Breakout Summary Report

 

ARM/ASR User and PI Meeting

10 - 13 June 2019

MARCUS and MICRE
13 June 2019
10:30 AM - 12:30 PM
17
Roger Marchand

Breakout Description

This session was a discussion of MARCUS and MICRE data sets and projects. It provided an opportunity for ARM/ASR PIs to present the latest results of research related to the Southern Oceans.

Main Discussion

<p>Four presentations were given:</p>

<p><strong>Scott Giangrande: Overview of some ongoing processing activities by infrastructure</strong></p>
<ul>
<li>CIMEL sunphotometer cloud optical depth retrieval will be run "in house"</li>
<li>ConConfirmed MWACR spectra were collected (Roj needs to evaluate this)</li>
<li>There was brief discussion of motion correction of radar Doppler velocities -> data with correction for ship motion is available. Correction is far from perfect, and these data should be used with due caution</li>
</ul>

<p><strong>Jay Mace: Ice- versus liquid-phase precipitation from SO low clouds</strong></p>
<ul>
<li>Discussed importance to cloud albedo</li>
<li>Examined statistics of co-incident CloudSat Reflectivity and Calipso identified horizontally-orientated ice (at cloud top)</li>
<li>Looked at examples showing correlation between MARCUS updrafts and precipitating ice and argued for role of secondary ice production</li>
<li>My take-away: There was a lot of discussion and interest in relationship between dynamics, ice precipitation, and importance of secondary ice production for these clouds. Processing of lidar depolarization for precipitation phase (not just cloud phase) needs to be prioiritized</li>
</ul>

<p><strong>Bart Geerts: Case Study</strong></p>
<ul>
<li>Showed a precipitation shallow (2 km) precipitating cumulus case that his group is analyzing (Feb 24/25 2018)</li>
<li>Likely good example of graupel event and interested in how to use PARSIVEL disdrometer data → Roj agreed to help with this.</li>
</ul>

<p><strong>Roj Marchand</strong></p>
<ul>
<li>Finished presentation of cloud statistics from MICRE</li>
<li>Discussion: Some surprising differences in result between MICRE results from CAPRICORN I (higher fraction of precipitation clouds, fewer "lidar-only" clouds) that need to be investigated</li>
<li>Most surprising results is apparent LW error in CERES SYN. (David Rutan pointed out that there is a bias correction in EBAF that I/Hinkelman needs to evaluate too)</li>
<li>It was suggested that I make similar data sets for CAPRICORN I and II</li>
</ul>

Key Findings

None.

Issues

<ul>
<li>There wil be a Southern Ocean Atmospheric Research (SOAR) science meeting in Hobart in November</li>
<li>Also, there is likely to be an AGU session at the winter meeting</li>
<li>Expect "broad survey" paper will be completeed this year and overview paper for</li>
<li>MARCUS/MICRE/SOCRATES/CAPRICORN submitted to BAMS</li>
</ul>

Needs

None.

Decisions

None.

Future Plans

<ul>
<li>There wil be a Southern Ocean Atmospheric Research (SOAR) science meeting in Hobart in November</li>
<li>Also, there is likely to be an AGU session at the winter meeting</li>
<li>Expect "broad survey" paper will be completeed this year and overview paper for</li>
<li>MARCUS/MICRE/SOCRATES/CAPRICORN submitted to BAMS</li>
</ul>

Action Items

Nothing specific for ARM.

<p>Various items/suggestions were made for Marchand/Mcfarquhar to follow up.