# Presentation: 814406

## Global O3 and CO:A view from TES

- Annmarie Eldering and the TES team
- November 2005

## Transport and dynamics

- emissions

- Radiation/ photochemistry

## Outline and Data

- Start with seasonal look at the big picture with maps
- Vertical distributions
- Between Asia and N.A.
- Between N.A and Europe
- West of Africa

- Using V1 data, available at the DAAC
- Data has been screened
- Presenting averages of 5 global data sets for three different time periods

## NH ozone present throughout the troposphere at this time of year, as expected.

- TES observes CO and lower troposphere ozone in biomass burning region.

**Notes:**
These are 5 day running averages of TES data. This shows the tropospheric ozone and CO. CO is fairly low in this season, but there is some enhancement in the biomass burning region.  Ozone is elevated over the northern hemisphere  continents.

The TROP plot is the average up to the tropopause. UT and LT are columns from the surface to half way to the tropopasue (LT) and from the middle of the tropopause to the tropopause (UT). The middle of the tropopause is calculated in log pressure.

## Ozone higher in the southern hemisphere during their summer. In contrast to August, SH ozone is in upper troposphere, NH ozone is in lower troposphere. There are few CO hotspots.

## March reveals elevated O3 and CO in the northern hemisphere, most of the ozone appears to be in the lower troposphere.

## We now look at the vertical distribution in three regions.

## Between US and Europe

- Weak latitudinal gradient in the lower troposphere in August. Vertical distribution of tropospheric column can be explored with TES data

## March

- Aug

- Nov

- Mean wind fields at 300mb (top row) and 700mb (bottom row)

## Mean winds 300mb

- Model estimates of flux of ozone into Europe (12.5W), Auvray and Bey, JGR, 2005

## Vertical distribution of ozone between Asia and US over the year

- Consistent with spatial patterns of spring time maximum in trans-pacific transport of Asian pollution (Liu et al, JGR, 2005)

## Southern Hemisphere -West of Africa

- August ozone much more elevated than other seasons, especially in lower troposphere. March and November show elevated ozone in the upper troposphere.

## Biomass emissions have strong seasonal dependence.

- Wind patterns have less seasonal dependence than other regions studied, generally weak winds north of 20S.

## West of africa

- In August, elevated CO and ozone near the surface. The November ozone in the upper troposphere corresponds to elevated CO, which is not explained by biomass emissions.

## Conclusions

- TES ozone vertical distributions show new, global, information about ozone variation in the lower and upper troposphere.
- Simultaneous CO profiles are valuable in relating ozone to emissions and transport.

## Backup slides

## Mean wind fields at 300mb (top row) and 700mb (bottom row)

- March

- Aug

- Nov

## Between Asia and US

- Limited CO sensitivity makes it difficult to assess relative roles of transport and chemistry in this region.

## Vertical distribution of O3 and CO offer new insights to pollution formation.

**Notes:**
These figures are vertical slices, showing the latitudinal and vertical dependence of CO and ozone.
West of Africa there is a lot of ozone in the lower troposphere, and CO near the equator.
Between Asia and North America, there are regions of elevated CO and ozone, but ozone is lower near the equator.

## Slide 20

## In contrast to August, November shows less near surface ozone off of Africa, increased ozone between Asia and North America