The temperature dependence of ice-nucleating particle concentrations affects the radiative properties of tropical convective cloud systems
The temperature dependence of ice-nucleating particle concentrations affects the radiative properties of tropical convective cloud systems
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DOI：
10.5194/acp-21-5439-2021
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发表时间：
2021-04-08
影响因子：
6.3
通讯作者：
Murray, Benjamin J.
中科院分区：
文献类型：
--
作者：
Hawker, Rachel E.;Miltenberger, Annette K.;Murray, Benjamin J.
海洋热带地区的对流云系统在全球气候中发挥着至关重要的作用，但准确表示这些云中气溶胶的相互作用仍然是天气和气候建模的主要挑战。我们使用具有先进双矩微物理方案的区域模型来量化冰核粒子（INP）对复杂热带大西洋深对流云场辐射特性的影响。我们的结果表明，域平均日光出射辐射的变化高达 18Wm(2)，具体取决于所选的 INP 参数设置。不同 INP 参数化之间的主要区别是冰形成的温度依赖性，它改变了云微物理过程的垂直分布。即使存在 Hallett-Mossop 二次冰生成，INP 温度依赖性的控制效果也是显着的，并且二次冰形成的效果很大程度上取决于所选的 INP 参数设置。我们的结果对热带云和辐射的气候模型模拟具有影响，该模拟目前不考虑 INP 颗粒类型和冰水含量之间的联系。结果也给 INP 测量界带来了挑战，因为我们证明了在整个混合相温度范围内需要测量 INP 浓度，该温度范围覆盖大约 10 个数量级。
Convective cloud systems in the maritime tropics play a critical role in global climate, but accurately representing aerosol interactions within these clouds persists as a major challenge for weather and climate modelling. We quantify the effect of ice-nucleating particles (INPs) on the radiative properties of a complex tropical Atlantic deep convective cloud field using a regional model with an advanced double-moment microphysics scheme. Our results show that the domain-mean daylight outgoing radiation varies by up to 18Wm(2) depending on the chosen INP parameterisation. The key distinction between different INP parameterisations is the temperature dependence of ice formation, which alters the vertical distribution of cloud microphysical processes. The controlling effect of the INP temperature dependence is substantial even in the presence of Hallett-Mossop secondary ice production, and the effects of secondary ice formation depend strongly on the chosen INP parameterisation. Our results have implications for climate model simulations of tropical clouds and radiation, which currently do not consider a link between INP particle type and ice water content. The results also provide a challenge to the INP measurement community, as we demonstrate that INP concentration measurements are required over the full mixed-phase temperature regime, which covers around 10 orders of magnitude.