2013.12 – 2018.01: GRS TU Delft, Research Fellow

Research activities: Global mapping atmospheric composition from space – Retrieving aerosol height and tropospheric NO2 from OMI:

  • Sensitivity analysis of the OMI tropospheric NO2 (DOMINO v2 – KNMI) & effective cloud (OMCLDO2 – KNMI, NASA) datasets to the presence of aerosols
  • Contribution to the updated OMCLDO2 cloud retrieval algorithm
  • Development of novel aerosol layer height and optical thickness (AOT) retrieval algorithms, based on a neural network approach, from the OMI 477 nm O2-O2 spectral band
  • Synergy of OMI and MODIS observations for an improved OMI aerosol layer height retrieval
  • Inter-comparison of collocated OMI aerosol layer height, CALIOP aerosol profiles and LIVAS vertical aerosol climatology database
  • Improvement of the aerosol correction within the OMI tropospheric NO2 retrieval

 

Additional tasks:

  • Publication of 3 peer-review papers, in the Atmospheric Measurement Techniques (AMT) journal, and 1 in preparation as 1st 2 additional publications as co-author.
  • Proposal writing for the Dutch funding agency (i.e. NWO)
  • Reviewer of 2 peer-review publications in Atmospheric Chemistry Physic (ACP) journal
  • Close collaboration with the KNMI satellite department (Dr. K. Folkert Boersma, Dr. Piet Stammes, Dr. Johan de Haan, Dr. Marteen Sneep, Dr. Henk Heskes) and the National Observatory of Athens (NOA)
  • 8 oral & 3 poster presentations at international conferences
  • Strong involvement in educational activities as teaching assistant and in student projects
IMG-20180124-WA0000.jpg
After 4 successful years of research collaborations, leaving my KNMI colleagues was not the easiest part. A nice farewell speech given by my colleague Dr. Tim Vlemmix, surrounded by Dr. Piet Stammes, Dr. Johan de Haan, Dr. J. Pepijn Veefkind, and many others in January 2018.

 

My research colleagues at GRS – TU Delft

CiTG

Prof.dr. P.F. (Pieternel) Levelt: Principal Investigator (PI) of OMI (Ozone Monitoring Instrument) on the NASA EOS Aura satellite, head of the Research & Development Satellite Observations department at KNMI, professor of remote sensing of the atmosphere at TU Delft.

Dr. J.P. (Pepijn) Veefkind: Principal Investigator (PI) of TROPOMI (Tropospheric Monitoring Instrument) on the Sentinel-5 Precursor satellite mission, deputy PI of OMI (Ozone Monitoring Instrument) on the NASA EOS Aura satellite, affiliated with KNMI and  the GRS department.

Prof.dr.ir. H.W.J. (Herman) Russchenberg: Full professor & head of Atmospheric Remote Sensing group, head of the GRS Department,and Director of the TU Delft Climate Institute.

Gijs van Ouwerker, Bsc student Applied Earth Sciences – Honours programme (2017-): in the frame of his Bsc programme, Gijs is analysing CALIOP and MODIS satellite aerosol observations over biomass burning episodes. The idea is to understand how well 2 different satellite techniques (active vs. passive) can probe thick smoke layers. Supervised by Msc. Julien Chimot.

Eva Stierman, Msc student GRS (2017-): Eva worked, through her Msc thesis, on the evaluation of the water products from Sentinel-3. Among other things, she focuses on the accuracy of the atmosphere correction (i.e. aerosol scattering and trace gas absorption). Coordinated by Deltares (Dr. Marieke Eleveld), Rijkswaterstraat & GRS – TU Delft.

Jerry Ge, Msc student GRS (2016): Jerry worked on NO2 airborne observations with the Tropolite sensor during his Msc thesis coordinated by Dr. Tim Vlemmix. Now, he is research fellow (PhD) at the university of Wageningen.

Jiyuntig Sun, Msc student GRS (2016): Jiyuntig developed fine-scale simulations of NO2, based on a LES approach, during her Msc thesis supervised by Dr. Tim Vlemmix. She is now at KNMI working as research fellow (PhD) with Dr. J. Pepijn Veefkind.

Jasper Snoek, Bsc student Applied Earth Sciences – TU Delft (2016): Jasper compared tropospheric NO2 observations from a ground-based MAX-DOAS instrument and a new TNO prototype under the coordination of Dr. Tim Vlemmix..

Corné Verhoeven, Bsc student (2016): Corné worked on measuring tropospheric NO2 and aerosols in India during his Bsc project, coordinated by Dr. Tim Vlemmix.

