vivek santgroup meeting echam activities – ulrike lohmann’s group 1 february 1, 2011 sylvaine...
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![Page 1: Vivek SantGroup Meeting ECHAM activities – Ulrike Lohmann’s group 1 February 1, 2011 Sylvaine Ferrachat: Maintainance of ECHAM6-HAM and previously developed](https://reader037.vdocuments.us/reader037/viewer/2022110322/56649d425503460f94a1d8b6/html5/thumbnails/1.jpg)
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
![Page 2: Vivek SantGroup Meeting ECHAM activities – Ulrike Lohmann’s group 1 February 1, 2011 Sylvaine Ferrachat: Maintainance of ECHAM6-HAM and previously developed](https://reader037.vdocuments.us/reader037/viewer/2022110322/56649d425503460f94a1d8b6/html5/thumbnails/2.jpg)
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)
![Page 3: Vivek SantGroup Meeting ECHAM activities – Ulrike Lohmann’s group 1 February 1, 2011 Sylvaine Ferrachat: Maintainance of ECHAM6-HAM and previously developed](https://reader037.vdocuments.us/reader037/viewer/2022110322/56649d425503460f94a1d8b6/html5/thumbnails/3.jpg)
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.
![Page 4: Vivek SantGroup Meeting ECHAM activities – Ulrike Lohmann’s group 1 February 1, 2011 Sylvaine Ferrachat: Maintainance of ECHAM6-HAM and previously developed](https://reader037.vdocuments.us/reader037/viewer/2022110322/56649d425503460f94a1d8b6/html5/thumbnails/4.jpg)
Impact on clouds & radiation • small global impact
• regional impact suspected
Possible future research• models with dynamic
vegetation• regional modelling
• observations & lab studies
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Bacteria and fungal spores in ECHAM (Ana Sesartic)
![Page 5: Vivek SantGroup Meeting ECHAM activities – Ulrike Lohmann’s group 1 February 1, 2011 Sylvaine Ferrachat: Maintainance of ECHAM6-HAM and previously developed](https://reader037.vdocuments.us/reader037/viewer/2022110322/56649d425503460f94a1d8b6/html5/thumbnails/5.jpg)
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
![Page 6: Vivek SantGroup Meeting ECHAM activities – Ulrike Lohmann’s group 1 February 1, 2011 Sylvaine Ferrachat: Maintainance of ECHAM6-HAM and previously developed](https://reader037.vdocuments.us/reader037/viewer/2022110322/56649d425503460f94a1d8b6/html5/thumbnails/6.jpg)
Impact of aerosols on cirrus clouds (Miriam Kübbeler)
Kärcher et al., JGR, 2006
![Page 7: Vivek SantGroup Meeting ECHAM activities – Ulrike Lohmann’s group 1 February 1, 2011 Sylvaine Ferrachat: Maintainance of ECHAM6-HAM and previously developed](https://reader037.vdocuments.us/reader037/viewer/2022110322/56649d425503460f94a1d8b6/html5/thumbnails/7.jpg)
Impact of aerosols on cirrus clouds (Miriam Kübbeler)
![Page 8: Vivek SantGroup Meeting ECHAM activities – Ulrike Lohmann’s group 1 February 1, 2011 Sylvaine Ferrachat: Maintainance of ECHAM6-HAM and previously developed](https://reader037.vdocuments.us/reader037/viewer/2022110322/56649d425503460f94a1d8b6/html5/thumbnails/8.jpg)
Influence of aerosols on hurricanes? (Sebastian Bretl)