# Presentation: X2MBFPKVV5XWNNUJAOF6SSOC6T2VJRLS

## Tropospheric Air Quality Working Group Report

- Ken Pickering (NASA GSFC)
- Annmarie Eldering (JPL)
- Bryan Duncan (NASA GSFC)

## Agenda

- Discussion of objectives
- Seven short talks – main focus on tropospheric ozone
- Discussion of what is needed to improve usefulness of Aura data for air quality purposes

## Current Aura Air Quality Activities

- Fishman:  OMI – NCEP/GFS SCO; Texas case studies
- Yang:  OMI – MLS with PV mapping
- Pickering:  OMI – MLS (Ziemke) vs. Eta/CMAQ
- Chatfield:  South-Central Calif. Air Quality analysis
- Kurosu:  OMI HCHO and CHO-CHO
- Levelt:  European air quality modeling and assimilations systems
- Bowman:  Use of TES O3 and CO in Texas AQS
- Krotkov:  Tropospheric SO2 over highly polluted regions
- Hoff:  Use of SSA from OMI in air quality analysis system
- Cohen:  Use of OMI NO2 in emission inventory for Calif.
- Hegarty:  Use of Aura data in North American outflow study
- Allen:  Comparisons of Aura data with WRF-Chem simulations over 	Mid Atlantic

## Definition of Air Quality

	EPA – health based (boundary layer)
	Atmospheric Composition/Satellite Community (lower tropospheric regime; including regional and long-range transport)

	Air pollution often travels above boundary layer & impacts surface via subsidence and/or fumigation.

- 	EPA – health based (boundary layer)
- 	Atmospheric Composition/Satellite Community (lower tropospheric regime; including regional and long-range transport)
- 	Air pollution often travels above boundary layer & impacts surface via subsidence and/or fumigation.

## Data Product Intercomparison Issues

- Talks by Fishman, Yang, & Pickering raised issue:  How do we compare Aura tropospheric ozone products using residual methods?
- 	 Difficulties arise due to various tropopause definitions. Therefore, standard definition is required.  But which one?  Compute TCO > 500 mb instead?
- Lack of spatial continuity of cross-track observations (variable pixel size).
- Coarseness of stratospheric column ozone removal.
- Should NASA support more near-real time data processing for mission planning & air quality forecasting?

## How well represented is convection in regional/global models?

- Boundary layer venting by convection is a critical process for air quality and long-range transport.
- Can Aura data be used to evaluate convective parameterizations in CTMs?

## Vertical Composition Information

- Vertical profile information is critical for assessing transport & air quality (e.g., above boundary layer versus near-surface composition and transport).
- Necessary to understand long-range transport versus *in situ* production of pollution.

## Neglected Issues

- We mostly discussed troposphere column ozone.
- But what about aerosols, NOx, CO, SO2, etc.?  Topics for next meeting?
- What is/can be Aura’s contribution to regional air quality issues?  Aura data coupled with surface data (e.g., AIRNow).
- How well does Aura compare with surface observations? More work needed.

## Holistic Approach?

- Can Aura data be coupled with *in situ* observations, assimilations, models, etc. to provide a more comprehensive picture of air quality?
- 	European approach?  RAQMS approach?

## The Future

- The working group only touched the surface of all of the issues related to use of Aura data for air quality.  We needed more time.
- Suggest keeping the dialog ongoing through e-mail listserve.