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New retrieval approach to tropospheric NO₂ by synergistic inversion of satellite NADIR DOAS soundings and ground-based FTIR measurements
| Content Provider | Semantic Scholar |
|---|---|
| Author | Sussmann, Ralf Stremme, Wolfgang Burrows, John P. Richter, Andreas Seiler, W. Rettinger, Markus |
| Copyright Year | 2006 |
| Abstract | Columnar NO2 from FTIR measurements at the Zugspitze (47.42 °N, 10.98 °E, 2964 m asl.) were used synergistically with SCIAMACHY satellite data (Univ. Bremen algorithm UB1.5). A new concept to match FTIR data to the time of satellite overpass makes use of the NO2 daytime increasing rate retrieved from the FTIR data set itself [+1.02(6)E+14 cm/h]. SCIAMACHY data within a 200-km selection radius around Zugspitze were considered, and a pollution-clearing scheme was developed to select only pixels corresponding to clean background (free) tropospheric conditions. Analysis of the averaging kernels gives proof that a high-mountain-site FTIR is a highly accurate measure for the stratospheric column, while SCIAMACHY shows significant tropospheric sensitivity. Based on this, we set up a combined FTIR-SCIAMACHY retrieval for NO2 which delivers two independent pieces of information for troposphere and stratosphere, respectively (Fig. 1a). It yields an annual cycle of the background (free) tropospheric column between 0.75-1.54E+15 cm, and an intermediate phase between that known for boundary layer and stratosphere, respectively (Fig. 1b). |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://publikationen.bibliothek.kit.edu/230066646/3814895 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
