 |
| Titel |
A new stratospheric and tropospheric NO2 retrieval algorithm for nadir-viewing satellite instruments: applications to OMI |
| VerfasserIn |
E. J. Bucsela, N. A. Krotkov, E. A. Celarier, L. N. Lamsal, W. H. Swartz, P. K. Bhartia, K. F. Boersma, J. P. Veefkind, J. F. Gleason, K. E. Pickering |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 10 ; Nr. 6, no. 10 (2013-10-15), S.2607-2626 |
| Datensatznummer |
250085078
|
| Publikation (Nr.) |
 copernicus.org/amt-6-2607-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| We describe a new algorithm for the retrieval of nitrogen dioxide (NO2)
vertical columns from nadir-viewing satellite instruments. This algorithm
(SP2) is the basis for the Version 2.1 OMI This algorithm (SP2) is the basis for
the Version 2.1 Ozone Monitoring Instrument (OMI) NO2 Standard Product
and features a novel method for separating the stratospheric and
tropospheric columns. NO2 Standard Product and
features a novel method for separating the stratospheric and tropospheric
columns. The approach estimates the stratospheric NO2 directly from
satellite data without using stratospheric chemical transport models or
assuming any global zonal wave pattern. Tropospheric NO2 columns are
retrieved using air mass factors derived from high-resolution radiative
transfer calculations and a monthly climatology of NO2 profile shapes.
We also present details of how uncertainties in the retrieved columns are
estimated. The sensitivity of the retrieval to assumptions made in the
stratosphere–troposphere separation is discussed and shown to be small, in
an absolute sense, for most regions. We compare daily and monthly mean
global OMI NO2 retrievals using the SP2 algorithm with those of the
original Version 1 Standard Product (SP1) and the Dutch DOMINO product. The
SP2 retrievals yield significantly smaller summertime tropospheric columns
than SP1, particularly in polluted regions, and are more consistent with
validation studies. SP2 retrievals are also relatively free of modeling
artifacts and negative tropospheric NO2 values. In a reanalysis of an
INTEX-B validation study, we show that SP2 largely eliminates an
~20% discrepancy that existed between OMI and independent
in situ springtime NO2 SP1 measurements. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|