Sentinel-5P TROPOMI high-resolution nitrogen dioxide observations
Abstract
The TROPOspheric Monitoring Instrument (TROPOMI) is a spectrometer measuring in the UV, visible, near-infrared and short-wave infrared, which allows the retrieval of trace gas species like O3, NO2, HCHO, SO2, CO, CH4 and aerosol aspects like the aerosol index. The Copernicus Sentinel-5P satellite, with TROPOMI as payload, was succesfully launched on 13 October 2017. TROPOMI has a full global coverage each day, but with a much improved resolution (3.5 x 7 km2) compared to the Ozone Monitoring Instrument (OMI) which is providing measurements since 2004. Because of the fine resolution, the TROPOMI observations are expected to be of great importance for estimating pollutant concentrations and emissions at the scale of smaller towns, individual power plants, wildfires and major infrastructures. Operational data products, including NO2, have become available July 2018 (doi: 10.5270/S5P-s4ljg54).
The Nitrogen Dioxide (NO2) tropospheric columns are retrieved using a newly implemented version of the OMI DOAS algorithm developed at KNMI combined with an integrated modelling-retrieval-assimilation approach to derive the air-mass factors and to estimate the stratospheric column. This latter component is based on the TM5-MP chemistry-transport model operated at a resolution of 1x1 degree. Developments from the EU QA4ECV project (www.qa4ecv.eu) have been included in the retrieval software to ensure consistency with the datasets from this project, including OMI NO2. More information can be found at http://www.tropomi.eu/data-products/nitrogen-dioxide. In our contribution we will provide an overview of the TROPOMI NO2 retrieval. Our experiences with the TROPOMI observations during the E1 and E2 phase, and an assessment of the quality of the NO2 product will be discussed. Comparisons will be presented with the OMI NO2 retrievals and QA4ECV NO2 products, with CAMS global and regional air quality models and MAX-DOAS observations. Candidate future improvements to the operational algorithm will be indicated. The benefits of the high-resolution TROPOMI NO2 observations for the monitoring of sources and air quality will be demonstrated.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A51A..02E
- Keywords:
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- 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0368 Troposphere: constituent transport and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 1640 Remote sensing;
- GLOBAL CHANGE