Constraining the budget of atmospheric carbonyl sulfide using a 3-D chemical transport model

Carbonyl sulfide (OCS) has emerged as a valuable proxy for photosynthetic uptake of carbon dioxide (CO.sub.2) and is known to be important in the formation of aerosols in the stratosphere. However, uncertainties in the global OCS budget remain large. This is mainly due to the following three flux te...

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Bibliographic Details
Published in:Atmospheric chemistry and physics 2023-09, Vol.23 (17), p.10035-10056
Main Authors: Cartwright, Michael P, Pope, Richard J, Harrison, Jeremy J, Chipperfield, Martyn P, Wilson, Chris, Feng, Wuhu, Moore, David P, Suntharalingam, Parvadha
Format: Article
Language:English
Subjects:
Aircraft
Anomalies
Atmospheric chemistry
Biosphere
Budget
Budgets
Carbon dioxide
Carbonyl compounds
Carbonyl sulfide
Carbonyls
Chemical transport
Constraining
Emissions
Estimates
Fluctuations
Fourier transform spectrometers
Fourier transforms
Inversion
Latitude
Modelling
Net losses
Northern Hemisphere
Oxidation
Ozone
Photosynthesis
Primary production
Radiation
Representations
Satellite observation
Satellites
Scaling
Seasonal variation
Simulation
Simulators
Stratosphere
Sulfides
Sulphides
Surface fluxes
Three dimensional models
Trends
Tropical environment
Tropical environments
Troposphere
Uptake
Vegetation
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Summary:Carbonyl sulfide (OCS) has emerged as a valuable proxy for photosynthetic uptake of carbon dioxide (CO.sub.2) and is known to be important in the formation of aerosols in the stratosphere. However, uncertainties in the global OCS budget remain large. This is mainly due to the following three flux terms: vegetation uptake, soil uptake and oceanic emissions. Bottom-up estimates do not yield a closed budget, which is thought to be due to tropical emissions of OCS that are not accounted for. Here we present a simulation of atmospheric OCS over the period 2004-2018 using the TOMCAT 3-D chemical transport model that is aimed at better constraining some terms in the OCS budget. Vegetative uptake of OCS is estimated by scaling gross primary productivity (GPP) output from the Joint UK Land Environment Simulator (JULES) using the leaf relative uptake (LRU) approach. The remaining surface budget terms are taken from available literature flux inventories and adequately scaled to bring the budget into balance.
ISSN:1680-7324
1680-7316
1680-7324
DOI:10.5194/acp-23-10035-2023