Thesis defence J. Ding: NOx

26 January 2018 15:00 - Location: Aula, TU Delft - By: webredactie

Satellite-derived Nox emissions over East Asia. Promotor 1: Prof.dr. P.F. Levelt (CiTG); Promotor 2: Prof.dr. R.J. van der A (Nanjing U.).

Nitrogen oxides (NOx) are important air pollutants and play a crucial role in climate change. NOx  emissions are important for chemical transport models to simulate and forecast air quality. Up-to-date emission information also helps policymakers to mitigate air pollution. In this thesis, we have focused on providing better NOx emission estimates with the DECSO (Daily Emission estimates Constrained by  Satellite Observations) inversion algorithm applied to satellite observations. DECSO is a fast algorithm, which enables daily emissions estimates as soon as the satellite observations are available. Satellite-derived emissions reveal more specific information on the location and strength of sources than concentration observations. The monthly and yearly variability in emissions are well captured.  This is demonstrated by our monitoring of the effect of air quality regulations on emissions during events like the 2014 Youth Olympic Games. Near the Chinese coast ship tracks, which are otherwise hidden under the outflow of air pollution from the mainland, are revealed in our NOx emissions derived with DECSO applied to OMI satellite observations. Trends of  shipping emissions for a 10-year period (2007 to 2016) over Chinese seas are presented for the first time.

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For access to theses by the PhD students you can have a look in TU Delft Repository, the digital storage of publications of TU Delft. Theses will be available within a few weeks after the actual thesis defence.