Retrieving the global distribution of the threshold of wind erosion from satellite data and implementing it into the geophysical fluid dynamics laboratory land–atmosphere model (GFDL AM4.0/LM4.0)
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Cita com:
hdl:2117/181248
Tipus de documentArticle
Data publicació2020-01-03
EditorCopernicus Publications
Condicions d'accésAccés obert
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continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
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Reconeixement-NoComercial-SenseObraDerivada 4.0 Internacional
Abstract
Dust emission is initiated when surface wind velocities exceed the threshold of wind erosion. Many dust models used constant threshold values globally. Here we use satellite products to characterize the frequency of dust events and land surface properties. By matching this frequency derivedfrom Moderate Resolution Imaging Spectroradiometer (MODIS) Deep Blue aerosol products with surface winds, we are able to retrieve a climatological monthly global distribution of the wind erosion threshold (Vthreshold) over dry and sparsely vegetated surfaces. This monthly two-dimensional threshold velocity is then implemented into the Geophysical Fluid Dynamics Laboratory coupled land–atmosphere model (AM4.0/LM4.0). It is found that the climatology of dust optical depth (DOD) and total aerosol optical depth, surface
PM10 dust concentrations, and the seasonal cycle of DOD are better captured over the “dust belt” (i.e., northern Africa
and the Middle East) by simulations with the new wind erosion threshold than those using the default globally constant
threshold. The most significant improvement is the frequency distribution of dust events, which is generally ignored in model evaluation. By using monthly rather than annual mean Vthreshold, all comparisons with observations are further improved. The monthly global threshold of wind erosion can be retrieved under different spatial resolutions to match the
resolution of dust models and thus can help improve the simulations of dust climatology and seasonal cycles as well as
dust forecasting.
CitacióPu, B. [et al.]. Retrieving the global distribution of the threshold of wind erosion from satellite data and implementing it into the geophysical fluid dynamics laboratory land–atmosphere model (GFDL AM4.0/LM4.0). "Atmospheric Chemistry and Physics", 3 Gener 2020, vol. 20, núm. 1, p. 55-81.
Versió de l'editorhttps://www.atmos-chem-phys.net/20/55/2020/
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acp-20-55-2020.pdf | 16,78Mb | Visualitza/Obre |