Megha-Tropiques Mission Megha-Tropiques Mission Syndication 2017-05-24T07:52:28+01:00 Megha-Tropiques Mission text/html 2016-10-20T11:35:22+01:00 oct 2016:CNES and ISRO signed the four-year extension of the Megha-Tropiques mission Thursday 6 October, CNES President Jean-Yves Le Gall and AS Kiran Kumar, Chairman of the Indian Space Research Organization (ISRO), signed at CNES’s Head Office in Paris a four-year extension of the Megha-Tropiques mission launched five years ago. See the press release ( text/html 2016-02-02T08:39:01+01:00 Feb 2016: Collaboration between the MT french science team and the Indian Institue of Science Clement Guilloteau (student from the Megha-Tropiques french scientific team) is visiting the Indian Institue of Science in Bangalore as part of his doctoral project to collaborate with Dr. V. Venugopal from December 2015 to February 2016. The aim of this visit is to benefit from Dr. Venugopal's expert knowledge in multi-scale representation in view of the downscaling of the Megha-Tropiques rainfall product. The collaboration will also be an opportunity to test the methods developed for West Africa under the Indian climate. text/html 2016-02-02T08:34:28+01:00 Feb 2016: Publication of the Megha-Tropiques Technical Memorandum n°7 This technical report presents recent effort to compute variograms using a spectral method. Variograms are used to compute the sampliing uncertainty of the 1°/1 day rainfall amount of the TAPEER product. The document is available here: Megha-Tropiques Technical Memorandum n°7 (index.php?option=com_docman task=doc_download gid=390). text/html 2015-09-11T09:49:47+01:00 September 2015: Release of relative humidity profile products Layer-averaged Relative Humidity profiles (index.php?option=com_content task=view id=140 Itemid=1) are now available on the ICARE data center ( since the launch of the Megha-Tropiques satellite. This product decomposes the troposphere into 6 layers: 100-200hPa, 250-350hPa, 400-600hPa, 650-700hPa, 750-800hPa and 850-950hPa. The retrieval scheme named ARPIA for Atmospheric Relative humidity profile Including the Analysis of confidence intervals encompasses the estimation of the mean RH as well as its standard deviation interpreted as the 1-sigma confidence interval. ARPIA considered cloud-free and cloudy conditions, oceanic and continental scenes. The only limit is for icy layers on top of convective clouds and for precipitating conditions, which are withdrawn using the Hong et al (2005) threshold method adapted for SAPHIR channels. The details of the method is described in a recently submitted paper (Brogniez et al., hopefully soon available) text/html 2015-05-19T05:47:02+01:00 18 May 2015: publication of the article on the Megha-Tropiques review Publication of the article in Frontiers in Earth Science, section Atmospheric Science: The Megha-Tropiques mission: a review after three years in orbit, by Rémy Roca, Hélène Brogniez, Philippe Chambon, Olivier Chomette, Sophie Cloché, Marielle Eliane Gosset, Jean-francois Mahfouf, Patrick Raberanto, Nicolas Viltard. To view the online publication, please click here ( . text/html 2015-03-20T10:26:58+01:00 Save the date: 29-30 june 2015, Joint workshop on uncertainties at 183 GHz, Paris We are pleased to announce the Joint workshop on uncertainties at 183GHz , which is aimed at identifying possible explanations for biases observed between measured and simulated 183 GHz data. The workshop, sponsored by the Megha-Tropiques mission, will be held at University Pierre et Marie Curie (Paris, France) from 29-30 June 2015. If you are willing to attend, please register via the workshop website : ( text/html 2015-03-16T09:54:04+01:00 March 2015: Release of the experimental version of the TAPEER rainfall dataset for JJAS 2012-2014 We are happy to inform you about the release of an experimental version of the TAPEER rainfall data. The product consists in 1° x 1 ° x 1 day accumulated rainfall estimate (in mm) and the associated uncertainty estimation. The release concerns the June, July, August and September 2012, 2013 and 2014 over the tropical belt (30s-30n). The format is netCDF. The TAPEER approach merges IR geostationary data at full resolution with the GPM constellation microwave imagers, including SAPHIR on board Megha-Tropiques. More information on the data, (surface-accumulated-rainfall-product.html) The