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  <h2>CMMAP low cloud feedback breakout</h2>
  <span style="color:#337799"><b>From</b> <a href="mailto:breth@washington.edu">
  Chris Bretherton</a></span><br />
  <span style="color:#337799"><b>Date</b> July 17, 2009</span><p></p>

Dear CMMAP low clouds people,<p></p>

     While I had planned to come to the upcoming team meeting, family 
matters now preclude this, and Peter Blossey has kindly agreed to lead
the low clouds breakout on the morning of Thursday 30 July instead.  If
you have a presentation for this breakout, let him know at
<a href="mailto:pblossey@gmail.com">pblossey@gmail.com</a> <p></p>

     Just to set the stage, here is what I see as some issues for
discussion and perhaps presentation:<ol>

<li>  First results from the GCSS-CFMIP column-modeling study on cloud 
feedbacks, which a several LES groups from CMMAP participated in.<p></p></li>

<li> Status of high-resolution MMF simulations for better simulation of 
boundary-layer cloud (Blossey?)<p></p></li>

<li> Implementation of high-order turbulent closure into Marat's 
MMF-compatible version of SAM, and prospects for MMF simulations with </li></li>
it. (Cheng? Lappen?)<p></p></li>

<li> Progress toward MMF simulations of global aerosol-cloud interaction 
(Ackerman?)<p></p></li>

  Group input for renewal proposal - I think that all of the above 
should be addressed in the renewal proposal.<p></p></li></ol>

I'm sure others of you have some thoughts or comments as well.  If so, 
please email them to the group before the meeting to stimulate a lively
discussion.  Thanks.<p></p>

      Chris<p></p>

  <br /><hr />

  <span style="color:#337799"><b>From</b> <a href="mailto:breth@washington.edu">
  Chris Bretherton</a></span><br />
  <span style="color:#337799"><b>Date</b> July 17, 2009</span><p></p>

...MMF aerosol/cloud update from Steve Ghan in attached email.<p></p>

   Chris<p></p>

---------------------<br />
From: "Ghan, Steven J" <Steve.Ghan@pnl.gov><br />
Date: July 17, 2009 3:38:17 PM MDT<br />
To: Chris Bretherton <breth@washington.edu><br />
Subject: Re: [Cmmaplct] CMMAP low cloud feedback breakout<p></p>


Chris, I am not attending the CMMAP meeting because we don't have anything
noteworthy to report yet on our efforts to put aerosols into the MMF, but we
finally have postdoc to do much of the work, so we are making good progress.
We have the cam aerosols talking to the Morrison microphysics in sam. We are
adding some instrument simulators before we try turning on Vince Larson's
turbulence scheme (CLUBB), which should greatly improve the low cloud
simulation. We'll start some simulations this fall. Please pass this on to
the rest of the low cloud folks.<p></p>

-Steve<p></p>

  <br /><hr />

  <span style="color:#337799"><b>From</b> <a href="mailto:pblossey@gmail.com">
  Peter Blossey</a></span><br />
  <span style="color:#337799"><b>Date</b> July 29, 2009</span><p></p>

Dear CMMAP low clouds group,<p></p>

A tentative agenda for the low clouds breakout on Thursday morning
<a href="low-cloud-agenda-Jul09.pdf">is
attached</a>.  We hope to have at least 45 minutes of discussion after the
research talks for the planning and coordination of near term
activities and for the contribution of ideas and directions for the
renewal proposal.  Chris outlines some discussion and action points in
his email below, but you are welcome to bring your own ideas as well.<p></p>

- Peter

  <br /><hr />

  <span style="color:#337799"><b>From</b> <a href="mailto:Steve.Ghan@pnl.gov">
  Steve Ghan</a></span><br />
  <span style="color:#337799"><b>Date</b> August 6, 2009</span><p></p>

I would like to suggest that Vince Larson and Hugh Morrison be added to this
team. <p></p>

Vince has applied his turbulence closure scheme to SAM with encouraging
results (improved shallow cumulus, improved transition from shallow to deep
convection). <p></p>

Hugh has developed a new representation of ice microphysics that offers
considerable advantages over traditional partitioning between cloud ice,
snow, and graupel.<p></p>

How would you feel about extending an invitation to them to join the CMMAP
team? <p></p>

-Steve

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