, water vapour makes the terrestrial atmosphere opaque to this frequency band over nearly all of the Earth's surface9. Early radiometric measurements10 below 1 THz at Dome A (80 degrees 22'S, 77 degrees 21' E), the highest point of the cold and dry Antarctic ice sheet, suggest that this site may offer the best possible access for ground-based astronomical observations in the terahertz and far-infrared band. To fully assess the site conditions and to address the uncertainties in radiative transfer modelling of the atmosphere, we carried out measurements of atmospheric radiation from Dome A with a Fourier transform spectrometer, spanning the entire water vapour pure rotation band from 20 mu m to 350 mu m. Our measurements reveal substantial transmission in atmospheric windows throughout the whole band. By combining our broad-band spectra with data on the atmospheric state over Dome A, we set new constraints on the spectral absorption of water vapour at upper tropospheric temperatures, which is important for accurate modelling of the terrestrial climate. We find that current spectral models significantly underestimate the H2O continuum absorption.

Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000406527100001
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Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorShi, Sheng-Cai
Affiliation1.Chinese Acad Sci, Key Lab Radio Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Smithsonian Astrophys Observ, Cambridge, MA 02138 USA
3.Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
4.Univ New South Wales, Sydney, NSW 2052, Australia
5.Tianjin Normal Univ, Tianjin 300386, Peoples R China
6.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China
7.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
8.Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, Suzhou 215123, Peoples R China
Recommended Citation
GB/T 7714
Shi, Sheng-Cai,Paine, Scott,Yao, Qi-Jun,et al. Terahertz and far-infrared windows opened at Dome A in Antarctica[J]. NATURE ASTRONOMY,2017,1(1):7.
APA Shi, Sheng-Cai.,Paine, Scott.,Yao, Qi-Jun.,Lin, Zhen-Hui.,Li, Xin-Xing.,...&Hu, Zhong-Wen.(2017).Terahertz and far-infrared windows opened at Dome A in Antarctica.NATURE ASTRONOMY,1(1),7.
MLA Shi, Sheng-Cai,et al."Terahertz and far-infrared windows opened at Dome A in Antarctica".NATURE ASTRONOMY 1.1(2017):7.
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