Revised mineral dust emissions in the atmospheric chemistry–climate model EMAC (MESSy 2.52 DU_Astitha1 KKDU2017 patch)

To improve the aeolian dust budget calculations with the global ECHAM/MESSy atmospheric chemistry–climate model (EMAC), which combines the Modular Earth Submodel System (MESSy) with the ECMWF/Hamburg (ECHAM) climate model developed at the Max Planck Institute for Meteorology in Hamburg based on a we...

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Bibliographic Details
Published in:Geoscientific Model Development 2018-03, Vol.11 (3), p.989-1008
Main Authors: Klingmüller, Klaus, Metzger, Swen, Abdelkader, Mohamed, Karydis, Vlassis A, Stenchikov, Georgiy L, Pozzer, Andrea, Lelieveld, Jos
Format: Article
Language:English
Subjects:
Aerosol optical depth
Aerosol Robotic Network
Aerosols
Arid regions
Arid zones
Atmospheric chemistry
Atmospheric models
Atmospheric particulates
Atmospheric sounding
Clay
Clay minerals
Climate
Climate models
Computer simulation
Data
Dust
Dust storms
Earth
Emission
Emissions
Eolian dust
Imaging techniques
Infrared interferometers
Land cover
Meteorology
MODIS
Modular systems
Optical analysis
Organic chemistry
Prediction models
Resolution
Semi arid areas
Semiarid lands
Spatial data
Spatial discrimination
Spatial resolution
Spectroradiometers
Time dependence
Topography (geology)
Vegetation
Wavelength
Weather forecasting
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Summary:To improve the aeolian dust budget calculations with the global ECHAM/MESSy atmospheric chemistry–climate model (EMAC), which combines the Modular Earth Submodel System (MESSy) with the ECMWF/Hamburg (ECHAM) climate model developed at the Max Planck Institute for Meteorology in Hamburg based on a weather prediction model of the European Centre for Medium-Range Weather Forecasts (ECMWF), we have implemented new input data and updates of the emission scheme. The data set comprises land cover classification, vegetation, clay fraction and topography. It is based on up-to-date observations, which are crucial to account for the rapid changes of deserts and semi-arid regions in recent decades. The new Moderate Resolution Imaging Spectroradiometer (MODIS)-based land cover and vegetation data are time dependent, and the effect of long-term trends and variability of the relevant parameters is therefore considered by the emission scheme. All input data have a spatial resolution of at least 0.1∘ compared to 1∘ in the previous version, equipping the model for high-resolution simulations. We validate the updates by comparing the aerosol optical depth (AOD) at 550 nm wavelength from a 1-year simulation at T106 (about 1.1∘) resolution with Aerosol Robotic Network (AERONET) and MODIS observations, the 10 µm dust AOD (DAOD) with Infrared Atmospheric Sounding Interferometer (IASI) retrievals, and dust concentration and deposition results with observations from the Aerosol Comparisons between Observations and Models (AeroCom) dust benchmark data set. The update significantly improves agreement with the observations and is therefore recommended to be used in future simulations.
ISSN:1991-9603
1991-959X
1991-962X
1991-9603
1991-962X
DOI:10.5194/gmd-11-989-2018