This contribution has been concerned with three different activities. First, global N02 data records from HALOE, POAM-II and POAM-III satellite instruments complemented by ground-based data sets from the NDSC, have been investigated for mutual consistency and exploited to build a global time-latitude stratospheric NO2 profile climatology that may be used for tropospheric NO2 retrieval from ERS2-G0ME. Second, a BrO total column product derived from GOME has been created over the total present lifetime of the ERS-2 satellite (1996 to 2002) and made available to the scientific community through a dedicated web site. In addition, a prototype improved GOME BrO retrieval algorithm has been designed with the aim to determine better global tropospheric BrO columns from the combined use of GOME data and three-dimensional model data, and to provide the stratospheric reference needed in a tropospheric residual approach. Third, ground-based multi-axis DOAS measurements have been conducted at the Observatoire de Haute Provence, (OHP, 44 °N) between January 2001 and June 2002 in support of satellite retrieval activities. Results obtained demonstrate the high sensitivity of the measurements to tropospheric amounts of NO2 and HCHO, as well as the potential of the technique to unravel small mid-latitude free-tropospheric BrO contents. As to the latter point, comparisons between combined GOME-SLIMCAT and MAX-DOAS tropospheric BrO evaluations suggest that approximately half of the mid-latitude BrO total column resides in the troposphere.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Retrieval of Tropospheric BrO and NO2 from UV-Visible Observations
Michel Van Roozendael
- Springer Berlin Heidelberg