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Retrieval (focus on chemistry)

Retrieval of altitude profiles of atmospheric parameters from GLORIA chemistry-mode (CM) limb-radiance spectra is performed with the retrieval tool KOPRAFIT developed at Karlsruhe Institute of Technology (KIT). The kernel of KOPRAFIT is the fast line-by-line radiative transfer algorithm KOPRA (Stiller , 2000). KOPRAFIT is the standard tool at KIT-IMK applied for the retrieval of altitude profiles from balloon and aircraft measurements (e.g. Woiwode et al., 2012).

The standard retrieval of GLORIA CM data concerns line-of-sight correction (LOS), temperature, O3, HNO3, ClONO2, H2O, CH4, N2O, CFC-11, CFC-12 and PAN. Due to the high spectral resolution, the measurements enable also analysis of such challenging gases as e.g. HCN, C2H4, C2H6, HCOOH, H2CO, SF6 or ClO and therefore provide information on biomass burning, monsoon outflows, air age and polar chemistry.

Figure 1:

As an example of GLORIA chemistry-mode retrieval, temperature measured during one of the TACTS/ESMVAL campaign flights is presented in Figure 1. The retrieval result of the horizontal flight part is plotted in the top left panel. The corresponding initial guess data set based on the ECMWF data and implemented in the calculations is given in the top right panel. The black areas indicate clouds or altitudes above the flight track. The lower panels show the error due to spectral noise (left) and the vertical resolution of the retrieval (right).

Stiller, G. P., editor (2000). The Karlsruhe Optimized and Precise Radiative Transfer Algorithm (KOPRA), volume FZKA 6487 of Wissenschaftliche Berichte. Forschungszentrum Karlsruhe.

Woiwode, W., Oelhaf, H., Gulde, T., Piesch, C., Maucher, G., Ebersoldt, A., Keim, C., Höpfner, M., Khaykin, S., Ravegnani, F., Ulanovsky, A. E., Volk, C. M., Hösen, E., Dörnbrack, A., Ungermann, J., Kalicinsky, C., and Orphal, J. (2012). MIPAS-STR measurements in the Arctic UTLS in winter/spring 2010: instrument characterization, retrieval and validation. Atmos. Meas. Tech., 5(6):1205–1228.