气候变化领域集成服务门户(CCPortal): Investigation of the Variability of Near-Surface Temperature Anomaly and Its Causes Over the Tibetan Plateau

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DOI	10.1029/2020JD032800
	Investigation of the Variability of Near-Surface Temperature Anomaly and Its Causes Over the Tibetan Plateau
	Liu Y.; Xue Y.; Li Q.; Lettenmaier D.; Zhao P.
发表日期	2020
ISSN	2169897X
卷号	125 期号:19
英文摘要	Recent research has reported the great influence of springtime land surface temperature (LST) and subsurface temperature (SUBT) over the Tibetan Plateau (TP) on downstream region summer precipitation, indicating the potential application of LST/SUBT on subseasonal to seasonal (S2S) prediction. In this study, we employed both observational data and offline model simulation to explore the memory of surface and subsurface variables and assess the driving effects of snow/albedo and SUBT on the LST anomaly. Our composite analysis based on observation shows that the anomalous LST in the TP can sustain for seasons and is accompanied by persistent SUBT as well as snow and associated surface albedo anomalies. A multilayer frozen soil model reproduces the observed LST anomaly and shows surface albedo and middle-layer SUBT have 1–3 months memory, indicating the degree of persistence or dissipation of anomaly through time with more extended memory during spring. With simulated middle-layer SUBT as a predictor, the linear regression model produces (Formula presented.) of 0.44 and 0.26 for 1- and 2-month LST prediction, respectively. The predictability is higher during the spring. Our results also show February snowfall, May snowmelt, and aero in snow exert substantial impacts on springtime LST through snow albedo feedback. The long memory of SUBT allows it to preserve the surface thermal anomaly and release it gradually in the following months to seasons. Meanwhile, the sensitivity study indicates that the soil properties and soil column depth predominate SUBT memory, which suggests the key processes to improve LST/SUBT then downstream S2S prediction. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	land surface temperature memory; subseasonal-to-seasonal prediction; subsurface temperature; surface albedo; Tibetan Plateau
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185729
作者单位	Department of Geography, University of California Los Angeles, Los Angeles, CA, United States; Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China
推荐引用方式 GB/T 7714	Liu Y.,Xue Y.,Li Q.,et al. Investigation of the Variability of Near-Surface Temperature Anomaly and Its Causes Over the Tibetan Plateau[J],2020,125(19).
APA	Liu Y.,Xue Y.,Li Q.,Lettenmaier D.,&Zhao P..(2020).Investigation of the Variability of Near-Surface Temperature Anomaly and Its Causes Over the Tibetan Plateau.Journal of Geophysical Research: Atmospheres,125(19).
MLA	Liu Y.,et al."Investigation of the Variability of Near-Surface Temperature Anomaly and Its Causes Over the Tibetan Plateau".Journal of Geophysical Research: Atmospheres 125.19(2020).