On the heterogeneous nucleation of mesospheric ice on meteoric smoke particles: Microphysical modeling
On the heterogeneous nucleation of mesospheric ice on meteoric smoke particles: Microphysical modeling
复制标题
关于流星烟雾颗粒上中层冰的异质成核：微物理模型
DOI：
10.1016/j.jastp.2014.03.009
复制
发表时间：
2014
影响因子：
1.9
通讯作者：
Strelnikov
中科院分区：
文献类型：
--
作者：
Strelnikov
流星烟雾粒子（MSP）被认为是中间层冰的成核细菌，目前被认为是由高吸收性物质组成的，如镁钨<e:1>石、赤铁矿或镁铁硅酸盐，因此可能比周围大气温度高。为了量化MSP与大气之间的温差，我们建立了一个模型来计算MSP在辐射和碰撞平衡中的平衡温度。MSP与周围大气之间的温差很大程度上取决于MSP的组成，特别是相对铁含量，铁含量越高，MSP温度越高。然后，我们推导出中间层冰粒成核速率的表达式，它明确地说明了这种温差。我们发现胚芽温度只要升高几个开尔文，成核速率就会大大降低几个数量级。将这一取决于胚温的成核速率应用到CARMA（共同体大气气溶胶和辐射模式）中，我们发现，与MSP和环境大气之间没有温差的参考情景相比，形成的冰粒更少，但更大。这可能表明富含铁的MSP不是理想的冰核，其他MSP类型或其他成核途径（如波诱导的非均质成核甚至均匀成核）可能是在中悬浮顶形成冰的原因。
Meteor smoke particles (MSP), which are thought to be the nucleation germs for mesospheric ice, are currently discussed to consist of highly absorbing materials such as magnesiowüstite, hematite or magnesium–iron-silicates and may therefore be warmer than the ambient atmosphere. In order to quantify the temperature difference between MSP and the atmosphere we developed a model to calculate the MSP equilibrium temperature in radiational and collisional balance. The temperature difference between MSP and the surrounding atmosphere strongly depends on the composition of the MSP, especially on the relative iron content, where a higher iron content leads to warmer MSP. We then derive an expression of the nucleation rate of mesospheric ice particles which explicitly accounts for this temperature difference. We find that the nucleation rate is strongly reduced by several orders of magnitude if the germ temperature is increased by only a few Kelvin. Implementing this nucleation rate depending on the germ temperature into CARMA, the Community Aerosol and Radiation Model for Atmospheres, we find that fewer but larger ice particles are formed compared to a reference scenario with no temperature difference between MSP and ambient atmosphere. This may indicate that iron-rich MSP are not ideal ice nuclei and that either other MSP-types or other nucleation pathways (e.g. wave induced heterogeneous nucleation or even homogeneous nucleation) are responsible for ice formation at the mesopause.
登录
查看更多内容
亚饱和蒸气中的非 LTE 尘埃成核
DOI：
10.1111/j.1365-2966.2007.12678.x
发表时间：
2007
期刊：
arXiv: Astrophysics
影响因子：
--
作者：
D. Lazzati
通讯作者：
D. Lazzati
影响因子：
--
作者：
R. Keesee
通讯作者：
R. Keesee
夜光云：对其起源、特性和全球影响的模拟研究
影响因子：
2.4
作者：
R. Turco;O. B. Toon;R. Whitten;R. Keesee;D. Hollenbach
通讯作者：
D. Hollenbach
ALWIN 雷达和 SOFIE 对中层冰粒子的观测
DOI：
10.1016/j.jastp.2010.08.002
发表时间：
2011
影响因子：
1.9
作者：
M. Hervig;M. Rapp;R. Latteck;L. Gordley
通讯作者：
L. Gordley
影响因子：
5.2
作者：
M. Gadsden;W. Schröder
通讯作者：
W. Schröder