气候变化领域集成服务门户(CCPortal): Impacts of topographic shading on direct solar radiation for valley glaciers in complex topography

CCPortal

DOI	10.5194/tc-13-29-2019
	Impacts of topographic shading on direct solar radiation for valley glaciers in complex topography
	Olson M.; Rupper S.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	29
结束页码	40
卷号	13 期号:1
英文摘要	Topographic shading, including both shaded relief and cast shadowing, plays a fundamental role in determining direct solar radiation on glacier ice. However, shading has been oversimplified or incorrectly incorporated in surface energy balance models in some past studies. In addition, no systematic studies have been conducted to evaluate relationships between shading and other topographic characteristics. Here we develop a topographic solar radiation model to examine the variability in irradiance throughout the glacier melt season due to topographic shading and combined slope and aspect. We apply the model to multiple glaciers in high-mountain Asia (HMA) and test the sensitivity of shading to valley aspect and latitude. Our results show that topographic shading significantly alters the potential direct clear-sky solar radiation received at the surface for valley glaciers in HMA, particularly for north- and south-facing glaciers. Additionally, we find that shading can be extremely impactful in the ablation zone. Cast shadowing is the dominant mechanism in determining total shading for valley glaciers in parts of HMA, especially at lower elevations. Although shading can be predictable, it is overall extremely variable between glacial valleys. Our results suggest that topographic shading not only is an important factor contributing to surface energy balance but could also influence glacier response and mass balance estimates throughout HMA. © Author(s) 2019. All rights reserved.
学科领域	complexity; energy balance; glacier; irradiance; mass balance; melting; mountain region; shading; solar radiation; topography; Asia
语种	英语
scopus关键词	complexity; energy balance; glacier; irradiance; mass balance; melting; mountain region; shading; solar radiation; topography; Asia
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118954
作者单位	Department of Geography, University of Utah, Salt Lake City, UT 84112, United States
推荐引用方式 GB/T 7714	Olson M.,Rupper S.. Impacts of topographic shading on direct solar radiation for valley glaciers in complex topography[J],2019,13(1).
APA	Olson M.,&Rupper S..(2019).Impacts of topographic shading on direct solar radiation for valley glaciers in complex topography.The Cryosphere,13(1).
MLA	Olson M.,et al."Impacts of topographic shading on direct solar radiation for valley glaciers in complex topography".The Cryosphere 13.1(2019).