Céline Cornet - Academia.edu (original) (raw)

Papers by Céline Cornet

Journal of Quantitative Spectroscopy & Radiative Transfer, Nov 1, 2017

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights  Heterogeneous cirrus clouds are generated.  Lidar signals are simulated using a Monte-Carlo code.  Effects on CALIOP lidar measured data are evaluated.

Atmospheric Measurement Techniques, Jun 28, 2023

provides the possibility to estimate uncertainties of different sources. Three types of errors we... more provides the possibility to estimate uncertainties of different sources. Three types of errors were evaluated: (1) errors related to measurement uncertainties, which reach 6 % and 12 % for COT and R eff , respectively, (2) errors related to an incorrect estimation of the ancillary data that remain below 0.5 %, and (3) errors related to the simplified cloud physical model assuming independent pixel approximation. We show that not considering the in-cloud heterogeneous vertical profiles and the 3D radiative transfer effects leads to an average uncertainty of 5 % and 4 % for COT and 13 % and 9 % for R eff .

2014 AGU Fall Meeting, Dec 15, 2014

AGU Fall Meeting Abstracts, Dec 1, 2019

AGU Fall Meeting Abstracts, Dec 1, 2008

We are revisiting here the use of multidirectionnal observations of cloud polarized reflectances ... more We are revisiting here the use of multidirectionnal observations of cloud polarized reflectances in the backscatter direction for liquid clouds microphysical properties retrieval. Cloud glories and cloud bows observations have a long record and have been theoretically and thoroughly investigated by numerous authors. Multiangle polarization measurements over liquid clouds have demonstrated a clear potential for inferring cloud effective radius and

AGU Fall Meeting Abstracts, Dec 1, 2016

AGU Fall Meeting Abstracts, Dec 1, 2018

HAL (Le Centre pour la Communication Scientifique Directe), Nov 13, 2013

AGU Fall Meeting Abstracts, Dec 1, 2017

Springer eBooks, 2010

ABSTRACT In the near future, more and more spaceborne or airborne instruments will be able to mea... more ABSTRACT In the near future, more and more spaceborne or airborne instruments will be able to measure polarized reflectance issued from the atmosphere. To give some examples, currently, the POLarization and Directionality of the Earth’s Reflectance instrument POLDER3/ PARASOL, which is the successor of POLDER2/ADEOS2 and POLDER/ADEOS (Deschamps et al., 1994) measures, since 2005, the polarized signal in the visible spectral range with up to 14 viewing directions. The airborne version of this instrument, called OSIRIS (observing system including polarization in the solar infrared spectrum (Auriol et al., 2008)), is nowadays extended to the near-infrared range and will maybe, in the future, generate a spaceborne version. The Aerosol Polarimetry Sensor (APS), the spaceborne version of the Research Scanning Radiometer (RSP) will be able to measure reflected total and polarized light in visible, near infrared, and short-wave infrared and should be launched in the framework of the Glory mission in 2010 (Mishchenko et al., 2007).

RADIATION PROCESSES IN THE ATMOSPHERE AND OCEAN (IRS2012): Proceedings of the International Radiation Symposium (IRC/IAMAS), 2013

ABSTRACT To estimate cirrus inhomogeneity effects on the apparent backscatter and on the apparent... more ABSTRACT To estimate cirrus inhomogeneity effects on the apparent backscatter and on the apparent depolarization ratio measured by CALIOP/CALIPSO, a 3D polarized Monte Carlo LIDAR simulator was developed. Comparisons were done with the fast Hogan&apos;s LIDAR simulator. Early results show that clouds inhomogeneous effects seem to be negligible on the apparent backscatter but not on the apparent depolarization ratio.

&lt;p&gt;Radiative Budget, essential to the monitoring of climate change, can be ... more &lt;p&gt;Radiative Budget, essential to the monitoring of climate change, can be investigated with ERB-dedicated instruments like the Clouds and the Earth Radiant Energy System (CERES) instrument (Wielicki, 1996). On the other side, non-dedicated instruments, such as POLDER-3/PARASOL measuring narrowband radiances, can also be used advantageously to obtain shortwave albedos and fluxes (Buriez et al, 2007; Viollier et al, 2002).&lt;/p&gt;&lt;p&gt;We present here a comparison between the shortwave fluxes and albedos derived from POLDER-3 and those derived from CERES flying aboard Aqua, chosen as a reference.&lt;/p&gt;&lt;p&gt;Monthly means of shortwave fluxes computed from the measurements of the two instruments are first set side by side. They show a good agreement in the all-sky case. However, after December 2009, the values from POLDER-3 display a slight drift which coincides with the lowering of the orbit of the PARASOL satellite and the modification of its overpass time in comparison to the other satellites of the A-Train mission. In clear sky situations, greater differences between POLDER and CERES shortwave fluxes are observed, especially over land regions, and the drift increases faster after 2009.&lt;/p&gt;&lt;p&gt;A second comparison is presented, between instantaneous albedos. For the period of coincident observations between POLDER-3 and CERES/Aqua, there is a good correlation between both products. This correlation deteriorates when the comparison is extended after 2009, as the values given by POLDER-3 increase. This result is expected, as the albedo is a function of the Solar Zenith Angle.&lt;/p&gt;&lt;p&gt;The slope of the increase of instantaneous albedo values is higher than for the diurnally extrapolated, monthly averaged shortwave fluxes. This tends to show that the POLDER algorithm leading to the monthly means of diurnal shortwave albedos moderates the increase of instantaneous shortwave albedo values but it doesn&amp;#8217;t completely compensate for the effects of the drift of the instrument.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;

AGU Fall Meeting Abstracts, Dec 1, 2020

Japan Geoscience Union, 2017

Since March 2005, the PARASOL mission has been providing coincident data from POLDER3 (Polarizati... more Since March 2005, the PARASOL mission has been providing coincident data from POLDER3 (Polarization and Directionality of the Earth Reflectances) with MODIS (Moderate Resolution Imaging Spectroradiometer) on AQUA, achieving one of the numerous challenging AQUA-Train experiment objectives. Combination of these two instruments provide a unique opportunity to study clouds using high spatial resolution, multispectral, multidirectional and polarization measurements. Based on

PARASOL and AQUA are two sun-synchronous orbit satellites in the queue of A-Train satellites that... more PARASOL and AQUA are two sun-synchronous orbit satellites in the queue of A-Train satellites that observe our earth within a few minutes apart from each other. Aboard these two platforms, POLDER and MODIS provide coincident observations of the cloud cover with very different characteristics. These give us a good opportunity to study the clouds system and evaluate strengths and weaknesses

Getting informations about the vertical structure of cloud covers (altitude, geometrical thicknes... more Getting informations about the vertical structure of cloud covers (altitude, geometrical thickness, multilayer features) is of high interest for different applications (vertical profile of radiative heating rate in the atmosphere, weather forecast). We show here interest in the multiangular character of PARASOL measurements in the oxygen A-band to infer macrophysical properties of cloud structures. Our idea is to detect from