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DOI | 10.1175/JAS-D-20-0012.1 |
Do Ultrafine Cloud Condensation Nuclei Invigorate Deep Convection? | |
Grabowski, Wojciech W.; Morrison, Hugh | |
2020-07-01 | |
发表期刊 | Journal of the Atmospheric Sciences
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出版年 | 2020 |
英文摘要 | Numerical simulations of the impact of ultrafine cloud condensation nuclei (CCN) on deep convection are analyzed to investigate the idea proposed by Fan et al. that addition of ultrafine CCN to an otherwise pristine environment leads to convective invigoration. The piggybacking methodology is applied, allowing rigorous separation of the impact of aerosols from different flow realizations that typically occur when even a small element of the model physics or modeling setup is changed. The setup follows the case of daytime convective development over land based on observations during the Large-Scale Biosphere–Atmosphere (LBA) experiment in Amazonia. Overall, the simulated impacts of ultrafine CCN are similar to the previous study by the authors on the impact of pollution on deep convection. There is no convective invigoration above the freezing level, but there is a small invigoration (increase in vertical velocities) below due to the supersaturation and buoyancy differences in conditions with additional ultrafine CCN compared to unperturbed pristine conditions. As in the previous study, the most significant impact is on the upper-tropospheric convective anvils that feature higher cloud fractions in conditions with ultrafine CCN. The increase comes from purely microphysical considerations as the increased cloud droplet concentrations from ultrafine CCN lead to increased ice crystal concentrations and, consequently, smaller sizes and fall velocities, and longer residence times. Mesoscale organization due to low-level shear has a small effect on the simulated ultrafine CCN impacts. Finally, an alternative explanation of increased lightning above oceanic shipping lines seen in satellite observations and argued to result from convective invigoration is provided. |
领域 | 地球科学 ; 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/282717 |
专题 | 地球科学 气候变化 |
推荐引用方式 GB/T 7714 | Grabowski, Wojciech W.,Morrison, Hugh. Do Ultrafine Cloud Condensation Nuclei Invigorate Deep Convection?[J]. Journal of the Atmospheric Sciences,2020. |
APA | Grabowski, Wojciech W.,&Morrison, Hugh.(2020).Do Ultrafine Cloud Condensation Nuclei Invigorate Deep Convection?.Journal of the Atmospheric Sciences. |
MLA | Grabowski, Wojciech W.,et al."Do Ultrafine Cloud Condensation Nuclei Invigorate Deep Convection?".Journal of the Atmospheric Sciences (2020). |
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