vivek santgroup meeting echam activities – ulrike lohmann’s group 1 february 1, 2011 sylvaine...
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Vivek Sant Group Meeting
ECHAM activities – Ulrike Lohmann’s group
1February 1, 2011
• Sylvaine Ferrachat: 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)
• Vivek Sant: drizzle and giant CCN• Miriam Kübbeler: heterogeneous vs. homogeneous
freezing in cirrus clouds• Sebastian Bretl: possible influence of aerosols on
tropical cyclones
Reference scavenging ratios changed following a study in the Arctic study by Bourgeious and Bey (2011).
Impact of wet scavenging on global aerosol and cloudproperties in ECHAM5 (Philipp Reutter)
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.
Impact on clouds & radiation • small global impact
• regional impact suspected
Possible future research• models with dynamic
vegetation• regional modelling
• observations & lab studies
IACETH
Inst
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Bacteria and fungal spores in ECHAM (Ana Sesartic)
Vivek Sant Group Meeting
Introducing a drizzle class in ECHAM5 (Vivek Sant)
5
today
future
Courtesy of R. Posselt
February 1, 2011
Bretherton et al., 2001
Impact of aerosols on cirrus clouds (Miriam Kübbeler)
Kärcher et al., JGR, 2006
Impact of aerosols on cirrus clouds (Miriam Kübbeler)
Influence of aerosols on hurricanes? (Sebastian Bretl)
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