<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "The scaling method applied to HALO measurements: Inferring absolute trace gas concentrations from airborne limb spectroscopy under all sky conditions"^^ . "The novel HALO mini-DOAS instrument was developed for measurements of UV/vis/near-IR spectra of scattered\r\nskylight in limb and nadir geometry aboard the new research aircraft HALO. The absorptions of a suite\r\nof trace gases (O3, O4, NO2, CH2O, BrO, OClO, and others) are identified in the measured spectra using the\r\nDOAS-technique. Previously employed methods to infer absolute concentrations from DOAS measurements\r\nrely on a priori knowledge of aerosols and cloud cover. The recently developed scaling method promises to enable\r\nthe retrieval of target gas concentrations under all sky conditions. Effective light path lengths are estimated\r\nby employing a scaling gas, whose concentration at flight level is known, in conjunction with modelled profile\r\nshapes, radiative transfer calculations, and using the measured absorptions of the targeted species relative\r\nto those of the scaling gas. The present thesis describes the development and characterises the measurement\r\nproperties of the HALO mini-DOAS instrument. For the first time, random and systematic errors of the scaling\r\nmethod are thoroughly investigated. It is argued that random errors are 10 – 20% for most measurement conditions\r\nand that the scaling method is practically unperturbed by changing cloud cover if applied appropriately.\r\nIt is however shown that biases may occur if the assumed profile shapes are significantly different from actual\r\nprofile shapes. Retrieved mixing ratios of BrO and NO2 from measurements obtained during the science mission\r\nTACTS/ESMVal in August/September 2012 indicate that (a) no enhanced tropospheric BrO was detected\r\nin the mid-troposphere (3.5 – 9 km altitude) near the Antarctic continent (65° S) in spring (Sept. 13, 2012), (b)\r\nLMS and bottom polar vortex [BrO] agree with previous measurements, (c) other oxidants beside O3 influence\r\nNO oxidation in the UT/LS where [N2O] < 310 ppb, and (d) the same finding was confirmed for very low-NOx\r\nconditions, although the latter measurements are uncertain."^^ . "2017" . . . . . . . "Tilman"^^ . "Hüneke"^^ . "Tilman Hüneke"^^ . . . . . . "The scaling method applied to HALO measurements: Inferring absolute trace gas concentrations from airborne limb spectroscopy under all sky conditions (PDF)"^^ . . . "Diss_Hueneke_digital.pdf"^^ . . . "The scaling method applied to HALO measurements: Inferring absolute trace gas concentrations from airborne limb spectroscopy under all sky conditions (Other)"^^ . . . . . . "small.jpg"^^ . . . "The scaling method applied to HALO measurements: Inferring absolute trace gas concentrations from airborne limb spectroscopy under all sky conditions (Other)"^^ . . . . . . "medium.jpg"^^ . . . "The scaling method applied to HALO measurements: Inferring absolute trace gas concentrations from airborne limb spectroscopy under all sky conditions (Other)"^^ . . . . . . "preview.jpg"^^ . . . "The scaling method applied to HALO measurements: Inferring absolute trace gas concentrations from airborne limb spectroscopy under all sky conditions (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "The scaling method applied to HALO measurements: Inferring absolute trace gas concentrations from airborne limb spectroscopy under all sky conditions (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #22573 \n\nThe scaling method applied to HALO measurements: Inferring absolute trace gas concentrations from airborne limb spectroscopy under all sky conditions\n\n" . "text/html" . . . "500 Naturwissenschaften und Mathematik"@de . "500 Natural sciences and mathematics"@en . . . "550 Geowissenschaften"@de . "550 Earth sciences"@en . .