Improving the numerical stability of

Improving the numerical stability of the MAGIC model

MAGIC is one of the most widely used models for forecastinglong-term acidification. The model's code, however, has been experiencing numerical instability, though this might not be widely known to the public users. The major instability comes from the analytical solution to two cubic equations for calculating SO42-concentration and the exchangeable fraction of Al on the soils. The mathematical algorithm for calculating the concentration of SO42- from a quadratic equation is also found instable. This paper is aimed at improving the instability above through proved numericalalgorithms.

作 者： DENG Yi-xiang CHEN Ji-ning HU Xue-tao   作者单位： Department of Environment Sciences and Engineering,Tsinghua University,  刊 名： 环境科学学报(英文版)  ISTIC SCI 英文刊名： ENVIRON MENTAL SCIENCES  年，卷(期)： 2001 13(2)  分类号： X52 X0242  关键词：  

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