Evaluating the impacts of cloud processing on resuspended aerosol particles after cloud evaporation using a particle‐resolved model

2021 ◽  
Author(s):  
Yu Yao ◽  
Matthew L. Dawson ◽  
Donald Dabdub ◽  
Nicole Riemer
Keyword(s):  
Aerosol Particles ◽  
Cloud Processing

scholarly journals Cloud Processing of Aerosol Particles in Marine Stratocumulus Clouds

Atmosphere ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 520 ◽  
Author(s):  
Andrea I. Flossmann ◽  
Wolfram Wobrock
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Numerical Study ◽  
Spatial Scales ◽  
Aerosol Particles ◽  
Cloud Microphysics ◽  
Marine Stratocumulus ◽  
Boundary Layer Clouds ◽  
Cloud Processing ◽  
Stratocumulus Clouds

Cloud processing of aerosol particles is an important process and is, for example, thought to be responsible for the so-called “Hoppel-minimum” in the marine aerosol particle distribution or contribute to the cell organization of marine boundary layer clouds. A numerical study of the temporal and spatial scales of the processing of aerosol particles by typical marine stratocumulus clouds is presented. The dynamical framework is inspired by observations during the VOCALS (Variability of the American Monsoon System Ocean-Cloud-Atmosphere-Land Study) Regional Experiment in the Southeast Pacific. The 3-D mesoscale model version of DESCAM (Detailed Scavenging Model) follows cloud microphysics of the stratocumulus deck in a bin-resolved manner and has been extended to keep track of cloud-processed particles in addition to non-processed aerosol particles in the air and inside the cloud drops. The simulation follows the evolution of the processing of aerosol particles by the cloud. It is found that within one hour almost all boundary layer aerosol particles have passed through at least one cloud cycle. However, as the in-cloud residence times of the particles in the considered case are only on the order of minutes, the aerosol particles remain essentially unchanged. Our findings suggest that in order to produce noticeable microphysical and dynamical effects in the marine boundary layer clouds, cloud processing needs to continue for extended periods of time, exceeding largely the time period considered in the present study. A second model study is dedicated to the interaction of ship track particles with marine boundary layer clouds. The model simulates quite satisfactorily the incorporation of the ship plume particles into the cloud. The observed time and spatial scales and a possible Twomey effect were reproduced.

scholarly journals MADE-IN: a new aerosol microphysics submodel for global simulation of potential atmospheric ice nuclei

2010 ◽  
Vol 3 (4) ◽  
pp. 2221-2290 ◽  
Author(s):  
V. Aquila ◽  
J. Hendricks ◽  
A. Lauer ◽  
N. Riemer ◽  
H. Vogel ◽  
...  
Keyword(s):  
Atmospheric Chemistry ◽  
Aerosol Particles ◽  
Ice Crystals ◽  
Dust Particles ◽  
Airborne Measurements ◽  
Cloud Processing ◽  
Ice Nuclei ◽  
Hygroscopic Properties ◽  
Mixing States ◽  
Made In

Abstract. Black carbon (BC) and mineral dust are among the dominant atmospheric ice nuclei, i.e. aerosol particles that can initiate heterogeneous nucleation of ice crystals. When released, most BC and dust particles are externally mixed with other aerosol compounds. Through coagulation with particles containing soluble material and condensation of gases, externally mixed particles may obtain a coating and be transferred into an internal mixture. The mixing state of BC and dust aerosol particles influences their radiative and hygroscopic properties, as well as their ability of building ice crystals. We introduce the new aerosol microphysics submodel MADE-IN, implemented within the ECHAM/MESSy Atmospheric Chemistry global model (EMAC). MADE-IN is able to track separately mass and number concentrations of BC and dust particles in their different mixing states, as well as particles free of BC and dust. MADE-IN describes these three classes of particles through a superposition of seven log-normally distributed modes, and predicts the evolution of their size distribution and chemical composition. Six out of the seven modes are mutually interacting, allowing for the transfer of mass and number among them. Separate modes for the different mixing states of BC and dust particles in EMAC/MADE-IN allow for explicit simulations of the relevant aging processes, i.e. condensation, coagulation and cloud processing. EMAC/MADE-IN has been evaluated with surface and airborne measurements and performs well both in the planetary boundary layer and in the upper troposphere and lowermost stratosphere. Such a model represents a highly appropriate tool for the study of the concentration and composition of potential atmospheric ice nuclei.

