| MAD-CAT Multi Axis Doas - Comparison campaign for Aerosols and Trace gases | |
| Analysis settings | |
| Viewing angles: | |
| Standard viewing direction: Azimuth angle: 51° with respect to North Elevation angles: 1, 2, 3, 4, 5, 6, 8, 10, 15, 30, 90° Azimuth scans: every 2 hours (at even hours) at an elevation angle of 3°. These scans should be performed without gaps (including also looking e.g. at nearby buildings) (details of the measurement settings will be discussed and decided after we received from you information about integration times of different instruments) | |
| Fraunhofer reference spectra: | |
| Should be taken in zenith direction within plus/minus 15 minutes around 11:30 UTC (13:30 local time) | |
| Analyses for NO2 and O4: | |
| Two standard wavelength ranges should be used (UV and vis, see below). For each of these wavelength ranges standard settings should be used (see details below). In addition to these 'Standard analyses', each group might perform different analyses with their preferred settings (using e.g. different cross sections, Ring spectra, etc.).. | |
| (Download) | |
| a) NO2 and O4 Vis | |
| Wavelength range: | 425 - 490 nm |
| Reference spectra: | |
| NO2 | Vandaele, 298K (Io-correction should be |
| applied using a SCD of 1e17 molec/cm²) | |
| NO2 | Vandaele, 220K |
| (no2a_220p298K_vanDaele_vis.xs) | |
| O3 | Bogumil, 223K |
| O4 | Hermans et al |
| H2O | HITEMP (Rothman et al., 2010) |
| (provided by Ted Koenig) | |
| Ring | Ring_NDSC2003 (please follow the |
| instruction in the file header) | |
| Polynomial degree | 5 |
| Intensity offset | constant |
| * Cross sections are available at: (Download) | |
| * Note that the cross sections are given in air wavelengths. | |
| a1) NO2 **alternative VIS fitting range* | |
| Wavelength range: | 411 - 445 nm |
| Reference spectra: | |
| NO2 | Vandaele, 298K (Io-correction should be |
| applied using a SCD of 1e17 molec/cm²) | |
| NO2 | Vandaele, 220K |
| (no2a_220p298K_vanDaele_410-446nm.xs) | |
| O3 | Bogumil, 223K |
| O4 | Hermans et al |
| H2O | HITEMP (Rothman et al., 2010) |
| (provided by Ted Koenig) | |
| Ring | Ring_NDSC2003 (please follow the instruction |
| in the file header) | |
| Polynomial degree: | 4 |
| Intensity offset: | constant |
| * Cross sections are available at: (Download) | |
| * Note that the cross sections are given in air wavelengths. | |
| b) NO2 and O4 UV | |
| Wavelength range: | 338 - 370 nm |
| Reference spectra: | |
| NO2 | Vandaele, 298K (Io-correction should be |
| applied using a SCD of 1e17 molec/cm²) | |
| NO2 | Vandaele, 220K |
| (no2a_220p298K_vanDaele_UV.xs) | |
| O3 deconvoluted | Bogumil, 223K (Io-correction should be |
| applied using a SCD of 1e20 molec/cm²) | |
| O3 deconvoluted | Bogumil, 243K (Io-correction should be |
| applied using a SCD of 1e20 molec/cm²) | |
| O4 | Hermans et al |
| HCHO | Meller |
| BrO | Fleischmann |
| Ring | Ring_NDSC2003 (please follow the instruction |
| in the file header) | |
| Polynomial degree: | 5 |
| Intensity offset: | constant |
| * Cross sections are available at: (Download) | |
| * Note that the cross sections are given in air wavelengths. | |
| Data format: | |
| The data format was adapted from the CINDI campaign (see example at | |
| Template_UV_Version2.asc | |
| Template_Vis_Version2.asc | |
| Each data file contains results for one day. | |
| Please note that there is a change with respect to the intensities: -Intensities should not be normalised with respect to the noon spectrum; just the counts per integration time should be given -if possible intensities should be provided for the following wavelengths (similar to the AERONET wavelengths): | |
| 340 nm | |
| 380 nm | |
| 440 nm | |
| 500 nm | |
| 675 nm | |
| 870 nm | |
| 1020 nm | |