finalized dataset, covering all the period since the launch of Megha-Tropiques, will be released in the coming months via the ICARE center ( in France. We will keep you posted on this formal release. By then any feedback will be appreciated as it will help to improve the products before this formal release. Please send your comments to me : ( To access the data: ( text/html 2015-03-09T08:36:48+01:00 Save the date: 17-19 november 2015, Conference on Water and Energy cycles in the tropics, Paris The aim of the conference is to provide a forum to review and discuss the latest research on the topic of the water and energy cycles with emphasis on tropical regions. The tropical energy cycles are central to the climate, its variability and its future evolution as reflected in the WCRP Grand Challenges being led by both the GEWEX program and the WGCM. The dynamical nature of the tropical water cycle and the control on the energy balance on both the tropical atmospheric dynamics and water cycle is one of the main incentives of the conference. Sessions covering the various aspects of this complex coupled problem are anticipated, including topics on the large scale Hadley/Walker circulation, the ITCZ, ENSO, monsoons, MJO, tropical convection, extreme rain events and droughts, and water and energy budget studies associated with these phenomena. The conference will bring together theoretical, observing (in-situ and from satellites) and modeling perspectives as well as address the evolution of the tropical phenomena under climate change. The conference is to be organized by CNES, CNRS, with the support of IPSL, with the sponsorship of GEWEX and will be held from 17 to 19 November 2015 in the Institut d'Océanographie, in the heart of Paris, France. More information and updates at: ( text/html 2014-10-21T08:38:45+01:00 13-17 oct 2014: The Climate Symposium Dr Roca was invited to give a talk on Tropical Rain Bearing Systems and the changing water cycle at the Climate Symposium ( that took place last week in Darmstadt, Germany. Dr Roca presentation's was based on the recently published paper in Journal of Climate dealing with the importance of the Mesoscale Convective Systems in the tropical rainfall budget (Roca et al., 2014 ( ). At the symposium, an updated investigation was shown where for the first time the rainfall data from the Megha-Tropiques team were used. The TAPEER v1.0 data indeed included all the GPM constellation member active during the period of study (summer 2012) including the MADRAS data. These data available available in the coming weeks through the ICARE data center ( , stay tuned ! text/html 2014-10-16T13:00:01+01:00 Presentations of the Joint CERES-GERB and SCARAB Earth Radiation Budget Workshop The MT team hosted a joint workshop on Earth Radiation Budget (ERB), with the CERES, GERB and ScaRaB science teams, on 7-10 october 2014 in Toulouse, France. The purpose of this workshop was to bring the CERES, GERB and ScaRaB communities together in order to maximize the exchange of information and ideas on how to make optimal synergistic use of the data from all 3 missions. You can find the presentations of the workshop on the CERES web site ( . text/html 2014-07-31T07:45:53+01:00 7-10 oct 2014: Joint CERES-GERB and SCARAB Earth Radiation Budget workshop The CERES, GERB and ScaRaB science teams are pleased to announce a joint workshop on Earth Radiation Budget (ERB) Observations to be hosted by the ScaRaB team on 7-10 October 2014 in Toulouse, France (more details here ( All three of these missions provide complementary information on the Earth’s radiation budget. CERES provides cloud-aerosol-radiation budget data globally each day but at limited times of the day due to its sun-synchronous orbit. GERB provides very high temporal coverage of the ERB from its geostationary orbit over a limited portion of the Earth, and ScaRaB on Megha-Tropiques provides ERB data from a low-inclination orbit. Such a remarkable and historic set of concurrent observations will provide unique opportunities to improve our understanding of the ERB from both the observational and modeling perspectives. The purpose of this workshop is to bring the CERES, GERB, and ScaRaB communities together in order to maximize the exchange of information and ideas on this critically important area of Earth science. The