SCIAMACHY MLT nitric oxide (NO) number density data set

The netcdf files are sorted by measurement year, each containing the NO data from all orbits when SCIAMACHY measured in the MLT mode.

The files contain the following dimensions and variables:

Dimensions

Nr Dimension Unit Size Description
1 time days since 2000-01-01 00:00:00 (UTC) unlimited equatorial crossing time
2 altitude km 51 (50:150:2) central altitude of the retrieval bin (bin = +/- 1 km)
3 latitude degrees east 72 (-88.75:88.75:2.5) central latitude of the retrieval bin (bin = +/- 1.25°)

Variables

Nr Variable Unit Dimension Description
1 orbit 1 time Envisat orbit number
2 longitude degrees east time x latitude longitude of retrieval bin (not limited to [0, 360))
3 NO_DENS cm^{-3} time x latitude x altitude NO number density
4 NO_ERR cm^{-3} time x latitude x altitude absolute NO number density measurement uncertainty
5 NO_RSTD % time x latitude x altitude relative NO number density measurement standard deviation
6 NO_AKDIAG 1 time x latitude x altitude averaging kernel diagonal element
7 NO_APRIORI cm^{-3} time x latitude x altitude prior NO number density used in the retrieval
8 NO_NOEM cm^{-3} time x latitude x altitude NO number density as calculated by the NOEM model (Marsh et al., 2004)
9 temperature K time x latitude x altitude temperature calculated from NRLMSISE-00
10 TOT_DENS cm^{-3} time x latitude x altitude air number density calculated from NRLMSISE-00
11 NO_VMR ppb time x latitude x altitude NO volume mixing ratio using the NRLMSISE-00 number densities (= NO_DENS / TOT_DENS)
12 app_LST hours time x latitude apparent local solar time (equation of time corrected) at the mean altitude
13 mean_LST hours time x latitude mean local solar time at the mean altitude
14 mean_SZA degrees time x latitude mean solar zenith angle (at mean altitude)
15 UTC hours time x latitude UTC (fractional) hour of the day
16 utc_day cf. time time x latitude Day of the retrieved values in UTC
17 gm_lats degrees north time x latitude geomagnetic latitude calculated using the IGRF model
18 gm_lons degrees east time x latitude geomagnetic longitude calculated using the IGRF model
19 aacgm_gm_lats degrees north time x latitude geomagnetic latitude calculated using the AACGM model
20 aacgm_gm_lons degrees east time x latitude geomagnetic longitude calculated using the AACGM model