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- W2001380462 abstract "Observations often reveal large clear-sky upper tropospheric ice supersaturation, Si, which sometimes reaches 100%. However, a water activity criterion (Nature 2000, 406, 611) does not allow the buildup of large Si by cooled aqueous aerosol. According to the criterion, Si produced by aqueous aerosol increases from ∼52% at 220 K to only ∼67% at 185 K. The nature of the formation of large upper tropospheric Si remains unclear. Here we present the results of the study of micrometer-scaled three-, four-, and five-component droplets containing different weight fractions of H2O, H2SO4, HNO3, (NH4)2SO4, (NH4)HSO4, NH4NO3, and (NH4)3H(SO4)2. The study was performed between 133 and 278 K at cooling rates of 3, 0.1, and 0.05 K/min using differential scanning calorimetery. We find that complex phase transformations, which include one, two, and three freezing and melting events, glass transition on cooling, and devitrification and crystallization−freezing on warming, can occur during the cooling and warming of droplets. Using the measured freezing temperature of ice, Ti, and the thermodynamic E-AIM model, we calculate the largest clear-sky Si which would be formed immediately prior to the formation of ice cirrus by homogeneous freezing of multicomponent aerosol. The calculations show that multicomponent aerosol of some compositions may produce Si >80% at temperatures higher than 185 K. We also find that similar to that of H2SO4/H2O and H2SO4/HNO3/H2O aerosol the freezing of multicomponent aerosol can also produce mixed-phase cirrus particles: an ice core + a residual solution coating." @default.
- W2001380462 created "2016-06-24" @default.
- W2001380462 creator A5076234099 @default.
- W2001380462 creator A5090292188 @default.
- W2001380462 date "2010-02-08" @default.
- W2001380462 modified "2023-10-04" @default.
- W2001380462 title "Aqueous Aerosol May Build Up an Elevated Upper Tropospheric Ice Supersaturation and Form Mixed-Phase Particles after Freezing" @default.
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- W2001380462 doi "https://doi.org/10.1021/jp9086656" @default.
- W2001380462 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20136162" @default.
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