# Presentation: 224406

## Evaluation of GMI simulations with TES ozone data:  indirect validation of TES

**Jennifer Logan, Bryan Duncan, Jose Rodriguez, Lin Zhang, Inna Megretskaia, and the TES and GMI Science Teams **
**Harvard University and NASA/GFSC**

**AGU, December 15, 2006**

## The Global Modeling Initiative (GMI) ‘Combo’ Model

**‘****Combo’ = tropospheric + stratospheric chemical mechanism (122 species, >300 thermolytic rxns, 78 photolytic rxns)**
**Stratospheric heritage from Goddard model **
**Tropospheric heritage in part from GEOS-Chem**

**Meteorological fields from GEOS-4: DAS, DAS Forecast and GCM**
**   **
**   ****2° latitude x 2.5° longitude resolution**
** ****~1 km resolution below 10 hPa  (lid at 0.015 hPa)**
**   ****3 hr updates using 3-hr averages**

## GMI and Aura

**The Combo model has been run using assimilated meteorological fields for the Aura period (so far, Feb. 2004-Dec. 2005).**
**This model output is available to the community for Aura science.**
**We have been evaluating the Combo simulation for the troposphere and comparing to TES ozone data.**
**Daily ozone fields were archived.**
**Note – these are preliminary results, model updates are in progress.**
**In the next, improved version, daily ozone, CO and other fields will be archived, as required by the Aura teams.**

## Strategy

**By evaluating the model with in-situ data, we learn where the model does well and where there are deficiencies.**
**     ****Profile data available for ~50 locations (sondes and MOZAIC).**
**Having “calibrated” the model performance, compare the model and TES ozone.**
**If the model and TES agree where we know the model does well, we are confident that the discrepancies in other regions are “real”.**
**Explore the causes of these discrepancies**

## Ozone at N. extratropics, DAS and FVGCM 

**The DAS run looks great for tropospheric ozone **
**(see gmi.gsfs.nasa.gov for strat. evaluation by S. Strahan).****  **

## Sub-tropics and tropics, DAS and FVGCM

**DAS**** very low in BB season (NH and SH) in S. Atlantic**

## Ozone at 500hPa (MOZAIC data)

**FVGCM**
**DAS**

**South**
**U.S.**

**Middle**
**East**

**S. Asia**

**E. Atlantic**

## DAS vs. in-situ data500 hPa

_**DAS vs. in-situ data**__**500 hPa**_

**JULY**

**OCTOBER**

## TES – DAS comparisons

**Focus on July to December, 2005. **
**TES data much sparser before July 2005, before routine limb soundings were dropped.**
**TES validation with sondes shows TES is biased high by ~5 ppb at 500 hPa ****(Nassar et al., Richards et al).**
**Model sampled at TES profile locations on same day, and AKs and prior applied.**
**TES prior from MOZART model**
**Results gridded on 2x2.5 grid**
**Difference [(DAS with AK) –TES] removes prior**

## Combo-DAS vs. TES ozone, 511 hPa, July 2005

_**Combo-DAS vs. TES ozone, 511 hPa, July 2005**_

**(removes **
**prior)**

**DAS**

**TES**

**DAS with AK **

**DAS (w. AK/prior) –TES**

## Are TES comparisons consistent with validation of Combo-DAS using in-situ data?

** **_**TES comparison **__**in July**__** implies DAS is:**_
**Too low in N. tropical Atlantic**
**Too high over U.S. **
**Too low over W. Europe**
**OK in Middle East    ****	****                   **
**OK in S. Atlantic****	**
**TES results consistent with in-situ data where available**
**Indirect validation of TES possible**
**Shows model deficiencies**

## Combo-DAS vs. TES ozone, 511 hPa, October, 2005

## In situ data confirms the underestimate over the S. tropical Atlantic, and in the large scale ozone plume

**In situ data confirms the underestimate over the S. tropical Atlantic, and in the large scale ozone plume**
**TES comparisons show the extent of the underestimate**

## Combo-DAS vs. TES, December, 2005

_**Combo-DAS vs. TES, December, 2005**_

## DAS –TES Differences, July – December

**DAS –TES Differences, July – December**
**Regions where model is too high, as well as too low**

**JULY**

**AUG****.**

**SEPT.**

**OCT.**

**NOV**

**DEC**

## Summary

**The COMBO-DAS looks remarkably like sonde/MOZAIC data in many regions**
**Major discrepancies from sonde/MOZAIC data are in the tropical Atlantic sector, in the biomass burning season**
**TES comparisons show the spatial extent of the underestimate of ozone in:**
**the N. tropical Atlantic in July, less so in August**
**N and S. tropical Atlantic in August**
**Brazil, equatorial Atlantic and Africa in October, November**
**Central Africa in December**
**They show regions of overestimate of ozone in:**
**Eastern Indian Ocean in October - December  **
**Next step:  Improved emissions of NO****x**** in model, use Forecast fields (Duncan et al. ).**