Within this ENVISAT validation project [AO-191] ground-based measurements of different techniques have been performed at Kiruna in the Arctic and on Tenerife Island in the subtropics. These ground-based data were used to validate column amounts derived from SCIAMACHY as well as profiles from MIPAS....
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.212.1087 http://envisat.esa.int/pub/ESA_DOC/envisat_val_1202/proceedings/ACV/ground_based/14_AOID191.pdf |
| Summary: | Within this ENVISAT validation project [AO-191] ground-based measurements of different techniques have been performed at Kiruna in the Arctic and on Tenerife Island in the subtropics. These ground-based data were used to validate column amounts derived from SCIAMACHY as well as profiles from MIPAS. While SCIAMACHY O3 columns of versions up to 3.53 differ significantly from ground-based DOAS and FTIR measurements, the agreement of more recent 4.0 data is quite reasonable. Also SCIAMACHY NO2 column amounts obtained with software version 4.0 agree quite nicely with ground-based DOAS (a.m.) and FTIR results from Tenerife Island. While SCIAMACHY NO2 version 3.53 data compared with ground-based DOAS and FTIR data from Kiruna show some offset. MIPAS O3 profiles measured before November 13, 2002 show an error in altitude assignment of about 1.5 km, which is consistent with other validation studies. This results in a MIPAS O3 profile which is about 0.8 ppmv too large at low altitudes and about 0.8 ppmv too low at altitudes around 30 km. Considering the altitude shift or using MIPAS profiles versus pressure the agreement is much better. The mean differences of MIPAS O3 profiles compared to ground-based FTIR are less than 0.4 ppmv. MIPAS HNO3 concentration gradients as a function of altitude are reduced compared to FTIR, resulting in a maximum which is broader. MIPAS N2O profiles agree nicely above about 18 km, but are too large for |
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