Preprints
https://doi.org/10.5194/acp-2022-703
https://doi.org/10.5194/acp-2022-703
 
15 Nov 2022
15 Nov 2022
Status: this preprint is currently under review for the journal ACP.

Measurement report: Assessment of Asian emissions of ethane, propane, carbon monoxide, and NOx based on observations from the island of Hateruma

Adedayo Rasak Adedeji1, Stephen Joseph Andrews1, Matthew Joseph Rowlinson1,2, Mathew Joseph Evans1,2, Alastair Charles Lewis1,2, Shigeru Hashimoto3, Hitoshi Mukai3, Hiroshi Tanimoto3, Yasunori Tohjima3, and Takuya Saito3 Adedayo Rasak Adedeji et al.
  • 1Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK
  • 2National Centre for Atmospheric Science, Department of Chemistry, University of York, York, UK
  • 3National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan

Abstract. The island of Hateruma is the southernmost inhabited island of Japan. Here we interpret observations of carbon monoxide (CO), ethane (C2H6), propane (C3H8), nitrogen oxides (NOx and NOy) and ozone (O3) made from the island in 2018 with the GEOS-Chem atmospheric chemistry transport model. We simulated the concentrations of these species within a nested grid centered over the site, with a model resolution of 0.5°×0.625°. We use the Community Emissions Data System (CEDS) emissions dataset for anthropogenic emissions and add a geological source of C2H6 and C3H8. The model captured the seasonality of primary pollutants (CO, C2H6, C3H8) at the site - high concentrations in the winter months when oxidation rates are low and flow is from the north, and low concentrations in the summer months when oxidation rates are higher and flow is from the south. It also simulates many of the synoptic scale events with Pearson’s correlation coefficients (r) of 0.74, 0.88 and 0.89 for CO, C2H6 and C3H8, respectively. Concentrations of CO are well simulated by the model (with a gradient of best fit between model and measurements of 0.91) but simulated concentrations of C2H6 and C3H8 are significantly lower than the observations (gradients of best fit between model and measurement of 0.57 and 0.41, respectively), most noticeably in the winter months. Simulated NOx concentrations were underestimated but NOy appear to be overestimated. The concentration of O3 is moderately well simulated (gradient of best fit line of 0.76, with an r of 0.87) but there is a tendency to underestimate concentrations in the winter months. By switching off the model’s biomass burning emissions we show that during winter biomass burning has limited influence on the concentration of compounds in the winter but can represent a sizeable fraction in the summer. We also show that increasing the anthropogenic emissions of C2H6 and C3H8 in Asia by factors of 2.22 and 3.17, respectively, significantly increases the model’s ability to simulate these species in the winter months, consistent with previous studies.

Adedayo Rasak Adedeji et al.

Status: open (until 08 Jan 2023)

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Adedayo Rasak Adedeji et al.

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Assessment of Asian emissions of ethane, propane, carbon monoxide, and NOx based on observations from the island of Hateruma Adedayo R. Adedeji, Stephen J. Andrews, Matthew J. Rowlinson, Mathew J. Evans, Alastair C. Lewis, Shigeru Hashimoto, Hitoshi Mukai, Hiroshi Tanimoto, Yasunori Tohjima, and Takuya Saito https://drive.google.com/drive/folders/1SRQ6eqqBrKN3xBI-4_-SMDGpdNDI0qPj?usp=sharing

Adedayo Rasak Adedeji et al.

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Short summary
We interpret observations of CO, C2H6, C3H8, NOx, NOy and O3 made from the Hateruma island in 2018 with the GEOS-Chem model. The model captured many of the synoptic scale events and seasonality of most pollutants at the site but underestimates C2H6 and C3H8 during the winter. These underestimates are unlikely to be reconciled by increases in biomass burning emissions, but could be reconciled by increasing the Asian anthropogenic source of C2H6 and C3H8 by factors around 2 and 3, respectively.
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