Title: Satellite Monitoring of Ammonia: A Case Study of the San Joaquin Valley
Authors: CLARISSE LievenSHEPHARD Mark W.DENTENER FranciscusHURTMANS DanielCADY-PEREIRA KarenKARAGULIAN FedericoVAN DAMME MartinCLERBAUX CathyCOHEUR Pierre-Fran¸cois
Citation: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES vol. 115 p. D13302 (1-15)
Publisher: AMER GEOPHYSICAL UNION
Publication Year: 2010
JRC N°: JRC57226
ISSN: 0148-0227
URI: http://www.agu.org/pubs/crossref/2010/2009JD013291.shtml
http://publications.jrc.ec.europa.eu/repository/handle/JRC57226
DOI: 10.1029/2009JD013291
Type: Articles in periodicals and books
Abstract: Atmospheric ammonia has recently been observed with infrared sounders from space. Here we present one year of detailed bi-daily ammonia retrievals above the San Joaquin Valley in California as observed with the IASI spectrometer and a few coincident TES measurements. Several sensitivity issues are discussed related to the sounding of ammonia, in terms of degrees of freedom, averaging kernels, altitude of maximum sensitivity and in relation to thermal contrast and concentration. We also discuss their seasonal dependence and sources of errors. We demonstrate boundary layer sensitivity of infrared sounders when the thermal contrast between the surface and the bottom of the atmosphere is large. We show that for the San Joaquin Valley ammonia can also be sensed during the night, especially when a large negative thermal contrast is amplified by temperature inversion.
JRC Directorate:Sustainable Resources

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