workshop will consist of 1.5 days of presentations from each team on instrument/algorithm/validation status and two days of invited and contributed science presentations, as well as discussions on how to make optimal synergistic use of the data from all 3 missions text/html 2014-05-20T12:41:45+01:00 May 2014: Publication of the book "HANDBOOK OF SATELLITE ORBITS - from Kepler to GPS" In this book, Megha-Tropiques orbitography is very well explained and represented. Michel Capderou HANDBOOK OF SATELLITE ORBITS - from Kepler to GPS Springer, 2014 950 pages, 369 illus., 292 illus. in color. Foreword by Charles Elachi, JPL Director. ISBN 978-3-319-03415-7. Hardcover. text/html 2014-03-04T13:40:36+01:00 3 mars 2014: mise en ligne des présentations "Journée de validation Megha-Tropiques" du 14/02/2014 Les présentations sont disponibles ici (index.php?option=com_content task=view id=235 Itemid=1) . text/html 2014-02-28T16:02:26+01:00 27 February 2014: Successful launch of GPM-Core GPM Core satellite ( (NASA/JAXA cooperation) was successfully launched from Tanegashima Space Center in southern Japan at 1:37 p.m. EST Thursday, Feb. 27. The GPM Core will be on a 65° inclination orbit, sampling the tropics and the mid-latitudes with its passive microwave radiometer, GMI, and its two radars (Ka and Ku band), to detect rain and snow events. The GPM Core will be used as a reference to intercalibrate and compare all the data from the different satellites of the GPM constellation among which Megha-Tropiques is a key player between 30°N and 30°S. Satellite operations and instruments checking will take place in the next few weeks. Data availability is foreseen 6 month from now. text/html 2014-01-28T13:31:34+01:00 27 février 2014 : lancement annoncé de GPM-core Un article ( du journal Le Monde à propos du futur lancement de GPM-Core annoncé par la Nasa pour le 27 février 2014. Plus d'infos ainsi que le décompte du lancement sur le site de la NASA ici ( text/html 2014-01-23T13:18:02+01:00 14 février 2014: Journée de présentation des résultats de la validation des produits Megha-Tropiques L'évènement aura lieu le Vendredi 14 février 2014 à partir de 10h dans l’amphithéâtre ASTIER du bâtiment Esclangon à Jussieu. Le programme des présentations de la journée est disponible ici (dmdocuments/planning_14février2014_secondannouncement.pdf) . text/html 2014-01-16T07:14:55+01:00 28 december 2013 to 4 january 2014 : Typhoon Bejisa seen by SAPHIR on Megha-Tropiques Typhoon Bejisa took place in the western part of the Indian Ocean from December 28th, 2013 to January 4th, 2014. The storm center passed approximately 100 km of La Réunion Island in the afternon of January 2nd. The SAPHIR instrument was able to capture 21 brightness temperature images showing the evolution of the storm structure from its early stage as a tropical depression, to the full cyclone, and then to the dissipating stage. The image shown here is the 183+-11 GHz image on january 1st at 2045 UTC, showing the storm at one of its most intense moment while moving toward La Réunion. The eye and eyewall structure are clearly visible and also the convective rain bands extending to the south-east and affecting la Reunion and Mauricius. A pdf document with all the images and also with the retrieved Upper Tropospheric Humidity can be found here (dmdocuments/Document_Bejisa.pdf). Full resolution images are available here (data/qlooks/Bejisa/) . text/html 2013-12-20T11:38:54+01:00 16/12/2013: PhD thesis Defense of Ramses Sivira The PhD thesis of Ramses Sivira (advisors: Dr Cécile Mallet and Dr Hélène Brogniez, UVSQ/LATMOS) has the following title: Development of a retrieval method of relative humidity profiles and their conditional distribution of errors for Megha-Tropiques observations text/html 2013-12-02T13:04:23+01:00 Mise en ligne des présentations de la journée cycle de vie des MCS du 23/09/2013 Le compte rendu ainsi que les présentations de la journée 'Cycle de vie des MCS' qui s'est tenue le 23 septembre 2013 au CNRM à Toulouse sont désormais disponibles ici (index.php?option=com_content task=view id=229 Itemid=1). text/html 2013-10-25T13:29:34+01:00 25 October 2013: Release of the french scientific Level 2 products for SCARAB and SAPHIR We are delighted to announce the release of the french scientific Level 2 products for the SCARAB and the SAPHIR instruments.