A Study of Enhanced Heterogeneous Ice Nucleation in Simulated Deep Convective Clouds Observed During DC3
A Study of Enhanced Heterogeneous Ice Nucleation in Simulated Deep Convective Clouds Observed During DC3
复制标题
DC3期间模拟深对流云中增强的非均质冰核研究
DOI：
10.1029/2018jd028889
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
T. Storelvmo
中科院分区：
文献类型：
--
作者：
A. Takeishi;T. Storelvmo
在WRF - CHEM模式的云解析模拟中，研究了增强非均质冰核（HET）对深对流云（DCCs）性质的影响。该研究的重点是在深对流云和化学（DC3）野外活动中观察到的一个案例。对于具有冷云基温度的模拟dcc， HET产生的冰晶质量与砧冰晶数量浓度之间存在反比关系。这似乎是由于HET和随后的均匀冷冻（HOM）对液滴的间接竞争。此外，我们的模拟表明，在较暖温度下的高温增强能更有效地消耗下方的液滴，因此对铁砧性能的影响比在较冷温度下的高温增强更大。这种温度依赖性表明，冰成核粒子（INP）数量的类似增加可能对dcc产生不同的影响，这取决于INP的类型和在什么温度下它们可以成核冰晶。我们还发现，由于HET的增强，砧冰数浓度的降低可能导致砧云的光学厚度变薄。云光学深度的减少来自冰晶质量浓度的减少，在某些运行中也来自冰晶尺寸的增加。这些结果表明，INPs可能对干旱区的性质产生巨大影响，特别是如果降水主要通过干旱区的冰过程产生。这些结果强调了充分了解气溶胶颗粒形成冰晶的温度依赖性能力的重要性。
The impacts of enhanced heterogeneous ice nucleation (HET) on the properties of deep convective clouds (DCCs) have been investigated in cloud‐resolving simulations with the WRF‐CHEM model. The study focuses on a case observed during the Deep Convective Clouds and Chemistry (DC3) field campaign. For the simulated DCCs, which had cold cloud‐base temperatures, an inverse relationship exists between ice crystal mass produced through HET and anvil ice crystal number concentrations. This seems to be due to the indirect competition between HET and subsequent homogeneous freezing (HOM) for liquid droplets. Furthermore, our simulations suggest that HET enhancements at warmer temperatures are more efficient in depleting liquid droplets below and hence have larger impacts on anvil properties than HET enhancements at colder temperatures do. This temperature dependence indicates that similar increases in the number of ice nucleating particles (INPs) may potentially have different impacts on DCCs, depending on the INP type and at which temperatures they can nucleate ice crystals. We also found that the reduced anvil ice number concentrations due to the enhanced HET may lead to optically thinner anvil clouds. The reduction in cloud optical depth comes from a decrease in ice crystal mass concentrations, and in some runs also from an increase in ice crystal sizes. These results suggest potentially large impacts of INPs on the properties of DCCs, especially if precipitation is predominantly produced through ice processes in the DCCs. The results underscore the importance of fully understanding the temperature‐dependent ability of aerosol particles to nucleate ice crystals.
影响因子：
6.3
作者：
DeMott, P. J.;Prenni, A. J.;Kreidenweis, S. M.
通讯作者：
Kreidenweis, S. M.
DOI：
10.1175/amsmonographs-d-16-0014.1
发表时间：
2017-01-01
期刊：
ICE FORMATION AND EVOLUTION IN CLOUDS AND PRECIPITATION: MEASUREMENT AND MODELING CHALLENGES
影响因子：
--
作者：
Field, P. R.;Lawson, R. P.;Sullivan, S.
通讯作者：
Sullivan, S.
异质冻结过程的新粒子相关参数化：使用空气包裹模型对对流云的敏感性研究
影响因子：
6.3
作者：
S.K. Mitra
通讯作者：
S.K. Mitra