 

My research colleagues at KNMI

Our GRS – TU Delft group benefits from great supports of the Research & Development Satellite Observations department, The Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands

KNMI

Here is a list (non exhaustive) of the main colleagues with whom I use to exchange and collaborate on a regular basis:

 

Prof.dr. P.F. (Pieternel) Levelt: Principal Investigator (PI) of OMI (Ozone Monitoring Instrument) on the NASA EOS Aura satellite, head of the Research & Development Satellite Observations department at KNMI, professor of remote sensing of the atmosphere at TU Delft.

Dr. J.P. (Pepijn) Veefkind: Principal Investigator (PI) of TROPOMI (Tropospheric Monitoring Instrument) on the Sentinel-5 Precursor satellite mission, deputy PI of OMI (Ozone Monitoring Instrument) on the NASA EOS Aura satellite, affiliated with KNMI and  the GRS department.

Dr. T. (Tim) Vlemmix: Formerly, assistant professor in remote sensing of atmospheric composition at TU Delft.. Now, researcher on new sensor design for NO2 observations (cf. Tropolight). His research focuses mostly on the remote sensing of tropospheric NO2, an important component of air pollution.

Dr. Folkert Boersma: Atmospheric scientist and teacher at Wageningen University (Meteorology and Air Quality Group) and the Royal Netherlands Meteorological Institute (KNMI). His research aims to better understand the sources, the concentrations, and the effects of air pollution by using satellite measurements. Scientific co-ordinator for the European Union FP7 research project Quality Assurance from Space (QA4ECV).

Stimulating exchanges, through my current research project, on tropospheric NO2 retrieval from OMI measurements, related uncertainties, and the nested effects of clouds / aerosols & their correction schemes. Strong and rigorous scientist.

Dr. Piet Stammes: Senior scientist at KNMI, dedicated to radiative transfer (RT) in the solar spectral range, and retrieval of clouds, aerosols and trace gases from satellite measurements of scattered solar radiation. Specific topics are RT modelling (DAK model), O2 A-band, polarisation, and simple retrieval techniques. He is involved in several projects using GOME-1, SCIAMACHY, OMI, GOSAT, and GOME-2 satellite data.

Expert advices on aerosol effects and radiative transfer modelling, for single and multiple light scattering, in the UV and visible spectral range. Great positive supports on my research analyses and the novel developed OMI aerosol height algorithms.

 

My teaching colleagues at GRS – TU Delft

In addition to my research group members at GRS – TU Delft, here is a list of colleagues with whom I have collaborated for teaching and education activities:

IMG_3159
Dr. Roderik Lindenbergh (left) and Msc. Julien Chimot (right) during the Vesc fieldwork campaign, with TU Delft Bsc students, in June 2014.

Dr. Roderik Lindenbergh: Assistant professor at the GRS department and TU Delft. His research focuses on in Laser Ranging; Interpolation Techniques. Principal lecturer of the course “Geostatistics and Remote Sensing” and associated Remote sensing part of the Vesc fieldwork, Bachelor 2nd year Bachelor program Applied Earth Sciences.

Drs. J.C. (Jan-Kees) Blom: Full time lecturer at the Geoscience & Engineering department of TU Delft. Responsible of teaching, Structural Geology, Fieldwork & Excursions in the BSc and MSc programmes in Applied Earth Sciences. Leader of the whole Vesc fieldwork.

R.J.G. (Remi) Charton, MSc: Research fellow candidate (PhD) in Applied Geology at the department of Geoscience & Engineering, TU Delft. His expertise includes Geology, petroleum geology, sedimentology, and seismic interpretation. Geology teaching assistant in the Vesc fieldwork.

David Kunst, Msc: Master science candidate in Geo-Engineering, teaching assistance on geology topic during the Vesc fieldwork.

Adriaan van Natijne: Master science candidate in Geoscience & Remote Sensing (GRS), supports on the preparation of Sentinel-2 data sets (download, + atmospheric correction) for Vesc field-campaign 2017.

Dr. Joep E.A. Storms: Associate professor at the Geoscience & Engineering department of TU Delft. MSc coordinator Specialization Reservoir Geology.  Researcher on fluvial, deltaic and coastal depositional processes, predominantly on the complex interaction between sediment dynamics, sea level change and preservation potential, which governs the formation of the sedimentary record and potential reservoir characteristics. Geology teaching assistant in the Vesc fieldwork.

Dr. Hemmo A. Abels: Assistant professor at the Geoscience & Engineering department of TU Delft. Sedimentologist / Stratigrapher with key interests on detecting and understanding internal and external forcing processes on non-marine sedimentation in ancient rock outcrops. Geology teaching assistant in the Vesc fieldwork.