scholarly journals Aerosol properties, source identification, and cloud processing in orographic clouds measured by single particle mass spectrometry on a Central European mountain site during HCCT-2010

2015 ◽  
Vol 15 (17) ◽  
pp. 24419-24472 ◽  
Author(s):  
A. Roth ◽  
J. Schneider ◽  
T. Klimach ◽  
S. Mertes ◽  
D. van Pinxteren ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Single Particle ◽  
Mass Spectra ◽  
Cloud Condensation Nuclei ◽  
Aerosol Particles ◽  
Algorithm Analysis ◽  
Sorting Algorithm ◽  
Condensation Nuclei ◽  
Cloud Processing ◽  
Orographic Clouds

Abstract. Cloud residues and out-of-cloud aerosol particles with diameters between 150 and 900 nm have been analysed by on-line single particle aerosol mass spectrometry during the six-week study HCCT-2010 in September/October 2010. The measurement location was the mountain Schmücke (937 m a.s.l.) in Central Germany. More than 170 000 bipolar mass spectra from out-of-cloud aerosol particles and more than 14 000 bipolar mass spectra from cloud residual particles were obtained and were classified using a fuzzy c-means clustering algorithm. Analysis of the uncertainty of the sorting algorithm was conducted on a subset of the data by comparing the clustering output with particle-by-particle inspection and classification by the operator. This analysis yielded a false classification probability between 13 and 48 %. Additionally, particle types were identified by specific marker ions. The results from the ambient aerosol analysis show that 63 % of the analysed particles belong to clusters indicating a diurnal variation, suggesting that local or regional sources dominate the aerosol, especially for particles containing soot and biomass burning particles. In the cloud residues the relative percentage of large soot-containing particles and particles containing amines was found to be increased compared to the out-of-cloud aerosol, while in general organic particles were less abundant in the cloud residues. In the case of amines this can be explained by the high solubility of the amines, while the large soot-containing particles were found to be internally mixed with inorganics, which explains their activation as cloud condensation nuclei. Furthermore, the results show that during cloud processing, both sulphate and nitrate are added to the residual particles, thereby changing the mixing state and increasing the fraction of particles with nitrate and/or sulphate. This is expected to lead to higher hygroscopicity after cloud evaporation, and therefore to an increase of the particles' ability to act as cloud condensation nuclei after their cloud passage.

scholarly journals Cloud processing of continental aerosol particles: Experimental investigations for different drop sizes

2000 ◽  
Vol 105 (D9) ◽  
pp. 11739-11752 ◽  
Author(s):  
Martina Krämer ◽  
Norbert Beltz ◽  
Dieter Schell ◽  
Lothar Schütz ◽  
Cornelia Sprengard-Eichel ◽  
...  
Keyword(s):  
Aerosol Particles ◽  
Experimental Investigations ◽  
Cloud Processing

scholarly journals Influence of cloud processing on CCN activation behaviour in the Thuringian Forest, Germany during HCCT-2010

2014 ◽  
Vol 14 (15) ◽  
pp. 7859-7868 ◽  
Author(s):  
S. Henning ◽  
K. Dieckmann ◽  
K. Ignatius ◽  
M. Schäfer ◽  
P. Zedler ◽  
...  
Keyword(s):  
Cloud Condensation Nuclei ◽  
Aerosol Particles ◽  
Isotopic Analysis ◽  
Mass Spectrometry Analysis ◽  
Mountain Ridge ◽  
Spectrometry Analysis ◽  
Cloud Processing ◽  
Total Particle ◽  
Particle Spectra ◽  
The Hill

