Measurement report: Evolution and distribution of NH3 over Mexico City from ground-based and satellite infrared spectroscopic measurements - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Atmospheric Chemistry and Physics Year : 2022

Measurement report: Evolution and distribution of NH3 over Mexico City from ground-based and satellite infrared spectroscopic measurements

Adolfo Magaldi
  • Function : Author
Kimberly Strong
Camille Viatte
  • Function : Author
  • PersonId : 1023298

Abstract

Ammonia (NH3) is the most abundant alkaline compound in the atmosphere, with consequences for the environment, human health, and radiative forcing. In urban environments, it is known to play a key role in the formation of secondary aerosols through its reactions with nitric and sulfuric acids. However, there are only a few studies about NH3 in Mexico City. In this work, atmospheric NH3 was measured over Mexico City be- tween 2012 and 2020 by means of ground-based solar absorption spectroscopy using Fourier transform infrared (FTIR) spectrometers at two sites (urban and remote). Total columns of NH3 were retrieved from the FTIR spec- tra and compared with data obtained from the Infrared Atmospheric Sounding Interferometer (IASI) satellite instrument. The diurnal variability of NH3 differs between the two FTIR stations and is strongly influenced by the urban sources. Most of the NH3 measured at the urban station is from local sources, while the NH3 observed at the remote site is most likely transported from the city and surrounding areas. The evolution of the boundary layer and the temperature play a significant role in the recorded seasonal and diurnal patterns of NH3. Although the vertical columns of NH3 are much larger at the urban station, the observed annual cycles are similar for both stations, with the largest values in the warm months, such as April and May. The IASI measurements under- estimate the FTIR NH3 total columns by an average of 32.2 ± 27.5 % but exhibit similar temporal variability. The NH3 spatial distribution from IASI shows the largest columns in the northeast part of the city. In general, NH3 total columns over Mexico City measured at the FTIR stations exhibited an average annual increase of 92 ± 3.9 × 1013 molecules cm−2 yr−1 (urban, from 2012 to 2019) and 8.4 ± 1.4 × 1013 molecules cm−2 yr−1 (re- mote, from 2012 to 2020), while IASI data within 20 km of the urban station exhibited an average annual increase of 38 ± 7.6 × 1013 molecules cm−2 yr−1 from 2008 to 2018.
Fichier principal
Vignette du fichier
acp-22-14119-2022.pdf (6.03 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

insu-03661656 , version 1 (07-05-2022)
insu-03661656 , version 2 (04-11-2022)

Licence

Identifiers

Cite

Beatriz Herrera, Alejandro Bezanilla, Thomas Blumenstock, Enrico Dammers, Frank Hase, et al.. Measurement report: Evolution and distribution of NH3 over Mexico City from ground-based and satellite infrared spectroscopic measurements. Atmospheric Chemistry and Physics, 2022, 22 (21), pp.14119-14132. ⟨10.5194/acp-22-14119-2022⟩. ⟨insu-03661656v2⟩
144 View
30 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More