Topics

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PM4 - Esrin, 5th Nov 2004

DFCI

Topics

1. MWs Joint Retrieval of pT, H2O, O3 without CO2MIX as a source of systematic error; MWs Joint Retrieval of pT, H2O, O3, CO2 to improve p and CO2 sensitivity (pT, CO2 not good as their features are not well separated).

2. Minor species: H2O2 retrieval as an example of specie not yet retrieved.

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PT, H2O, O3 Spectral Range: 685 – 825 cm-1• Q – branches of CO2

• CO2 line – mixing model has been integrated in the MTR code, these MWs have been sel. to test it

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PT, H2O, O3, CO2 Spectral Range: all bands

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We are looking if it is possible to improve CO2 accuracy.

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H2O2

OH + O3 HO2 + O2

HO2 + HO2 H2O2 + O2

• H2O2 is important as a sink of OH which plays an important role in atmosphere chemistry (OH reacts with CO and CH4)

• Lifetime OH about 10 seconds

Lifetime H2O2 about 1 day

• H2O2 is created by O3

Short lifetime

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H2O2 Spectral Range: Band B

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• Retrieval can be

performed in troposphere – stratosphere regions but not in mesosphere

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• Example of a real H2O2

retrieval

• Blue and red colors = good retrieval

• ORBIT 208124 JUL 2002No data scan 0, 58,59• Max at 10 mb in eq. regions• PSC in south pole

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• ORBIT 2081(from north pole to south pole, day time)• Good agreement retrieved and Slimcat model for the Max at 10 mb in eq. regions and minimum below• We don’t see the equatorial peak at 200 mb and Slimcat peak is larger

Comparison retrieved - Slimcat

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• ORBIT 2081

• Where ozone has a peak also H2O2 has a peak and where ozone has a minimum again H2O2 has a minimum

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Conclusions

• New MWs set for joint retrieval pT H2O, O3 without CO2 error component (to be tested with geofit + line mixing model).

• New MWs set for joint retrieval pT H2O, O3, CO2.

• H2O2 can be retrieved with MIPAS data.

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