Aerosol column burden* | 2 - very high | Cloud sensitive.. Daylight only. | UV (for absorbing aerosol) and VIS spectrometry |
Aerosol effective radius | 2 - very high | Cloud sensitive.. Daylight only. | UV (for absorbing aerosol) and VIS spectrometry |
Aerosol mass mixing ratio | 2 - very high | Cloud sensitive.. Daylight only. | UV (for absorbing aerosol) and VIS spectrometry |
Aerosol Optical Depth* | 2 - very high | Cloud sensitive.. Daylight only. | UV (for absorbing aerosol) and VIS spectrometry |
Aerosol type | 2 - very high | Cloud sensitive.. Daylight only. | UV (for absorbing aerosol) and VIS spectrometry |
BrO* | 1 - primary | Cloud sensitive.. Daylight only. | UV spectrometry. BrO lines around 300 nm. Frequent sampling (GEO) enables monitoring diurnal variations |
HCHO* | 1 - primary | Cloud sensitive.. Daylight only. | UV spectrometry. HCHO lines around 350 nm. Frequent sampling (GEO) enables monitoring diurnal variations |
HCHO Total Column* | 1 - primary | Cloud sensitive.. Daylight only. | UV spectrometry. HCHO lines around 350 nm. Frequent sampling (GEO) enables monitoring diurnal variations |
CH3Br* | 3 - high | Cloud sensitive.. Daylight only. | Spectrometry in the HC3Br band from 200 to 250 nm |
ClO* | 1 - primary | Cloud sensitive.. Daylight only. | UV Spectrometry. ClO lines around 300 nm Frequent sampling (GEO) enables monitoring diurnal variations |
Cloud cover | 5 - marginal | Daylight only. | VIS spectroscopy |
Cloud optical depth | 5 - marginal | Low-density cloud only.. Daylight only. | VIS spectrometry |
Earth surface short-wave bidirectional reflectance | 5 - marginal | Cloud sensitive. | VIS spectrometry. GEO sees changing solar incidence angles as daylight progresses |
H2O* | 3 - high | Cloud sensitive.. Daylight only. | UV and VIS spectrometry. Several weak bands. Frequent sampling (GEO) enables monitoring diurnal variations |
NO* | 1 - primary | Cloud sensitive.. Daylight only. | UV spectrometry. NO lines around 250 nm. Frequent sampling (GEO) enables monitoring diurnal variations |
NO2* | 1 - primary | Cloud sensitive.. Daylight only. | UV and VIS spectrometry. Several lines in the ranges around 220 nm and 400 nm |
NO2 Total Column* | 1 - primary | Cloud sensitive.. Daylight only. | UV and VIS spectrometry. Several NO2 lines. Frequent sampling (GEO) enables monitoring diurnal variations |
O3* | 2 - very high | Cloud sensitive.. Daylight only. | UV and VIS spectrometry. Ozone lines in the bands around 260 nm (Hartley) and/or 340 nm (Huggins) and 600 nm (Chappuis). GEO enabling frequent sampling (GEO) for diurnal variations |
O3 Total Column* | 2 - very high | Cloud sensitive.. Daylight only. | UV and VIS spectrometry. Ozone lines in the bands around 260 nm (Hartley) and/or 340 nm (Huggins) and 600 nm (Chappuis). GEO enabling frequent sampling (GEO) for diurnal variations |
PSC occurrence | 2 - very high | Marginal view from GEO.. Daylight only. | UV and VIS spectrometry |
SO2* | 1 - primary | Cloud sensitive.. Daylight only. | UV spectrometry. SO2 lines around 350 nm. Frequent sampling (GEO) for sources monitoring |
SO2 Total Column* | 1 - primary | Cloud sensitive.. Daylight only. | UV spectrometry. SO2 lines around 350 nm. Frequent sampling (GEO) for sources monitoring |
Upward short-wave irradiance at TOA | 3 - high | Spectral interpolation needed.. Information on BRDF needed. | UV and VIS spectrometry |
Upward spectral radiance at TOA | 5 - marginal | Missing NIR, SWIR and all Long-waves. | UV and VIS spectrometry |
Aerosol volcanic ash | 2 - very high | Cloud sensitive.. Daylight only. | UV (specifically sensitive to ash) and VIS spectrometry |
Aerosol volcanic ash Total Column | 2 - very high | Cloud sensitive.. Daylight only. | UV (specifically sensitive to ash) and VIS spectrometry. Frequent sampling (GEO) for early detection of ash plumes |