A simple physics-based improvement to the positive degree day model
A simple physics-based improvement to the positive degree day model
复制标题
对正度日模型的基于物理的简单改进
DOI:
10.1017/jog.2018.55
复制
发表时间:
2018
影响因子:
3.4
通讯作者:
RUAN, XIAOZHOU
中科院分区:
文献类型:
--
作者:
TSAI, VICTOR C.;RUAN, XIAOZHOU
Meltwater is important to understanding glacier health and dynamics. Since melt measurements are uncommon, ice ablation estimates are often based on models including the positive degree day (PDD) model. The PDD estimate is popular since it only requires air temperature as input, but suffers from the lack of physical motivation of an energy-balance model. We present a physics-based alternative to the PDD model that still only takes air/surface temperature as input. The model resembles the PDD model except accounting for time lags in ablation when cold ice needs to be warmed. The model is expressed as a differential equation with a single extra parameter related to the efficiency of heating a near-surface layer of ice. With zero thickness, the model reduces to the PDD model, providing a physical basis for the PDD model. Applying the model to data from Greenland, it improves modestly upon the PDD model, with the main improvement being better prediction of early season melting. This new model is a useful compromise, with some of the physics of more realistic models and the simplicity of a PDD model. The model should improve estimates of meltwater production and help constrain PDD parameters when empirical calibration is challenging.
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影响因子:
3.4
作者:
D. Wilton;A. Jowett;Edward Hanna;G. Bigg;M. Broeke;X. Fettweis;P. Huybrechts
通讯作者:
D. Wilton;A. Jowett;Edward Hanna;G. Bigg;M. Broeke;X. Fettweis;P. Huybrechts
DOI:
--
发表时间:
1989
期刊:
影响因子:
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通讯作者:
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DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
A. Arendt;M. Sharp
通讯作者:
M. Sharp
影响因子:
3.2
作者:
Marks, D;Domingo, J;Garen, D
通讯作者:
Garen, D