An Arctic CCN-limited cloud-aerosol regime
An Arctic CCN-limited cloud-aerosol regime
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DOI：
10.5194/acp-11-165-2011
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发表时间：
2011-01-01
影响因子：
6.3
通讯作者：
Swietlicki, E.
中科院分区：
文献类型：
--
作者：
Mauritsen, T.;Sedlar, J.;Swietlicki, E.
平均而言，空气中的气溶胶颗粒通过吸收和散射阳光直接冷却地球表面，并通过影响云反射率、寿命、厚度或范围间接冷却地球表面。在这里，我们表明，在北冰洋中部，经常缺乏可能形成云的气溶胶颗粒，气溶胶含量的小幅增加可能会增加云量，从而可能导致冰雪覆盖的北极表面显着变暖。在这些低浓度条件下，即使没有碰撞和聚结，云滴也会成长为毛毛雨大小并落下，从而减少云水。案例研究的证据表明，气溶胶、云和降水之间的相互作用可能是导致观察到的低气溶胶浓度的原因。
On average, airborne aerosol particles cool the Earth's surface directly by absorbing and scattering sunlight and indirectly by influencing cloud reflectivity, life time, thickness or extent. Here we show that over the central Arctic Ocean, where there is frequently a lack of aerosol particles upon which clouds may form, a small increase in aerosol loading may enhance cloudiness thereby likely causing a climatologically significant warming at the ice-covered Arctic surface. Under these low concentration conditions cloud droplets grow to drizzle sizes and fall, even in the absence of collisions and coalescence, thereby diminishing cloud water. Evidence from a case study suggests that interactions between aerosol, clouds and precipitation could be responsible for attaining the observed low aerosol concentrations.