ICARE Highlights

POLDER/PARASOL full reprocessing and
new multi-sensor synergistic products – April 2017


At the end of the PARASOL mission, CNES completed the final reprocessing of Level-1 data in 2014. ICARE completed the reprocessing of the PARASOL Level-2 and Level-3 products in 2015, using revised science codes as well as new codes provided by the French science team at LOA (University of Lille).
In addition to the HDF5 version of the products, released in 2016, global gridded Level-2 and Level-3 products are also available now in HDF5 format.
The Level-2 and Level-3 products are generated from the Level-1 data alone or in combination with other data sets. PARASOL stand-alone products include the Level-2 and Level-3 data sets and the PARASOL "CALTRACK" product (subset colocated with the CALIPSO/CALIOP subtrack).
More recently, an innovative algorithm, called "GRASP" (Generalized Retrieval of Aerosol and Surface Properties), has been developed to retrieve simultaneously many more parameters compared to the standard product. Finally, the unique synergistic "PM-L2” Level-2 product is derived from combined PARASOL and Aqua/MODIS observations.

Release of CALIPSO V4-10 Level-1 and Level-2 Lidar products
November 2016 – Updated March 2017


Update of previous highlight posted in November 2016.
The CALIPSO mission announces the release of new versions of its standard Level-1 and Level-2 lidar data products. These products are available through the Atmospheric Science Data Center (ASDC) at NASA Langley Research Center and the French AERIS/ICARE Data and Services Center in Lille, France. The new data products consist of the Version 4.10 Lidar Level-1 Products and Version 4.10 Lidar Level-2 Products. The V4.10 CALIOP Level 2 data products are the first major revision to the Level 2 product suite since May 2010. The extensive improvements made in this new release correct numerous artifacts and significantly enhance the content and quality of the science data. In addition to the substantial updates made to all existing Level 2 products, V4.10 introduces a new merged layer product that reports the spatial and optical properties of cloud and aerosol layers in a single file.
Users are instructed not to use Version 4.00 Lidar Level 1 product any longer and to use instead the Version 4.10 for science use. The product is available beginning with data from June 13, 2006 (following CALIOP first light), and as of this update, through July 31, 2016. Remaining data will be available as it is produced. The product is now available on all currently existing standard order tools as well as the CALIPSO Search/Sub-setter application.
Version 4.00 Lidar Level 1 will be deleted from the AERIS/ICARE archive in a couple of months.
To see the full announcement of November 2016, click here.

2nd announcement
3rd International A-Train Symposium
18-21 April 2017, Pasadena Convention Center, California


The 705-km Afternoon (A-Train) Satellite Constellation brings together a rich array of instruments to better understand Earth’s changing climate and environment. The 3rd International Symposium on the A-Train Satellite Constellation is an opportunity to learn more about the evolving capabilities of the A-Train system, and to engage other colleagues with similar interests.
To see the second official circular, click here.
Registration and abstract submission are now open. The deadline for abstract submission has been extended to December 16, 2016. There is no registration fee to attend. Additional information regarding the meeting is available on the symposium web site: https://atrain2017.org/

Journée Thématique du Programme National de Télédétection Spatiale
"Observation et modélisation de structures 3D des enveloppes superficielles"
16 mars 2017, CNES, Paris

Le Programme National de Télédétection Spatiale organise le 16 mars 2017 une journée thématique consacrée à "Observation et modélisation de structures 3D des enveloppes superficielles" dans le but de favoriser les échanges entre chercheurs sur cette thématique pluridisciplinaire prometteuse. Cette journée thématique du PNTS se déroulera le 16 mars 2017 à Paris de 9h00 à 17h30. Le programme de la journée et les informations pratiques sont disponibles à l'adresse suivante: http://www-loa.univ-lille1.fr/workshops/workshopPNTS2017/. La participation à cette journée est libre et gratuite, mais l'accès au CNES nécessite une déclaration préalable des participants. Vous êtes donc invité(e) à vous inscrire en remplissant avant le 27 Février 2017 (délai de rigueur) le formulaire en ligne qui est mis à disposition sur le site internet du workshop.

Release of Level-2 Geostationary Cloud Products
August 2016

Cloud type classification for 4 geostationary sensors - Image credit: NOAA/SATMOS/JMA/IPSL/ICARE

AERIS/ICARE Data and Services Center is pleased to announce the public release of cloud products derived from geostationary sensors in collaboration with Meteo-France/CMS/SATMOS and the Megha-Tropiques Science Team. The products (cloud mask, cloud type and cloud top pressure) are available over the period beginning with the Megha-Tropiques mission launch in October 2011 until present. This cloud information obtained at the highest spatial and temporal scale available is an important complement to the Megha-Tropiques mission, which aims at describing the radiative flux, the humidity profiles, and rain fields associated with tropical convection at a high temporal resolution.
Those cloud products are produced using an extended version of the SAFNWC (Satellite Application Facility for NowCasting) algorithm originally developed for SEVIRI by Derrien and Le Gleau (2005, 2010) and adapted to other geostationary data sets (Sèze et al. 2015).
For more information about products and data access, see the Megha-Tropiques 'Products' page (SAFNWC and GEOCLD section).

