May 122017

The EGU general assembly in Vienna, 8-13 April 2017 is a Conference for all scientist interested in geophysical topics. Over 14000 people attended this conference, coming from all over the world. Off-course, the ATMOS group and the GRS department were also represented.

Some Highlights:

The GRS group at the EGU (Not including Stephanie Ruslie and Egli Michailidou):

Gert Mulder giving a presentation on InSAR data assimilation in operational weather models:

Main course of the week:

Scroll trough the GRS tweets, #EGU17 !


May 122017

Following the past symposia in Lille, France in 2007 and in New Orleans in 2010, the 3rd NASA A-Train symposium was held on 19-21 April in Pasadena (California, USA). The NASA A-Train is a unique afternoon constellation including a high value series of instruments (Aqua (2002), Aura (2004), PARASOL (2004), CALIPSO (2006), CloudSat (2006), GCOM-W1 (2012) and OCO-2 (2014)) observing our atmosphere.

Julien Chimot was honoured to give a talk, on Thursday 20 April on our recently achieved developments related to the OMI aerosol layer height neural network development (Chimot et al., 2017) and its applications to urban pollution and biomass burning events.This work has been published in the AMT journal in Mars 2017

Many exchanges allow me to think further about 1) the difficulties, even for LIDAR space-borne sensors, to entirely probe smoke aerosol layers, 2) the possibility to inter-compare OMI and OCO-2 aerosol layer height products in the future.

A lot of talks and posters were focused on their contributions to our aerosol and cloud cycle knowledge, and the forthcoming new generation of satellite instruments such as 3MI on MetOp-SG and the new LIDAR EarthCare. Discussions were also held on the recently launched Chinese mission TANSAT, devoted to CO2 observation, which plans to join the constellation soon. With the American mission OCO-2, there will be 2 satellite missions focusing on the atmospheric carbon cycle!

Finally, it is worth noting the very interesting & inspiring discussion led by Dr. Bruce Wieliecki on the economic value of climate science. Obviously, this is a burning and still very open topic. And it is hard to reach a consensus in our community. But if we want to convince the society with business key words, the (huge!) return of investment of a new climate observing system should then be more quantitatively emphasized to initiate concrete actions.

Great thanks to all the organizers of this symposium (in particular to Liz Juvera) and to all the instrument PIs of the A-Train constellation!


2 weeks later. A poster was displayed by Dr. Pieternel Levelt at EGU 2017. See more details at

More information?

  • 3rd NASA A-Train symposium 2017 here
  • Talk at the 3rd NASA A-Train symposium: Chimot J., Veefkind P., Vlemmix T., de Haan J., Levelt P., Aerosol layer height retrieval from OMI+MODIS – A neural network approach, 3rd NASA A-Train symposium, Pasadena, California, USA, 2017.04.20 (Talk) here
  • Chimot et al., 2017: Chimot, J., Veefkind, J. P., Vlemmix, T., de Haan, J. F., Amiridis, V., Proestakis, E., Marinou, E., and Levelt, P. F.: An exploratory study on the aerosol height retrieval from OMI measurements of the 477  nm O2 − O2 spectral band using a neural network approach, Atmos. Meas. Tech., 10, 783-809, doi:10.5194/amt-10-783-2017, 2017 here
  • Follow & @JChimotResearch

The entrance of the Pasadena convention centre, with the banner of the symposium.

Pasadena (California, USA) city-hall

Badge at the 3rd NASA A-Train symposium

Front slide of Julien Chimot talk at the 3rd NASA A-Train symposium, Pasadena (California, USA), 2017.04.20.

Mar 272017

The 11th European Conference on Antennas and Propagation, held in Paris, France, on 19-24 March 2017. Jiapeng Yin, the Ph.D. student in the Atmospheric Remote Sensing Group of the GRS department, made a presentation titled “Spectral Polarimetric Features Analysis of Wind Turbine Clutter in Weather Radar”. This paper was selected to be a finalist for a best paper award, and the finalist papers were requested to present their work in a work in a special poster session dedicated to the Awards. This session took place on Thursday afternoon, March 23, 2017, and gave a possibility for many additional discussions and contacts. Unfortunately, we did not receive the Award.

