The effect of harmonized emissions on aerosol properties in global models -: an AeroCom experiment
The effect of harmonized emissions on aerosol properties in global models -: an AeroCom experiment
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DOI：
10.5194/acp-7-4489-2007
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发表时间：
2007-01-01
影响因子：
6.3
通讯作者：
Tie, X.
中科院分区：
文献类型：
--
作者：
Textor, C.;Schulz, M.;Tie, X.
本文研究了统一气溶胶源对不同模型模拟的全球气溶胶场的影响。我们比较了两项 AeroCom 实验的结果，一项实验具有不同的结果 (ExpA)，另一项实验具有统一的排放、喷射高度和源头颗粒尺寸 (ExpB)。令人惊讶的是，气溶胶源的协调对全球气溶胶负荷的模拟模型间多样性以及由此产生的全球光学特性影响很小，因为结果很大程度上受模型特定的传输、去除、化学（导致二次气溶胶的形成）和气溶胶微物理参数化（例如，沉积路径之间的分裂）控制，并且在较小程度上受（前体）排放的空间和时间分布控制。黑碳，特别是海盐的负担仅在 ExpB 中变得更加一致，因为这两个物种的巨大 ExpA 多样性是由一些异常值引起的。实验还表明，尽管规定了排放通量和尺寸分布，但各个模型实施中的模糊性可能会导致实质性差异。这些结果表明需要更好地了解过程层面的气溶胶生命周期（包括空间扩散和与气象参数的相互作用），以便从全球气溶胶模拟中获得更可靠的结果。这尤其重要，因为此类模型结果用于评估特定空气污染减排策略的后果。
The effects of unified aerosol sources on global aerosol fields simulated by different models are examined in this paper. We compare results from two AeroCom experiments, one with different (ExpA) and one with unified emissions, injection heights, and particle sizes at the source (ExpB). Surprisingly, harmonization of aerosol sources has only a small impact on the simulated inter-model diversity of the global aerosol burden, and consequently global optical properties, as the results are largely controlled by model-specific transport, removal, chemistry (leading to the formation of secondary aerosols) and parameterizations of aerosol microphysics (e.g., the split between deposition pathways) and to a lesser extent by the spatial and temporal distributions of the (precursor) emissions.The burdens of black carbon and especially sea salt become more coherent in ExpB only, because the large ExpA diversities for these two species were caused by a few outliers. The experiment also showed that despite prescribing emission fluxes and size distributions, ambiguities in the implementation in individual models can lead to substantial differences.These results indicate the need for a better understanding of aerosol life cycles at process level (including spatial dispersal and interaction with meteorological parameters) in order to obtain more reliable results from global aerosol simulations. This is particularly important as such model results are used to assess the consequences of specific air pollution abatement strategies.