Towards large-scale daily snow density mapping with spatiotemporally aware model and multi-source data
-
Published:2023-01-09
Issue:1
Volume:17
Page:33-50
-
ISSN:1994-0424
-
Container-title:The Cryosphere
-
language:en
-
Short-container-title:The Cryosphere
Author:
Wang Huadong, Zhang XueliangORCID, Xiao Pengfeng, Che TaoORCID, Zheng Zhaojun, Dai LiyunORCID, Luan Wenbo
Abstract
Abstract. Snow density plays a critical role in estimating water
resources and predicting natural disasters such as floods, avalanches, and
snowstorms. However, gridded products for snow density are lacking for
understanding its spatiotemporal patterns. In this study, considering the
strong spatiotemporal heterogeneity of snow density, as well as the weak and
nonlinear relationship between snow density and the meteorological,
topographic, vegetation, and snow variables, the geographically and
temporally weighted neural network (GTWNN) model is constructed for
estimating daily snow density in China from 2013 to 2020, with the support
of satellite, ground, and reanalysis data. The leaf area index of high
vegetation, total precipitation, snow depth, and topographic variables are
found to be closely related to snow density among the 20 potentially
influencing variables. The 10-fold cross-validation results show that the
GTWNN model achieves an R2 of 0.531 and RMSE of 0.043 g cm−3,
outperforming the geographically and temporally weighted regression model
(R2=0.271), geographically weighted neural network model (R2=0.124), and reanalysis snow density product (R2=0.095), which
demonstrates the superiority of the GTWNN model in capturing the
spatiotemporal heterogeneity of snow density and the nonlinear relationship
to the influencing variables. The performance of the GTWNN model is closely
related to the state and amount of snow, in which more stable and plentiful
snow would result in higher snow density estimation accuracy. With the
benefit of the daily snow density map, we are able to obtain knowledge of
the spatiotemporal pattern and heterogeneity of snow density in China. The
proposed GTWNN model holds the potential for large-scale daily snow density
mapping, which will be beneficial for snow parameter estimation and water
resource management.
Funder
National Natural Science Foundation of China Fundamental Research Funds for the Central Universities
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference74 articles.
1. Barnett, T. P., Adam, J. C., and Lettenmaier, D. P.: Potential impacts of a
warming climate on water availability in snow-dominated regions, Nature,
438, 303–309, https://doi.org/10.1038/nature04141, 2005. 2. Bonner, H. M., Raleigh, M. S., and Small, E. E.: Isolating forest process effects
on modelled snowpack density and snow water equivalent, Hydrol.
Process., 36, E14475, https://doi.org/10.1002/hyp.14475, 2022. 3. Bormann, K. J., Westra, S., Evans, J. P., and McCabe, M. F.: Spatial and
temporal variability in seasonal snow density, J. Hydrol., 484,
63–73, https://doi.org/10.1016/j.jhydrol.2013.01.032, 2013. 4. Bormann, K. J., Brown, R. D., Derksen, C., and Painter, T. H.: Estimating
snow-cover trends from space, Nat. Clim. Change, 8, 924–928,
https://doi.org/10.1038/s41558-018-0318-3, 2018. 5. Breiman, L.: Random forests, Mach. Learn. 45, 5–32,
https://doi.org/10.1023/A:1010933404324, 2001.
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|