Atmospheric, Oceanic & Planetary Physics, University of Oxford A Dudhia MIPAS QWG15 ESRIN Jan 2008 Page 1 Status of Proposed L2 Changes Anu Dudhia University of Oxford

Atmospheric, Oceanic & Planetary Physics, University of Oxford A Dudhia MIPAS QWG15 ESRIN Jan 2008 Page 2  LUTs with CO2 line-mixing  New Target Species  MA Mode Retrievals (Cloud Height in FM - Jane Hurley)

Atmospheric, Oceanic & Planetary Physics, University of Oxford A Dudhia MIPAS QWG15 ESRIN Jan 2008 Page 3  Look Up Tables for absorption cross-sections generated using a line-by-line model, the RFM  RFM currently undergoing a significant recoding to handle various HITRAN 2004 features such as new molecules, new file formats, and line-mixing flags - completion ~ months  After that, include line-mixing model either  to recalculate current pT LUTs, or  to select new pT microwindows LUTs with CO2 Line-mixing

Atmospheric, Oceanic & Planetary Physics, University of Oxford A Dudhia MIPAS QWG15 ESRIN Jan 2008 Page 4  Short Term: add ClONO2, N2O5, CFC-11 and CFC-12  FR and RR microwindows already exist  Already part of routine Oxford Retrievals  Some tests with ORM already completed (problem with current limit of C*4 molecule names?)  Medium Term: additional molecules with lower signal/noise but still retrievable using standard ORM. Three stage process  Microwindow Selection  Run with Oxford code  Run with ORM code New Target Species

Atmospheric, Oceanic & Planetary Physics, University of Oxford A Dudhia MIPAS QWG15 ESRIN Jan 2008 Page 5  Short Term: use current set of microwindows but to retrieve 18-70km  Only requires new occupation matrices  Medium Term: augment retrieval with extra microwindows to extend altitude range  Requires new microwindow selection  Update of non-LTE errors also desirable MA Mode Retrieval

Atmospheric, Oceanic & Planetary Physics, University of Oxford A Dudhia MIPAS QWG15 ESRIN Jan 2008 Page 6