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ECHAM activities – Ulrike Lohmann’s group

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  1. ECHAM activities – Ulrike Lohmann’s group • SylvaineFerrachat: Maintainance of ECHAM6-HAM and previously developed aspects (entrainment, PBL clouds, shallow convection) • Philipp Reutter/Betty Croft: aerosol processing and scavenging of aerosols • Ana Sesartic: bioaersols and their possible importance as ice nuclei (IN) • VivekSant: drizzle and giant CCN • Miriam Kübbeler: heterogeneous vs. homogeneous freezing in cirrus clouds • Sebastian Bretl: possible influence of aerosols on tropical cyclones VivekSant Group Meeting February 1, 2011 1

  2. Impact of wet scavenging on global aerosol and cloud properties in ECHAM5 (Philipp Reutter) Reference scavenging ratios changed following a study in the Arctic study by Bourgeious and Bey (2011).

  3. Less cloud droplet number burden and less soluble nucleation and Aitken mode particles when scavenging ratios are reduced • Mechanism: • Initially more aerosol particles. • Nucleation of new particles impeded, more condensation of SO4 and organics on pre-existing particles. • Coagulation and less new particle formation lead to a reduction of the number mixing ratio of smallest modes.

  4. IACETH Institute for Atmospheric and Climate Science Bacteria and fungal spores in ECHAM (Ana Sesartic) • Impact on clouds & radiation • small global impact • regional impact suspected • Possible future research • models with dynamic vegetation • regional modelling • observations & lab studies

  5. Introducing a drizzle class in ECHAM5 (VivekSant) today Bretherton et al., 2001 future Courtesy of R. Posselt Vivek Sant Group Meeting February 1, 2011 5

  6. Impact of aerosols on cirrus clouds (Miriam Kübbeler) Kärcher et al., JGR, 2006

  7. Impact of aerosols on cirrus clouds (Miriam Kübbeler)

  8. Influence of aerosols on hurricanes? (Sebastian Bretl)