Chemical analysis of the Asian tropopause aerosol layer (ATAL) with emphasis on secondary aerosol particles using aircraft-based in situ aerosol mass spectrometry

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Titel: Chemical analysis of the Asian tropopause aerosol layer (ATAL) with emphasis on secondary aerosol particles using aircraft-based in situ aerosol mass spectrometry

Beteiligte: Appel, Oliver [VerfasserIn]; Köllner, Franziska [VerfasserIn]; Dragoneas, Antonis [VerfasserIn]; Hünig, Andreas [VerfasserIn]; Molleker, Sergej [VerfasserIn]; Schlager, Hans [VerfasserIn]; Maohnke, Christoph [VerfasserIn]; Weigel, Ralf [VerfasserIn]; Port, Max [VerfasserIn]; Schulz, Christiane [VerfasserIn]; Drewnick, Frank [VerfasserIn]; Vogel, Bärbel [VerfasserIn]; Stroh, Fred [VerfasserIn]; Borrmann, Stephan [VerfasserIn]

Erschienen: Johannes Gutenberg-Universität Mainz, 2022

Sprache: Englisch

DOI: https://doi.org/20.500.12030/8850; https://doi.org/10.25358/openscience-8834

ISSN: 1680-7375

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Beschreibung: Aircraft-borne in situ measurements of the chemical aerosol composition were conducted in the Asian tropopause aerosol layer (ATAL) over the Indian subcontinent in the summer of 2017, covering particle sizes below ~ 3 μm. We have implemented a recently developed aerosol mass spectrometer, which adopts the laser desorption technique as well as the thermal desorption method for quantitative bulk information (i.e., a modified Aerodyne AMS), aboard the high-altitude research aircraft M-55 Geophysica. The instrument was deployed in July and August 2017 during the StratoClim EU campaign (Stratospheric and upper tropospheric processes for better Climate predictions) over Nepal, India, Bangladesh, and the Bay of Bengal, covering altitudes up to 20 kma:s:l: For particles with diameters between 10 nm and ~3 μm, the vertical profiles of aerosol number densities from the eight research flights show significant enhancements in the altitude range of the ATAL. We observed enhancements in the mass concentrations of particulate nitrate, ammonium, and organics in a similar altitude range between approximately 13 and 18 km (corresponding to 360 and 410K potential temperature). By means of the two aerosol mass spectrometry techniques, we show that the particles in the ATAL mainly consist of ammonium nitrate (AN) and organics. The single-particle analysis from laser desorption and ionization mass spectrometry revealed that a significant particle fraction (up to 70% of all analyzed particles by number) within the ATAL results from the conversion of inorganic and organic gas-phase precursors, rather than from the uplift of primary particles from below. This can be inferred from the fact that the majority of the particles encountered in the ATAL consisted solely of secondary substances, namely an internal mixture of nitrate, ammonium, sulfate, and organic matter. These particles are externally mixed with particles containing primary components as well. The single-particle analysis suggests that the organic matter within the ATAL and in ...

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