US-IALE 2018 has ended

Monday, April 9 • 5:30pm - 7:00pm
POSTER: Interdependent of ET-LAI-Albedo Across the Roofing Landscapes: Mongolian and Tibetan Plateaus

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AUTHORS: Li Tian*, Qianyanzhou Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; Jiquan Chen, Ranjeet John – CGCEO and Department of Geography, Environment, and Spatial Sciences, Michigan State University, USA; Changliang Shao, Xiaoping Xin – National Hulunber Grassland Ecosystem Observation and Research Station / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China

ABSTRACT: The rapidly changing climate and land use has produced abnormally large consequences on ecosystem functions in high latitude and high altitude regions. Leaf area index (LAI), evapotranspiration (ET), and land surface albedo are among the most sensitive land surface properties in response to these changes, which may also result in feedback effects on regional climate. Our study objective is to explore the interdependent dynamics of these three variables, as well as the underlying regulations on two roofing landscapes in Asia during 2000-20014: Mongolia and the Tibetan Plateau (MP and TP, respectively). While the range of ET, albedo and LAI was 0-31 mm/M, 0.11-0.5 and 0-2.8 for TP, and 0-44 mm/M, 0.10-0.6 and 0-2.9 for MP, ET and albedo showed much higher spatial variability than LAI on both plateaus. The total land area with significant intraannual change of ET and albedo was 4.75x105 and 0.44×105 km2, but with a 3.79×105 km2 (78.30%) and 0.32×105 km2 (72.73%) decrease, and a 0.96×105 km2 (27. 72%) and 0.12×105km2 (27.27%) increase on TP. For MP, the corresponding figures were 3.11×105 km2, with a 0.28×105 km2 (9.06%) decrease and 2.83×105 km2 (90.93%) increase in ET, and 0.64×105 km2 (58.18%) and 0.46×105km2 (41.82%) for albedo. The interannual variation measured by coefficient of variation was smaller on the TP than that on the MP. More importantly, the above changes are dependent of cover types, suggesting landscape structures are partially responsible for the spatial variations of the changes. Finally, it seemed that the decreasing trends in ET and LAI on the TP were contributed mostly by the mid-growing season (July-August), due likely to an advanced growing season (i.e., no change in the end-date). On the MP, all three variables were contributed mostly by the mid-growing season, without significant changes in growing season length.

Monday April 9, 2018 5:30pm - 7:00pm
Monroe Room

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