Assessment of in-situ and remote sensing NO2 observations during DISCOVER-AQ and KORUS-AQ field campaigns
Abstract
Nitrogen dioxide (NO2) is an important trace gas in the troposphere. It has adverse human health effects and also contributes to the formation of tropospheric ozone, is a criteria pollutant, and has climate impacts. Various types of NO2 measurements were made during DISCOVER-AQ and KORUS-AQ field campaigns, including surface and airborne in-situ volume mixing ratio, Pandora total column, and Ozone Monitoring Instrument (OMI) tropospheric column. We conduct a comprehensive analysis of these measurements. A high-resolution Community Multi-scale Air Quality (CMAQ) model simulation is utilized to interpret representativeness issues and to down-scale OMI NO2 observations to finer spatial resolution. Our analysis suggests that various NO2 observations are broadly consistent, but they often exhibit systematic differences larger than their reported uncertainties. OMI tropospheric NO2 retrievals are highly sensitive to a priori NO2 profile shapes, suggesting that the shape of a priori profiles used in the retrieval algorithm is critically important to the accuracy of the retrieved OMI NO2 data.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A53G2570C
- 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