气候变化领域集成服务门户(CCPortal): Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China

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DOI	10.1029/2017MS001264
	Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China
	Zhang, Y. L.; Li, X.; Cheng, G. D.; Jin, H. J.; Yang, D. W.; Flerchinger, G. N.; Chang, X. L.; Wang, X.; Liang, J.
通讯作者	Zhang, YL (通讯作者)
发表日期	2018
ISSN	1942-2466
起始页码	1439
结束页码	1457
卷号	10 期号:7
英文摘要	The solar radiation incident in a mountainous area with a complex terrain has a strong spatial heterogeneity due to the variations in slope orientation (self-shading) and shadows cast by surrounding topography agents (topographic shading). Although slope self-shading has been well studied and considered in most land surface and hydrological models, topographic shading is usually ignored, and its influence on the thermal and hydrological processes in a cold mountainous area remains unclear. In this study, a topographic solar radiation algorithm with consideration for both slope self-shading and topographic shadows has been implemented and incorporated into a distributed hydrological model with physically based descriptions for the energy balance. A promising model performance was achieved according to a vigorous evaluation. In a control model without considering the topographic shadows, the simulated solar radiation incident in the study area was about 14.3W/m(2) higher on average, which in turn led to a higher simulated annual mean ground temperature at 4m (by 0.41 degrees C) and evapotranspiration (by 16.1mm/a), and a smaller permafrost extent (reduced by about 8%), as well as smaller maximal snow depth and shorter snow duration. Although the simulation was not significantly improved for discharge hydrograph in the base model, higher river runoff peaks and an increased runoff depth were obtained. In areas with a rugged terrain and deep valleys, the influences of topographic shadows would even be stronger in reality than the presented results, which cannot be ignored in the simulation of the thermal and hydrological processes, especially in a refined model.
关键词	HEIHE RIVER-BASIN WIRELESS SENSOR NETWORK SOLAR-RADIATION MODEL QINGHAI-TIBET PLATEAU SKY-VIEW FACTOR LAND-SURFACE SIMULTANEOUS HEAT FROZEN SOIL REFERENCE EVAPOTRANSPIRATION COMPLEX TOPOGRAPHY
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000441886300004
来源期刊	JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259341
推荐引用方式 GB/T 7714	Zhang, Y. L.,Li, X.,Cheng, G. D.,et al. Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China[J]. 中国科学院青藏高原研究所,2018,10(7).
APA	Zhang, Y. L..,Li, X..,Cheng, G. D..,Jin, H. J..,Yang, D. W..,...&Liang, J..(2018).Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China.JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS,10(7).
MLA	Zhang, Y. L.,et al."Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China".JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS 10.7(2018).