The Waliguan Baseline Observatory (hereinafter referred to as “Observatory”) is located in the northeastern part of the Qinghai-Xizang Plateau, at an altitude of 3,816 m above sea level on the Waliguan Mountain in Qinghai, China. The Observatory was officially put into operation on September 17, 1994, and is the first large-scale atmospheric chemistry monitoring station established in Eurasia under the World Meteorological Organization (WMO)'s Global Atmosphere Watch (GAW) Programme. The Observatory has become an important platform for global monitoring and assessment of atmospheric chemistry and the environment, scientific analysis and experimental research.

Now, 30th Anniversary of the Establishment of the Waliguan Baseline Observatory is celebrated. Let's follow the footsteps of time, look back to its extraordinary course through unforgettable pictures and images!

On September 17, 1994, China Meteorological Administration (CMA) held an inauguration ceremony of the Observatory at Waliguan Mountain.

An early hand-held wind anemometer used at the Observatory.

The Observatory, newly constructed in 2023.

Geomorphology of the Observatory location.

Today's meteorological observation equipments in the Observatory.

Conducted meteorological observations and sampling.

Meteorologists of the Observatory were carrying out equipment maintenance.

On March 20, 2008, a group of German experts inspected the Observatory.

On June 18, 2008, 45 participants of the International Training Course on Climate Change visited the Observatory.

In 2009, the meteorologist of the Observatory participated in China's 25th Antarctic Scientific Expedition.

In November 2011, foreign experts and Qinghai meteorological technicians carried out scientific research experiments at the Observatory.

Variation of monthly average atmospheric carbon dioxide concentration at the Observatory.

All images are provided by Qinghai Provincial Meteorological Service

Editor: JIANG Zhiqing