The increasing size and quantity of wind turbines worldwide provide an environmental-friendly solution to fulfill the growing demand for energy. However, this also brings in a new dynamic clutter named wind turbine clutter (WTC) for weather radars, and it has gradually become a concern because WTC deteriorates the radar performance severely. In this paper, Jiapeng mainly introduced the advanced waveform measurements of WTC using the TUD PARSAX radar. Furthermore, the micro-Doppler signature and the spectral-polarimetric properties of WTC were studied. Finally, a WTC mitigation method was put forward.

Additionally, colleagues from the Microwave Sensing, Signals and Systems Group of EWI, Alexander Yarovoy, Oleg Krasnov, Stefano Medagli, and Sharef Neemat also presented at this meeting.

Jan 192017

17 February 2017 | 12:45 – 18:00
location: Theaterzaal (Sport & Culture)


Please register by sending an email to

The Geoscience & Remote Sensing (GRS) department of TU Delft, the TU Delft Climate institute and he Royal Netherlands Meteorological institute KNMI are pleased to invite you to the seminar Urban Air Quality, to be held at the TU Delft Theaterzaal (Sports & Culture) on Friday afternoon 17th February 2017.

Human activities, including industry, traffic, energy generation and food production, have an adverse impact on air quality. This is especially the case in urban areas, where more than half of the world populations lives. Ground based and satellite observations show that policies to reduce the emissions of pollutants are successful in improving air quality. However, is enough done to protect the health of the people in the cities and what can cities in developing countries learn from these successes?

This symposium will bring together experts in the field of  health effects, policy, emission monitoring, ground based observations and satellite remote sensing. It targets a broad audience from students in diverse topics, public, industries, policy makers and researchers. In addition to presentations, there will be possibilities for interactive discussions with the speakers.

See the program below

Dec 092016

The increasing size and quantity of wind turbines worldwide provide an environmental-friendly solution to fulfill the growing demand for energy. However, this also brings in a new dynamic clutter named wind turbine clutter (WTC) for weather radars, and it has gradually become a concern because WTC deteriorates the radar performance severely. During December 6-7, to bring together the increasing number of experts and researchers in the field of electromagnetic waves within the context of wind energy plants and to offer a platform to discuss arising and existing problems, the focus days EMWT’16 provide a fitting platform. In contrast to other conferences EMWT’16 will cover the whole field of electromagnetic waves and wind energy in one specialist meeting in Fraunhofer Institute for High Frequency Physics and Radar Techniques .

Jiapeng Yin, the Ph.D. student in the Atmospheric Remote Sensing Group of the GRS department, made a presentation named “Signatures Study of Wind Turbine Clutter in Polarimetric Doppler Weather Radar” . He mainly introduced the micro-Doppler signature and the spectral-polarimetric properties of WTC based on the measurements of the PARSAX radar in TU Delft campus. This work relies on a recently-accepted conference processing of European Conference on Antennas and Propagation.

Additionally, colleagues from the Microwave Sensing, Signals and Systems Group of EWI, Oleg Krasnov, Faruk Uysal and Stefano Medagli also presented in this meeting. More information can be found on the following websites:

IMG_0674             IMG_0635               IMG_0617

Dec 012016

The Buys Ballot Research School (BBOS) 2016 organized by the IMAU was held in Oranjewoud . This symposium is aimed on PhD students at dutch universities working on fundamental and applied studies of the climate system.

This year PhD students from the GRS-department and the ATMOS group contributed on a wide range of topics:

  • Julien Chimot – Presentation : Retrieving aerosol height from space: A neural network approach applied to OMI O2-O2 measurements PDF
  • Steven van der Linden – Presenation : 1001 nights, a Fairy Tale at Cabauw
  • Thomas Frederikse – Presentation : Closing the Sea Level Budget at a Regional Scale
  • Dimitra Mamali – Poster : Atmospheric particles size distribution and hygroscopicity at Cabauw for the period 2008-2014
  • Antoon van Hooft- Poster : LES is More
    This poster won the award for ‘Best Poster Presentation’ according to the jury and can be viewed here: PDF

We hope to see you at the next BBOS symposium!

