4.6 Article

Improvement of distributed snowmelt energy balance modeling with MODIS-based NDSI-derived fractional snow-covered area data

期刊

HYDROLOGICAL PROCESSES
卷 25, 期 4, 页码 650-660

出版社

JOHN WILEY & SONS LTD
DOI: 10.1002/hyp.7857

关键词

hydrology; snow; remote sensing; arctic

资金

  1. NSF-Idaho EPSCoR
  2. National Science Foundation [EPS-0447689, EPS-0814387]
  3. Idaho Space Grant Consortium
  4. Directorate For Geosciences
  5. Division Of Earth Sciences [0930055] Funding Source: National Science Foundation
  6. Div Of Chem, Bioeng, Env, & Transp Sys
  7. Directorate For Engineering [0854522] Funding Source: National Science Foundation

向作者/读者索取更多资源

Describing the spatial variability of heterogeneous snowpacks at a watershed or mountain-front scale is important for improvements in large-scale snowmelt modelling. Snowmelt depletion curves, which relate fractional decreases in snow-covered area (SCA) against normalized decreases in snow water equivalent (SWE), are a common approach to scale-up snowmelt models. Unfortunately, the kinds of ground-based observations that are used to develop depletion curves are expensive to gather and for large areas. We describe an approach incorporating remotely sensed fractional SCA (FSCA) data with coinciding daily snowmelt SWE outputs during ablation to quantify the shape of a depletion curve. We joined melt estimates from the Utah Energy Balance Snow Accumulation and Melt Model (UEB) with FSCA data calculated from a normalized difference snow index snow algorithm using NASA's moderate resolution imaging spectroradiometer (MODIS) visible (0.545-0.565 mu m) and shortwave infrared (1.628-1.652 mu m) reflectance data. We tested the approach at three 500 m(2) study sites, one in central Idaho and the other two on the North Slope in the Alaskan arctic. The UEB-MODIS-derived depletion curves were evaluated against depletion curves derived from ground-based snow surveys. Comparisons showed strong agreement between the independent estimates. Copyright (C) 2010 John Wiley & Sons, Ltd.

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