Prof. Niklaus A. Kämpfer Profile

Prof. Niklaus A. Kämpfer

at Univ Bern

SPIE Involvement:

Author

Publications (10)

SPIE Journal Paper | 23 April 2015

Introduction to the Maïdo Lidar Calibration Campaign dedicated to the validation of upper air meteorological parameters

Philippe Keckhut, Yann Courcoux, Jean-Luc Baray, Jacques Porteneuve, Hélène Vérèmes, Alain Hauchecorne, Davide Dionisi, Françoise Posny, Jean-Pierre Cammas, Guillaume Payen, Franck Gabarrot, Stephanie Evan, Sergey Khaykin, Rolf Rüfenacht, Brigitte Tschanz, Niklaus Kämpfer, Philippe Ricaud, Abdel Abchiche, Jimmy Leclair-de-Bellevue, Valentin Duflot

JARS, Vol. 9, Issue 01, 094099, (April 2015) https://doi.org/10.1117/12.10.1117/1.JRS.9.094099

KEYWORDS: LIDAR, Calibration, Clouds, Temperature metrology, Observatories, Microwave radiation, Satellites, Ozone, Wind measurement, Global Positioning System

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The first operations at the new High-altitude Maïdo Observatory at La Réunion began in 2013. The Maïdo Lidar Calibration Campaign (MALICCA) was organized there in April 2013 and has focused on the validation of the thermodynamic parameters (temperature, water vapor, and wind) measured with many instruments including the new very large lidar for water vapor and temperature profiles. The aim of this publication consists of providing an overview of the different instruments deployed during this campaign and their status, some of the targeted scientific questions and associated instrumental issues. Some specific detailed studies for some individual techniques were addressed elsewhere. This study shows that temperature profiles were obtained from the ground to the mesopause (80 km) thanks to the lidar and regular meteorological balloon-borne sondes with an overlap range showing good agreement. Water vapor is also monitored from the ground to the mesopause by using the Raman lidar and microwave techniques. Both techniques need to be pushed to their limit to reduce the missing range in the lower stratosphere. Total columns obtained from global positioning system or spectrometers are valuable for checking the calibration and ensuring vertical continuity. The lidar can also provide the vertical cloud structure that is a valuable complementary piece of information when investigating the water vapor cycle. Finally, wind vertical profiles, which were obtained from sondes, are now also retrieved at Maïdo from the newly implemented microwave technique and the lidar. Stable calibrations as well as a small-scale dynamical structure are required to monitor the thermodynamic state of the middle atmosphere, ensure validation of satellite sensors, study the transport of water vapor in the vicinity of the tropical tropopause and study their link with cirrus clouds and cyclones and the impact of small-scale dynamics (gravity waves) and their link with the mean state of the mesosphere.

Proceedings Article | 29 October 2010 Paper

Monitoring middle-atmospheric water vapor over Seoul by using a 22 GHz ground-based radiometer SWARA

Soohyun Ka, Evelyn de Wachter, Niklaus Kaempfer, Jung Jin Oh

Proceedings Volume 7859, 78590K (2010) https://doi.org/10.1117/12.869501

KEYWORDS: Calibration, Antennas, Radiometry, Microwave radiation, Atmospheric monitoring, Climate change, Sensors, Atmospheric sensing, Radiative transfer, Opacity

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Proceedings Article | 1 November 2005 Paper

A novel spectrometer concept for microwave remote sensing of middle atmospheric trace constituents

Stefan Müller, Niklaus Kämpfer, Christian Monstein, Hansueli Meyer, Axel Murk, Vladimir Vasic

Proceedings Volume 5979, 59790X (2005) https://doi.org/10.1117/12.627655

KEYWORDS: Spectroscopy, Adaptive optics, Ozone, Radiometry, Atmospheric sensing, Field programmable gate arrays, Optical filters, Signal processing, Calibration, Microwave remote sensing

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Proceedings Article | 16 February 2004 Paper

Calibration of a 22-GHz radiometer for middle-atmospheric water vapor measurements: a non-common approach

Beat Deuber, Dietrich Feist, Niklaus Kampfer

Proceedings Volume 5235, (2004) https://doi.org/10.1117/12.514186

KEYWORDS: Calibration, Reflection, Spectrometers, Temperature metrology, Radiometry, Atmospheric physics, Stratosphere, Troposphere, Liquids, Nitrogen

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Proceedings Article | 19 August 1998 Paper

BEAM: a fast versatile model for atmospheric absorption coefficients from 0 to 1000 GHz

Dietrich Feist, Niklaus Kaempfer

Proceedings Volume 3503, (1998) https://doi.org/10.1117/12.319494

KEYWORDS: Atmospheric modeling, Absorption, Microwave radiation, Atmospheric propagation, Molecules, Databases, Wave propagation, Gases, Data modeling, Radiative transfer

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Proceedings Article | 19 August 1998 Paper

EMCOR radiometer: calibration and first tests

Doris Maier, Niklaus Kaempfer, W. Amacher, M. Wuethrich, J. de la Noe, P. Ricaud, P. Baron, Gerard Beaudin, C. Viguerie, J.-R. Pardo, Juan Gallego-Puyol, Alberto Barcia, J. Cernicharo, Brian Ellison, Richard Siddans, David Matheson, Klaus Kuenzi, U. Klein, B. Franke, J. Louhi, J. Mallat, M. Gustafsson, A. Raeisaenen, Alexandre Karpov

Proceedings Volume 3503, (1998) https://doi.org/10.1117/12.319495

KEYWORDS: Calibration, Mirrors, Opacity, Dielectrics, Switches, Radiometry, Receivers, Amplifiers, Atmospheric optics, Electronic filtering

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Proceedings Article | 1 January 1997 Paper

Retrieval method for upper-tropospheric water vapor profiles from shuttle-borne microwave measurements

Dietrich Feist, Reto Peter, Niklaus Kaempfer

Proceedings Volume 3220, (1997) https://doi.org/10.1117/12.301152

KEYWORDS: Microwave radiation, Data modeling, Troposphere, Climatology, Clouds, Humidity, Extremely high frequency, Earth's atmosphere, Gases, Stratosphere

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SPIE Journal Paper | 1 August 1995

Microwave remote sensing of the atmosphere in Switzerland

Niklaus Kaempfer

OE, Vol. 34, Issue 08, (August 1995) https://doi.org/10.1117/12.10.1117/12.205666

KEYWORDS: Atmospheric physics, Microwave remote sensing, Atmospheric sensing, Microwave radiometry, Chemical reactions, Ozone, Applied physics, Sensors, Aerospace engineering

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Proceedings Article | 1 September 1991 Paper

Ground-based microwave radiometry of ozone

Niklaus Kaempfer, P. Bodenmann, Reto Peter

Proceedings Volume 1491, (1991) https://doi.org/10.1117/12.46672

KEYWORDS: Ozone, Temperature metrology, Microwave radiation, Radiometry, Microwave radiometry, Atmospheric sensing, Remote sensing, Atmospheric chemistry, Solids, Troposphere

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Proceedings Article | 1 September 1991 Paper

High-resolution multichannel mm-wave radiometer for the detection of stratospheric ClO

Louis Gerber, Niklaus Kaempfer

Proceedings Volume 1491, (1991) https://doi.org/10.1117/12.46664

KEYWORDS: Radiometry, Calibration, Switches, Remote sensing, Atmospheric chemistry, Ozone, Extremely high frequency, Chlorine, Atmospheric modeling, Atmospheric sensing

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Showing 5 of 10 publications

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