The role of CCN in precipitation and hail in a mid-latitude storm as seen in simulations using a spectral (bin) microphysics model in a 2D dynamic frame

Хаин, А.; Rosenfeld, Daniel; Pokrovsky, A.; Blahak, Ulrich; Ryzhkov, Alexander V.

doi:10.1016/j.atmosres.2010.09.015

Cited by 123 publications

(117 citation statements)

References 57 publications

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“…Nevertheless, hail precipitation at the surface in the case of high CCN concentration is higher than in the case of low CCN concentration by an order of magnitude, in agreement with results by Khain et al (2011) and Ilotoviz et al (2016). This effect can be attributed by formation of larger hail particles in the case of high CCN concentration (high supercooled mass content).…”

Section: Discussionsupporting

confidence: 79%

“…Accumulated rain is maximum in EN3500-S-0.5, where the effect of the smallest CCN is combined with the effect of a comparatively large amount of large CCN. This synergetic effect of the smallest and large CCN is described by Khain et al (2011). In most simulations, the masses of accumulated rain are quite similar.…”

Section: Low Ccn Concentrationmentioning

confidence: 80%

“…These values correspond to the data according to which the nuclei mode (the smallest CCN) in marine aerosol size distribution contains aerosols smaller than the nuclei mode in continental cases or even than in urban cases (Ghan et al, 2011). Similar CCN size distributions were used by Khain et al (2011). These simulations are referred to as E3500 and E100 (ST) and EN3500 and EN100 (NA), respectively.…”

Section: Symbol Description Unitsmentioning

confidence: 99%

“…List of symbols. Khain et al (2011). The background wind direction was quasi-2-D, which simplified the prescription of the background wind profile in the 2-D model.…”

Section: Design Of Simulationsmentioning

confidence: 99%

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Application of a new scheme of cloud base droplet nucleation in a spectral (bin) microphysics cloud model: sensitivity to aerosol size distribution

Ilotoviz

Хаин

2016

Atmos. Chem. Phys.

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Abstract. A new scheme of droplet nucleation at cloud base is implemented into the Hebrew University Cloud Model (HUCM) with spectral (bin) microphysics. In this scheme, supersaturation maximum S max near cloud base is calculated using theoretical results according to which, where w is the vertical velocity at cloud base and N d is droplet concentration. Microphysical cloud structure obtained in the simulations of a midlatitude hail storm using the new scheme is compared with that obtained in the standard approach, in which droplet nucleation is calculated using supersaturation calculated in grid points. The simulations were performed with different concentrations of cloud condensational nuclei (CCN) and with different shapes of CCN size spectra. It is shown that the new nucleation scheme substantially improves the vertical profile of droplet concentration shifting the concentration maximum to cloud base. It is shown that the effect of the CCN size distribution shape on cloud microphysics is not less important than the effect of the total CCN concentration. It is shown that the smallest CCN with diameters less than about 0.015 µm have a substantial effect on mixed-phase and ice microphysics of deep convective clouds. Such CCN are not measured by standard CCN probes, which hinders understanding of cold microphysical processes.

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Section: Discussionsupporting

confidence: 79%

Section: Low Ccn Concentrationmentioning

confidence: 80%

Section: Symbol Description Unitsmentioning

confidence: 99%

“…List of symbols. Khain et al (2011). The background wind direction was quasi-2-D, which simplified the prescription of the background wind profile in the 2-D model.…”

Section: Design Of Simulationsmentioning

confidence: 99%

See 2 more Smart Citations

Application of a new scheme of cloud base droplet nucleation in a spectral (bin) microphysics cloud model: sensitivity to aerosol size distribution

Ilotoviz

Хаин

2016

Atmos. Chem. Phys.

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“…Also, as convection is not identical in character around the world, meteorological impacts on convection may change how it responds to the presence of increased aerosols. For instance, several studies [e.g., Khain et al, 2010;Storer et al, 2010] have shown that strongly forced midlatitude convection may be less likely to undergo convective invigoration. This study may not be representative of aerosol impacts on convection in other regions of the world or of the impacts of other aerosol types.…”

Section: 1002/2013jd020272mentioning

confidence: 99%

Observations of aerosol‐induced convective invigoration in the tropical east Atlantic

2014

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Four years of CloudSat data have been analyzed over a region of the east Atlantic Ocean in order to examine the influence of aerosols on deep convection. The satellite data were combined with information about aerosols taken from the Global and Regional Earth-System Monitoring Using Satellite and In Situ Data model. Only those profiles fitting the definition of deep convective clouds were analyzed. Overall, the cloud center of gravity, cloud top, and rain top were all found to increase with increased aerosol loading. These effects were largely independent of the environment, and the differences between the cleanest and most polluted clouds sampled were found to be statistically significant. When examining an even smaller subset of deep convective clouds likely to be part of the convective core, similar trends were seen. These observations suggest that convective invigoration occurs with increased aerosol loading, leading to deeper, stronger storms in polluted environments.

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The effects of turbulence on the microphysics of mixed‐phase deep convective clouds investigated with a 2‐D cloud model with spectral bin microphysics

Benmoshe

Хаин

2014

JGR Atmospheres

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[1] Multiple recent studies investigate the effects of turbulence on collisions of cloud droplets. It was shown that turbulence typical of cumulus clouds increases the collision rate between cloud droplets several times. The turbulent-induced collision enhancement decreases the time and the height of raindrops formation. In the present study, the potential effect of turbulence on the microstructure of mixed-phase deep convective clouds is investigated. Effects of turbulence-induced enhancement of the collision rate between ice particles as well as between ice particles and water drops are investigated by means of the Hebrew University Cloud model with spectral bin microphysics. Simulations of isolated deep convective mixed-phase clouds were performed under different aerosol conditions. It is shown that turbulence may have a substantial impact on the microphysical structure of mixed-phase convective clouds. At the same time, turbulence impact on accumulated rain amount from a single cloud is not very significant.

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The role of CCN in precipitation and hail in a mid-latitude storm as seen in simulations using a spectral (bin) microphysics model in a 2D dynamic frame

Cited by 123 publications

References 57 publications

Application of a new scheme of cloud base droplet nucleation in a spectral (bin) microphysics cloud model: sensitivity to aerosol size distribution

Application of a new scheme of cloud base droplet nucleation in a spectral (bin) microphysics cloud model: sensitivity to aerosol size distribution

Observations of aerosol‐induced convective invigoration in the tropical east Atlantic

The effects of turbulence on the microphysics of mixed‐phase deep convective clouds investigated with a 2‐D cloud model with spectral bin microphysics

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