Description and evaluation of GLOMAP-mode: a modal global aerosol microphysics model for the UKCA composition-climate model

Mann, G. W.; Carslaw, K. S.; Spracklen, D. V.; Ridley, D. A.; Manktelow, P. T.; Chipperfield, Martyn P.; Pickering, Steven; Johnson, C. E.

doi:10.5194/gmd-3-519-2010

Cited by 486 publications

(628 citation statements)

References 86 publications

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“…Insoluble modes are assumed to be non-hygroscopic and not wet deposited via nucleation scavenging. Aerosol moves from insoluble to soluble modes through coagulation or after the condensation of ten monolayers of gas phase species (sulphuric acid and oxidised organics) 37 . Rate of ageing through condensation therefore depends on the aerosol size distribution as well as oxidant and precursor gas concentrations.…”

Section: Figure Captionsmentioning

confidence: 99%

“…To assess its implications, we use the global model of Mann et al, (2010) 20 that represents aerosol using a modal scheme. Fresh BC is considered 'insoluble' until particles have undergone sufficient atmospheric processing.…”

Section: Global Model Applicationmentioning

confidence: 99%

“…The global distribution of atmospheric aerosol was simulated using the 3D Global Model of Aerosol Processes (GLOMAP) 37 , which is an extension to the TOMCAT chemical transport model, driven by analysed ECMWF meteorology. A horizontal resolution of 2.8°×2.8° and 31 vertical levels between the surface and 10 hPa for the year 2008 is used.…”

Section: Figure Captionsmentioning

confidence: 99%

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Black-carbon absorption enhancement in the atmosphere determined by particle mixing state

et al. 2017

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Atmospheric black carbon makes an important but poorly quantified contribution to the warming of the global atmosphere. Laboratory and modelling studies have shown that the addition of non-black carbon materials to black carbon particles may enhance the particles' light absorption by 50 to 60% by refracting and reflecting light. Real world experimental evidence for this 'lensing' effect is scant and conflicting, showing that absorption enhancements can be less than 5% or as large as 140%. Here we present simultaneous quantifications of the composition and optical properties of individual atmospheric black carbon particles. We show that particles with a mass ratio of non-black carbon to black carbon of less than 1.5, which is typical of fresh traffic sources, are best represented as having no absorption enhancement. In contrast, black carbon particles with a ratio greater than 3, which is typical of biomass burning emissions, are best described assuming optical lensing leading to an absorption enhancement. We introduce a generalised hybrid model approach for estimating scattering and absorption enhancements based on laboratory and atmospheric observations. We conclude that the occurrence of the absorption enhancement of black carbon particles is determined by the particles' mass ratio of non-black carbon to black carbon.Atmospheric black carbon (BC) makes the second largest single contribution after CO 2 to climate forcing in the present-day atmosphere 1 . Previous detailed modelling and laboratory studies have shown that weakly absorbing non-BC materials contained within the same particles as BC can significantly enhance the absorption per unit mass of the latter through refraction and internal reflections, sometimes referred to as the 'lensing effect' 2,3 . A "coreshell" description 4 has often been applied to describe this effect when coatings envelop the central BC core, but this oversimplifies the complex particle morphologies 5 . The non-BC components may not be evenly distributed and the BC core is not necessarily completely enclosed, and as such the absorption enhancement predicted using the core-shell approach could greatly overestimate the real value 3 . Microscopy 5,6 can examine BC microphysical properties but has limited quantitative capability and may evaporate semi-volatile materials.By detecting the remaining non-BC fragment after laser induced incandescence with a single particle soot photometer (SP2 7 , DMT inc.), Sedlacek et al. 8 and Moteki et al. 9 reported the non-core-shell structure of some BC particles, however they did not provide an appropriate model approach to estimate optical properties. Measurement of single BC particle mass ratioIn this study, for the first time we quantify the mixing state of individual BC particles using morphology-independent measurements of the total particle mass (M p ) and the mass of the refractory black carbon, rBC (M rBC ) from a variety of laboratory and field experiments. We determined the mass ratio, M R (= M non-BC /M rBC ), where M non-BC is the mas...

