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Evaporative cooling over the Tibetan Plateau induced by vegetation growth
Shen M. G.; Piao, S. L.; Jeong, S. J.; Zhou, L. M.; Zeng, Z. Z.; Ciais, P.; Chen, D. L.; Huang, M. T.; Jin, C. S.; Li, L. Z. X.; Li, Y.; Myneni, R. B.; Yang, K.; Zhang, G. X.; Zhang, Y. J.; Yao, T. D.
出处Proceedings of the National Academy of Sciences of the United States of America
2015
112
30
9299-9304
关键词Climate Change Feedback Evapotranspiration Vegetation Tibetan Plateau Diurnal Temperature-range Climate-change Convective Parameterization Alpine Meadow Impacts Modis Radiation Model Precipitation Sensitivity
英文摘要In the Arctic, climate warming enhances vegetation activity by extending the length of the growing season and intensifying maximum rates of productivity. In turn, increased vegetation productivity reduces albedo, which causes a positive feedback on temperature. Over the Tibetan Plateau (TP), regional vegetation greening has also been observed in response to recent warming. Here, we show that in contrast to arctic regions, increased growing season vegetation activity over the TP may have attenuated surface warming. This negative feedback on growing season vegetation temperature is attributed to enhanced evapotranspiration (ET). The extra energy available at the surface, which results from lower albedo, is efficiently dissipated by evaporative cooling. The net effect is a decrease in daily maximum temperature and the diurnal temperature range, which is supported by statistical analyses of in situ observations and by decomposition of the surface energy budget. A daytime cooling effect from increased vegetation activity is also modeled from a set of regional weather research and forecasting (WRF) mesoscale model simulations, but with a magnitude smaller than observed, likely because the WRF model simulates a weaker ET enhancement. Our results suggest that actions to restore native grasslands in degraded areas, roughly one-third of the plateau, will both facilitate a sustainable ecological development in this region and have local climate cobenefits. More accurate simulations of the biophysical coupling between the land surface and the atmosphere are needed to help understand regional climate change over the TP, and possible larger scale feedbacks between climate in the TP and the Asian monsoon system.
收录类别SCI
语种英语
ISSN号0027-8424
DOI标识10.1073/pnas.1504418112
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被引频次:92[WOS]   [WOS记录]     [WOS相关记录]
文献类型SCI/SSCI论文
条目标识符http://ir.igsnrr.ac.cn/handle/311030/38833
专题历年回溯文献
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Shen M. G.,Piao, S. L.,Jeong, S. J.,et al. Evaporative cooling over the Tibetan Plateau induced by vegetation growth. 2015.
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