First middle-atmospheric zonal wind profile measurements with a new ground-based microwave Doppler-spectro-radiometer Atmospheric Measurement Techniques DOI 10.5194/amt-5-2647-2012 7 November 2012 We report on the wind radiometer WIRA, a new ground-based microwave Doppler-spectro-radiometer specifically designed for the measurement of middle-atmospheric horizontal wind by observing ozone emission spectra at 142.17504 GHz. Read more
Combined wind measurements by two different lidar instruments in the Arctic middle atmosphere Atmospheric Measurement Techniques DOI 10.5194/amt-5-2433-2012 19 October 2012 The comparison of winds derived by RMR and sodium lidar is excellent for long integration times of 10 h as well as shorter ones of 1 h. Combination of data from both lidars allows identifying wavy structures between 30 and 110 km altitude, whose amplitudes increase with height. Read more
The scientific basis for a satellite mission to retrieve CCN concentrations and their impacts on convective clouds Atmospheric Measurement Techniques DOI 10.5194/amt-5-2039-2012 23 August 2012 The cloud-mediated aerosol radiative forcing is widely recognized as the main source of uncertainty in our knowledge of the anthropogenic forcing on climate. Here, we present a new conceptual framework to help us overcome the challenges for improving our understanding, using relatively simple passive satellite measurements in the visible and infared (IR). CCN concentrations and their impacts on convective clouds">Read more
Aerosol information content analysis of multi-angle high spectral resolution measurements and its benefit for high accuracy greenhouse gas retrievals Atmospheric Measurement Techniques DOI 10.5194/amt-5-1809-2012 27 July 2012 In this paper, we investigate the combined aerosol and greenhouse gas retrieval using multiple satellite viewing angles simultaneously. We find that this method greatly enhances the ability to retrieve aerosol properties by 2–3 degrees of freedom. Read more
Comparison of OH concentration measurements by DOAS and LIF during SAPHIR chamber experiments at high OH reactivity and low NO concentration Atmospheric Measurement Techniques DOI 10.5194/amt-5-1611-2012 11 July 2012 During recent field campaigns, hydroxyl radical (OH) concentrations that were measured by laser-induced fluorescence (LIF) were up to a factor of ten larger than predicted by current chemical models for conditions of high OH reactivity and low NO concentration. These discrepancies, which were observed in forests and urban-influenced rural environments, are so far not entirely understood. DOAS and LIF during SAPHIR chamber experiments at high OH reactivity and low NO concentration">Read more
