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- Title
Quantification of CH4 emissions from waste disposal sites near the city of Madrid using ground- and space-based observations of COCCON, TROPOMI and IASI.
- Authors
Tu, Qiansi; Hase, Frank; Schneider, Matthias; García, Omaira; Blumenstock, Thomas; Borsdorff, Tobias; Frey, Matthias; Khosrawi, Farahnaz; Lorente, Alba; Alberti, Carlos; Bustos, Juan J.; Butz, André; Carreño, Virgilio; Cuevas, Emilio; Curcoll, Roger; Diekmann, Christopher J.; Dubravica, Darko; Ertl, Benjamin; Estruch, Carme; León-Luis, Sergio Fabián
- Abstract
The objective of this study is to derive methane (CH 4) emissions from three landfills, which are found to be the most significant CH 4 sources in the metropolitan area of Madrid in Spain. We derive CH 4 emissions from the CH 4 enhancements observed by spaceborne and ground-based instruments. We apply satellite-based measurements from the TROPOspheric Monitoring Instrument (TROPOMI) and the Infrared Atmospheric Sounding Interferometer (IASI) together with measurements from the ground-based COllaborative Carbon Column Observing Network (COCCON) instruments. In 2018, a 2-week field campaign for measuring the atmospheric concentrations of greenhouse gases was performed in Madrid in the framework of Monitoring of the Greenhouse Gases Concentrations in Madrid (MEGEI-MAD) project. Five COCCON instruments were deployed at different locations around the Madrid city center, enabling the observation of total column-averaged CH 4 mixing ratios (XCH 4). Considering the prevalent wind regimes, we calculate the wind-assigned XCH 4 anomalies for two opposite wind directions. Pronounced bipolar plumes are found when applying the method to NO 2 , which implies that our method of wind-assigned anomaly is suitable to estimate enhancements of trace gases at the urban level from satellite-based measurements. For quantifying the CH 4 emissions, the wind-assigned plume method is applied to the TROPOMI XCH 4 and to the lower tropospheric CH 4 / dry-air column ratio (TXCH 4) of the combined TROPOMI + IASI product. As CH 4 emission strength we estimate 7.4 × 10 25 ± 6.4 × 10 24 molec. s -1 from the TROPOMI XCH 4 data and 7.1 × 10 25 ± 1.0 × 10 25 molec. s -1 from the TROPOMI + IASI merged TXCH 4 data. We use COCCON observations to estimate the local source strength as an independent method. COCCON observations indicate a weaker CH 4 emission strength of 3.7 × 10 25 molec. s -1 from a local source (the Valdemingómez waste plant) based on observations from a single day. This strength is lower than the one derived from the satellite observations, and it is a plausible result. This is because the analysis of the satellite data refers to a larger area, covering further emission sources in the study region, whereas the signal observed by COCCON is generated by a nearby local source. All emission rates estimated from the different observations are significantly larger than the emission rates provided via the official Spanish Register of Emissions and Pollutant Sources.
- Subjects
MADRID (Spain); WASTE disposal sites; METHANE; TRACE gases; GREENHOUSE gases; TROPOSPHERIC aerosols; LANDFILL gases; METROPOLITAN areas
- Publication
Atmospheric Chemistry & Physics, 2022, Vol 22, Issue 1, p295
- ISSN
1680-7316
- Publication type
Article
- DOI
10.5194/acp-22-295-2022