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| Titel |
TES ammonia retrieval strategy and global observations of the spatial and seasonal variability of ammonia |
| VerfasserIn |
M. W. Shephard, K. E. Cady-Pereira, M. Luo, D. K. Henze, R. W. Pinder, J. T. Walker, C. P. Rinsland, J. O. Bash, L. Zhu, V. H. Payne, L. Clarisse |
| 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 ; 11, no. 20 ; Nr. 11, no. 20 (2011-10-31), S.10743-10763 |
| Datensatznummer |
250010156
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| Publikation (Nr.) |
 copernicus.org/acp-11-10743-2011.pdf |
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| Zusammenfassung |
| Presently only limited sets of tropospheric ammonia
(NH3) measurements in the Earth's atmosphere have been reported from
satellite and surface station measurements, despite the well-documented
negative impact of NH3 on the environment and human health. Presented
here is a detailed description of the satellite retrieval strategy and
analysis for the Tropospheric Emission Spectrometer (TES) using simulations
and measurements. These results show that: (i) the level of detectability
for a representative boundary layer TES NH3 mixing ratio value is ~0.4 ppbv, which typically corresponds to a profile that contains a maximum
level value of ~1 ppbv; (ii) TES NH3 retrievals generally provide at most
one degree of freedom for signal (DOFS), with peak sensitivity between 700
and 900 mbar; (iii) TES NH3 retrievals show significant spatial and
seasonal variability of NH3 globally; (iv) initial comparisons of TES
observations with GEOS-CHEM estimates show TES values being higher overall.
Important differences and similarities between modeled and observed seasonal
and spatial trends are noted, with discrepancies indicating areas where the
timing and magnitude of modeled NH3 emissions from agricultural
sources, and to lesser extent biomass burning sources, need further study. |
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