Reducing resolution dependency of dust emission modeling using Albedo‐Based wind friction

Chappell, Adrian ORCID: https://orcid.org/0000-0002-0694-7348, Hennen, Mark, Schepanski, Kerstin, Dhital, Saroj and Tong, Daniel 2024. Reducing resolution dependency of dust emission modeling using Albedo‐Based wind friction. Geophysical Research Letters 51 (5) , e2023GL106540. 10.1029/2023gl106540

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Abstract

Numerical simulations of dust emission processes are essential for dust cycle modeling and dust‐atmosphere interactions. Models have coarse spatial resolutions which, without tackling sub‐grid scale heterogeneity, bias finely resolved dust emission. Soil surface wind friction velocity ( u s *) drives dust emission non‐linearly with increasing model resolution, due mainly to thresholds of sediment entrainment. Albedo is area‐integrated, scales linearly with resolution, is related to u s * and hence represents its sub‐grid scale heterogeneity. Calibrated albedo‐based global dust emission estimates decreased by only 2 Tg y−1 (10.5%) upscaled from 0.5 to 111 km, largely independent of resolution. Without adjusting wind fields, this scaling uncertainty is within recent estimates of global dust emission model uncertainty (±14.9 Tg y−1). This intrinsic scaling capability of the albedo‐based approach offers considerable potential to reduce resolution dependency of dust cycle modeling and improve the representation of local dust emission in Earth system models and operational air quality forecasting.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by/4.0/
Publisher:	Wiley Open Access
ISSN:	0094-8276
Date of First Compliant Deposit:	4 March 2024
Date of Acceptance:	11 February 2024
Last Modified:	04 Mar 2024 10:45
URI:	https://orca.cardiff.ac.uk/id/eprint/166809

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