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Unrealistically pristine air in the Arctic produced by current global scale models
Yousuke Sato1, Hiroaki Miura2, Hisashi Yashiro1
1RIKEN Advanced Institute for Computational Science, Kobe, Japan.
Scientific Reports
|May 26, 2016
Summary
Higher resolution global models accurately simulate Arctic black carbon aerosol (BCA) levels. This research shows finer grid resolutions are crucial for understanding BCA
Area of Science:
- Atmospheric Science
- Climate Science
- Environmental Science
Background:
- Black carbon aerosol (BCA) significantly impacts Arctic climate via radiation processes.
- Current global models underestimate Arctic BCA levels across seasons.
- Accurate BCA quantification is vital for climate change projections.
Purpose of the Study:
- To investigate the impact of grid resolution on simulating Arctic BCA.
- To determine if higher resolution models reduce BCA underestimation.
- To assess the necessity of kilometre-scale resolution for Arctic pollutant transport.
Main Methods:
- Global aerosol transport simulation.
- Comparison of coarse (56-km) and high (3.5-km) grid resolutions.
- Analysis of BCA mass loading and poleward flux.
Main Results:
- High resolution (3.5-km) significantly reduced BCA underestimation in the Arctic.
- BCA mass loading was 4.2 times higher with 3.5-km resolution compared to coarse resolution.
- Grid convergence was not achieved even at 3.5-km resolution.
Conclusions:
- Kilometre-scale or finer grid resolution is essential for accurate Arctic BCA simulation.
- Improved representation of weather systems at higher resolutions enhances BCA simulation.
- Further refinement in model resolution is needed for precise Arctic pollutant distribution.
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