1. Atmospheric Group Breakout • Oral presentations: • Reports on study progress in the Variability, Sensitivity and Aerosol subgroups in support of firming-up the measurement requirements in the atmosphere STM • Variability: Regional scale variation of trace gases as revealed by observations and modeling • Measurements at the 4 km baseline resolution will capture most of the observed variation • Regional models adequately represent natural variability for studies • Current column measurement precisions are sensitive to polluted conditions • Increased information at high resolution

2. Atmospheric Group Breakout • Vertical sensitivity: Vertical correlations; use of multispectral retrievals to improve sensitivity to the lowermost troposphere • Good progress demonstrating improved O3 retrieval sensitivity both in simulations and using actual observations • Capability clearly demonstrated for CO • More work needed to generalize case studies • Vertical correlations; vertical structure • Cross-species correlations • Aerosol: Pixel resolution, aerosol retrieval availability and cloud avoidance • Baseline 2-km pixel resolution is required for an 8 km AOD product • Cloud clearing needed at 1 km • Correlations between AOD/PM

3. Atmospheric Group Breakout • Other topics: • 2 new IIP instruments for GEO-CAPE • Capabilities of MTG/IRS for atmospheric composition • Mission planning discussion: • Accept current STM as working document, refine as necessary • Work to the Baseline Mission without worrying too much about Threshold and de-scopes at this stage: science must be compelling to the community! • (However, with GEO-CAPE part of an international constellation, Threshold and Baseline could be defined by the currently planned minimum and maximum measurement capabilities)

4. Atmospheric Group Breakout • Mission planning: • Discussion of hosted payloads and distributed implementation • General agreement that this is the only way GEO-CAPE will fly in the foreseeable future • Costs would be in line with DS: small $150m, medium $300m, large $720m • This is an opportunity to redefine perceptions of the mission • Need to work on advocacy, building community • Study areas: • Simultaneity and overlap of mission components • Trade-offs on instrumentation/access to space • Aim to have science requirements ready for Mission Concept Review in Spring 2013 • These drive Level-1 Document requirements: Only a few more things needed

5. Atmospheric priorities for future work • Opportunities: • Exploiting DISCOVER-AQ data • BAMS article (Fishman) • GEO temporal and spatial resolution – sell as breakthroughs; unique opportunities to test models • Setup a new set of WGs, focused on science • Mission: • IIP activities need to feed into GEO-CAPE feasibility • Studies to tie in other observations: aerosol/O3 lidar, IAGOS • Constellation w/Europe and Asia – communities working on same problem • Geographical domain for GC? • Flexibility in observing structure in order to improve detection

6. Atmospheric priorities for future work • Responding to user community: • Applications version of the STM • Simulated GEO-CAPE datasets both for visualization and more quantitative assimilation studies • Focus on AQ – forecasting and attribution • GEO-CAPE presence at next AMI workshop • Focus on AQ – forecasting and attribution • GEO-CAPE presence at next AMI workshop • Strengthening climate ties: • Focus on SLCFs • Aerosol forcing integrated over daytime sun angles • Emphasis on CH4 as the GEO-CAPE greenhouse gas • Volcanic SO2 • Black/brown carbon info from GEO-CAPE

7. Atmospheric priorities for future work • Emissions: • Lightning NOx– lightning mapper on GOES-R combined with NO2 from GEOCAPE • Emissions from Canada/Mexico • Top-down constraints on emissions: area NOx, NH3, pseudo data + OSSE • Sensitivity of emissions to climate change • NH3 emissions from GEO-CAPE • Source attribution for background ozone; would also get radiativeforcing • OSSEs: • OSSES for ozone, ozone-CO-NO2, sensitibity studies • OSSES more attuned to user community: emissions, end impacts • Correlations of ozone-CO, ozone-AOD • Separating transport from local influences