Dataset Edition

Présentation générale
Nom du jeu de donnéesAEROCLO-sA F20 OSIRIS L2
DOI10.6096/AEROCLO.1802
Créé le2019-12-19
Projet(s)AEROCLO
Date de début (yyyy-mm-dd)2019-09-05Date de fin (yyyy-mm-dd)2019-09-12
Contact(s)

Accès aux données Dataset as provided by the Principal Investigator
History

ISSUE2020-01-23

Description du jeu de données
RésuméThe Observing System Including Polarisation in the Solar Infrared Spectrum (OSIRIS, Auriol et al., 2008) is an airborne propotype of the futur space mission 3MI (Multi-viewing, Multichannel, Multi-polarization instrument). OSIRIS operated from the SAFIRE Falcon 20 during AEROCLO-sA campaign.
Strategie d'observationThe total and polarized radiances are sampled by OSIRIS between 440 and 2200 nm. New retrieval algorithms (Waquet et al., 2013; Peers et al., 2015) allow to simultaneously retrieve the aerosol and surface properties over land and ocean, or the aerosol and cloud properties in case of aerosols above clouds.

The present dataset is focused on visible channels and for cases of aerosol above cloud.
RéférencesThe OSIRIS instrument is described in Auriol et al. (2008):Auriol, F., Léon, J.-F., Balois, J.-Y., Verwaerde, C., François, P., Riedi, J., Parol, F., Waquet, F., Tanré, D. and Goloub, P.: Multidirectional visible and shortwave infrared polarimeter for atmospheric aerosol and cloud observation: OSIRIS (Observing System Including PolaRisation in the Solar Infrared Spectrum), in Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications II, vol. 7149, p. 71491D, International Society for Optics and Photonics., 2008. Algorithms used are described in Waquet et al. (2009) and Peers et al. (2015): Waquet, F., Cornet, C., Deuzé, J.-L., Dubovik, O., Ducos, F., Goloub, P., Herman, M., Lapyonok, T., Labonnote, L. C., Riedi, J., Tanré, D., Thieuleux, F., and Vanbauce, C.: Retrieval of aerosol microphysical and optical properties above liquid clouds from POLDER/PARASOL polarization measurements, Atmos. Meas. Tech., 6, 991–1016, https://doi.org/10.5194/amt-6-991-2013, 2013. Peers, F., F. Waquet, C. Cornet, P. Dubuisson, F. Ducos, P. Goloub, F. Szczap, D. Tanré, and F. Thieuleux. « Absorption of aerosols above clouds from POLDER/PARASOL measurements and estimation of their direct radiative effect ». Atmospheric Chemistry and Physics 15, no 8 : 4179–4196 (2015).
Description de l'instrument
Type d'instrumentEarth Remote Sensing Instruments > Passive Remote Sensing > Spectrometers/Radiometers > Imaging Spectrometers/Radiometers
ReferenceAuriol et al., 2008
Information géographique
Site 1
Mot-clé de localistionCONTINENT > AFRICA > SOUTHERN AFRICA > NAMIBIA
SiteAircraft operations from Walvis Bay, Namibia
Type de plateformeAIRCRAFT > F-FALCON 20
Longitude minimale (°)8Longitude maximale (°)20
Latitude maximale (°)-16Latitude minimale (°)-24
Altitude min0Altitude max10000
Instrument environmentThe aircraft was equipped with active and passive remote sensors as well as in situ probes to document aerosol optical and radiative properties over land and over maritime stratocumulus clouds. In addition to OSIRIS, the Falcon 20 also housed the LNG instrument measuring the atmospheric reflectivity at 3 wavelengths: 355, 532 and 1064 nm. The solar photometer PLASMA was flown for the first time to measure the extinction by aerosols in cloud‐free conditions or above stratocumulus. A dropsonde releasing system, up‐ and down‐looking pyranometers and pyrgeometers, a nadir‐facing CLIMAT infrared radiometer, together with pressure, temperature, humidity and wind sensors, and optical sensors for cloud and aerosol microphysics completed the instrumental suite of the Falcon 20.
Paramètres mesurés
Derived parameter 1
Nom du paramètreAngstrom Exponent
Mot-clé du paramètreAtmosphere > Aerosols > Aerosol Optical Depth/Thickness > Angstrom Exponent
Unité
Méthodologie d'acquisition et qualitéThe Aerosol Optical Depth (AOD) at 490, 550, 670 and 870 nm are obtained from the simulation of total and polarized radiances (on the principal plane of OSIRIS images and from scattering angles between 90° and 130°) described in Waquet et al. (2013) and by using an optimal estimation method. Corresponding Angström exponent and errors are also provided.
Date de début (yyyy-mm-dd)2019-09-05Date de fin (yyyy-mm-dd)2019-09-12
Précision du capteur / Incertitude
Derived parameter 2
Nom du paramètreAerosol Single Scattering Albedo
Mot-clé du paramètreAtmosphere > Aerosols
Unité
Méthodologie d'acquisition et qualitéThe Single Scattering Albedo(SSA) at 490, 550, 670 and 870 nm are obtained from the simulation of total and polarized radiances (on the full principal plane of OSIRIS images) described in Peers et al. (2015). Corresponding errors are also provided.
Date de début (yyyy-mm-dd)2019-09-05Date de fin (yyyy-mm-dd)2019-09-12
Précision du capteur / Incertitude
Derived parameter 3
Nom du paramètreComplex aerosol refractive index
Mot-clé du paramètreAtmosphere > Aerosols
Unité
Méthodologie d'acquisition et qualitéThe real part of the refractive index is fixed according regional mean values obtained from previous studies and AERONET climatology (1.51) and the imaginary part is retrieved using the methood described in Peers et al. (2015).
Date de début (yyyy-mm-dd)2019-09-05Date de fin (yyyy-mm-dd)2019-09-12
Précision du capteur / Incertitude
Derived parameter 4
Nom du paramètreCloud Optical Depth/Thickness
Mot-clé du paramètreAtmosphere > Clouds > Cloud Microphysics > Cloud Optical Depth/Thickness
Unité
Méthodologie d'acquisition et qualitéThe Cloud Optical Depth(COD) at 550 nm is obtained from the simulation of total and polarized radiances (on the full principal plane of OSIRIS images) described in Peers et al. (2015). Corresponding errors are also provided. In addition, droplet effective redius used is provided and fixet at 10 µm.
Date de début (yyyy-mm-dd)2019-09-05Date de fin (yyyy-mm-dd)2019-09-12
Précision du capteur / Incertitude
Information sur l'utilisation des données
Conditions d'utilisation des donnéesThe Principal Investigator(s) of the OSIRIS data for the AEROCLO-sA campaign is Fabien Waquet. If you intend to use the following data please consult with him via e-mail: fabien.waquet@univ-lille.fr. Please consider authorship for the PI whenever using the OSIRIS data. The OIRIS data was acquired with the support of Frédérique Auriol (LOA), Jean-Marc Nicolas (LOA), Rodrique Loisil (LOA), Cyril Delegove (LOA) and with the help of the Falcon 20 operator (SAFIRE, www.safire.fr, a joint entity between CNRS, Météo-France and CNES). Data inversions are realized by Aurélien Chauvigné.
Charte d'accès aux donnéesAEROCLO data policy
Base de donnéesAEROCLO-sA on BAOBAB
Format des fichiers de donnéesascii text