A global modeling study on carbonaceous aerosol microphysical characteristics and radiative effects
A global modeling study on carbonaceous aerosol microphysical characteristics and radiative effects
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DOI：
10.5194/acp-10-7439-2010
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发表时间：
2010-01-01
影响因子：
6.3
通讯作者：
Tsigaridis, K.
中科院分区：
文献类型：
--
作者：
Bauer, S. E.;Menon, S.;Tsigaridis, K.
最近，人们开始关注黑碳气溶胶作为短期气候变暖减缓候选物。然而，由于气溶胶演变的复杂性质以及混合的老化气溶胶与云和辐射相互作用的方式，气溶胶的直接、间接和半直接效应对全球和区域的影响非常不确定。一个详细的气溶胶微物理方案，MATRIX，嵌入在GISS气候模式中，在这项研究中提出了一个定量评估的影响微物理过程涉及黑碳，如气溶胶云激活和辐射效应的发射尺寸分布和光学特性。我们对1750 - 2000年气溶胶直接和间接辐射通量净变化的最佳估计是-0.56 W/m（2）。然而，直接和间接气溶胶的影响是相当敏感的黑色和有机碳的粒径分布和相应的混合状态。净辐射通量变化可以在-0.32至-0.75 W/m（2）之间变化，这取决于这些碳质颗粒在发射时的性质。考虑到内部混合的黑碳颗粒，我们可以模拟正确的气溶胶吸收。黑碳气溶胶的吸收被硫酸盐和硝酸盐涂层放大，甚至更强烈地被有机涂层放大。黑碳减排情景一般表明，当减少柴油等黑碳比例较大的来源时，辐射通量会减少;然而，减少生物燃料等有机碳成分较大的来源并不一定会导致正辐射通量的减少。
Recently, attention has been drawn towards black carbon aerosols as a short-term climate warming mitigation candidate. However the global and regional impacts of the direct, indirect and semi-direct aerosol effects are highly uncertain, due to the complex nature of aerosol evolution and the way that mixed, aged aerosols interact with clouds and radiation. A detailed aerosol microphysical scheme, MATRIX, embedded within the GISS climate model is used in this study to present a quantitative assessment of the impact of microphysical processes involving black carbon, such as emission size distributions and optical properties on aerosol cloud activation and radiative effects.Our best estimate for net direct and indirect aerosol radiative flux change between 1750 and 2000 is -0.56 W/m(2). However, the direct and indirect aerosol effects are quite sensitive to the black and organic carbon size distribution and consequential mixing state. The net radiative flux change can vary between -0.32 to -0.75 W/m(2) depending on these carbonaceous particle properties at emission. Taking into account internally mixed black carbon particles let us simulate correct aerosol absorption. Absorption of black carbon aerosols is amplified by sulfate and nitrate coatings and, even more strongly, by organic coatings. Black carbon mitigation scenarios generally showed reduced radiative fluxeswhen sources with a large proportion of black carbon, such as diesel, are reduced; however reducing sources with a larger organic carbon component as well, such as bio-fuels, does not necessarily lead to a reduction in positive radiative flux.