Top-down CO emissions based on IASI observations and hemispheric constraints on OH levels - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2018

Top-down CO emissions based on IASI observations and hemispheric constraints on OH levels

(1) , (1) , (1) , (2) , (3) , (3) , (2, 3) , (4)
1
2
3
4

Abstract

Assessments of carbon monoxide emissions through inverse modeling are dependent on the modeled abundance of the hydroxyl radical (OH) which controls both the primary sink of CO and its photochemical source through hydrocarbon oxidation. However, most chemistry-transport models (CTMs) fall short of reproducing constraints on hemispherically-averaged OH levels derived from methylchloroform (MCF) observations. Here we construct five different OH fields compatible with MCF-based analyses, and we prescribe those fields in a global CTM to infer CO fluxes based on IASI CO columns. Each OH field leads to a different set of optimized emissions. Comparisons with independent data (surface, ground-based remotely-sensed, aircraft) indicate that the inversion adopting the lowest average OH level in the Northern Hemisphere (7.8 × 105molec. cm−3, ca. 18% lower than the best estimate based on MCF measurements) provides the best overall agreement with all tested observation datasets.
Fichier principal
Vignette du fichier
M-ller_et_al-2018-Geophysical_Research_Letters.pdf (7.16 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

insu-01696520 , version 1 (26-04-2019)

Identifiers

Cite

Jean-François Müller, Trissevgeni Stavrakou, Maite Bauwens, Maya George, Daniel Hurtmans, et al.. Top-down CO emissions based on IASI observations and hemispheric constraints on OH levels. Geophysical Research Letters, 2018, 45 (3), pp.1621-1629. ⟨10.1002/2017GL076697⟩. ⟨insu-01696520⟩
155 View
62 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More