Person

Bertrand Calpini

This person is no longer with EPFL

Related publications (43)

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A new lidar for the measurement of tropospheric ozone is proposed, based on the differential analysis of the Raman backscattered signals on nitrogen and oxygen, which is far less sensitive to the aerosols than the classical DIAL system. Using a third Raman ...

1999

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A new way of measuring ozone and water vapor in the Planetary Boundary Layer (PBL) is proposed. The method is based on the simultaneous measurement of the Raman backscattering in the UV by O2, N2 and H2O, using a single pump beam at 266 nm. The ozone conce ...

1999

In-situ OH kinetics study providing an indicator for ozone formation limitation

Hubert van den Bergh, Bertrand Calpini, Alain Clappier

Hydroxyl radicals dominate daytime tropospheric chem., responsible for reactive removal of most trace gases (e.g., volatile org. compds.[VOC]), and is an active participant in the NO and NO2 cycle. Pump-and-probe LIDAR was used to examine the OH- chem. in ...

1999

Direct measurement of the total reaction rate of OH in the atmosphere

Hubert van den Bergh, Bertrand Calpini, Alain Clappier

A new method to investigate atmospheric chemical kinetics is presented. It is based on the pump and probe principle. Preliminary measurements are described on the decay rate of OH in the planetary boundary layer its concentration has been raised by laser f ...

1999

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Different remote sensing techniques have been used for the analysis of the air pollution in the Milan area. Results and intercomparisons from two lidars are presented, obtained from a ground based and an airborne instrument. Combining them with range resol ...

1999

Photo-oxidant formation in the Milan metropolitan area

Hubert van den Bergh, Bertrand Calpini, Valentin Simeonov, Alain Clappier, Gilles Larchevêque

During the Limitation of Oxidant Prodn. (LOOP) campaign, different instruments were deployed, providing a complete data set. This will be used to evaluate the model and its ability to reproduce pollution events. Then, the complete data set will be used for ...

1999

Measurements of local air pollution and road traffic were taken during a period of one month before and after the opening of a road tunnel to the public in nearby Sachseln, a small city located in a rural region (Obwald) at the center of Switzerland. Two 5 ...

1999

Tropospheric ozone measurements over the great Athens area during the MEDCAPHOT-TRACE campaign with a new shot-per-shot dial instrument: experimental system and results

Hubert van den Bergh, Bertrand Calpini

Within the MEDCAPHOT-TRACE program of the European Community for studying the photochem. air pollution over the Great Athens Area, we report on 3-D lidar measurements of tropospheric ozone. After a general presentation of the DIAL technique, the exptl. lay ...

1998

Role of urban and suburban aerosols on solar UV radiation over Athens, Greece

Hubert van den Bergh, Bertrand Calpini

The scope of this paper is to provide an exptl. and modeling contribution on the role of suspended lower tropospheric particles to the UV spectral irradiance reaching the ground in urban environments. The UV spectral irradiance was measured with a UV spect ...

1998

Raman frequency shifting in a CH4:H2:Ar mixture pumped by the fourth harmonic of a Nd:YAG laser

Hubert van den Bergh, Bertrand Calpini, Valentin Simeonov, Valentin Mitev

Mixts. of methane, H, and Ar (CH4:H2:Ar) were studied as UV Raman shifters for ozone differential absorption lidar application. They have higher photochem. stability than pure CH4 and the capability to produce, with high enough efficiency, either 1st CH4 S ...

1998