The transformation of solid atmospheric particles into liquid droplets through heterogeneous chemistry: Laboratory insights into the processing of calcium containing mineral dust aerosol in the troposphere
Reads0
Chats0
TLDR
In this paper, the phase transformation of solid particles into liquid droplets through heterogeneous chemistry was shown in a two-step mechanism involving the conversion of calcium carbonate into calcium nitrate followed by the deliquescence of the calcium Nitrate product.Abstract:
[1] Individual calcium carbonate particles reacted with gas-phase nitric acid at 293 K have been followed using Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX) analysis as a function of time and relative humidity (RH). The rate of calcium carbonate to calcium nitrate conversion is significantly enhanced in the presence of water vapor. The SEM images clearly show that solid CaCO 3 particles are converted to spherical droplets as the reaction proceeds. The process occurs through a two-step mechanism involving the conversion of calcium carbonate into calcium nitrate followed by the deliquescence of the calcium nitrate product. The change in phase of the particles and the significant reactivity of nitric acid and CaCO 3 at low RH are a direct result of the deliquescence of the product at low RH. This is the first laboratory study to show the phase transformation of solid particles into liquid droplets through heterogeneous chemistry.read more
Citations
More filters
Journal ArticleDOI
Multiphase chemistry at the atmosphere-biosphere interface influencing climate and public health in the anthropocene.
Ulrich Pöschl,Manabu Shiraiwa +1 more
TL;DR: This work addresses air contaminants and their multiphase chemical interactions at the atmosphere−biosphere interface, including human lungs and skin, plant leaves, cryptogamic covers, soil, and aquatic surfaces, and the chemical interactions of reactive oxygen species and reactive nitrogen species, as well as carbonaceous combustion aerosols.
Journal ArticleDOI
Direct observations of the atmospheric processing of Asian mineral dust
TL;DR: In this article, the accumulation of secondary acids and am- monium on individual mineral dust particles during ACE-Asia has been measured with an online single-particle mass spectrometer, the ATOFMS.
Journal ArticleDOI
Amorphous and crystalline aerosol particles interacting with water vapor: conceptual framework and experimental evidence for restructuring, phase transitions and kinetic limitations
TL;DR: In this paper, a conceptual framework for the interaction of amorphous aerosol particles with water vapor is presented, outlining characteristic features and differences in comparison to crystalline particles, and a hygroscopicity tandem differential mobility analyzer (H-TDMA) is used to characterize the hydration and dehydration of crystalline ammonium sulfate and oxalic acid.
Journal ArticleDOI
Recent progress in understanding physical and chemical properties of African and Asian mineral dust
Paola Formenti,Lothar Schütz,Yves Balkanski,Karine Desboeufs,Martin Ebert,Konrad Kandler,Andreas Petzold,Dirk Scheuvens,Dirk Scheuvens,Stephan Weinbruch,Daizhou Zhang +10 more
TL;DR: A review of recently acquired knowledge on the physico-chemical properties of mineral dust from Africa and Asia based on data presented and discussed during the Third International Dust Workshop, held in Leipzig (Germany) in September 2008 is presented in this paper.
References
More filters
Journal ArticleDOI
Role of mineral aerosol as a reactive surface in the global troposphere
TL;DR: In this paper, a global three-dimensional model of the troposphere is used to simulate the sources, abundances, and sinks of mineral aerosol and the species involved in the photochemical oxidant, nitrogen, and sulfur cycles.
Journal ArticleDOI
Heterogeneous chemistry and tropospheric ozone
TL;DR: In this article, it is recommended that standard O 3 models include in their chemical mechanisms the following reaction probability parameterizations for reactive uptake of gases by aqueous aerosols and clouds: γ HO 2 =0.2 (range 0.1-1) for HO 2 → 0.5 H 2 O 2, γ NO 2 =10 −4 (10 −6 −10 −3 ) for NO 2 → HNO 3, and γ N 2 O 5 → 2 H NO 3.
Journal ArticleDOI
Incorporation of mineralogical composition into models of the radiative properties of mineral aerosol from UV to IR wavelengths
Irina N. Sokolik,Owen B. Toon +1 more
TL;DR: In this paper, a technique to model the radiative properties of mineral aerosols which accounts for their composition is described. But the authors focus on the spectral properties of the aerosols and do not consider the physical properties of these aerosols.
Journal ArticleDOI
Long-range transport of North African dust to the eastern United States
TL;DR: The long-range transport of North African dust to the Middle East, Europe, South America, and the Caribbean has been well documented during the past 25 years as discussed by the authors, with the advent of routine collection and analysis of fine aerosols at national parks, monuments, and wilderness areas in the continental United States.
Journal ArticleDOI
Long-range transport of Asian dust to the Lower Fraser Valley, British Columbia, Canada
TL;DR: For the first time, long-range transport of Kosa mineral aerosol from western China to southwestern British Columbia is documented in this paper, which coincides with an episode of photochemical smog and reduced dispersion in the Lower Fraser Valley (LFV).