Abstract
AbstractThe Mogao Grottoes are located 1,800km west of Beijing, along the ancient Silk Road in northwestern China. The site consists of 492 decorated cave temples, containing one of the world's richest collections of Buddhist murals and statues. The number of visitors to the Mogao Grottoes is steadily increasing, and deterioration of the artifacts has accelerated. Since 1991, environmental monitoring has been conducted inside and outside the caves. Air temperature, relative humidity, carbon dioxide, wall temperature and number of visitors were monitored for over a year in two architecturally similar caves, one open to the public and the other closed. The entry of visitors produced transitory rapid changes in the microenvironment, which was otherwise stable. These shocks were caused by the ingress of outside (dry or humid) air. The stability of the microclimate can be improved by evenly distributing visitor numbers during opening hours, and by restricting the air exchange between the cave and the exterior ...
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