Novel method of generation of Ca(HCO3)(2) and CaCO3 aerosols and first   determination of hygroscopic and cloud condensation nuclei activation   properties

doi:10.5194/acp-10-8601-2010

CORC > 北京大学 > 环境科学与工程学院

	Novel method of generation of Ca(HCO3)(2) and CaCO3 aerosols and first determination of hygroscopic and cloud condensation nuclei activation properties
	Zhao, D. F. ; Buchholz, A. ; Mentel, Th F. ; Mueller, K.P. ; Borchardt, J. ; Kiendler-Scharr, A. ; Spindler, C. ; Tillmann, R. ; Trimborn, A. ; Zhu, T. ; Wahner, A.
刊名	atmospheric chemistry and physics
	2010
关键词	MINERAL DUST AEROSOL NITRIC-ACID HETEROGENEOUS REACTION CALCIUM-CARBONATE MASS-SPECTROMETER PARTICLE PHASE MIXING STATE HNO3 KINETICS CONVERSION
DOI	10.5194/acp-10-8601-2010
英文摘要	Atmospheric mineral aerosols contain CaCO3 as a reactive component. A novel method to produce CaCO3 aerosol was developed by spraying Ca(HCO3)(2) solution, which was generated from a CaCO3 suspension and CO2. By aerosol mass spectrometry the freshly sprayed and dried aerosol was characterized to consist of pure Ca(HCO3)(2) which under annealing in a tube furnace transformed into CaCO3. Transmission Electron Microscopy demonstrated that the particles produced were spherical. The method was able to generate aerosol of sufficient concentration and proper size for the study of physiochemical properties and investigations of heterogeneous reactions of mineral aerosol. The dried Ca(HCO3)(2) particles were somewhat more hygroscopic than CaCO3 particles. However, during humidification a restructuring took place and similar to 2/3 of the Ca(HCO3)(2) was transformed to CaCO3. The mixed Ca(HCO3)(2)/CaCO3(s) particles were insoluble with a growth factor of 1.03 at 95% (hygroscopicity parameter kappa=0.011 +/- 0.007) relative humidity. This compares to a corresponding growth factor of 1.01 for CaCO3(s) (kappa=0.0016 +/- 0.0004). Mass spectrometric composition analysis, restructuring, and insolubility of the mixed particles suggested that solid Ca(HCO3)(2)(s) was observed. This would be in contrast to the current belief that Ca(HCO3)(2)(s) is thermodynamically instable. The CCN activity of Ca(HCO3)(2)(s) aerosol (kappa 0.15) is remarkably higher than that of CaCO3 aerosol (kappa=0.0019 +/- 0.0007) and less than that of Ca(NO3)(2). The noticeable but limited solubility of Ca(HCO3)(2) of 0.01 mol/l explains limited hygroscopic growth and good CCN activity. Experiments in the Large Julich Aerosol Chamber indicated that Ca(HCO3)(2)(s) could exist for several hours under dry atmospheric conditions. However, it was likely buried in a protective layer of CaCO3(s). We conclude that Ca(HCO3)(2) may be formed in the atmosphere in cloud droplets of activated mineral dust by reaction of CaCO3 with CO2 and H2O. The presence of Ca(HCO3)(2) and as a consequence an enhanced CCN activity may alter the influence of mineral aerosol on global climate.; Meteorology & Atmospheric Sciences; SCI(E); 4; ARTICLE; 17; 8601-8616; 10
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/324473]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Zhao, D. F.,Buchholz, A.,Mentel, Th F.,et al. Novel method of generation of Ca(HCO3)(2) and CaCO3 aerosols and first determination of hygroscopic and cloud condensation nuclei activation properties[J]. atmospheric chemistry and physics,2010.
APA	Zhao, D. F..,Buchholz, A..,Mentel, Th F..,Mueller, K.P..,Borchardt, J..,...&Wahner, A..(2010).Novel method of generation of Ca(HCO3)(2) and CaCO3 aerosols and first determination of hygroscopic and cloud condensation nuclei activation properties.atmospheric chemistry and physics.
MLA	Zhao, D. F.,et al."Novel method of generation of Ca(HCO3)(2) and CaCO3 aerosols and first determination of hygroscopic and cloud condensation nuclei activation properties".atmospheric chemistry and physics (2010).