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- W3043521237 abstract "<p>The Asian Tropopause Aerosol Layer (ATAL) has been found to be an aerosol layer with exceptionally high particle number concentrations in the UT/LS altitude range. During the StratoClim 2017 field campaign in Nepal we deployed the novel in-situ aerosol mass spectrometer ERICA (ERC Instrument for Chemical composition of Aerosols). It combines the methods of laser ablation mass spectrometry with flash vaporization/electron impact ionisation mass spectrometry in a single instrument to analyse the chemical composition of individual aerosol particles or small particle ensembles in the particle diameter range from 100 nm to 2 &#181;m.</p><p>The quantitative analysis shows a strong contribution of ammonium nitrate (AN) to the ATAL aerosol concentration. In this layer, the AN concentrations can be as high as 1.5 &#181;g per standard cubic meter. We present the vertical distribution of the mass concentrations of AN as well as other contributing species like sulphate and organics.</p><p>The single particle data from the laser ablation module of ERICA show a distinct particle type with nitrate and sulphate ions without the typical components of primary aerosol (soot, dust, metals) within the ATAL, indicating that a significant fraction of the ATAL aerosol consists of secondary particles formed in the upper troposphere.</p>" @default.
- W3043521237 created "2020-07-23" @default.
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- W3043521237 date "2020-03-23" @default.
- W3043521237 modified "2023-09-26" @default.
- W3043521237 title "Chemical composition of the ATAL aerosol measured by in-situ particle mass spectrometry" @default.
- W3043521237 doi "https://doi.org/10.5194/egusphere-egu2020-9949" @default.
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