CO surface emissions from solar absorption IR spectroscopy
Abstract
Total column amounts of carbon monoxide (CO) are measured at the UNAM campus in Mexico City (19,33°N, 99.18°W, 2260 m asl) since October 2007. The infrared spectra are recorded with an FTIR spectrometer at 0.5 cm-1 resolution (Bruker Opag 22) and since March 2010 at 0.1 cm-1 resolution (Bruker Vertex 80). The CO column density is retrieved from the IR spectra using the SFIT2 retrieval code. Surface CO concentrations around UNAM are taken as the average of 5 nearest stations from the local monitoring network and the mixing layer height is continuously measured with a Lidar at the measurement site. It is shown in this contribution, that from these parameters and the known wind fields it is possible to determine emissions from the measured CO-column growth rates. The obtained growth rates, which are limited to optimised time intervals and filtered to avoid contributions from horizontal transport, represent a top-down approach for inferring surface emissions. These are compared with model results and inventories after a proper extrapolation to the entire metropolitan area. The potential to use this methodology for CO2, CH4 and other greenhouse gases will be discussed.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2010
- Bibcode:
- 2010AGUFM.A13F0285G
- Keywords:
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- 0322 ATMOSPHERIC COMPOSITION AND STRUCTURE / Constituent sources and sinks;
- 0345 ATMOSPHERIC COMPOSITION AND STRUCTURE / Pollution: urban and regional;
- 0394 ATMOSPHERIC COMPOSITION AND STRUCTURE / Instruments and techniques;
- 0480 BIOGEOSCIENCES / Remote sensing