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Section: Figure Captionsmentioning

confidence: 99%

Section: Global Model Applicationmentioning

confidence: 99%

Section: Figure Captionsmentioning

confidence: 99%

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Black-carbon absorption enhancement in the atmosphere determined by particle mixing state

et al. 2017

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“…The CTM is coupled with the GLObal Model of Aerosol Processes (GLOMAP, [10]), which is a comprehensive, size-resolving global aerosol model. In this work CTM-GLOMAP employs 7 modes and 5 components.…”

Section: Methodology (A) the Modelsmentioning

confidence: 99%

Simulation of Cloud-aerosol Lidar with Orthogonal Polarization (CALIOP) Attenuated Backscatter Profiles Using the Global Model of Aerosol Processes (GLOMAP)

Young

Cope

Lee

et al. 2016

EPJ Web of Conferences

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To permit the calculation of the radiative effects of atmospheric aerosols, we have linked our aerosol-chemical transport model (CTM-GLOMAP) to a new radiation module (UKCA-RADAER). In order to help assess and improve the accuracy of the radiation code, in particular the height dependence of the predicted scattering, we have developed a module that simulates attenuated backscatter (ABS) profiles that would be measured by the satellite-borne Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) if it were to sample an atmosphere with the same aerosol loading as predicted by the CTM. Initial results of our comparisons of the predicted ABS profiles with actual CALIOP data are encouraging but some differences are noted, particularly in marine boundary layers where the scattering is currently under-predicted and in dust layers where it is often over-predicted. The sources of these differences are being investigated.

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“…This method is not too expensive computationally, and is at the same time rather accurate (Whitby and McMurry, 1997). A 'pseudomodal' approach has been 10 used to develop fast and efficient aerosol microphysics modules for large-scale atmospheric modelling purposes (Vignati et al, 2004;Stier et al, 2005;Mann et al, 2010;Pringle et al, 2010;Aquila et al, 2011;Zhang et al, 2012;Liu et al, 2016).…”

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confidence: 99%

A simple model for the time evolution of the condensation sink in the atmosphere for intermediate Knudsen numbers

Ezhova¹,

Kerminen²,

Lehtinen³

et al. 2017

Preprint

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Abstract. Transformation of the mass flux towards the particle from the kinetic regime to the continuum regime is often described by the Fuchs-Sutugin coefficient. Kinetic regime can be obtained as a limiting case when only one term of the expansion of the Fuchs-Sutugin coefficient at small 1/Kn is considered. Here we take into account the two first terms, and get the mass flux which agrees well with the full mass flux up to Kn ∼ 0.5. This procedure allows to obtain an analytical solution of the condensation equation valid for the range of intermediate Knudsen numbers. The expansion is further applied 5 to calculate analytically the condensation sink. The formula for the condensation sink is tested against field observations. The relative contribution of different aerosol modes to the condensation sink is discussed. Furthermore, we present a simple model describing a coupled dynamics of the condensing vapour and the condensation sink. The model gives reasonable predictions of the condensation sink dynamics during the periods of the aerosol modes growth by condensation in the atmosphere.

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Description and evaluation of GLOMAP-mode: a modal global aerosol microphysics model for the UKCA composition-climate model

Cited by 486 publications

References 86 publications

Black-carbon absorption enhancement in the atmosphere determined by particle mixing state

Black-carbon absorption enhancement in the atmosphere determined by particle mixing state

Simulation of Cloud-aerosol Lidar with Orthogonal Polarization (CALIOP) Attenuated Backscatter Profiles Using the Global Model of Aerosol Processes (GLOMAP)

A simple model for the time evolution of the condensation sink in the atmosphere for intermediate Knudsen numbers

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