On 1 June 2011 I returned to the Royal Netherlands Meteorological Institute (KNMI), after having been there during 1999-2004 and at the Belgium Institute of Space Aeronomy (BIRA-IASB) during 2004-2009.
The research division I am in at KNMI is called Satellite Observations.
See for more information on NO2, data and maps the TEMIS website.
It was time to implement a few improvements to the data processing system: higher spatial resolution, more recent background input data, improved cloud correction, improved error estimates, etc., thus created dataset version 2.0.
The image on the left shows the UV index over Europe as derived from ozone measurements of the GOME-2 instrument. [Source: TEMIS website]
This module -- which is, of course, in Dutch -- can be found at this webpage; the cover of the module is shown on the right. Two web pages, also in Dutch, with some additional information are used in this describe from spectrum to ozone to UV index and UV index & UV dose time series.Furthermore I have contributed to the educational material made by KNMI in relation to the GLOBE Aerosol activities (see below). And I have contributed to material for "Earth Observation and Climate" workshops KNMI occasionally gives for schools, e.g. in the country-wide framework of science activities schools ("Wetenschapsweek" and such).
In our group we have bougth a few Calitoo's and we are using these to measure the AOT in several places, when one of us travels to some place or during campaigns. For the moment this is done ad-hoc. My involvement in this is handing out the instruments and gathering the AOT data.
The image on the left shows measurements of the AOT performed from my balcony in Utrecht on a very sunny (and very warm) day.
The Global Learning and Observations to Benefit the Environment (GLOBE) program is a worldwide hands-on, primary and secondary school-based science and education program. GLOBE's vision promotes and supports students, teachers and scientists to collaborate on inquiry-based investigations of the environment and the Earth system working [...] in study and research about the dynamics of Earth's environment.Aerosols are small particles (dust, sand, etc.) and droplets floating in the air. Aerosols contribute to the greenhouse effect and climate change, and they can cause breathing problems. For this reason aerosol concentrations are monitored by satellite and ground based instruments. Within GLOBE pupils can contribute to the understanding of aerosol concentrations by taking daily measurements of the sunlight.
[Source: The GLOBE program website]
For GLOBE Netherlands KNMI coordinates the aerosol measurements and uses the data for comparisons with satellite measurements.
===> list of my publications about my post-doc. positions in atmospheric research.
See a separate page
for the meaning of some acronyms.
Place of work
Royal Netherlands Meteorological Institute (KNMI)
Climate Research and Seismology Department
Atmosphere and Climate Devision
P.O. Box 201
3730 AE De Bilt
visiting address: Utrechtseweg 297, De Bilt
By the way:
During the period June 2011 - May 2014 I was officially not employed by KNMI itself but by the KNMI-operated Stichting Wetenschappelijk Onderzoek (SWO; "Foundation for Scientific Research" in English).
Since 2 Sept. 2014 I am employed by KNMI -- via the Ministery of Infrastructure and Environment, of which KNMI is part (for contractual reasons there had to be a gap between the contracts).
Jos van Geffen -- Home | Site Map | Contact Me