Unique airborne observations of aerosol size spectral and chemical characteristics over the peninsular Indian region are illustrated in this case study. Multimodal lognormal distributions were required to fit observed situ distribution. The composition mixing state was deduced from single-particle analyses aerosols using transmission electron microscope soot photometer coupled with satellite re...

Abstract. Primary biological aerosol particles (PBAPs), such as bacteria, viruses, fungi, and pollen, represent a small fraction of the total burden. Based on process model studies, we identify trends in relative importance PBAP properties, e.g., number concentration, diameter, hygroscopicity, surface tension, contact angle, for their aerosol–cloud interactions optical properties. While concent...

Marine aerosol composition continues to represent a large source of uncertainty in the study of climate and atmospheric chemistry. In addition to their physical size and chemical composition, hygroscopicity plays a significant role, increasing the particles’ surface areas and scattering potential. Simultaneous aerosol measurements were performed on board the RRS Discovery and at the Cape Verde ...

V. Varutbangkul, F. J. Brechtel, R. Bahreini, N. L. Ng, M. D. Keywood, J. H. Kroll, R. C. Flagan, J. H. Seinfeld, A. Lee, and A. H. Goldstein Department of Chemical Engineering, California Institute of Technology, Pasadena, California, USA Brechtel Manufacturing Inc., Hayward, California, USA Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, Cali...

Abstract. The Cape Verde Atmospheric Observatory (CVAO), which is influenced by both marine and desert dust air masses, has been used for long-term measurements of different properties the atmospheric aerosol from 2008 to 2017. These include particle number size distributions (PNSD), light-absorbing carbon (LAC) concentrations cloud condensation nuclei (CCN) together with their hygroscopicity. ...

Five years of nearly continuous measurements aerosol hygroscopicity by a Humidified Tandem Differential Mobility Analyzer (HTDMA) at Mace Head research station are presented, making it the longest data set in marine environment and Northeast Atlantic region particular. The main goal this work was to examine seasonal patterns mixing state variety air masses. entire categorized into clean pollute...

Abstract. Liquid water in aerosol particles has a significant effect on their optical properties, especially light scattering, whose dependence chemical composition is investigated here using measurements made southern Beijing 2019. The measured by the particle scattering enhancement f(RH), where RH denotes relative humidity, which found to be positively and negatively impacted proportions of i...

Review: The manuscript shows laboratory results on activation and hygroscopic growth (up to 99.75% relative humidity) of aerosol particles made by HULIS and HULIS plus other species. These experimental data are further used to derive parameterizations for HULIS hygroscopicity and activation. The work is interesting and worth publication with some modifications. 1) I suggest to the authors to di...

Study by Thalman et al. presents results of κCCN and mixing state derived from sizeresolved CCN observations collected during the GoAmazon2014/5 campaign. From κCCN and additinal aerosol chemical composition measurements, the authors then estimate the hygroscopicity of the organic fraction κorg. The results presented in the study, together with those presented by Pöhlker et al (2016) in another...

Hygroscopic properties of ultrafine aerosol particles in the boreal forest: diurnal variation, solubility and the influence of sulfuric acid M. Ehn, T. Petäjä, H. Aufmhoff, P. Aalto, K. Hämeri, F. Arnold, A. Laaksonen, and M. Kulmala Division of Atmospheric Sciences, Department of Physical Sciences, P.O. Box 64, 00014 University of Helsinki, Finland Max-Planck Institute for Nuclear Physics (MPI...