25–28 Nov 2024
Fritz-Haber-Institut
Europe/Berlin timezone

3.PC. Uptake of Ammonia by Ice Surfaces at Atmospheric Temperatures

27 Nov 2024, 14:00
2h
Fritz-Haber-Institut

Fritz-Haber-Institut

PC Poster Session PC Poster Session

Speaker

Clemens Richter (Fritz-Haber-Institute of the Max-Planck Society)

Description

We present an ambient pressure X-ray photoelectron spectroscopy investigation of the adsorption of ammonia on ice over the temperature range of -23 °C to -50 °C. Previous flow tube studies showed significant uptake of ammonia at these temperatures to ice, which was linked to the incorporation of ammonium into the ice crystal lattice. Our present investigation shows a significant uptake of ammonia to the ice interface, with ammonia concentrations exceeding those measured in past studies for the case of bulk snow and ice. We also have indication that some of the ammonia is protonated at the ice surface and thus adsorbed there as ammonium ions. The impact of high ammonia concentrations at the air-ice interface on the surface chemistry of ice clouds is discussed. The present study lays the groundwork for investigating the reaction of adsorbed ammonia with other trace gases in the atmosphere, which is demonstrated on the example of a proof-of-principle experiment of its interaction with acetic acid.

Primary authors

Clemens Richter (Fritz-Haber-Institute of the Max-Planck Society) Shirin Gholami (Fritz Haber Institute) Yanisha Manoharan (Paul Scherrer Institut) Tillmann Buttersack Luca Longetti (Paul Scherrer Institut) Luca Artiglia (Paul Scherrer Institut) Markus Ammann (Paul Scherrer Institut) Thorsten Bartels-Rausch (Paul Scherrer Institut) Hendrik Bluhm

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