Images

Photo of Pepijn Veefkind

On this page I have put some of the images and movies that I have produced. Feel free to use them for your presentations and publications, but please include the source of these images! You can click on the image to get the full resolution graphics.

OMI NO2 over Europe 2004-2005

This image shows OMI tropospheric NO2 over Europe for the period December 2004 until November 2005. The image was annotated with roads and rivers, and a shading for the orography has been applied. On the right site of the image, zooms for three urban areas are shown. For each of these zooms the color scale has been optimized.

Ozone Hole measured in OMI zoom Mode

This image shows the ozone hole as measured on 22 October 2006 in the OMI zoom mode. In this mode the spatial sampling of OMI is 13x12 km at nadir. Because of the increased spatial sampling, the swath is reduced to approximately 700 km. Therefore there is no daily global coverage in the OMI zoom mode. In the nominal OMI mmeasurement mode global coverage is achieved in one day. The OMI zoom mode is used one day per month.

TRAQ inclined Orbit Concept

This image shows the concept of the inclined orbit as proposed for the ESA TRAQ Earth Explorer. By using an inclined non-sun synchronous orbit, multiple satellite overpasses per day can be achieved over Europe. These sampling strategy can be used to observe the variation of tropospheric gases, like ozone and NO2, over the day. Using a non-sun synchronous orbit has the advantage that not only the daily cycle can be observed over Europe, but also global coverages achieved. To have continuous measurements, at least two inclined satellites are needed. A movie in QuickTime format can be downloaded from this link.

Spatial Resolution of OMI and GOME-2

This image compares the spatial resolution of OMI and GOME-2 over Mexico City. This image is based on retrievals of NO2 from measurements in OMI spatial zoom mode. The 13x12 km OMI zoom pixels were rebinned to match the OMI (13x24) and GOME-2 (40x80 km) pixels. Note the difference in the spatial structure of the air pollution observed from OMI, including some of the smaller cities that are observed. These spatial structures are almost entirely lost in the GOME-2 data. Also note that the cloud structures are not resolved on the GOME-2 resolution, whcih will lead to errors in the cloud correction.

Aerosol Optical Depth over Europe for July 1997

This image shows the aerosol optical depth over Europe for July 1997. This image is based on ATSR-2 data and is the first satellite picture of aerosol optical depth over Europe. This is based on work that I did for my PhD thesis at TNO.