干旱区生态环境知识资源中心(Arid): Evaluation of fractional clear sky over potential astronomical sites

Arid

DOI	10.1093/mnras/stab1971
	Evaluation of fractional clear sky over potential astronomical sites
	Ningombam, Shantikumar S.; Song, H-J; Mugil, S. K.; Dumka, Umesh Chandra; Larson, E. J. L.; Kumar, Brijesh; Sagar, Ram
通讯作者	Ningombam, SS (corresponding author), Indian Inst Astrophys, Bangalore 560034, Karnataka, India. ; Song, HJ (corresponding author), Natl Inst Meteorol Sci, Seogwipo 63568, Jeju, South Korea. ; Dumka, UC (corresponding author), Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263001, India.
来源期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN	0035-8711
EISSN	1365-2966
出版年	2021
卷号	507 期号:3 页码:3745-3760
英文摘要	The estimation of the night-time cloud fraction (CF) is found to be one of the key parameters for evaluating the number of useful nights at an astronomical site. This work evaluates useful astronomical night-time observation over eight sites using a minimum threshold of CF from 21 years (2000-2020) of ground-based hourly visual and daily satellite data along with 41 years (1980-2020) of long-term hourly reanalysis data. The estimated number of photometric nights is underestimated by 8-24 per cent using the reanalysis data at Indian Astronomical Observatory-Hanle in comparison with the visual observations, while the estimated number of spectroscopic nights is 70-75 per cent per year and in good agreement with the visual observations. Among the astronomical sites, Paranal is found to be the best for astronomical observations, with 87 per cent spectroscopic nights per year. On the other hand, Hanle, Ali and Devasthal, located in the Himalayan region, exhibit an average of 68-78 per cent spectroscopic nights per year based on long-term reanalysis data, while Merak exhibits 61-68 per cent spectroscopic nights per year. Vertical profiles and global horizontal distributions for CF and related variable parameters are further compared among the sites. Global CF trends based on 41 years of reanalysis data show a decreasing tendency over most land regions and an increasing tendency over oceanic regions as well as over the Sahara desert, Middle East, and Indian subcontinent along the adjacent Tibetan Plateau. Such different CF trends between the ocean and land regions are thought to be the result of differential surface warming and water vapour changes associated with climate change.
英文关键词	atmospheric effects site testing
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000708848000043
WOS关键词	TELESCOPE ; WEATHER ; LAND
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364201
作者单位	[Ningombam, Shantikumar S.; Sagar, Ram] Indian Inst Astrophys, Bangalore 560034, Karnataka, India; [Song, H-J] Natl Inst Meteorol Sci, Seogwipo 63568, Jeju, South Korea; [Mugil, S. K.] St Josephs Coll Autonomous, Phys Dept, Bangalore 560027, Karnataka, India; [Dumka, Umesh Chandra; Kumar, Brijesh] Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263001, India; [Larson, E. J. L.] Univ Colorado, CIRES, Boulder, CO 80309 USA; [Larson, E. J. L.] NOAA, Chem Sci Lab, Boulder, CO 80305 USA
推荐引用方式 GB/T 7714	Ningombam, Shantikumar S.,Song, H-J,Mugil, S. K.,et al. Evaluation of fractional clear sky over potential astronomical sites[J],2021,507(3):3745-3760.
APA	Ningombam, Shantikumar S..,Song, H-J.,Mugil, S. K..,Dumka, Umesh Chandra.,Larson, E. J. L..,...&Sagar, Ram.(2021).Evaluation of fractional clear sky over potential astronomical sites.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,507(3),3745-3760.
MLA	Ningombam, Shantikumar S.,et al."Evaluation of fractional clear sky over potential astronomical sites".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 507.3(2021):3745-3760.