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Methane and nitrous oxide from ground-based FTIR at Addis Ababa: Observations, error analysis, and comparison with satellite data

Yirdaw Berhe, T.; Mengistu Tsidu, G.; Blumenstock, Thomas; Hase, Frank; Stiller, Gabriele P.

Abstract:
A ground-based, high-spectral-resolution Fourier transform infrared (FTIR) spectrometer has been operational in Addis Ababa, Ethiopia (9.01∘ N latitude, 38.76∘ E longitude; 2443 m altitude above sea level), since May 2009 to obtain information on column abundances and profiles of various constituents in the atmosphere. Vertical profile and column abundances of methane and nitrous oxide are derived from solar absorption measurements taken by FTIR for a period that covers May 2009 to March 2013 using the retrieval code PROFFIT (V9.5). A detailed error analysis of CH$_{4}$ and N$_{2}$O retrieval are performed. Averaging kernels of the target gases shows that the major contribution to the retrieved information comes from the measurement. Thus, average degrees of freedom for signals are found to be 2.1 and 3.4, from the retrieval of CH$_{4}$ and N$_{2}$O for the total observed FTIR spectra. Methane and nitrous oxide volume mixing ratio (VMR) profiles and column amounts retrieved from FTIR spectra are compared with data from the reduced spectral resolution Institute of Meteorology and Climate Research/Instituto de Astrofísica de Andalucía (IMK/IAA) MIPAS (Version V5R_CH4_224 and V5R_N2O_224), the Microwave Limb Sounder (MLS) (MLS v3.3 of N$_{2}$O and CH$_{4}$ derived from MLS v3.3 products of CO, N$_{2}$O, and H$_{2}$O), and the Atmospheric Infrared Sounder (AIRS) sensors on board satellites. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000123390
Veröffentlicht am 10.09.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1867-1381, 1867-8548
KITopen-ID: 1000123390
HGF-Programm 12.03.01 (POF III, LK 01) Long term observations of tropospheric
Erschienen in Atmospheric measurement techniques
Verlag Copernicus Publications
Band 13
Heft 7
Seiten 4079-4096
Nachgewiesen in Web of Science
Dimensions
Scopus
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