Jun 222015
In view of preparing the future European operational satellite missions  dedicated to the atmosphere sounding, the European Space Agency (ESA) organised the ATMOS 2015 conference in at the university of Crete (Greece – Heraklion). This workshop allowed to exchange about retrieval techniques and harmonization of dataset  derived from past and present space-borne atmospheric missions (e.g. GOME, SCIAMACHY, MIPAS, GOMOS, OMI, IASI etc…) and application projects (e.g. Climate Change Initiative, Copernicus). Different sessions were organised about specific topics (greenhouse gases, reactive trace gases and air quality, limb missions). A strong focus was given on the crucial steps to be led by ESA for the successful  preparations of the Sentinel-4 and Sentinel-5 missions (scheduled between 2020 and 2021), the next TROPOMI mission on Sentinel-5 Precursor (before Summer 2016) and the competition between CarbonSat and FLEX missions with a final decision to be taken in September 2015. Around 200 researchers involved in the measurements of atmospheric trace gases, aerosols and clouds from passive satellite sensors were present.
Julien Chimot, PhD in the Atmosphere research team of the GRS department, had the opportunity to present his poster about the impact of aerosol particles on the quantification of  NO2 concentrations in the troposphere from the OMI measurements. This poster relies on a paper recently submitted to the AMT journal (Atmospheric Measurement Technique).
more information can be found on the following websites:
– ATMOS 2015:
– Competition between CarbonSat and FLEX:
– the TROPOMI project:

Julien Chimot
Jun 122015

RainGain is a project within the Framework of the COP21 Preparation and stands for



The EU INTERREG NWE IVB RainGain project has focused on recent remote sensing technologies to achieve a finer urban water management and to build up resilience to weather extremes and climate change. The RainGain conference will address all the issues related to high-resolution rainfall measurement, nowcasting and hydrological modelling, as well as their advanced applications to urban water management and stakeholder’s capacity building.

More info can be found here:

The poster that was presented was titled: ” Dual-Polarimetric X-Band Weather Radar: Accurate Rainfall Estimation and Storm Observations ” and can be found here.

More RainGain news:

International RainGain Workshop on March 24th 2015 in Rotterdam.


  • Extreme rainfall in Jakarta
  • Amsterdam Rainproof
  • Coping with extreme rainfall
  • Added value X-band radar

More info can be found in:

Ricardo_small herman_small

by Ricardo Reinoso Rondinel

Apr 202015

Last week Stephanie Prianto Rusli and Lukas Pfitzenmaier presented posters at the European Geoscience Union in Vienna. This conference gave a grate opportunity to meet a brought range of scientists from all kinds of Geoscience and come into discussion. It also gave the opportunity to go into interdisciplinary sessions and generate new ideas.


Stephanies poster was in the the session: Remote Sensing of Clouds and Aerosols: Techniques and Applications and its title: Multi-sensor approach to retrieving water cloud physical properties and drizzle fraction  (poster here)

Lukas poster could be find in the new session about Observing and modeling processes in moderately supercooled clouds and was dealing with Effect of cloud microphysics on particle growth under mixed phase conditions  (poster here). Discussions and comments within the supercooled cloud community where very fruitful and caused quite some attention. So the changes are high to have a second one in the next EGU 2016.


Mar 252015

The fellows from the ITaRS network met between March 18th-20th 2015 in Barcelona, at UPC (Universitat Politècnica de Catalunya).


The two first days were dedicated on a course about writing skills. Two lecturers from WAS gave us tips and advice to understand better the process of writing a scientific paper. The fellows had to prepare an abstract for a possible article in order to receive direct feedback to improve the understandability of this short text. The interactivity of the lectures made them very interesting. Important to mention is the powerful impact these advice can have on our future scientific publications.

The last day was consecrated to data assimilation. Two researchers from ECMWF (Reading, UK) came to introduce this concept. They explained how observations are useful and important in order to increase the predictability of the weather forecasts. The lectures were very interesting and the quality of their content was at very high scientific level.

MareNostrum3_supercomputer_UPCvisit of supercomputer UPC

We got the chance to visit some of the installations of UPC. We visited the building which houses the impressive supercomputer called MareNostrum (1 petaflop of speed!). The funny fact comes from the original use of this building: it was indeed a former chapel as you can see on the picture.

Finally, it was good to see again all the fellows. We managed to find time to discuss and speak about questions related to ITaRS. We also enjoyed a bit of the nice life of this pretty city.
Ole! 🙂