Abstract. Within the framework of the "Hill Cap Cloud Thuringia 2010" (HCCT-2010) international cloud experiment, the influence of cloud processing on the activation properties of ambient aerosol particles was investigated. Particles were probed upwind and downwind of an orographic cap cloud on Mt Schmücke, which is part of a large mountain ridge in Thuringia, Germany. The activation properties of the particles were investigated by means of size-segregated cloud condensation nuclei (CCN) measurements at 3 to 4 different supersaturations. The observed CCN spectra together with the total particle spectra were used to calculate the hygroscopicity parameter κ for the upwind and downwind stations. The upwind and downwind critical diameters and κ values were then compared for defined cloud events (FCE) and non-cloud events (NCE). Cloud processing was found to increase the hygroscopicity of the aerosol particles significantly, with an average increase in κ of 50%. Mass spectrometry analysis and isotopic analysis of the particles suggest that the observed increase in the hygroscopicity of the cloud-processed particles is due to an enrichment of sulfate and possibly also nitrate in the particle phase.

scholarly journals The influence of nitric acid on the cloud processing of aerosol particles

2006 ◽  
Vol 6 (6) ◽  
pp. 1627-1634 ◽  
Author(s):  
S. Romakkaniemi ◽  
H. Kokkola ◽  
K. E. J. Lehtinen ◽  
A. Laaksonen
Keyword(s):  
Sulfuric Acid ◽  
Nitric Acid ◽  
Aerosol Particles ◽  
Cloud Droplet ◽  
Number Concentration ◽  
Radiative Properties ◽  
Aerosol Size Distribution ◽  
Cloud Droplets ◽  
Cloud Processing ◽  
Cloud Droplet Number Concentration

Abstract. In this paper we present simulations of the effect of nitric acid (HNO3) on cloud processing of aerosol particles. Sulfuric acid (H2SO4) production and incloud coagulation are both affected by condensed nitric acid as nitric acid increases the number of cloud droplets, which will lead to smaller mean size and higher total surface area of droplets. As a result of increased cloud droplet number concentration (CDNC), the incloud coagulation rate is enhanced by a factor of 1–1.3, so that the number of interstitial particles reduces faster. In addition, sulfuric acid production occurs in smaller particles and so the cloud processed aerosol size distribution is dependent on the HNO3 concentration. This affects both radiative properties of aerosol particles and the formation of cloud droplets during a sequence of cloud formation-evaporation events. It is shown that although the condensation of HNO3 increases the number of cloud droplets during the single updraft, it is possible that presence of HNO3 can actually decrease the cloud droplet number concentration after several cloud cycles when also H2SO4 production is taken into account.

scholarly journals Influence of cloud processing on CCN activation behaviour in the Thuringian Forest, Germany during HCCT-2010

2014 ◽  
Vol 14 (2) ◽  
pp. 1617-1645 ◽  
Author(s):  
S. Henning ◽  
K. Dieckmann ◽  
K. Ignatius ◽  
M. Schäfer ◽  
P. Zedler ◽  
...  
Keyword(s):  
Cloud Condensation Nuclei ◽  
Aerosol Particles ◽  
Isotopic Analysis ◽  
Mass Spectrometry Analysis ◽  
Particle Phase ◽  
Mountain Ridge ◽  
Spectrometry Analysis ◽  
Cloud Processing ◽  
Total Particle ◽  
Particle Spectra

Abstract. Within the framework of the international cloud experiment "Hill Cap Cloud Thuringia 2010" (HCCT-2010), the influence of cloud processing on the activation properties of ambient aerosol particles was investigated. Particles were probed up- and downwind of an orographic cap cloud on Mt. Schmücke, which is part of a large mountain ridge in Thuringia, Germany. The activation properties of the particles were investigated by means of size-segregated Cloud Condensation Nuclei (CCN) measurements at 3 to 4 different supersaturations. The observed CCN spectra together with the total particle spectra were used to calculate the hygroscopicity parameter κ for the up- and the downwind stations. The up- and downwind critical diameters and κ values were then compared for defined Cloud Events and Non Cloud Events. Cloud processing was found to significantly increase the hygroscopicity of the aerosol particles, with an average increase in κ of 50%. Mass spectrometry analysis and isotopic analysis of the particles show that the observed increase in hygroscopicity of the cloud-processed particles is due to an enrichment of nitrate and sulfate in the particle phase.

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