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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.
	2015
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.
出处	Proceedings of the National Academy of Sciences of the United States of America
卷	112
期	30
页	9299-9304
收录类别	SCI
语种	英语
ISSN号	0027-8424
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/38833]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	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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