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Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data

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Quantifying global dust devil occurrence from meteorological analyses.

Bradley C Jemmett-Smith¹, John H Marsham², Peter Knippertz³

¹Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds Leeds, UK.

Geophysical Research Letters

|December 19, 2015

Summary

This summary is machine-generated.

Dust devils and dusty plumes contribute minimally to global dust, estimated at 3.4%. This study provides the first global hourly climatology of these dust uplift events, revealing realistic diurnal and geographic patterns.

Keywords:

climatology dry convection dust devils dust emission dusty plumes vortices

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Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

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Published on: June 8, 2015

Area of Science:

Atmospheric Science
Geosciences
Environmental Science

Background:

Dust devils and dusty plumes are known mechanisms for lifting fine particles.
Their precise contribution to the global dust budget remains uncertain.

Purpose of the Study:

To create the first global hourly climatology of potential dust devil and dusty plume (PDDP) occurrence.
To estimate the contribution of dry convection to global dust uplift.

Main Methods:

Utilized European Centre for Medium-Range Weather Forecasts (ECMWF) operational analyses.
Applied bulk thermodynamic criteria to determine PDDP occurrence.
Integrated PDDP frequencies with dust source maps and emission values.

Main Results:

Developed a global hourly climatology of PDDP occurrence, showing peak activity from late morning to afternoon.
Estimated the global contribution of PDDP to be 3.4% (uncertainty 0.9-31%).
Found that dry convection accounts for approximately 0.002% of dust-lifting winds.

Conclusions:

The estimated contribution of 3.4% is an order of magnitude lower than previously published estimates.
The study confirms realistic diurnal and geographical distributions for dust devil and dusty plume activity.
Further research is needed on factors controlling PDDP occurrence, source regions, and dust fluxes to reduce uncertainty.