Application d'un radar profileur de vent UHF à l'étude de la couche limite atmosphérique

TOULOUSE3-BU Sciences (315552104) / SudocTOULOUSE-Observ. Midi Pyréné (315552299) / SudocSudocFranceF

Multi-scale time dependent correlation between synchronous measurements of ground-level ozone and meteorological parameters in the Caribbean Basin

International audienc

Effect of Leachate Recirculation on Landfill Methane Production in a Tropical Insular Area

International audienc

In situ quantification and tracking of volatile organic compounds with a portable mass spectrometer in tropical waste and urban sites

International audienc

Remote sensing and surface observations of the response of the atmospheric boundary layer to a solar eclipse

On 11 August 1999, a near-total solar eclipse (80%) was observed in Campistrous, France. The influence of this particular event on the atmospheric boundary layer was observed with a UHF-RASS radar, a sodar and an instrumented mast. The changes in turbulence intensity, radar reflectivity, and temperature on the radiative budget are described in relation to collocated ground meteorological data. The impact of the eclipse induces a clear response of the atmosphere, with a time lag of 15 to 30 min, perceptible in several mean and turbulent meteorological variables up to the top of the atmospheric boundary layer

Impact of a new Legislation on Volatile Organic Compounds Emissions in an Open Landfill in Tropical Insular Climate

International audienc

Assessment of nitrogen oxides and ground-level ozone behavior in a dense air quality station network: Case study in the Lesser Antilles Arc

International audienc

Reply to 'Comments on "Comparison of rafar reflectivity and vertical velocity observed with a scannable c-band doppler radar and two UHF profilers in the lower troposphere"'

The objective of Lothon et al.'s (2002, hereafter L2002) paper was to investigate the ability of a scannable C-band Doppler meteorological radar for the documentation of the lower clear atmosphere with an emphasis on the atmospheric boundary layer (ABL). Comparison with the observations of two UHF wind profilers provided the opportunity to address the problem of the so-called downward bias of UHF vertical velocity measurements made in a fully developed and turbulent convective ABL previously put in evidence and described by Angevine (1997). Worthington's (2003) reproach of a too-narrow review of the different aspects of this problem is valid, but a thorough survey of this question was beyond the scope of the paper. The ambition of the authors was to bring some elements of discussion to this open debate—elements that tend to confirm Angevine's conclusion on the existence of UHF downward bias of instrumental origin.In the reply presented in the following section we discuss Worthington's (2003) suggestion of the possible meteorological origin of the UHF vertical velocity bias observed in the ABL. Coming back to certain arguments developed previously in L2002, the importance of which seems underestimated in Worthington's comment, and with new data analysis, we reinforce our position on a most probable instrumental origin of the UHF vertical bias

Use of the Doppler spectral with to improve the estimation of the convective boundary layer height from UHF wind Profiler observations

Enhancement of the air refractive index structure parameter C2n often occurs at the top of the convective boundary layer (CBL), where the absolute values of the vertical gradients of virtual potential temperature and mixing ratio have a peak. This well-known behavior of the C2n profiles is often used to locate the height of the mixed layer Zi from UHF wind profiler observations. In the present study, Zi determination with the C2n-based technique was investigated for a case of clear-air CBL and a case of cloud-topped CBL. In certain circumstances, such as multifold C2n peaks or poorly defined peaks, these techniques fail to correctly retrieve CBL height. In order to improve Zi determination, a new method based on the conjoint use of C2n and Doppler spectral width profiles is proposed and discussed

Use of the Doppler spectral with to improve the estimation of the convective boundary layer height from UHF wind Profiler observations

Enhancement of the air refractive index structure parameter C2n often occurs at the top of the convective boundary layer (CBL), where the absolute values of the vertical gradients of virtual potential temperature and mixing ratio have a peak. This well-known behavior of the C2n profiles is often used to locate the height of the mixed layer Zi from UHF wind profiler observations. In the present study, Zi determination with the C2n-based technique was investigated for a case of clear-air CBL and a case of cloud-topped CBL. In certain circumstances, such as multifold C2n peaks or poorly defined peaks, these techniques fail to correctly retrieve CBL height. In order to improve Zi determination, a new method based on the conjoint use of C2n and Doppler spectral width profiles is proposed and discussed