1. Cloud Dynamics and Microphysics Group
Institute for Climate and Atmospheric Science (ICAS)
Cloud Dynamics and Microphysics Group

2. The Cloud Group Stephen Yahui Alan G Theo John Barb Lindsay Tor
Zhiqiang
Mirek
Ken
Steven
Tom
Sardar
Bethan
Peter
Chris
Ralph
Ben
Doug
Alan B
Keith
Aerosols, dynamics,
climate, chemistry
Mark
Patricia
Jim
Sarah-Jane
Matt
Sonia Lasher-Trap
Jeff Trapp
Joris Brombach

3. Institute for Climate and Atmospheric Science (ICAS)
Cloud Dynamics and Microphysics Group
Cloud -aerosol interactions – Sc clouds
R<10 um
10<r<20
20<r<50
r>50
r>100
LCM model
Mean = –9.40 W m-2
Mean difference in radiative forcing (W m-2), between control and N = 375 cm-3 in regions of low-level maritime cloud, for SH Spring
SH season ΔF
(W m-2)
Sc amount
(%)
Summer (DJF)
–8.16
15.30
Autumn (MAM)
–6.35
14.95
Winter (JJA)
–7.52
15.95
Spring (SON)
–9.40
15.97
Semi-direct effect – Bin resolved LEM
bin
bulk

4. Institute for Climate and Atmospheric Science (ICAS)
Cloud Dynamics and Microphysics Group
AIDA Chamber, Karlsruhe
Cirrus studies
Glassy organic aerosols explain high in-cloud humidities in cirrus?
COSIC – contrails to cirrus
Mineral dust nucl
Leeds Cloud Proc Chamber
GCSS WG Cirrus – March 9th 2000 paper in prep

5. Institute for Climate and Atmospheric Science (ICAS)
Cloud Dynamics and Microphysics Group
ASCOS
First comprehensive observations in the central arctic:
Using UM and LEM (bin and bulk) to understand the complex couplings between cloud, radiation, dynamics, and the surface fluxes in unique arctic environment (e.g. low aerosol concentrations ) that is undergoing
How do the clouds maintain frequently 100s metres into the inversion?
- Where are the aerosols coming from?
How important is the coupling with the surface for arctic stratus?
Improve the UM.
Micro-meteorology masts
Tethered balloon
SODAR
ICAS measurements on the ice…