Direct radiative effect of dust-pollution interactions
Direct radiative effect of dust-pollution interactions
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DOI：
10.5194/acp-2018-1104
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
K. Klingmüller;J. Lelieveld;V. Karydis;G. Stenchikov
中科院分区：
文献类型：
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作者：
K. Klingmüller;J. Lelieveld;V. Karydis;G. Stenchikov
抽象的。风尘的化学老化，通过与空气污染的相互作用，影响矿物颗粒的光学和吸湿性，从而影响其在大气中的停留时间和气候强迫。相反，灰尘颗粒的化学成分及其作为凝结伙伴的作用会影响颗粒空气污染的丰度。这导致了与矿物尘相关的人为辐射强迫，尽管大多数风成尘都是自然形成的。使用大气化学气候模式EMAC的老化过程的详细参数化和排放计划占沙漠土壤的化学成分，我们研究了全球和区域的直接辐射强迫。我们的研究结果表明，大的积极和消极的强迫，这取决于该地区。从西非到东亚，沙尘带大部分地区的大气顶部主要是负强迫，在萨赫勒以南达到最大值约为−2 W/m2，与印度上空的正强迫形成对比。在全球平均情况下，这些强迫部分抵消，导致净负强迫为-0.05 W/m2，但这仍然占总沙尘强迫的相当大一部分。
Abstract. The chemical ageing of aeolian dust, through interactions with air pollution, affects the optical and hygroscopic properties of the mineral particles and hence their atmospheric residence time and climate forcing. Conversely, the chemical composition of the dust particles and their role as coagulation partners impact the abundance of particulate air pollution. This results in an anthropogenic radiative forcing associated with mineral dust notwithstanding the natural origin of most aeolian dust. Using the atmospheric chemistry climate model EMAC with a detailed parametrisation of ageing processes and an emission scheme accounting for the chemical composition of desert soils, we study the direct radiative forcing globally and regionally. Our results indicate large positive and negative forcings, depending on the region. The predominantly negative forcing at the top of the atmosphere over large parts of the dust belt, from West Africa to East Asia, attains a maximum of about −2 W/m2 south of the Sahel, in contrast to a positive forcing over India. Globally averaged, these forcings partially counterbalance, resulting in a net negative forcing of −0.05 W/m2, which nevertheless represents a considerable fraction of the total dust forcing.