Marilyn Schneider

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Within the framework of the NDSC (Network for the Detection of Stratospheric Change) ground-based FTIR solar absorption spectra have been routinely recorded at Izaña Observatory (28 • N, 16 • W) on Tenerife Island since March 1999. By analyzing the shape of the absorption lines, and their different temperature sensitivities, the vertical distribution of the(More)
Within this ENVISAT validation project [AO-191] ground-based measurements of different techniques have been performed at Kiruna in the Arctic and on Tenerife Island in the subtropics. These ground-based data were used to validate column amounts derived from SCIAMACHY as well as profiles from MIPAS. While SCIAMACHY O 3 columns of versions up to 3.53 differ(More)
This paper presents extensive validation analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. 5 The ACE satellite instruments(More)
The sensitivity of ground-based instruments measuring in the infrared with respect to tropospheric water vapour content is generally limited to the lower and middle troposphere. The large vertical gradients and variabili-ties avoid a better sensitivity for the upper troposphere/lower stratosphere (UT/LS) region. In this work an optimised retrieval is(More)
Carbon monoxide total column amounts in the atmosphere have been measured in the High Northern Hemisphere (30 • –90 • N, HNH) between January 2002 and December 2003, based on the analysis of infrared solar spectra recorded with spectrometers of high and moderate resolution. They are compared to ground-level CO mixing ratios 5 and to total column amounts(More)
The diffuse gamma radiation arising from the interaction of cosmic ray particles with matter and radiation in the Galaxy is one of the few probes available to study the origin of the cosmic rays. Milagro is a water Cherenkov detector that continuously views the entire overhead sky. The large field-of-view combined with the long observation time makes(More)
For the ENVISAT validation different ground-based techniques have been used. MIPAS O 3 profiles have been compared with data from different ground-based techniques such as FTIR, LIDAR, O 3 sondes, and MWR. All instruments used are operated within the NDSC (Network for the Detection of Stratospheric Change). These comparisons covering different techniques as(More)
The abundance of chlorine in the Earth's atmosphere increased considerably during the 1970s to 1990s, following large emissions of anthropogenic long-lived chlorine-containing source gases, notably the chlorofluorocarbons. The chemical inertness of chlorofluorocarbons allows their transport and mixing throughout the troposphere on a global scale, before(More)
The Milagrito water Cherenkov detector near Los Alamos, New Mexico, operated as a sky monitor at energies of a few TeV between February 1997 and May 1998 including the period of the strong, long-lasting 1997 are of Markarian 501. Milagrito served as a test run for the full Milagro detector. An event excess with a signiicance of 3:7 from Markarian 501 was(More)