An innovative balloonborne microjoule lidar (MULID) has been developed within the framework of th... more An innovative balloonborne microjoule lidar (MULID) has been developed within the framework of the HIBISCUS project to provide nighttime measurements of visible and subvisible cirrus and aerosols. MULID has been designed to be a low-cost and an ultralow consumption instrument, due to the remote possibilities of payload recovery and the necessity of a low-weight battery power supply. Ground tests have been performed at the Observatory of Haute Provence (France), and the first technical flight has been made from Trapani, Italy, on a stratospheric balloon; finally, the instrument has been scientifically deployed during the pre-HIBISCUS and HIBISCUS tropical campaigns in Bauru, Brazil, in February 2003 and February 2004, respectively. A description of the instrument is provided together with the results of the ground-based and flight tests as well as an overview and discussion of the first results.
The pointwise meteorological observations of the Viking Lander and Mars Pathfinder as well as the... more The pointwise meteorological observations of the Viking Lander and Mars Pathfinder as well as the orbital mapping and sounding performed by, e.g., Mariner 9, Viking Orbiters and the Mars Global Surveyor have given a good understanding of the basic behaviour of the Martian atmosphere. However, the more detailed characterisation of the Martian circulation patterns, boundary layer phenomena and climatological cycles
The scientific objectives of a meterological experiment on the Martian surface are defined, and t... more The scientific objectives of a meterological experiment on the Martian surface are defined, and the meteorological equipment of the landing elements of the Mars-96 mission are described with emphasis on the applicability for re-use in forthcoming Mars missions. The general strategy for atmospheric surface observations is discussed. Meteorological surface observations are of utmost value in studying the Martian atmosphere. The
The occurrence of fast deep convective overshooting up to 450 K or 60 hPa over land in the tropic... more The occurrence of fast deep convective overshooting up to 450 K or 60 hPa over land in the tropical lower stratosphere and its impact on the thermal structure, the composition and the water vapour systematically reported during recent field observations in Brazil, Australia and Africa, is now generally accepted. However, though successfully captured by meso-scale cloud resolving model simulations, the
In preparation of a future HIBISCUS project, several MIR long duration balloon flights have been ... more In preparation of a future HIBISCUS project, several MIR long duration balloon flights have been performed from Brazil during the austral summer of 2000-01. Asides from technical achievements described in another presentation, those first exploratory flights carrying all meteorological sensors and for one of them a UV- Visible spectrometer for O3 and NO2 profile measurement by remote sensing, have shown
Ozone total columns are regularly measured from the ground by SAOZ uv-visible spectrometers. Maki... more Ozone total columns are regularly measured from the ground by SAOZ uv-visible spectrometers. Making use of a 3D transport model to remove the dynamical component in the ozone variations, total column chemical loss have been derived each winter since 1993. According to this evaluation, the total ozone reduction in 2000 started during the second week of January and extended until
The ozone loss has been evaluated each winter since 1994 by comparing experimental data sets - to... more The ozone loss has been evaluated each winter since 1994 by comparing experimental data sets - total ozone from the SAOZ ground-based network and profiles from the SAOZ balloon and POAM satellite borne instruments - to passive ozone simulations from two 3-D CTM models REPROBUS and SLIMCAT. The results show the high variability of column reduction in Arctic, varying from
An innovative balloonborne microjoule lidar (MULID) has been developed within the framework of th... more An innovative balloonborne microjoule lidar (MULID) has been developed within the framework of the HIBISCUS project to provide nighttime measurements of visible and subvisible cirrus and aerosols. MULID has been designed to be a low-cost and an ultralow consumption instrument, due to the remote possibilities of payload recovery and the necessity of a low-weight battery power supply. Ground tests have been performed at the Observatory of Haute Provence (France), and the first technical flight has been made from Trapani, Italy, on a stratospheric balloon; finally, the instrument has been scientifically deployed during the pre-HIBISCUS and HIBISCUS tropical campaigns in Bauru, Brazil, in February 2003 and February 2004, respectively. A description of the instrument is provided together with the results of the ground-based and flight tests as well as an overview and discussion of the first results.
The pointwise meteorological observations of the Viking Lander and Mars Pathfinder as well as the... more The pointwise meteorological observations of the Viking Lander and Mars Pathfinder as well as the orbital mapping and sounding performed by, e.g., Mariner 9, Viking Orbiters and the Mars Global Surveyor have given a good understanding of the basic behaviour of the Martian atmosphere. However, the more detailed characterisation of the Martian circulation patterns, boundary layer phenomena and climatological cycles
The scientific objectives of a meterological experiment on the Martian surface are defined, and t... more The scientific objectives of a meterological experiment on the Martian surface are defined, and the meteorological equipment of the landing elements of the Mars-96 mission are described with emphasis on the applicability for re-use in forthcoming Mars missions. The general strategy for atmospheric surface observations is discussed. Meteorological surface observations are of utmost value in studying the Martian atmosphere. The
The occurrence of fast deep convective overshooting up to 450 K or 60 hPa over land in the tropic... more The occurrence of fast deep convective overshooting up to 450 K or 60 hPa over land in the tropical lower stratosphere and its impact on the thermal structure, the composition and the water vapour systematically reported during recent field observations in Brazil, Australia and Africa, is now generally accepted. However, though successfully captured by meso-scale cloud resolving model simulations, the
In preparation of a future HIBISCUS project, several MIR long duration balloon flights have been ... more In preparation of a future HIBISCUS project, several MIR long duration balloon flights have been performed from Brazil during the austral summer of 2000-01. Asides from technical achievements described in another presentation, those first exploratory flights carrying all meteorological sensors and for one of them a UV- Visible spectrometer for O3 and NO2 profile measurement by remote sensing, have shown
Ozone total columns are regularly measured from the ground by SAOZ uv-visible spectrometers. Maki... more Ozone total columns are regularly measured from the ground by SAOZ uv-visible spectrometers. Making use of a 3D transport model to remove the dynamical component in the ozone variations, total column chemical loss have been derived each winter since 1993. According to this evaluation, the total ozone reduction in 2000 started during the second week of January and extended until
The ozone loss has been evaluated each winter since 1994 by comparing experimental data sets - to... more The ozone loss has been evaluated each winter since 1994 by comparing experimental data sets - total ozone from the SAOZ ground-based network and profiles from the SAOZ balloon and POAM satellite borne instruments - to passive ozone simulations from two 3-D CTM models REPROBUS and SLIMCAT. The results show the high variability of column reduction in Arctic, varying from
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Papers by J. Pommereau