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Distributions and regional budgets of aerosols and their precursors simulated with the EMAC chemistry-climate model

机译:气溶胶的分布和区域预算及其与EMAC化学 - 气候模型模拟的前体

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The new global anthropogenic emission inventory (EDGAR-CIRCE) of gas and aerosol pollutants has been incorporated in the chemistry general circulation model EMAC (ECHAM5/MESSy Atmospheric Chemistry). A relatively high horizontal resolution simulation is performed for the years 2005–2008 to evaluate the capability of the model and the emissions to reproduce observed aerosol concentrations and aerosol optical depth (AOD) values. Model output is compared with observations from different measurement networks (CASTNET, EMEP and EANET) and AODs from remote sensing instruments (MODIS and MISR). A good spatial agreement of the distribution of sulfate and ammonium aerosol is found when compared to observations, while calculated nitrate aerosol concentrations show some discrepancies. The simulated temporal development of the inorganic aerosols is in line with measurements of sulfate and nitrate aerosol, while for ammonium aerosol some deviations from observations occur over the USA, due to the wrong temporal distribution of ammonia gas emissions. The calculated AODs agree well with the satellite observations in most regions, while negative biases are found for the equatorial area and in the dust outflow regions (i.e. Central Atlantic and Northern Indian Ocean), due to an underestimation of biomass burning and aeolian dust emissions, respectively. Aerosols and precursors budgets for five different regions (North America, Europe, East Asia, Central Africa and South America) are calculated. Over East-Asia most of the emitted aerosols (precursors) are also deposited within the region, while in North America and Europe transport plays a larger role. Further, it is shown that a simulation with monthly varying anthropogenic emissions typically improves the temporal correlation by 5–10% compared to one with constant annual emissions.
机译:天然气和气溶胶污染物的新全球人为排放库存(Edgar-Circe)已被纳入化学通用循环模型EMAC(ECHAM5 /凌乱大气化学)。对于2005 - 2005年的多年来,执行相对高的水平分辨率模拟,以评估模型的能力和再现观察到的气溶胶浓度和气溶胶光学深度(AOD)值的排放能力。将模型输出与来自不同测量网络(FastNet,EMEP和EAGEET)和来自遥感仪器(MODIS和MISR)的AODS的观测进行比较。与观察结果相比,发现硫酸盐和铵气溶胶分布的良好空间协议,而计算的硝酸盐气溶胶浓度显示出一些差异。由于氨气排放的错误时间分布错误,对于硫酸盐和硝酸盐气溶胶的测量,无机气溶胶的模拟时间呈含有硫酸盐和硝酸盐气溶胶的测量。计算的AODS在大多数地区的卫星观察中吻合良好,而赤道区域和尘埃流出区域(即尘埃流出区域(即北部印度洋)的负偏差是较低估的,因为低估了生物量燃烧和风尘排放,分别。计算五个不同地区的气溶胶和前体预算(北美,欧洲,东亚,中非和南美洲)。在东亚而言,大多数发出的气溶胶(前体)也沉积在该地区内,而在北美和欧洲运输中的作用较大。此外,结果表明,与具有恒定年排放量的一个,随着每月不同的人体发射排放的模拟通常会提高5-10%的时间相关性。

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