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Weigel, Ralf [VerfasserIn]; Mahnke, Christoph [VerfasserIn]; Tost, Holger [VerfasserIn]; Borrmann, Stephan [VerfasserIn]; Baumgartner, Manuel [VerfasserIn]; Krämer, Martina [VerfasserIn]; Spichtinger, Peter [VerfasserIn]; Spelten, Nicole [VerfasserIn]; Afchine, Armin [VerfasserIn]; Rolf, Christian [VerfasserIn]; Viciani, Silvia [VerfasserIn]; D'Amato, Francesco [VerfasserIn]

In situ observation of new particle formation (NPF) in the tropical tropopause layer of the 2017 Asian monsoon anticyclone – Part 2: NPF inside ice clouds

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  • Medientyp: E-Artikel
  • Titel: In situ observation of new particle formation (NPF) in the tropical tropopause layer of the 2017 Asian monsoon anticyclone – Part 2: NPF inside ice clouds
  • Beteiligte: Weigel, Ralf [VerfasserIn]; Mahnke, Christoph [VerfasserIn]; Tost, Holger [VerfasserIn]; Borrmann, Stephan [VerfasserIn]; Baumgartner, Manuel [VerfasserIn]; Krämer, Martina [VerfasserIn]; Spichtinger, Peter [VerfasserIn]; Spelten, Nicole [VerfasserIn]; Afchine, Armin [VerfasserIn]; Rolf, Christian [VerfasserIn]; Viciani, Silvia [VerfasserIn]; D'Amato, Francesco [VerfasserIn]
  • Erschienen: EGU, 2021
  • Erschienen in: Atmospheric chemistry and physics 21(17), 13455 - 13481 (2021). doi:10.5194/acp-21-13455-2021
  • Sprache: Englisch
  • DOI: https://doi.org/10.5194/acp-21-13455-2021
  • ISSN: 1680-7316; 1680-7324
  • Entstehung:
  • Anmerkungen: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Beschreibung: From 27 July to 10 August 2017, the airborne StratoClim mission took place in Kathmandu, Nepal, where eight mission flights were conducted with the M-55 Geophysica up to altitudes of 20 km. New particle formation (NPF) was identified by the abundant presence of nucleation-mode aerosols, with particle diameters dp smaller than 15 nm, which were in-situ-detected by means of condensation nuclei (CN) counter techniques. NPF fields in clear skies as well as in the presence of cloud ice particles (dp > 3 µm) were encountered at upper troposphere–lowermost stratosphere (UTLS) levels and within the Asian monsoon anticyclone (AMA). NPF-generated nucleation-mode particles in elevated concentrations (Nnm) were frequently found together with cloud ice (in number concentrations Nice of up to 3 cm−3) at heights between ∼ 11 and 16 km. From a total measurement time of ∼ 22.5 h above 10 km altitude, in-cloud NPF was in sum detected over ∼ 1.3 h (∼ 50 % of all NPF records throughout StratoClim). Maximum Nnm of up to ∼ 11 000 cm−3 was detected coincidently with intermediate ice particle concentrations Nice of 0.05–0.1 cm−3 at comparatively moderate carbon monoxide (CO) contents of ∼ 90–100 nmol mol−1. Neither under clear-sky nor during in-cloud NPF do the highest Nnm concentrations correlate with the highest CO mixing ratios, suggesting that an elevated pollutant load is not a prerequisite for NPF. Under clear-air conditions, NPF with elevated Nnm (> 8000 cm−3) occurred slightly less often than within clouds. In the presence of cloud ice, NPF with Nnm between 1500–4000 cm−3 was observed about twice as often as under clear-air conditions. NPF was not found when ice water contents exceeded 1000 µmol mol−1 in very cold air (< 195 K) at tropopause levels. This indicates a reduction in NPF once deep convection is prevalent together with the presence of mainly liquid-origin ice particles. Within in situ cirrus near the cold point tropopause, recent NPF or intense events with mixing ration nnm larger than 5000 mg−1 were ...
  • Zugangsstatus: Freier Zugang