Preliminary Validations of the OMI NO2 Product
Abstract
The OMI nitrogen dioxide (NO2) product is derived from the hyperspectral measurement of the Earth's spectral albedo in the range 415 - 465 nm. Processing data collected over a 24 hour period allows the construction of an"unpolluted" NO2 field, which approximates well the stratospheric and upper tropospheric components of NO2, which in turn allows both the identification of significant enhancements of tropospheric NO2 and a more accurate retrieval where they exist. The processed data are available from the NASA Goddard DAAC. A small number of field campaigns have been undertaken in which ground- and aircraft-based measurements of atmospheric NO2 have been made, coincident with OMI measurements. These include the INTEX-B campaign, the Dandelions campaigns, and some ongoing measurements made using a Brewer spectrophotometer, SAOZ, and a network of DOAS instruments deployed in various locations, from pole to pole, around the world. Some instruments are more sensitive to the tropospheric NO2, some to the stratospheric NO2, and some give accurate measurements of the total column NO2. This should allow the validation of the stratospheric/tropospheric separation process used in the retrieval algorithm. In addition, the retrieval algorithm rests on a set of climatological NO2 profiles. In-situ NOx measurements made during the INTEX-B campaign have been used to validate the assumed climatological profiles. In this poster we review the state of OMI NO2 validation efforts to date.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2006
- Bibcode:
- 2006AGUFM.A31B0891C
- Keywords:
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- 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0345 Pollution: urban and regional (0305;
- 0478;
- 4251);
- 0365 Troposphere: composition and chemistry