Computationally efficient expressions for the collision efficiency between electrically charged aerosol particles and cloud droplets

Tripathi, Sachchida Nand; Vishnoi, S.; Kumar, Sanjeev; Harrison, Richard G.

doi:10.1256/qj.05.125

Cited by 24 publications

(16 citation statements)

References 11 publications

(4 reference statements)

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“…The parameterizations of Tripathi et al (2006) were for droplet sizes which were considerably larger than those typical for in-cloud scavenging, and did not include particle diffusion. The first parameterizations of simulations with diffusion are due to Tinsley and Leddon (2013), and now more accurate and user-friendly parameterizations are available (Tinsley and Zhou, 2015).…”

Section: Simulations Of Electro-scavenging and Electro-anti-scavenginmentioning

confidence: 99%

Solar wind-atmospheric electricity-cloud microphysics connections to weather and climate

Lam

Tinsley

2016

Journal of Atmospheric and Solar-Terrestrial Physics

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ABSTRACT: We review recent research articles that present observations of the large-scale day-to-day dynamic tropospheric response to changes in the downward current density J z of the global atmospheric electric circuit (GEC). The evidence for the global circuit downward current density, J z , causing changes in atmospheric dynamics is now even stronger than as reviewed by Tinsley (Reports on Progress in Physics volume 71, 2008). We consider proposed mechanisms for these responses, and suggest future directions for research.

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Section: Simulations Of Electro-scavenging and Electro-anti-scavenginmentioning

confidence: 99%

Solar wind-atmospheric electricity-cloud microphysics connections to weather and climate

Lam

Tinsley

2016

Journal of Atmospheric and Solar-Terrestrial Physics

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“…This was called electrofreezing. A possible mechanism for electrofreezing is the electricallyenhanced collection of charged ice nuclei by supercooled water droplets, which has been quantified through detailed modelling (Harrison 2000;Tripathi 2000;Tinsley et al 2001;Tripathi and Harrison 2002;Tripathi et al 2006). Such an electrically-enhanced aerosol scavenging process, known as electroscavenging, may lead to electrofreezing on the cloud boundary.…”

Section: Properties Of the Global Electric Circuitmentioning

confidence: 99%

Investigating Earth’s Atmospheric Electricity: a Role Model for Planetary Studies

2008

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The historical development of terrestrial atmospheric electricity is described, from its beginnings with the first observations of the potential gradient to the global electric circuit model proposed by C.T.R. Wilson in the early 20th century. The properties of the terrestrial global circuit are summarised. Concepts originally needed to develop the idea of a global circuit are identified as "central tenets", for example, the importance of radio science in establishing the conducting upper layer. The central tenets are distinguished from additional findings that merely corroborate, or are explained by, the global circuit model. Using this analysis it is possible to specify which observations are preferable for detecting global circuits in extraterrestrial atmospheres. Schumann resonances, the extremely low frequency signals generated by excitation of the surface-ionosphere cavity by electrical discharges, are identified as the most useful single measurement of electrical activity in a planetary atmosphere.

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“…Rainfall through a volcanic plume may therefore be expected to preferentially remove the charged particles over neutral particles, but this has yet to be tested. Tripathi et al (2006) provide a simple method for calculations of the enhanced collection efficiency of charged particles by water drops.…”

Section: Washout Of Electrified Particlesmentioning

confidence: 99%

Electrification of volcanic plumes

2006

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Volcanic lightning, perhaps the most spectacular consequence of the electrification of volcanic plumes, has been implicated in the origin of life on Earth, and may also exist in other planetary atmospheres. Recent years have seen volcanic lightning detection used as part of a portfolio of developing techniques to monitor volcanic eruptions. Remote sensing measurement techniques have been used to monitor volcanic lightning, but surface observations of the atmospheric electric Potential Gradient (PG) and the charge carried on volcanic ash also show that many volcanic plumes, whilst not sufficiently electrified to produce lightning, have detectable electrification exceeding that of their surrounding environment. Electrification has only been observed associated with ash-rich explosive plumes, but there is little evidence that the composition of the ash is critical to its occurrence. Different conceptual theories for charge generation and separation in volcanic plumes have been developed to explain the disparate observations obtained, but the ash fragmentation mechanism appears to be a key parameter. It is unclear which mechanisms or combinations of electrification mechanisms dominate in different circumstances. Electrostatic forces play an important role in modulating the dry fallout of ash from a volcanic plume. Beyond the local electrification of plumes, the higher stratospheric particle concentrations following a large explosive eruption may affect the global atmospheric electrical circuit. It is possible that this might present another, if minor, way by which large volcanic eruptions affect global climate. The direct hazard of volcanic lightning to communities is generally low compared to other aspects of volcanic activity.

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Computationally efficient expressions for the collision efficiency between electrically charged aerosol particles and cloud droplets

Cited by 24 publications

References 11 publications

Solar wind-atmospheric electricity-cloud microphysics connections to weather and climate

Solar wind-atmospheric electricity-cloud microphysics connections to weather and climate

Investigating Earth’s Atmospheric Electricity: a Role Model for Planetary Studies

Electrification of volcanic plumes

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