Tibet's Ali: Asia's Atacama?

Ye, Quanzhi; Su, Meng; Li, Hong; Zhang, Xinmin

doi:10.1093/mnrasl/slv188

Cited by 15 publications

(8 citation statements)

References 18 publications

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“…The proposed Northern Hemispheric sites Ali, Tibet and Summit Camp, Greenland are comparable to Atacama, although both sites are noticeably cloudier. Before this paper, 2D weather data from CFSR have been used to evaluate the Ali site [7]. Although the results in that work show initial promise of Ali, they are limited by a combination of grid resolution and the lack of altitude information.…”

Section: Introductionmentioning

confidence: 99%

Assessments of Ali, Dome A, and Summit Camp for mm-wave Observations Using MERRA-2 Reanalysis

Kuo

2017

ApJ

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NASA's latest MERRA-2 reanalysis of the modern satellite measurements provides unprecedented uniformity and fidelity for the atmospheric data. In this paper, these data are used to evaluate five sites for millimeter-wave (mm-wave) observations. These include two established sites (South Pole and Chajnantor, Atacama), and three new sites (Ali, Tibet; Dome A, Antarctica; and Summit Camp, Greenland). Atmospheric properties including precipitable water vapor (PWV), sky brightness temperature fluctuations, ice and liquid water paths are derived and compared. Dome A emerges to be the best among those evaluated, with PWV and fluctuations smaller than the second-best site, South Pole, by more than a factor of 2. It is found that the higher site in Ali (6,100 m) is on par with Cerro Chajnantor (5,612 m) in terms of transmission and stability. The lower site in Ali (5,250 m) planned for first stage of observations at 90/150GHz provides conditions comparable to those on the Chajnantor Plateau. These analyses confirm Ali to be an excellent mm-wave site on the Northern Hemisphere that will complement well-established sites on the Southern Hemisphere. It is also found in this analysis that the observing conditions at Summit Camp are comparable to Cerro Chajnantor. Although it is more affected by the presence of liquid water clouds.

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Section: Introductionmentioning

confidence: 99%

Assessments of Ali, Dome A, and Summit Camp for mm-wave Observations Using MERRA-2 Reanalysis

Kuo

2017

ApJ

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“…In Figure 2 we plot, as a function of PWV, the fraction of time during which the water vapor condition is better than a specific PWV value. References [9,10] have also done the atmospherical conditions evaluation for Ali region.…”

Section: Overview Of the Alicpt Sitementioning

confidence: 99%

“…Ye et al. [ 9 ] and Kuo [ 10 ] have also evaluated the atmospheric conditions of the Ali region. Sky coverage: The AliCPT site is located at the geographical coordinates (80° 01′ 50′ E, 32° 18′ 38″ N).…”

Section: Overview Of the Alicpt Sitementioning

confidence: 99%

Probing primordial gravitational waves: Ali CMB Polarization Telescope

Liu

et al. 2018

National Science Review

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In this paper, we will give a general introduction to the project of Ali CMB Polarization Telescope (AliCPT), which is a Sino-US joint project led by the Institute of High Energy Physics (IHEP) and involves many different institutes in China. It is the first ground-based cosmic microwave background (CMB) polarization experiment in China and an integral part of China's Gravitational Waves Program. The main scientific goal of AliCPT project is to probe the primordial gravitational waves (PGWs) originated from the very early Universe.The AliCPT project includes two stages. The first stage referred to as AliCPT-1, is to build a telescope in the Ali region of Tibet with an altitude of 5,250 meters. Once completed, it will be the worldwide highest ground-based CMB observatory and open a new window for probing PGWs in northern hemisphere. AliCPT-1 telescope is designed to have about 7,000 TES detectors at 95GHz and 150GHz. The second stage is to have a more sensitive telescope (AliCPT-2) with the number of detectors more than 20,000.Our simulations show that AliCPT will improve the current constraint on the tensor-to-scalar ratio r by one order of magnitude with 3 years' observation. Besides the PGWs, the AliCPT will also enable a precise measurement on the CMB rotation angle and provide a precise test on the CPT symmetry. We show 3 years' observation will improve the current limit by two order of magnitude. * Invited Paper for N ational Science Review 1 BICEP2 collaboration [6] announced in 2014 the detection of B-mode, which however turns out to be the dust emissions dominate, not the signal of PGWs [7].From the aerial view around Ali astronomical observatory at A1 point (left panel of Figure 4), we can see that, AliCPT site at B1 is not far from A1 point, the distance between them is only about 1km. The concrete road

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“…The ESO SCIDAR data were obtained using a Stereo-SCIDAR instrument developed by Durham University (Shepherd et al 2014). The Tibet Ali site is considered to be one of the best sites in east Asia (Liu et al 2015a;Ye et al 2016) and has been selected as one of the potential sites for the LOT. The site-testing data are obtained with the method discussed in Liu et al (2010), Liu et al (2013) and Liu et al (2015b).…”

Section: A S E R G U I D E S Ta R S Y S T E M S T U Dymentioning

confidence: 99%

OUP accepted manuscript

Jia

Basden

Osborn

2018

MNRAS

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Tibet's Ali: Asia's Atacama?

Cited by 15 publications

References 18 publications

Assessments of Ali, Dome A, and Summit Camp for mm-wave Observations Using MERRA-2 Reanalysis

Assessments of Ali, Dome A, and Summit Camp for mm-wave Observations Using MERRA-2 Reanalysis

Probing primordial gravitational waves: Ali CMB Polarization Telescope

OUP accepted manuscript

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