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Novel method of generation of Ca(HCO3)2 và CaCO3 aerosols và first determination of hygroscopic và cloud condensation nuclei activation properties D. F. Zhao1,2, A. Buchholz2, Th. F. Mentel2, K.-P. Müller2, J. Borchardt2, A. Kiendler-Scharr2, C. Spindler2, R. Tillmann2, A. Trimborn3, T. Zhu1, and A. Wahner2 D. F. Zhao et al. D. F. Zhao1,2, A. Buchholz2, Th. F. Mentel2, K.-P. Müller2, J. Borchardt2, A. Kiendler-Scharr2, C. Spindler2, R. Tillmann2, A. Trimborn3, T. Zhu1, and A. Wahner2


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1State Key Joint Laboratory of Environmental Simulation và Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, trung quốc 2Forschungszentrum Jülich, Institut für Chemie und Dynamik der Geosphäre − 2: Troposphäre, 52425 Jülich, Germany 3Aerodyne Research Inc., 45 Manning Rd, Billerica, MA 01821, USA
1State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences và Engineering, Peking University, Beijing, 100871, đài loan trung quốc 2Forschungszentrum Jülich, Institut für Chemie und Dynamik der Geosphäre − 2: Troposphäre, 52425 Jülich, Germany 3Aerodyne Research Inc., 45 Manning Rd, Billerica, MA 01821, USA Hide author details
Received: 10 Mar 2010 – Discussion started: 26 Mar 2010 – Revised: 12 Aug 2010 – Accepted: 16 Aug 2010 – Published: 14 Sep 2010

Abstract. Atmospheric mineral aerosols contain CaCO3 as a reactive component. A novel method khổng lồ produce CaCO3 aerosol was developed by spraying Ca(HCO3)2 solution, which was generated from a CaCO3 suspension & CO2. By aerosol mass spectrometry the freshly sprayed & 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 & proper form 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 và ∼2/3 of the Ca(HCO3)2 was transformed lớn CaCO3. The mixed Ca(HCO3)2/CaCO3(s) particles were insoluble with a growth factor of 1.03 at 95% (hygroscopicity parameter κ=0.011±0.007) relative humidity. This compares lớn a corresponding growth factor of 1.01 for CaCO3(s) (κ=0.0016±0.0004). Mass spectrometric composition analysis, restructuring, & insolubility of the mixed particles suggested that solid Ca(HCO3)2(s) was observed. This would be in contrast khổng lồ the current belief that Ca(HCO3)2(s) is thermodynamically instable. The CCN activity of Ca(HCO3)2(s) aerosol (κ≈0.15) is remarkably higher than that of CaCO3 aerosol (κ=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 Jülich 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 và as a consequence an enhanced CCN activity may alter the influence of mineral aerosol on global climate.


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How to cite. Zhao, D. F., Buchholz, A., Mentel, Th. F., Müller, K.-P., Borchardt, J., Kiendler-Scharr, A., Spindler, C., Tillmann, R., Trimborn, A., Zhu, T., & Wahner, A.: Novel method of generation of Ca(HCO3)2 và CaCO3 aerosols & first determination of hygroscopic và cloud condensation nuclei activation properties, Atmos. Chem. Phys., 10, 8601–8616, https://doi.org/10.5194/gamize.vn-10-8601-2010, 2010.