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Sciences in Cold and Arid Regions ›› 2020, Vol. 12 ›› Issue (2): 95–103.doi: 10.3724/SP.J.1226.2020.00095.

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  • 收稿日期:2020-01-05 接受日期:2020-02-10 出版日期:2020-04-30 发布日期:2020-04-27

Spatial and temporal transferability of Degree-Day Model and Simplified Energy Balance Model: a case study

HuiLin Li1,2()   

  1. 1.State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
    2.Tianshan Glaciological Station, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
  • Received:2020-01-05 Accepted:2020-02-10 Online:2020-04-30 Published:2020-04-27
  • Contact: HuiLin Li E-mail:lihuilin@lzb.ac.cn

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Abstract:

Glacier mass balance, the difference between accumulation and ablation at the glacier surface, is the direct reflection of the local climate regime. Under global warming, the simulation of glacier mass balance at the regional scale has attracted increasing interests. This study selects Urumqi Glacier No. 1 as the testbed for examining the transferability in space and time of two commonly used glacier mass balance simulation models: i.e., the Degree-Day Model (DDM) and the simplified Energy Balance Model (sEBM). Four experiments were carried out for assessing both models' temporal and spatial transferability. The results show that the spatial transferability of both the DDM and sEBM is strong, whereas the temporal transferability of the DDM is relatively weak. For all four experiments, the overall simulation effect of the sEBM is better than that of the DDM. At the zone around Equilibrium Line Altitude (ELA), the DDM performed better than the sEBM. Also, the accuracy of parameters, including the lapse rate of air temperature and vertical gradient of precipitation at the glacier surface, is of great significance for improving the spatial transferability of both models.

Key words: Degree-Day Model, Simplified Energy Balance Model, temporal and spatical transferability, Urumqi Glacier No. 1

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ParametersValueUnit
DDF for ice15mm/(d?°C)
DDF for snow1.8mm/(d?°C)
Lapse rate for air temperature0.0052°C/m
Vertical gradient for precipitation26mm/100 m

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ParametersValueUnit
c01-129W/m2
c02-0.007W/m3
c121W/(m2?K)
c20W/(m2?K2)
Lapse rate for air temperature0.006°C/m
Vertical gradient for precipitation22mm/100 m

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