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Arctic cloud, circulation, and sea ice during 2007 and beyond ... Low-level Arctic mixed-phase clouds: Ice formation under polluted and pristine conditions ...

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Polar Cloud Working GroupCo-chairs: Hugh Morrison and James PintoBreakout Session IMonday, 2 June, 1400-1800Breakout Session IIWednesday, 4 June, 1400-1700


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Overview

Review of current research related to polar clouds (13 talks)

4 talks on cloud observations, recent field campaigns

2 talks on Arctic cloud-climate feedbacks

2 talks on ice formation processes in mixed-phase clouds

1 talk on parameterization development

4 talks on modeling results from MPACE


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Overview

Description of 2 new case studies for model intercomparison

Weakly-forced mixed-phase stratus from SHEBA

Kinematic 1-D microphysics tests

Discussion: Where do we go from here? (future efforts of Polar Cloud Working Group)

Focus on cloud types other than mixed-phase stratus? (ice-phase – diamond dust..)

Incorporation of new observational tools

Cloud-aerosol interaction (ISDAC, etc.)


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 14:00 – 14:05

H. Morrison and J. Pinto, co-chairs

Opening remarks

14:05 – 14:35

S. Ghan and Coauthors (presented by M. Dubey)

Indirect and Semi-Direct Aerosol Campaign (ISDAC): The influence of Arctic aerosol on clouds

14:35 – 14:55

P. Zuidema, P. Lawson, B. Baker, B. Pilson, and Q. Mo

Observations of summertime convective clouds in the Arctic from SHEBA

14:55 – 15:15

J. Remillard and P. Kollias

Cloud climatology and microphysics at Eureka using synergistic measurements from a cloud radar and a cloud-aerosol lidar.

15:15 – 15:35

J. Kay, A. Gettelman, K. Reader, T. L'ecuyer, and G. Stephens

Arctic cloud, circulation, and sea ice during 2007 and beyond

15:35 – 15:45

Discussion

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15:45 – 16:15                 COFFEE AND TEA

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Detailed Agenda


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16:15 – 16:35

T. Garrett, M. Maestas, and C. Zhao

The role of radiative-dynamic feedbacks in amplifying surface warming by Arctic stratus in polluted conditions

16:35 – 16:55

A. Fridlind and A. Ackerman

Low-level Arctic mixed-phase clouds: Ice formation under polluted and pristine conditions

16:55 – 17:15

G. de Boer, T. Hashino, G. Tripoli, and E. Eloranta

A possible role for immersion freezing in mixed-phase stratus clouds

17:15 – 17:35

D. Veron and N. Barton

Development of a mixed-phase cloud-radiation parameterization using SHEBA data

17:35 – 18:00

Discussion


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Wednesday June 4

14:00 – 17:00                 Polar Cloud Working Group Breakout Session I

Chair: Hugh Morrison

Venue: Room 2

14:00 – 14:20

D. Spangenburg, P. Minnis, and S. Sun-Mack

Cloud property retrievals over the Arctic from the A-Train satellites Aqua, Cloudsat, and Calipso

14:20 – 14:40

Steve Klein and Coauthors

Intercomparison of model simulations of mixed-phase clouds during MPACE, Part 1: Single-layer cloud

14:40 – 15:00

Hugh Morrison and Coauthors

Intercomparison of model simulations of mixed-phase clouds during MPACE, Part 1: Single-layer cloud

15:00 – 15:20

Y. Luo, K.-M. Xu, H. Morrison, G. McFarquhar, Z. Wang, and G. Zhang

Multi-layer mixed-phase clouds simulated by a cloud-resolving model: Comparison with ARM observations and sensitivity experiments.

15:20 – 15:40

A. Solomon, O. Persson, M. Shupe, H. Morrison, and J.-W. Bao

Mesoscale simulations of polar clouds during M-PACE

15:40 – 15:45

Discussion

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15:45 – 16:00                 COFFEE AND TEA

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16:00 – 16:20

      H. Morrison

      SHEBA springtime mixed-phase model intercomparison case,

1-D kinematic microphysics tests

16:20– 17:00

General discussion (topics TBA)


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