Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR024935 |
High-Resolution Snowline Delineation From Landsat Imagery to Infer Snow Cover Controls in a Himalayan Catchment | |
Girona-Mata, Marc1; Miles, Evan S.2; Ragettli, Silvan3; Pellicciotti, Francesca2,4 | |
2019-08-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:8页码:6754-6772 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; England |
英文摘要 | The snow cover dynamics of High Mountain Asia are usually assessed at spatial resolutions of 250 m or greater, but this scale is too coarse to clearly represent the rugged topography common to the region. Higher-resolution measurement of snow-covered area often results in biased sampling due to cloud cover and deep shadows. We therefore develop a Normalized Difference Snow Index-based workflow to delineate snow lines from Landsat Thematic Mapper/Enhanced Thematic Mapper+ imagery and apply it to the upper Langtang Valley in Nepal, processing 194 scenes spanning 1999 to 2013. For each scene, we determine the spatial distribution of snow line altitudes (SLAs) with respect to aspect and across six subcatchments. Our results show that the mean SLA exhibits distinct seasonal behavior based on aspect and subcatchment position. We find that SLA dynamics respond to spatial and seasonal trade-offs in precipitation, temperature, and solar radiation, which act as primary controls. We identify two SLA spatial gradients, which we attribute to the effect of spatially variable precipitation. Our results also reveal that aspect-related SLA differences vary seasonally and are influenced by solar radiation. In terms of seasonal dominant controls, we demonstrate that the snow line is controlled by snow precipitation in winter, melt in premonsoon, a combination of both in postmonsoon, and temperature in monsoon, explaining to a large extent the spatial and seasonal variability of the SLA in the upper Langtang Valley. We conclude that while SLA and snow-covered area are complementary metrics, the SLA has a strong potential for understanding local-scale snow cover dynamics and their controlling mechanisms. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490973700023 |
WOS关键词 | TRANSIENT SNOWLINE ; AIR-TEMPERATURE ; SOLAR-RADIATION ; RIVER-BASIN ; GLACIER ; VARIABILITY ; RUNOFF ; PRECIPITATION ; ELEVATION ; ALTITUDE |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/185863 |
专题 | 资源环境科学 |
作者单位 | 1.Swiss Fed Inst Technol, Inst Environm Engn, Zurich, Switzerland; 2.Swiss Fed Res Inst WSL, Birmensdorf, Switzerland; 3.Hydrosolutions Ltd, Zurich, Switzerland; 4.Northumbria Univ, Dept Geog, Newcastle Upon Tyne, Tyne & Wear, England |
推荐引用方式 GB/T 7714 | Girona-Mata, Marc,Miles, Evan S.,Ragettli, Silvan,et al. High-Resolution Snowline Delineation From Landsat Imagery to Infer Snow Cover Controls in a Himalayan Catchment[J]. WATER RESOURCES RESEARCH,2019,55(8):6754-6772. |
APA | Girona-Mata, Marc,Miles, Evan S.,Ragettli, Silvan,&Pellicciotti, Francesca.(2019).High-Resolution Snowline Delineation From Landsat Imagery to Infer Snow Cover Controls in a Himalayan Catchment.WATER RESOURCES RESEARCH,55(8),6754-6772. |
MLA | Girona-Mata, Marc,et al."High-Resolution Snowline Delineation From Landsat Imagery to Infer Snow Cover Controls in a Himalayan Catchment".WATER RESOURCES RESEARCH 55.8(2019):6754-6772. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论