Long-term analysis of clear nights using satellite data considering astronomical sites in western China

Cao, Zihuang; Liu, Liyong; Zhao, Yi; Lu, Feng; Jones, H. R. A.; Shen, Hao; Hao, Jinxin; Xue, Yan-Jie; Yao, Yulong; Xu, Jing; Esamdin, Ali; Qi, Zhaoxiang; Shi, Jianrong; Li, Jian; Tian, Yuan; Wang, Zheng; Yan, Tai-Sheng; Wang, Xia; Xiong, Jian-Ping; Yu, Sheng‐Xiang; Zhang, Junbo; Shen, Zhenxing; Jiang, Yingde; Yin, Jian-Tao; Pu, Guang-Xin; Wei, Peng; Bai, C. H.; Feng, Guojie; Ma, Lihua; Song, Tengfei; Wang, Jianfeng; Jian-feng, Tian; Zeng, Xingguo; Hou, Zhi-Gang; Liao, S.; Cao, Zhi-Song; Fan, Dongwei; Xu, Yunfei; Li, Changhua; Tao, Yihan

doi:10.1088/1674-4527/20/6/81

Cited by 15 publications

(12 citation statements)

References 26 publications

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“…We also applied our method to two astronomical sites in China, Ali-A and Daocheng. The average fractions of observable nights of Ali-A and Daocheng derived from our method agree with the results from Cao et al (2020) and Feng et al (2020). Moreover, we calculated the average distribution of the FONs above China from 2008 to 2019.…”

Section: Discussionsupporting

confidence: 81%

“…Cao et al (2020) used meteorological data from the satellite of National Oceanic and Atmospheric Administration (NOAA) and GMS to analyze cloud coverage and employed data from the Moderate Resolution Imaging Spectroradiometer (MODIS) on 5. For Ali-A and Daocheng, 89% of the absolute differences between the results from our work and from Cao et al (2020) and Feng et al (2020) are less than 10%, which indicates good agreements. The yearly FONs of these two sites are presented in Figure 3.…”

Section: Comparative Analysis and Discussionmentioning

confidence: 99%

“…Moreover, due to the high altitude of the Yun-Gui plateau, Daocheng is endowed with good observing conditions, which provides FONs of more than 70%. Note: 'C20' and 'F20' mean Cao et al (2020) and Feng et al (2020) respectively. 'Diff' is the difference between the results from previous works (Cao et al 2020;Feng et al 2020) and this work.…”

Section: Comparative Analysis and Discussionmentioning

confidence: 99%

“…Note: 'C20' and 'F20' mean Cao et al (2020) and Feng et al (2020) respectively. 'Diff' is the difference between the results from previous works (Cao et al 2020;Feng et al 2020) and this work. It is also worth noting that a) the FONs of 2017 does not include the first three months, because Feng et al (2020) did not present complete data of them, b) the FONs of 2018 for Daocheng excludes the period of May-July due to the non-operation of the all-sky camera.…”

Section: Comparative Analysis and Discussionmentioning

confidence: 99%

“…Erasmus & Sarazin (2001& Sarazin ( , 2002 and Erasmus & van Rooyen (2006) proved the feasibility of Recently, site testing campaign for the Large Optical/infrared Telescope (LOT) of China, a ground-based 12 m diameter telescope, is undergoing (e.g., Cao et al 2020;Feng et al 2020), which motivates us to search for the potential best sites in China. Up to now, almost the best sites are located in the Western Hemisphere (Vernin et al 2008;Schöck et al 2009).…”

Section: Sincementioning

confidence: 99%

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New analysis of the fraction of observable nights at astronomical sites based on FengYun-2 satellite data

Wang,

Wu,

Liu

et al. 2022

Preprint

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The fraction of observable nights is an essential parameter for selecting astronomical sites. In recent years, meteorological satellite data have played an essential role in recognising and providing statistics of observable nights. We present a method to estimate the fraction of observable nights based on the FengYun-2 series of geostationary meteorological satellites and weather records of multiple astronomical sites. We have calculated the fraction of observable nights at 27 sites in Indonesia and two astronomical sites in China to validate the method. The results derived from our method show good agreement with previous works. Furthermore, we have derived the yearly distribution of the fraction of observable nights above China, which indicates the area near 40 • N has more observable nights than other areas in China.

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Section: Discussionsupporting

confidence: 81%

Section: Comparative Analysis and Discussionmentioning

confidence: 99%

Section: Comparative Analysis and Discussionmentioning

confidence: 99%

Section: Comparative Analysis and Discussionmentioning

confidence: 99%

Section: Sincementioning

confidence: 99%

See 3 more Smart Citations

New analysis of the fraction of observable nights at astronomical sites based on FengYun-2 satellite data

Wang,

Wu,

Liu

et al. 2022

Preprint

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Geographical-environmental factors extraction and analysis for optical astronomical site selection based on multi-source remote sensing in Lenghu, Qinghai Province

2022

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At present, there are scarce sites that can require high-quality astronomical observations over the world, therefore, analysis of geographical-environmental factors and extraction of the potential places for astronomical observations is of significance. Remote sensing has the specific advantage for rapid and widespread monitoring and geo-spatial analysis. In this paper, Precipitable Water Vapor (PWV), clear nights, altitude and surface coverage, these four parameters associated with optical astronomical observation was selected, Analytic Hierarchy Process (AHP) evaluating model was adopted to determine the weighting parameters and calculated geo-environmental suitability. The results show that: (1) The lenghu region is characterized by seasonal variation with high PWV in summer and low PWV in the winter, representing non-summer periods are the best observation time. (2) The Lenghu region has relatively high clear nights with more than half of times through one year is suitable for observation. (3) Based on Geoenvironmental suitability mapping,Saishiteng Mountain is selected as a priority site for optical astronomical sites.

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Preface: Site testing campaign for the Large Optical/infrared Telescope of China

Hao

2020

Res. Astron. Astrophys.

Self Cite

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The Large Optical/infrared Telescope of China is a 12 meter diameter ground-based optical/infrared telescope which is proposed to be constructed in the western part of China in favor of its arid climate, and clear, dark nights. A site testing campaign was initiated between November 2016 and March 2019 in order to investigate long term astronomical weather conditions in the western part of China, specifically, at three sites: Ali in Tibet, Daocheng in Sichuan and Muztagh-ata in Xinjiang. This is the first attempt to evaluate long term performances of three candidate sites with uniformly calibrated instruments and data collecting/processing methods for a two-year span in China. In this special issue, we present nine papers that describe the whole site testing campaign, including preparation, data collecting/processing methods, instrument set up at three candidate sites as well as detailed statistics for the measurement results from March 2017 to March 2019.

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Long-term analysis of clear nights using satellite data considering astronomical sites in western China

Cited by 15 publications

References 26 publications

New analysis of the fraction of observable nights at astronomical sites based on FengYun-2 satellite data

New analysis of the fraction of observable nights at astronomical sites based on FengYun-2 satellite data

Geographical-environmental factors extraction and analysis for optical astronomical site selection based on multi-source remote sensing in Lenghu, Qinghai Province

Preface: Site testing campaign for the Large Optical/infrared Telescope of China

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