The Impact of Model Horizontal Resolution on Aerosol Modeling Over East Asia Using Variable-Resolution CESM2

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Weiyi Wang, Xiaohong Liu, Guangxing Lin, Zheng Lu, Chenglai Wu
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Abstract

To quantify uncertainties and reduce biases in aerosol modeling over East Asia, we run the Community Earth System Model version 2 at variable-resolution (VR-CESM) with the highest resolution at ∼0.125° over East Asia and globally quasi-uniform resolution at ∼1° (UN-CESM) to investigate responses of simulated aerosol to model resolution. The subgrid variability of aerosol and precursor gas emissions is better represented at the higher resolution. The budget analysis of aerosols in eastern China shows that wet/dry deposition is not sensitive to the model resolution, but sulfate formation (e.g., sulfuric acid gas condensation and aqueous-phase chemistry) increases and aerosol transport out of the region decreases as the resolution increases, which lead to increased aerosol burden and lifetime. Compared to UN-CESM, VR-CESM simulates stronger descending motion along the mountain edge and blocking effects of mountain peaks, which weakens the dispersion of aerosols over the Taihang Mountains and Sichuan Basin. In comparison to surface observations, VR-CESM simulates higher aerosol concentrations in urban areas than UN-CESM does. Over eastern China, increasing model resolution improves the simulated aerosol optical depth (AOD) in terms of spatial distribution and magnitude. Over northern (southwestern) China, the simulated AOD increases by ∼17% (∼32%) with increasing resolution and becomes more comparable to satellite retrievals. The improvements are more significant in urban areas and regions with complex terrains than in rural and coastal areas. The regional annual-mean aerosol direct radiative effect in eastern China simulated by VR-CESM increases by ∼54% (−1.08 W/m2 more cooling) at the top of the atmosphere compared to UN-CESM.

Abstract Image

模式水平分辨率对东亚变分辨率CESM2气溶胶模拟的影响
为了量化东亚气溶胶模拟中的不确定性并减少偏差,我们在变分辨率(VR-CESM)下运行社区地球系统模式2,东亚地区最高分辨率为~ 0.125°,全球准均匀分辨率为~ 1°(UN-CESM),以研究模拟气溶胶对模式分辨率的响应。在更高的分辨率下,气溶胶和前体气体排放的亚网格变异性得到了更好的表现。对中国东部气溶胶的预算分析表明,干湿沉降对模式分辨率不敏感,但随着分辨率的增加,硫酸盐形成(如硫酸气体冷凝和水相化学)增加,气溶胶向区域外输送减少,导致气溶胶负担和寿命增加。与UN-CESM相比,VR-CESM模拟了更强的沿山边缘下降运动和山峰阻塞效应,从而减弱了太行山和四川盆地上空气溶胶的弥散。与地面观测相比,VR-CESM模拟的城市地区气溶胶浓度高于UN-CESM。在中国东部地区,模式分辨率的提高提高了模拟气溶胶光学深度(AOD)的空间分布和量级。在中国北部(西南),模拟AOD随着分辨率的增加增加了~ 17%(~ 32%),并变得与卫星反演更具可比性。与农村和沿海地区相比,城市地区和地形复杂地区的改善更为显著。与UN-CESM相比,VR-CESM模拟的中国东部地区年平均气溶胶直接辐射效应在大气顶部增加了约54% (- 1.08 W/m2)。
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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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