大落差山地边界层方案的订正及臭氧模拟

罗才桂; 樊晋; 刘梦璇; 颜廷昱; 苏有琦; 李茂善; 张小玲

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (10) : 5357-5366.

大气污染与控制

大落差山地边界层方案的订正及臭氧模拟

罗才桂^1,2, 樊晋^1,2,3, 刘梦璇^1,2, 颜廷昱⁴, 苏有琦^1,2, 李茂善^1,2, 张小玲^1,2

作者信息 +

Modification of the boundary layer scheme in complex terrain and evaluation of ozone simulation

LUO Cai-gui^1,2, FAN Jin^1,2,3, LIU Meng-xuan^1,2, YAN Ting-yu⁴, SU You-qi^1,2, LI Mao-shan^1,2, ZHANG Xiao-ling^1,2

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文章历史 +

摘要

通过在大落差山地开展边界层湍流脉动量观测,基于观测数据对一阶非局地边界层方案进行本地适用性订正,并评估订正后对臭氧的模拟性能.结果表明: 订正方案显著缓解了区域地面臭氧浓度的低估问题,将模拟偏差由−5.14×10^-9降低至−2.32×10^-9,其中臭氧平流与化学过程为改善的主要驱动因素.通过修改YSU (Yonsei University)边界层方案中的最小湍流扩散系数,不同下垫面高空臭氧浓度呈现出平流与垂直混合过程的相反贡献特征,揭示了大落差山地与毗邻平原在不同高度层臭氧输送机制的显著差异.研究成果为复杂地形区域边界层参数化优化与臭氧模拟精度提升提供了理论依据与方法支撑.

Abstract

The complex topographical conditions from the eastern Tibetan Plateau to the Chengdu Plain pose significant challenges for traditional boundary layer parameterization schemes, which in turn affects the accuracy of regional air quality models. To better understand these challenges, boundary layer turbulence flux observations were conducted in mountainous regions with substantial elevation variations. Based on these observations, a first-order nonlocal boundary layer scheme was refined for better applicability to local conditions, and its impact on ozone (O₃) simulations was assessed. The results show that the modified scheme improved WRF-Chem’s simulation of O₃ advection and chemical processes, reducing the surface O₃ concentration bias from -5.14 ×10^-9 to -2.32×10^-9, demonstrating improved model performance. Moreover, differences in O₃ advection and vertical mixing highlighted distinct transport mechanisms between the mountainous region and the adjacent plains, emphasizing the influence of complex terrain on regional air quality.

导出引用

罗才桂, 樊晋, 刘梦璇, 颜廷昱, 苏有琦, 李茂善, 张小玲. 大落差山地边界层方案的订正及臭氧模拟[J]. 中国环境科学. 2025, 45(10): 5357-5366

LUO Cai-gui, FAN Jin, LIU Meng-xuan, YAN Ting-yu, SU You-qi, LI Mao-shan, ZHANG Xiao-ling. Modification of the boundary layer scheme in complex terrain and evaluation of ozone simulation[J]. China Environmental Science. 2025, 45(10): 5357-5366

中图分类号： X511

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