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环境学院发展报告

condition in the fracture are considered. With a constant-concentration source, we obtain

closed-form analytical solutions that account for the transport without reaction as well as
steady-state solutions with different first-order reactions in the two media. With a decay

source, a semi-analytical solution is obtained. Theanalytical and semi analytical s
olutions are in excellent agreement with the numerical simulation results obtained

using COMSOL Multiphysics. Sensitivity analysis is conducted to assess the relative
importance of matrix diffusion coefficient, fracture aperture, and matrix porosity. We conclude

that the first-order reaction as well as the matrix diffusion in the fractured rock would
decrease the solute peak concentration and shorten the penetration distance into the fracture.

The solutions can be applied to assess the spatial-temporal distribution of concentrations in t
he fracture and the matrix as well as to assess the contaminant mass stored in the rock matrix.

All of these are useful for designing remediation plans forcontaminated fractured rocks
or for risk assessment of contaminated fracture-matrix systems. (C) 2016 Elsevier B.V. All

rights reserved.
论文链接：https://doi.org/10.1016/j.jhydrol.2016.05.056

12. Linear additive impacts of Arctic sea ice reduction and La Niña on Northern
Hemisphere winter climate

作 者：Han, Z (Han, Zhe) [ 1,2 ] ; Li, SL ( 李双林 ) [ 1,2 ] ; Liu, JP (Liu, Jiping) [ 3 ] ; Gao,
YQ (Gao, Yongqi) [ 2,4 ] ; Zhao, P (Zhao, Ping) [ 5 ]

JOURNAL OF CLIMATE 卷 : 29 期 : 15 页 : 5513-5532 出版年 : AUG 2016

摘 要 ：Both Arctic sea ice loss and La Nina events can result in cold conditions in
midlatitude Eurasia in winter. Since the two forcings sometimes occur simultaneously,
determining whether they are independent of each other is undertaken first. The result suggests

an overall independence. Considering possible interactions between them, their coordinated im
pacts on the Northern Hemisphere winter climate are then investigated basedon observational

data analyses, historical simulation analyses from one coupled model (MPI-ESM-LR)
contributing to CMIP5, and atmospheric general circulation model sensitive experiments

in ECHAM5. The results show that the impacts of the two forcings are overall linearly
accumulated. In comparison with one single forcing, there is intensified cooling response in

midlatitude Eurasia along with northern warmer-southern cooler dipolar temperature responses
over North America. Despite the additive linearity, additive nonlinearity between the two

forcings is identifiable. The nonlinearity causes midlatitude Eurasian cooling weakened by

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