Status of Proposed L 2 Changes Anu Dudhia

Status of Proposed L 2 Changes Anu Dudhia University of Oxford Atmospheric, Oceanic & Planetary Physics, University of Oxford Page 1 A Dudhia MIPAS QWG 15 ESRIN 23 -25 Jan 2008

ØLUTs with CO 2 line-mixing ØNew Target Species ØMA Mode Retrievals (Cloud Height in FM - Jane Hurley) Atmospheric, Oceanic & Planetary Physics, University of Oxford Page 2 A Dudhia MIPAS QWG 15 ESRIN 23 -25 Jan 2008

LUTs with CO 2 Line-mixing v Look Up Tables for absorption cross-sections generated using a line-by-line model, the RFM v. 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 v. After that, include line-mixing model either Ø to recalculate current p. T LUTs, or Ø to select new p. T microwindows Atmospheric, Oceanic & Planetary Physics, University of Oxford Page 3 A Dudhia MIPAS QWG 15 ESRIN 23 -25 Jan 2008

New Target Species v Short Term: add Cl. ONO 2, N 2 O 5, CFC-11 and CFC-12 Ø FR and RR microwindows already exist Ø Already part of routine Oxford Retrievals Ø Some tests with ORM already completed (problem with current limit of C*4 molecule names? ) v Medium Term: additional molecules with lower signal/noise but still retrievable using standard ORM. Three stage process Ø Microwindow Selection Ø Run with Oxford code Ø Run with ORM code Atmospheric, Oceanic & Planetary Physics, University of Oxford Page 4 A Dudhia MIPAS QWG 15 ESRIN 23 -25 Jan 2008

MA Mode Retrieval v Short Term: use current set of microwindows but to retrieve 18 -70 km Ø Only requires new occupation matrices v Medium Term: augment retrieval with extra microwindows to extend altitude range Ø Requires new microwindow selection Ø Update of non-LTE errors also desirable Atmospheric, Oceanic & Planetary Physics, University of Oxford Page 5 A Dudhia MIPAS QWG 15 ESRIN 23 -25 Jan 2008

Atmospheric, Oceanic & Planetary Physics, University of Oxford Page 6 A Dudhia MIPAS QWG 15 ESRIN 23 -25 Jan 2008