Dataset Edition
| Présentation générale | |||
|---|---|---|---|
| Nom du jeu de données | AEROCLO-sA F20 OSIRIS L2 | ||
| DOI | 10.6096/AEROCLO.1802 | ||
| Créé le | 2019-12-19 | ||
| Projet(s) | AEROCLO | ||
| Date de début (yyyy-mm-dd) | 2019-09-05 | Date 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 | |||
| Résumé | The 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'observation | The 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. | ||
| Références | The 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'instrument | Earth Remote Sensing Instruments > Passive Remote Sensing > Spectrometers/Radiometers > Imaging Spectrometers/Radiometers | ||
| Reference | Auriol et al., 2008 | ||
| Information géographique | |||
| Site 1 | |||
| Mot-clé de localistion | CONTINENT > AFRICA > SOUTHERN AFRICA > NAMIBIA | ||
| Site | Aircraft operations from Walvis Bay, Namibia | ||
| Type de plateforme | AIRCRAFT > F-FALCON 20 | ||
| Longitude minimale (°) | 8 | Longitude maximale (°) | 20 |
| Latitude maximale (°) | -16 | Latitude minimale (°) | -24 |
| Altitude min | 0 | Altitude max | 10000 |
| Instrument environment | The 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 paramètre | Angstrom Exponent | ||
| Mot-clé du paramètre | Atmosphere > Aerosols > Aerosol Optical Depth/Thickness > Angstrom Exponent | ||
| Unité | |||
| Méthodologie d'acquisition et qualité | The 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) | 2019-09-05 | Date de fin (yyyy-mm-dd) | 2019-09-12 |
| Précision du capteur / Incertitude | |||
| Derived parameter 2 | |||
| Nom du paramètre | Aerosol Single Scattering Albedo | ||
| Mot-clé du paramètre | Atmosphere > Aerosols | ||
| Unité | |||
| Méthodologie d'acquisition et qualité | The 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) | 2019-09-05 | Date de fin (yyyy-mm-dd) | 2019-09-12 |
| Précision du capteur / Incertitude | |||
| Derived parameter 3 | |||
| Nom du paramètre | Complex aerosol refractive index | ||
| Mot-clé du paramètre | Atmosphere > Aerosols | ||
| Unité | |||
| Méthodologie d'acquisition et qualité | The 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) | 2019-09-05 | Date de fin (yyyy-mm-dd) | 2019-09-12 |
| Précision du capteur / Incertitude | |||
| Derived parameter 4 | |||
| Nom du paramètre | Cloud Optical Depth/Thickness | ||
| Mot-clé du paramètre | Atmosphere > Clouds > Cloud Microphysics > Cloud Optical Depth/Thickness | ||
| Unité | |||
| Méthodologie d'acquisition et qualité | The 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) | 2019-09-05 | Date de fin (yyyy-mm-dd) | 2019-09-12 |
| Précision du capteur / Incertitude | |||
| Information sur l'utilisation des données | |||
| Conditions d'utilisation des données | The 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 données | AEROCLO data policy | ||
| Base de données | AEROCLO-sA on BAOBAB | ||
| Format des fichiers de données | ascii text | ||
