Tibet’s Ali: Asia’s Atacama?

The Ngari (Ali) prefecture of Tibet, one of the highest areas in the world, has recently emerged as a promising site for future astronomical observation.
Here we use 31 years of reanalysis data from the Climate Forecast System Reanalysis (CFSR) to examine the astroclimatology of Ngari, using the recently-erected Ali Observatory at Shiquanhe (5~047~m above mean sea level) as the representative site. We find the percentage of photometric night, median atmospheric seeing and median precipitable water vapor (PWV) of the Shiquanhe site to be 57%, 0.8″ and 2.5~mm, comparable some of the world’s best astronomical observatories.

Additional calculation supports the Shiquanhe region as one of the better sites for astronomical observations over the Tibetan Plateau. Based on the studies taken at comparable environment at Atacama, extraordinary observing condition may be possible at the few vehicle-accessible 6~000~m heights in the Shiquanhe region. Such possibility should be thoroughly investigated in future.

Quan-Zhi Ye, Meng Su, Hong Li, Xinmin Zhang
(Submitted on 3 Dec 2015)

Comments: MNRAS Letters in press
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:1512.01099 [astro-ph.IM] (or arXiv:1512.01099v1 [astro-ph.IM] for this version)
Submission history
From: Quan-Zhi Ye Mr
[v1] Thu, 3 Dec 2015 14:53:40 GMT (145kb)
http://arxiv.org/abs/1512.01099