1. ASSESSMENT OF ALBEDO CHANGES AND THEIR DRIVING FACTORS OVER THE QINGHAI-TIBETAN PLATEAU B. Zhang, L. Lei, Hao Zhang, L. Zhang and Z. Zen WE4.T06.4 - Geology and Solid Earth V Location: Room 12 Sension Time: July 27, 15:20 - 17:00 Presentation Time: July 27, 16:20 - 16:40 Vancouver, July 27

3. 1. Study area Average elevation : 4500m -> The roof of the world (2.5 mil km 2 ) Qinghai-Tibetan Plateau Qinghai-Tibetan Plateau global warming Ablation of glacier Grassland change Sensitive to climate change Lake Grasslands Snow and glacier

4. Land cover map ( Liu J., Liu, M., et al. 2003)

11. 2) Inter-annual albedo change driven by snow cover Maduo Maduo Variation of albedo consistently coincided with the snow cover changes Change trend of albedo Changes trends of snow cover

12. Changes trends of snow cover Temperature increasing trend Precipitation decreasing trend

13. Correlation between inter-annual average albedo coverage and snow coverage over the meteorological stations calculated by a buffer area of 100 km diameter circle centered the meteorological observation station Positive correlations between albedo and snow cover were larger almost over the areas of precipitation increases.

14. Maduo Maduo Change trend of summer albedo Changes trends of summer NDVI summer: from June to August 3) Inter-annual summer albedo change driven by vegetation

15. Correlation between inter-annual average summer albedo and summer NDVI over the meteorological stations calculated by a buffer area of 100 km diameter circle centered the meteorological observation station Negative correlations between albedo and NDVI and precipitation in some regions, but positive in other regions. Snow cover dominates in some regions, and vegetation dominates in others. The albedo change is induced both by snow change and vegetation change.