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| Titel |
Global lightning NOx production estimated by an assimilation of multiple satellite data sets |
| VerfasserIn |
K. Miyazaki, H. J. Eskes, K. Sudo, C. Zhang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 7 ; Nr. 14, no. 7 (2014-04-02), S.3277-3305 |
| Datensatznummer |
250118559
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| Publikation (Nr.) |
 copernicus.org/acp-14-3277-2014.pdf |
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| Zusammenfassung |
| The global source of lightning-produced NOx (LNOx) is
estimated by assimilating observations of NO2, O3,
HNO3, and CO measured by multiple satellite measurements into
a chemical transport model. Included are observations from the Ozone
Monitoring Instrument (OMI), Microwave Limb Sounder (MLS), Tropospheric
Emission Spectrometer (TES), and Measurements of Pollution in the Troposphere
(MOPITT) instruments. The assimilation of multiple chemical data sets with
different vertical sensitivity profiles provides comprehensive constraints on
the global LNOx source while improving the representations of the
entire chemical system affecting atmospheric NOx, including surface
emissions and inflows from the stratosphere. The annual global LNOx
source amount and NO production efficiency are estimated at
6.3 Tg N yr−1 and 310 mol NO flash−1, respectively.
Sensitivity studies with perturbed satellite data sets, model and data
assimilation settings lead to an error estimate of about
1.4 Tg N yr−1 on this global LNOx source. These
estimates are significantly different from those estimated from a parameter
inversion that optimizes only the LNOx source from NO2
observations alone, which may lead to an overestimate of the source
adjustment. The total LNOx source is predominantly corrected by the
assimilation of OMI NO2 observations, while TES and MLS observations
add important constraints on the vertical source profile. The results
indicate that the widely used lightning parameterization based on the C-shape
assumption underestimates the source in the upper troposphere and
overestimates the peak source height by up to about 1 km over land
and the tropical western Pacific. Adjustments are larger over ocean than over
land, suggesting that the cloud height dependence is too weak over the ocean
in the Price and Rind (1992) approach. The significantly improved agreement
between the analyzed ozone fields and independent observations gives
confidence in the performance of the LNOx source estimation. |
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