1st announcement
3rd International A-Train Symposium
19-21 April 2017, Pasadena, California


For over a decade, the A-Train Constellation has successfully collected a uniquely comprehensive environmental data set. The 3rd International A-Train Symposium will be an opportunity to learn and exchange information about A-Train scientific breakthroughs and to highlight how Earth science has benefited from the long, continuous, multi-sensor data set. The 3rd Symposium follows on previous A-Train Symposia held in Lille, France in 2007 and in New Orleans in 2010.
To see the official first circular, click here.
Additional information regarding the meeting, as well as on-line registration and abstract submission form, will be available at the following web site: https://espo.nasa.gov/a-train_2017. Another notice will be sent when registration and abstract submission are open.

New product announcement:
Release of POLAC wind speed product
derived from POLDER/PARASOL observations– May 2016

POLAC wind speed observed by PARASOL
Image credit: Harmel and Chami (2012)


A wind speed product has been developed in the framework of a joint collaboration between the Laboratoire d’Océanographie de Villefranche (France) and ICARE. This new product is derived from POLDER/PARASOL polarimetric and multidirectional observations over the oceans using an algorithm named POLAC (POLarized Atmospheric Correction) and a method based on the dependence of the Sun glint radiation on wind speed. The wind speed is given at full PARASOL native spatial resolution (about 6 km at nadir) on a pixel basis, and in HDF format for each orbit (POLAC-L2 "Level-2") or daily (e.g. globally, POLAC-D3 "Level-3"). The Level-2 and Level-3 products are public. Click here for the Level-2 or here for the daily Level-3 to access the data from the ICARE archive interface. The current version is v1.00, with data processed from March 2005 to October 2013.
For a summary description of the method, see the POLAC document. Detailed description of the algorithm and validation studies using in-situ and satellite data are available in Harmel and Chami, 2011, 2012 and 2013 (see Publications).
This image shows an example of wind speed values retrieved from the PARASOL image acquired on May 5, 2006 over the north-west part of the Mediterranean Sea (from Fig. 1a, Harmel and Chami (2012)).

CALIPSO mission:
10 years analyzing clouds and aerosols
April 28, 2016


Ten years ago to the day, on 28 April 2006, the French-U.S. CALIPSO satellite was sent aloft from Vandenberg Air Force Base, California, atop a Delta II launcher to take up its place in the A-Train constellation. With CALIPSO celebrating 10 years of science measurements in June 2016, it is time to reflect on a mission that has yielded a wealth of data, offering new insights into the workings of Earth’s climate system.
Read the press release (in English).
Lire le communiqué de presse (en français).

Release of CALIPSO V3-00 Lidar Level-3 Aerosol product
October 2015


The Atmospheric Science Data Center (ASDC) at NASA Langley Research Center in collaboration with the CALIPSO mission announces the release of the following monthly data products:

  • CAL_LID_L3_APro_AllSky-Standard-V3-00
  • CAL_LID_L3_APro_CloudFree-Standard-V3-00
  • CAL_LID_L3_APro_CloudySkyTransparent-Standard-V3-00
  • CAL_LID_L3_APro_CloudySkyOpaque-Standard-V3-00
Version 3.00 of the CALIOP Level-3 Aerosol Profile product contains several improvements to the initial beta release including refined sky conditions, reduced biases in single-species averages and corrected mean aerosol optical depth calculations.
The monthly product is available beginning with data from June 2006 (following CALIOP first light on June 13, 2006) through current. The Version 1.00 and 1.30 CALIOP Level-3 Aerosol Profile data products will no longer be generated beyond September 2015.

Public release of Megha-Tropiques/SAPHIR
Relative Humidity profiles products – July 2015


The French Megha-Tropiques science team is pleased to announce the public release of the layer-averaged relative humidity profiles (L2-RH) derived from the SAPHIR instrument. This new Level-2 product is available from the start of the mission (October 2011) until present. (click here to access the data from the ICARE archive interface (current version: v1.00).
The SAPHIR relative humidity profiles are produced for 6 altitude layers: 100-200hPa, 250-350hPa, 400-600hPa, 650-700hPa, 750-800hPa and 850-950hPa. The retrieval scheme named ARPIA ("Atmospheric Relative humidity profile Including the Analysis of confidence intervals") provides an estimate of the mean RH as well as its standard deviation interpreted as the 1-sigma confidence interval. ARPIA considers cloud-free and cloudy conditions, oceanic and continental scenes. Known limitations are for icy layers on top of convective clouds and for precipitating conditions, which are filtered out using the Hong et al. (2005) threshold method adapted for SAPHIR channels.
The details of the method will be soon available in a peer-reviewed paper.